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Orban OPTIMOD 5750 Operating Manual

Fm/hd/dab+ digital audio processor
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OPERATING MANUAL
OPTIMOD
5750
FM/HD/DAB+ Digital Audio Processor

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Summary of Contents for Orban OPTIMOD 5750

  • Page 1 OPERATING MANUAL OPTIMOD 5750 FM/HD/DAB+ Digital Audio Processor...
  • Page 2 OPTIMOD 5750 Description: M/HD/DAB+ Digital Audio Processor OPTIMOD 5750, Stereo Encoder, Digital I/O, Digital MPX I/O, Protection Structure, Two-Band Structure, Multi-Band Structure, HD Radio™ / Digital Radio/Netcast Processing, Digital Composite Output, Dante AES67-Compliant Audio-Over-IP, µMPX streaming, Dual-Redundant Power Supply 90 V to 240V (automatically selected), switchable to 50µs or 75µs.
  • Page 3 © Copyright 2023 Orban Labs Inc. Orban® and OPTIMOD® are trademarks of Orban Labs Inc.. Published November 2023. This manual © copyright Orban Labs Inc. This manual may be freely printed out and distributed if this copyright notice is not removed.
  • Page 4 O P T I M O D - 5 7 5 0 D I G I T A L A U D I O P R O C E S S O R...
  • Page 5 IMPORTANT SAFETY INSTRUCTIONS O P T I M O D - 5 9 5 0 D I G I T A L A U D I O P R O C E S S O R All the safety and operating instructions should be read before the appliance is operated. Retain Instructions: The safety and operation instructions should be retained for future reference.
  • Page 6 (2) Check the other sections of the Manual (consult the Table of Contents and Index) to see if there might be some suggestions regarding your problem. (3) After reading the section on Factory Assistance, you may call Orban Customer Service for advice during normal business hours. The number is +1 856.719.9900.
  • Page 7 This manual was published December 2023. © Copyright Orban. This document may be freely printed and distributed by Orban’s customers, but its text may not be incorporated into derivative works. Orban Labs Inc., 7209 Browning Road, Pennsauken NJ 08110 USA Phone: +1 856.719.9900...

  • Page 8: Table Of Contents

    O P T I M O D - 5 7 5 0 D I G I T A L A U D I O P R O C E S S O R Table of Contents Section 1: Introduction ........................1-1 Input/output Configuration ............................
  • Page 9 O P T I M O D - 5 9 5 0 D I G I T A L A U D I O P R O C E S S O R µMPX Composite over IP (optional) ........................2-18 Wordclock/10 MHz Sync Reference ........................
  • Page 10 O P T I M O D - 5 7 5 0 D I G I T A L A U D I O P R O C E S S O R SPEECH MODE ................................. 3-53 BANDMIX ................................. 3-54 DISTORTION ................................
  • Page 11 O P T I M O D - 5 9 5 0 D I G I T A L A U D I O P R O C E S S O R Tally Outputs................................7-18 Power ..................................7-18 Environmental ................................. 7-18 Warranty ..................................

  • Page 12: Section 1: Introduction

    Section 1: Introduction The OPTIMOD 5750 is a 1 RU (rack unit) broadcast audio processor designed for use with analog FM broadcasts as well as digital broadcasts or streaming. It has a consistent 2 band AGC (Automatic Gain Control) followed by a 5 band processor and state of the art peak control.

  • Page 13: Input/Output Configuration

    Introduction • The FM and HD/DAB+ processed signals can be monitored remotely via IP, allowing for processing adjustments where a clean over-the-air signal isn’t available. • Optional µMPX (micro MPX) allows transmission of DMPX over IP. • High resolution front panel touch screen for ease of navigation. Input/output Configuration THE OPTIMOD-5750 will simultaneously accommodate: •...

  • Page 14: Analog Left/Right Input/Output

    Orban 5750 Technical Manual Introduction Both analog and digital outputs are active continuously. Level control of the AES3 input is via software control through the INPUT/OUTPUT screens. In addition, an AES11 sync input can accommodate house sync. It will lock the 5750’s two AES3 outputs to this sync even if the digital input is asynchronous to house sync.

  • Page 15: Digitized Subcarrier Inputs

    Introduction Subcarrier inputs sum into the composite baseband outputs before the digitally controlled composite attenuators. The sensitivity of the both SCA inputs are variable from 220 mV p-p to >10 V p-p to produce 10% injection. Internal PC-board-mounted trim pots determine the sensitivity. The correct peak level of the stereo program applied to the stereo encoder sometimes depends on the number of subcarriers in use.

  • Page 16: Warranty, User Feedback

    Simply take or ship your Orban products prepaid to our service department. Be sure to include a copy of your sales slip as proof of purchase date. We will not repair transit damage under the no-charge terms of this warranty. Orban will pay return shipping.

  • Page 18: Section 2: Installation

    1 OPTIMOD 5750 Audio Processor If any of these items are damaged or missing, please contact your dealer or Orban as soon as possible. Save all packing materials! If you should ever have to ship the 5750 (e.g., for servicing), it is best to ship it in the original carton with its packing materials because both the carton and packing material have been carefully designed to protect the unit.

  • Page 19: Surge Protection

    Installation Surge Protection Always place surge protection circuits as close as possible to the 5750. AC power line surges should be handled in a way that keeps instantaneous potential differences between the power line hot, neutral, AC grounding conductor, the station ground and the processor chassis as low as possible. Likewise, measures should also be taken to keep the instantaneous potential difference between the audio cable shields and the processor chassis as low as possible (this applies to all audio equipment, not just the 5750), particularly when the equipment is located within the electrically hostile environment of a station’s transmitter facility.
  • Page 20 Orban 5750 Technical Manual Installation If an uncompressed left/right digital link is available to the transmitter, this is also an excellent means of transmission, although it will not pass the effects of the 5750’s composite processor (if you are using it). However, if the digital link employs lossy compression, it will degrade peak control.

  • Page 21: Studio-Transmitter Link

    Installation Studio-Transmitter Link Transmission from Studio to Transmitter: There are five types of studio-transmitter links (STLs) in common use in broadcast service: uncompressed digital, digital with lossy compression (like MPEG, Dolby®, or APT-x®), microwave, analog landline (telephone / post line), and audio subcarrier on a video microwave STL. STLs are used in three fundamentally different ways.
  • Page 22 STL is good enough to pass unprocessed audio. The signal- to-noise ratio of the STL can be used optimally if an Orban OPTIMOD-PC 1101 or OPTIMOD 6300 protect the link from overload.

  • Page 23: Stl And Exciter Overshoot

    Nevertheless, in a dual-microwave system, the 5750 is usually located at the main FM transmitter and is driven by the microwave receivers. One of Orban’s studio level control systems, such as the OPTIMOD 6300, protects the microwave transmitters at the studio from overload. These units also perform the gain riding function ordinarily executed by the AGC section of the 5750’s processing and optimize the signal-to-noise ratio obtainable from the...
  • Page 24 Ultra-low latency processing uses a separate, parallel processing structure and is invoked by recalling any “UL” preset. This structure operates simultaneously with other code, so, unlike the similar structure in Orban’s OPTIMOD 8300, it does not require a code re-load and does not cause a gap in programming.

  • Page 25: Pc Control

    GPI remote control inputs, cutting off the low-delay audio to the talent’s phones when an audio or carrier failure occurs. PC Control The OPTIMOD 5750 can be controlled via a web browser pointed at the address assigned to it. All system controls are accessible there. Racking the 5750 The 5750 is designed to fit in a standard 19’...

  • Page 26: Cable

    5750. Cable Orban recommends using two-conductor foil-shielded cable (such as Belden 8451 or equivalent) for the audio input and output connections because signal current flows through the two conductors only. The shield does not carry signal and is used only for shielding.

  • Page 27: Analog Audio Output

    2-10 Installation Analog Audio Output • Electronically balanced and floating outputs simulate a true transformer output. The source impedance is 50. The output is capable of driving loads of 600 or higher; the 100% modulation level is adjustable with the AO 100% control over a –6dBu to +24dBu range.

  • Page 28: Dante Aes67

    2-11 Orban 5750 Technical Manual Installation • The digital input clip level is fixed at 0 dB relative to the maximum digital word. The maximum digital input will make the 5750 input meters display 0dB. The reference level is adjustable using the DI REF control.
  • Page 29 2-12 Installation Dante hardware devices, like your OPTIMOD, are set to obtain their IP address automatically from the network. They will either: • Automatically assign themselves an address in the range 169.254.*.* (172.31.*.* for the secondary network if present), or •...
  • Page 30 2-13 Orban 5750 Technical Manual Installation Figure 2-2: A SWITCHED setup with a DHCP-sourced IP address: Figure 2-3: A Dante Controller reports the 5750 network status when a 5750 has been configured and connected for dual-redundant networks.
  • Page 31 2-14 Installation In the Dante network, route audio to and from the 5750. A Dante device has a number of channels associated with it. These are either transmit (TX) or receive (RX) channels. Your OPTIMOD provides two Dante stereo transmit channels and two stereo receive channels. Receive channels and devices are listed down the left side of the grid in the Dante Controller software.
  • Page 32 2-15 Orban 5750 Technical Manual Installation • Channel 4 = DANTE 2 RIGHT OUTPUT You can set the sample rate of the OPTIMOD’s Dante output via the DEVICE CONFIG tab in the Dante Controller software. You must set the sample rate to match the rate of the Dante network device receiving the OPTIMOD’s output.

  • Page 33: Dante Firmware Updates

    • Restore Dante-enabled modules in failsafe mode. The firmware itself is not on Orban’s FTP. Because your OPTIMOD’s software was tested only with certain releases of Dante firmware, we suggest contacting Orban Customer Service before updating. If you wish to update your 5750 with the Broadway Ultimo chip to support AES67, you may use Ultimo v4.1.2.5 firmware.
  • Page 34 2-17 Orban 5750 Technical Manual Installation Each output’s level is independently adjustable from –12 dBu to +16.0 dBu. The output impedance of composite 1 output and composite 2 output can be set to 0 or 75 via jumpers J7 and J8 respectively (located on the Composite/SCA daughterboard).

  • Page 35: Dmpx

    2-18 Installation As shipped from the factory, the second SCA connector emits a stereo pilot tone reference for RDS or RBDS subcarrier generators. If you wish to reconfigure it to accept an SCA signal, move the link on jumper J6 (on the Composite/SCA daughter- board) from pins 3 and 4 to pins 1 and 2.

  • Page 36: Audio Grounding

    When the 5750’s stereo encoder is driving an unbalanced exciter input, you may encounter a ground loop. (Some older exciters have unbalanced inputs.) Unlike some older Orban FM processors, the 5750 does not have a ground lift switch. If you cannot reconfigure your grounding scheme to eliminate such a loop, you can balance...

  • Page 37: Optically Isolated Remote Control Connections

    2-20 Installation • In high RF fields, the system is usually grounded through the equipment rack in which the 5750 is mounted. The rack should be connected to a solid earth ground by a wide copper strap. Wire is completely ineffective at VHF because of the wire’s self-inductance.
  • Page 38 2-21 Orban 5750 Technical Manual Installation There are two tally outputs, which are NPN open-collector and operate with respect to pin 1 (common). Therefore, the voltage applied to the load (such as a relay or optoisolator) must be positive. You can use the 12 VDC source on pin 25 to drive the high side of the load, taking into account the fact that the voltage on pin 25 is current limited by a 310Ω...

  • Page 39: The 5750 Front Panel

    • System (SYS): Under normal conditions, this will not be lit. If it is lit, there is some issue with the processor which should be addressed with Orban technical support. Please do not disassemble the unit. • Temperature (TEMP): When illuminated, there is an overheating issue with the processor. You should attempt to remedy the temperature issue in the room, or in the rack where the 5750 is located.
  • Page 40 2-23 Orban 5750 Technical Manual Installation B) FM + Delay C) Monitor D) HD E) HD + Delay F) Analog In G) Digital In 1 H) Digital in 2 AoIP In 1 AoIP In 2 K) Stream In Use the up and down buttons to scroll thru the options and touch the source you would like to monitor.

  • Page 41: Connecting To The 5750 Via Web Interface

    2-24 Installation • Supply Voltages System status and any failures SETUP There are four options with submenus under setup. • DISPLAY BACKLIGHT – Sets the brightness of the display. • NETWORK SETTINGS – Allows you to set the IP, Subnet and Gateway addresses for the processor (or choose DHCP), and allows you to set port forwarding under REMOTE SETTINGS.
  • Page 42 2-25 Orban 5750 Technical Manual Installation The 5750 has a default USER NAME and PASSWORD that you will be prompted to input upon connection to continue. They are: USERNAME: ADMIN (all caps) PASSWORD: 1234 To change the default username and password: From the main panel, select SETUP then ACCESS CONTROL.

  • Page 44: Section 3: Operation

    Orban 5750 Technical Manual Operation Section 3: Operation Introduction to Processing Some Audio Processing Concepts Reducing the peak-to-average ratio of the audio increases loudness. If peaks are reduced, the average level can be increased within the permitted modulation limits. The effectiveness with which this can be accomplished without introducing objectionable side effects (such as pumping or intermodulation distortion) is the single best measure of audio processing effectiveness.
  • Page 45 In FM processing, there is a direct trade-off between loudness, brightness, and distortion. You can improve one only at the expense of one or both of the others. Thanks to Orban’s psychoacoustically optimized designs, this is less true of Orban processors than of others.

  • Page 46: Fundamental Requirements: High-Quality Source Material And Accurate Monitoring

    FM pre-emphasis / de-emphasis process. Although the 5750 loses less high frequency energy than many previous Orban processors (due to improvements in high frequency limiting and clipping technology), it is nevertheless no match for CDs that are mastered so bright that they will curl the vinyl off car dashboards. We hope that the record industry will come to its senses when it hears the consequences of these practices on the air.

  • Page 47: About The 5750'S Signal Processing Features

    Operation About the 5750’s Signal Processing Features Dual-Mono Architecture The 5750 implements full dual-mono architecture in both the AGC and the multiband compressor sections. You can couple each band in both the AGC and multiband compressors to a variable extent—anywhere from perfect stereo coupling to completely uncoupled operation.
  • Page 48 A defeatable 30 Hz 18 dB/octave highpass filter and a defeatable phase rotator complete the input-conditioning block. These have both been features in Orban FM processors for many years. Most users will defeat the 30 Hz filter and leave the phase rotator in-circuit, although the choice is always yours.
  • Page 49 Figure 3-2 shows the effect of the phase correction: all 10 tones are now in- phase. Two-Band Gated AGC: The AGC is a two-band device, using Orban’s patented “master/ bass” band coupling. It has an additional important feature: target-zone gating. If the input program material’s level falls within a user-settable window (typically 3 dB), then the release time slows to a user-determined level.
  • Page 50 Orban’s classic analog parametrics (like the 622B), using a sophisticated, proprietary optimization program. The curves are matched to better than 0.15 dB. This means that their sound is very close to the sound of an Orban analog parametric. They also use very high quality filter algorithms to ensure low noise and distortion.
  • Page 51 DSP-derived Stereo Encoder: The 5750’s stereo encoder is derived from algorithms first developed for the high- performance Orban 8218 stand-alone encoder. The 5750’s stereo encoder operates at 512 kHz-sample rate to ease the performance requirements of the D/A converter’s reconstruction filter, making it possible to achieve excellent stereo separation that is stable over time and temperature.
  • Page 52 Limiter is controlled by the COMPOSITE LIMIT DRIVE control as usual. Composite Limiter/Clipper: Orban has traditionally opposed composite clipping because of its tendency to interfere with the stereo pilot tone and with subcarriers, and because it causes inharmonic aliasing distortion, particularly between the stereo main and subchannels.
  • Page 53 3-10 Operation separation when a single-channel composite waveform is clipped to 3 dB depth. To ensure accurate peak control, the limiter operates at 512 kHz sample rate. For those who prefer the sound of conventional composite clipping, we also offer a defeatable composite clipper. This also provides excellent spectral protection for the pilot tone and subcarriers.
  • Page 54 3-11 Orban 5750 Technical Manual Operation The 5750 gives you control over the Multiplex Power Threshold (in the Input/output Utilities screen). This allows you to compensate for overshoots in the signal path upstream from the 5750, preventing excessive reduction of the multiplex power.
  • Page 55 3-12 Operation With the FM->HD CONTROL COUPLING set to INDEPENDENT, there are several approaches to minimizing brightness and conditioning the signal to work well at low bitrates. • Use little or no high frequency boost in the HD equalization and band mix sections. •...

  • Page 56: Customizing The 5750'S Sound

    3-13 Orban 5750 Technical Manual Operation Customizing the 5750’s Sound Gain Reduction Metering Unlike the metering on some processors, when any THE OPTIMOD-5750 gain reduction meter indicates full-scale (at its bottom), it means that its associated compressor has run out of gain reduction range, that the circuitry is being overloaded, and that various nastinesses are likely to commence.

  • Page 57: Factory Programming Presets

    Unused structures operate constantly in the background, so switching between structures occurs with a seamless cross-fade. Unlike older Orban processors like the 8200, no DSP code is reloaded and no audio mute is necessary. Factory Programming Presets Factory Programming Presets are our “factory recommended settings” for various program formats or types. The Factory Programming Presets are starting points to help you get on the air quickly without having to understand anything about adjusting the 5750’s sound.
  • Page 58 Also, if you want to fine-tune the frequency balance of the programming, feel free to enter BASIC MODIFY and make small changes to the Bass, Mid EQ, and HF EQ controls. Unlike Orban’s 8200, you can make changes in EQ (and stereo enhancement) without losing the ability to use LESS-MORE settings.
  • Page 59 3-16 Operation COUNTRY: The COUNTRY-MEDIUM preset uses the ROCK-SMOOTH source preset. It has a gentle bass lift and a mellow, easy-to-listen-to high end, along with enough presence energy to help vocals to stand out. The COUNTRY- LIGHT preset uses the ROCK-LIGHT source preset. Modern country stations might also find ROCK-MEDIUM or ROCK- OPEN useful if they want a brighter, more up-front sound.
  • Page 60 3-17 Orban 5750 Technical Manual Operation JAZZ: JAZZ is an 8500 preset specifically tailored toward stations that play mostly instrumental music, particularly classic jazz from the LP era (Coltrane, Mingus, Monk, etc.). It is a quiet preset with a very clean, mellow high end to prevent stridency on saxes and other horns.

  • Page 61: Adjusting And Using The Browser Based Pc Remote

    3-18 Operation SPORTS: Similar to NEWS-TALK except the AGC Release (AGC Release Time) is slower and the Gate Thresh (Gate Threshold) is higher. This recognizes that most sports programming has very low signal-to-noise ratio due to crowd noise and other onfield sounds, so the preset does not pump this up as the NEWS-TALK preset would tend to do. ROCK: We have included many of the 8500-style ROCK presets and have intentionally tuned them for a smooth, mellow high frequency balance, which can complement female-skewing formats.

  • Page 62: Setting Input Levels

    3-19 Orban 5750 Technical Manual Operation SETTING INPUT LEVELS Navigate to the I/O Settings tab and open it. Select the INPUT tab on the right column. Here you will see options for input source (Digital or Analog) and the input reference level for both. This is not a traditional gain trim, you are setting the input gain reference level.

  • Page 63: Setting Analog Output Levels

    3-20 Operation SETTING ANALOG OUTPUT LEVELS The next tab down displays the analog output levels. If you are using the ANALOG OUTPUT to feed your transmitter, you can use the slider to get the peak level to within range of your modulation. Also on the analog output is the option to use FLAT or PRE- EMPHASIZED audio.

  • Page 64: Digital Output 1 (And 2)

    3-21 Orban 5750 Technical Manual Operation • Digital 1 Input audio • Digital 2 input audio • AoIP 1 Input Audio • AoIP 2 Input Audio • Streaming Input Audio The headphone level slider increases or decreases the headphone volume.

  • Page 65: Stereo Encoder

    3-22 Operation The selections for each of the two AES outputs are Internal, Sync In, and Input. Input sets a given AES3 output sample rate and synchronization to the same sample rate present at the 5750’s AES3 (audio) input. Likewise, Sync In uses the AES11 sync input’s sample rate and synchronization as the source.
  • Page 66 It should be noted that Orban uses very tight and peak controlled audio stages on its output. Any use of the output of the composite processor to make up loudness is not suggested for regulatory reasons and because of behavior of receivers when excessive modulation is used.

  • Page 67: Aoip Input

    3-24 Operation AoIP INPUT AoIP 1 and 2 can be set here for proper operating level. This is not a traditional gain trim, you are setting the input gain reference level. Be certain to leave enough headroom when setting this so it is properly driven by equipment before it.

  • Page 68: Aoip 1-4 Output

    3-25 Orban 5750 Technical Manual Operation AoIP 1-4 OUTPUT If you are using one of the AoIP OUTPUTS to feed audio, you can use the output level slider to set the peak level within range of the desired level. Also on the digital output is the option to use FLAT or PRE-EMPHASIZED audio.
  • Page 69 3-26 Operation • Monitor (A low latency signal to feed talent headphones for an “off air” experience) • HD (The output of the 5750’s HD audio path) • HD+Delay (FM audio after any delay is applied) Word Length sets the word length (in bits) emitted from the digital-channel output. The largest valid word length in the 5750 is 24 bits.

  • Page 70: Hd Digital Radio

    3-27 Orban 5750 Technical Manual Operation HD DIGITAL RADIO HD HF SHELF EQ (Pre/Post) determines whether the HD HF shelving equalizer will be placed before or after the look- ahead limiter that feeds the HD output. HD POLARITY sets the polarity of the output of the HD processing to Positive or Negative. The switch allows you to match the polarity (sometimes informally called “phase”) of the audio through the analog FM and HD transmission...
  • Page 71 3-28 Operation When the BS.1770 Safety Limiter is ON, this calibration is correct regardless of the setting of the Digital Output 100% Peak Level control. HD BANDWIDTH sets the audio bandwidth of the HD output from 15 to 20 kHz in 1 kHz steps. The user should carefully test the codec in use to ascertain if lowering the bandwidth to 15 kHz improves subjective quality.

  • Page 72: Rds And Rbds

    3-29 Orban 5750 Technical Manual Operation RDS and RBDS Your OPTIMOD includes a full-featured RDS/RBDS generator that supports dynamic PS. We presume that you are already familiar with the basics of RDS and you wish to implement RDS via your OPTIMOD.
  • Page 73 The client TCP/IP Port is only updated at the OPTIMOD when you disconnect the PC remote software from the unit. RDS MODULATOR Turns on or off the RDS subcarrier. The Subcarrier level controls the amount of RDS injection. Orban suggests using a modulation monitor that is capable of reading the 57 kHz subcarrier to make this adjustment.
  • Page 74 3-31 Orban 5750 Technical Manual Operation USING TELNET TO CONTROL TERMINAL SERVER You can control RDS from Windows directly via the Windows Telnet command line utility or the free utility PuTTY. A) Open the Windows Telnet client by typing telnet into the Windows Run box in the Start menu and hitting the Enter key on your keyboard.
  • Page 75 3-32 Operation If you have checked the OPTIMOD’s T box, when you type a command, the ERMINAL OPTIMOD will return a status line relevant to the command to the Telnet client, which will write it to the screen. The returned information will look similar to the following: PS=undefined DPS=undefined DPSS=2 Seconds...
  • Page 76 3-33 Orban 5750 Technical Manual Operation To prevent the OPTIMOD from disconnecting and being unable to reconnect if the terminal connection drops out temporarily, set the TIMEOUT value to the maximum expected duration of the dropout (in minutes). Default is 4 minutes. Note that the timeout reverts to the default each new connection; if you change the timeout for one connection, it is not retained for the next one.
  • Page 77 3-34 Operation COMMAND PARAMETER INFORMATION EXAMPLE Countdown timer for transmission of EAS (Emergency Alert System) text. Send this command after the EAS= Duration of EAS EASTIME= command. Range is 0 to 999 seconds. You may resend EASTIME=60 message (seconds) this command any time during the EAS transmission to reduce or extend the duration of the EAS message, MS=0...
  • Page 78 3-35 Orban 5750 Technical Manual Operation QUERIES Any command and ‘?’ returns the status of the encoder memory for that specific [command]  PS? command.. ST Returns all settings in encoder memory. ST HELP Reports a list of available commands HELP...
  • Page 79 3-36 Operation CHAN CHAN CHAN CHAN 89.7 94.8 99.9 105.0 89.8 94.9 100.0 105.1 89.9 95.0 100.1 105.2 90.0 95.1 100.2 105.3 90.1 95.2 100.3 105.4 90.2 95.3 100.4 105.5 90.3 95.4 100.5 105.6 90.4 95.5 100.6 105.7 90.5 95.6 100.7 105.8 90.6...

  • Page 80: Μmpx

    3-37 Orban 5750 Technical Manual Operation Program Type – US Program Type – EU Rhythm and Blues Music Weather Soft R and B Music Finance Foreign Language Children’s Programs Religious Music Social Affairs Religious Talk Religion Personality Phone-In Public Non-Commercial...

  • Page 81: Test

    This can be useful when one processor is feeding multiple transmitter sites in a network. You will need an audio transport method to transmit this signal and a receiver that will accept the Digital MPX signal. For more information on equipment that is compatible with µMPX, feel free to contact Orban support at support@orban.com...
  • Page 82 75µs preemphasis, the gain from analog input to analog output will be approximately 0 dB at 15 kHz. While this calibration may seem unintuitive, experience has shown that it greatly reduces calls to Orban customer service complaining that the frequency response of the transmission path is not flat when in fact the measurement...

  • Page 83: Utility

    3-40 Operation UTILITY The UTILITY tab allows you to customize settings in the 5750 to adapt to your airchain and regulatory requirements. PROCESSING: EXTERNAL AGC IN USE: If you are using an external AGC ahead of your STL, you will most likely want to select YES as you don’t want dual AGC action, which will cause your audio to sound unnaturally dense.
  • Page 84 3-41 Orban 5750 Technical Manual Operation The advantage of using the modulation reduction function is that the pilot injection stays constant when the audio modulation is reduced. However, using the modulation reduction function is slightly inconvenient because it requires programming and activating at least one 5750 GPI input. If you have the same subcarrier injection at all times, a more convenient alternative is to set the desired modulation level by using the Composite Level control(s).
  • Page 85 3-42 Operation PROCESSING PRE-EMPHASIS: Sets the pre-emphasis that is required for your location. Most of the Americas use 75µs, much of Europe uses 50µs. If you are unsure, consult your local regulatory body. FM POLARITY: Makes positive the output polarity of the 5750’s FM analog channel processing. In HD Radio installations, this command is useful when switching the 5750 between transmitters if the transmitters’...

  • Page 86: Remote Interface

    PHASE CORRECT: The phase correct option will “repair” asymmetrical voice audio so that it is more symmetrical and easier to process. Orban’s recommended setting is on. MONITOR SOURCE: Changes the low latency monitor from the DJ Processing option to the output of the multiband processing.

  • Page 87: Silence Detect

    3-44 Operation SILENCE DETECT • INPUT FALLBACK – When the main input fails, the 5750 will switch to the selected input on this screen. The options are ANALOG, Digital 1, Digital 2, AoIP 1, AoIP 2, or Stream. • SILENCE THRESHOLD – Sets the level at which all input audio below will start the silence delay clock. If audio remains below this level longer than the silence delay time is set, the 5750 will switch to the selected backup audio source.

  • Page 88: Stereo Enhancer

    STEREO ENHANCER: The 5750 provides two different stereo enhancement algorithms. The first is based on Orban’s patented analog 222 Stereo Enhancer, which increases the energy in the stereo difference signal (L–R) whenever a transient is detected in the stereo sum signal (L+R). By operating only on transients, the 222 increases width, brightness, and punch without unnaturally increasing reverb (which is usually predominantly in the L–R channel).

  • Page 89: Agc (Automatic Gain Control)

    AGC (Automatic Gain Control) The AGC is a two-band device, using Orban’s patented “master / bass” band coupling. It has an additional important feature: target-zone gating. If the input program material’s level falls within a user-settable window (typically 3 dB), then the release time slows to a user-determined level.

  • Page 90: Equalizer (Eq)

    You can set the slope of the LF shelving EQ to 6, 12, or 18 dB/octave and adjust the shelving frequency. The bass slope can be 6, 12 or 18dB/octave. The PHASE ROTATOR corrects asymmetrical voice energy to make it easier for the 5750 to process dry voice. Orban recommends this feature should be left on.
  • Page 91 The difference will never exceed the difference that would have otherwise occurred if the lowest frequency band was independently gated. If you are familiar with older Orban processors like the 8200, this is the maximum amount of boost that would have occurred if you had set their DJ Bass Boost controls to On.

  • Page 92: Multiband

    Orban’s classic analog parametrics (like the 622B), using a sophisticated, proprietary optimization program. The curves are matched to better than 0.15 dB. This means that their sound is very close to the sound of an Orban analog parametric. They also use very high quality filter algorithms to ensure low noise and distortion.
  • Page 93 3-50 Operation The multiband compressor/limiter can be operated in five-band or two-band mode. The 5750 controls high frequencies with distortion-canceled clipping and, in all but 5-band MX presets, with a high frequency limiter as well. The clipper operates at 256 kHz-sample rate and is fully anti-aliased. Usually, the gain reduction in band 5 is slaved to the gain reduction in band 4 (as determined by the setting of the B4 >...
  • Page 94 3-51 Orban 5750 Technical Manual Operation • MULTIBAND DRIVE – Sets the level applied to the multiband compressor and thus its average level of gain reduction. • MULTIBAND RELEASE – Sets the release rate for the multiband compressors. • DOWN EXPANDER – Downward Expander. Sets the threshold that triggers single ended noise reduction.

  • Page 95: Compressors

    3-52 Operation COMPRESSORS You can offset the adjustments made in MULTIBAND here. This will help fine tune the OPTIMOD to your tastes. • MULTIBAND ATTACK – Sets the rate of speed with which the band you are setting will decrease gain at its input. Each Band (B1-B5) has it’s own control.

  • Page 96: Speech Mode

    3-53 Orban 5750 Technical Manual Operation SPEECH MODE You can set many of the processing parameters separately for speech signals, as detected by the 5750’s speech/music detector. This allows you to tune the processing separately for speech and music. control allows you to force the 5750 into Music mode, overriding the Speech/Music detector.

  • Page 97: Bandmix

    The ON/OFF control turns on and off the output of each band. Useful in some aspects, turning off a band of processing will unmask distortion from neighboring bands, especially with aggressive presets. Orban’s intelligent clipper design prevents that type of distortion from being audible when all bands are operating, so it is best to adjust...

  • Page 98: Distortion

    3-55 Orban 5750 Technical Manual Operation DISTORTION • BASS CLIP THRESHOLD - Sets the embedded bass clipper threshold in dB below the final clipper. • HARD BASS CLIP SHAPE – Changes the shape of the knee of the gain curve of the bass clipper.
  • Page 99 3-56 Operation DISTORTION • COMPOSITE LIMIT DRIVE – Sets the amount of peak limiting in the composite limiter. • COMPOSITE LIMIT MODE – Half cosine provides better separation and maintains stereo imaging. Hard mode provides a brighter sound as it creates waveforms closer to square waves. •...

  • Page 100: Hd Limiting

    3-57 Orban 5750 Technical Manual Operation HD LIMITING • HD EQ GAIN – Determines the depth of high frequency shelving equalization produced by the parametric HF shelving equalizer. • HD EQ FREQ (Frequency) – Sets the corner of the parametric high frequency shelving equalizer •...

  • Page 101: Band Processing

    3-58 Operation 2 BAND PROCESSING In addition to five-band processing, suitable for pop music and talk formats, the 5750 offers a very high-quality two- band algorithm. This is phase-linear and features the same AGC as the five-band processor, followed by a two-band processor with look-ahead limiting.
  • Page 102 3-59 Orban 5750 Technical Manual Operation • 2B (Two Band) SPEECH DETECT – Allows the 5750 to be set to music, speech or auto mode for the speech processor. Auto will switch modes based on audio content. • 2B (Two Band) MASTER COMPRESSOR THRESHOLD – Sets the level where gain reduction starts to occur in the master band.
  • Page 103 3-60 Operation • BASS CLIP THRESHOLD – Sets the embedded bass clipper threshold in dB below the final clipper. • BASS CLIP MODE – Sets the hardness of the embedded bass clipper. There are four modes: SOFT, MEDIUM, HARD and LL HARD. •...

  • Page 104: External Encoder Loop

    3-61 Orban 5750 Technical Manual Operation • MB (Multiband) SPEECH THRESHOLD – Sets the threshold of the clipping distortion controller for speech material. • MAXIMUM DISTORTION CONTROL – Limits the maximum amount of final clipper drive reduction (in dB) that the clipping distortion controller can apply.

  • Page 106: Section 4: Maintenance

    Orban 5750 Technical Manual Maintenance Section 4: Maintenance Routine Maintenance The 5750 Audio Processor uses highly stable analog and digital circuitry throughout. Recommended routine maintenance is minimal. Periodically check audio level and gain reduction meter readings. Become familiar with normal audio level meter readings, and with the normal performance of the G/R metering. If any meter reading is abnormal, see Section 5 for troubleshooting information.

  • Page 108: Section 5: Troubleshooting

    Orban 5750 Technical Manual Troubleshooting Section 5: Troubleshooting Problems and Potential Solutions Always verify that the problem is not the source material being fed to the 5750, or in other parts of the system. RFI, Hum, Clicks, or Buzzes A grounding problem is likely. Review the information on grounding on page 2-1. The 5750 has been designed with very substantial RFI suppression on its analog and digital input and output ports, and on the AC line input.
  • Page 109 Many commercial monitors have this problem, but most of these problem units can be modified to indicate peak levels accurately. Orban uses the Belar “Wizard” series of DSP-based monitors internally for testing, because these units do not have this difficulty.
  • Page 110 For example, the overload-to-noise ratio of a typical analog microwave STL may only be 70-75 dB. In this case, it is wise to use the Orban 8200ST Studio AGC to perform the AGC function prior to the STL transmitter and to control the STL's peak modulation.
  • Page 111 Troubleshooting Figure 5-1: Typical 5750 baseband spectrum with heavy processing, 0-100 kHz. Interference from the stereo into a subcarrier is best diagnosed with a spectrum analyzer. First examine the spectrum of the 5750’s composite output to verify that program correlated noise is less than –80 dB below 100% modulation from 57 to 100 kHz.
  • Page 112 First, verify that a problem really exists by using a second frequency-measuring device and/or verifying the problem with a monitoring service. If the problem is real, contact Orban Customer Service for a crystal replacement; there is no frequency trim available.
  • Page 113 Troubleshooting L–R (Stereo Difference Channel) Will Not Null With Monophonic Input This problem is often caused by relative phase shifts between the left and right channels prior to the 5750’s input. This will cause innocuous linear crosstalk between the stereo main and subchannels. Such crosstalk does not cause subjective quality problems unless it is very severe.
  • Page 114 5750, or an inaccurate modulation monitor that is causing you to under-modulate the carrier. A station may suffer from any combination of these problems, and they can have a remarkable effect on the overall competitiveness of a station’s sound.. Technical Support If you require technical support, contact Orban customer service. http://www.orban.com/contact/ for contact information.
  • Page 115 Returned units will be returned C.O.D. if the unit is not under warranty. Orban will pay return shipping if the unit is still under warranty.

  • Page 116: Section 6: Technical Data

    Orban 5750 Technical Manual Technical Data Section 6: Technical Data J613: As shipped from the factory, a jumper is kept across pins 1 and 2 of J613, and a second jumper is kept across its pins 3 and 4. The jumpers engage the direct connection from AES/EBU DIGITAL INPUT 1 to AES/EBU DIGITAL OUTPUT 1 made by the relay bypass function when OPTIMOD processing is unavailable.
  • Page 117 Orban 5750 Technical Manual Technical Data...

  • Page 118: Using Lossy Data Reduction In The Studio

    Orban 5750 Technical Manual Technical Data Using Lossy Data Reduction in the Studio Many stations are now using lossy data reduction algorithms like MPEG-1 Layer 2 or Dolby AC2 to increase the storage time of digital playback media. In addition, source material is often supplied through a lossy data reduction algorithm, whether from satellite or over landlines.
  • Page 119 Technical Data Most modern studio audio devices have a clipping level of no less than +21dBu and often +24dBu or more. The studio standardizes on a maximum program indication on the meter that is lower than the clipping level, so peaks that the meter does not indicate will not be clipped.

  • Page 120: Line Up Facilities

    Orban 5750 Technical Manual Technical Data Transmission Levels The transmission engineer is primarily concerned with the peak level of a program to prevent overloading or over- modulation of the transmission system. This peak overload level is defined differently, system to system. In FM modulation (FM / VHF radio and television broadcast, microwave or analog satellite links), it is the maximum- permitted RF carrier frequency deviation.
  • Page 121 Composite Output Level The Orban 5750 Audio Processor controls instantaneous, absolute peak levels to a tolerance of approximately 0.1 dB. Composite modulation is indicated in percentage modulation, absolute instantaneous peak indicating. 100% is calibrated to the highest composite peak modulation level that the processing will produce, including the pilot tone, under any program, processing, or setup condition (except when the processing is switched to BYPASS).
  • Page 122 Orban 5750 Technical Manual Technical Data Meter uses silence gating and its integration time is 10 seconds. Because the meter is always monitoring program material, it integrates the previous 10 seconds of program material and weights all program material equally within the specified time window.

  • Page 123: Itu-R Multiplex Power Controller

    Technical Data When the 5750’s left/right analog output is switched to FLAT, a de-emphasis filter is inserted between output of the 5750’s audio processing and its line output. Thus, as the frequency of the Test Tone is changed, the level at the 5750’s line output will follow the selected de-emphasis curve.
  • Page 124 Orban 5750 Technical Manual Technical Data Because the 5750 does not digitize subcarriers applied to its subcarrier inputs, the 5750’s MPX P OWER meter (which operates in the DSP domain) cannot indicate the power added by such subcarriers. These usually have constant power, so it is easy to compensate for them.
  • Page 125 Technical Data If your country enforces the standard, you should set the control to complement the amount of peak overshoot in the transmission system following the 5750. Setting the control at “0” will correctly control the multiplex power when there is no overshoot after the 5750. This will typically be true when you are using your Optimod’s built-in stereo encoder to drive the transmitter directly.
  • Page 126 Preset 0: No gating: Works like Orban’s older, non-gated MPX power controller. Preset 1: Only the quieter passages are gated and the gated release is faster than it is in the other presets. Created to maximize loudness within the BS.412 limit while providing more on-air dynamics and preventing unnecessary gain...
  • Page 127 6-10 Technical Data Test Modes Setup: Test Parameter Labels Units Default Range (CCW to CW) Step Mode — Operate Operate, Bypass, Tone — −18 … +25 Bypass Gain 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, Tone Frequency 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000,...

  • Page 128: Section 7: Specifications

    7-11 Orban 5750 Technical Manual Specifications Section 7: Specifications It is impossible to characterize the listening quality of even the simplest limiter or compressor based on specifications, because such specifications cannot adequately describe the crucial dynamic processes that occur under program conditions. There- fore, the only way to evaluate the sound of an audio processor meaningfully is by subjective listening tests.

  • Page 129: Delay

    7-12 Specifications Delay Defeatable Analog FM Diversity Delay: 0.27 to 12.0 seconds, adjustable in one-sample increments at 64 kHz sample rate to allow the delays of the analog and digital paths in the HD Radio system to be matched at the receiver output. When the Diversity Delay Mode = FM_HD, to avoid introducing artifacts in the analog FM path, its delay is held constant and HD delay is varied if the adjustment does not exceed ±1.3 seconds.

  • Page 130: Digital Audio Input

    7-13 Orban 5750 Technical Manual Specifications Load Impedance: 600Ω or greater, balanced or unbalanced. Termination not required or recommended. Output Level (100% peak modulation): Adjustable from –6 dBu to +24 dBu peak, into 600Ω or greater load, software-adjustable. Signal-to-Noise: >= 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz–15 kHz bandwidth, referenced to 100% modulation).

  • Page 131: Wordclock/10 Mhz Sync Reference

    7-14 Specifications The digital composite baseband is internally sampled at 384 kHz and alternate samples are placed on the left and right audio channels. This is equivalent to complex (I/Q) sampling and, with compatible receiving hardware, allows the full frequency baseband frequency range to be accommodated without aliasing. If the frequency range of the SCAs applied to the digital output is limited to less than 96 kHz, this is fully compatible and interoperable with the existing system adopted by the industry, which uses only the left channel at 192 kHz.

  • Page 132: Audio-Over-Ip I/O (Aoip)

    7-15 Orban 5750 Technical Manual Specifications Audio-Over-IP I/O (AoIP) Standard: With Dante Module: Fully supports Dante networks. SMPTE ST2110-30 RTP AES67 compliant With AES67 Module: AES67 SMPTE ST-2110-30/31, NMOS4, NMOS5 and seamless switching ST2022-7, RAVENNA compliant Number of Input Channels Supported: Two (2) stereo pairs.

  • Page 133: Subcarrier (Sca) Inputs

    7-16 Specifications Crosstalk-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation). Crosstalk-Non-Linear: <= –80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation). 38 kHz Suppression: >= 70 dB (referenced to 100% modulation). 76 kHz &...

  • Page 134: Μmpx Codec (Optional)

    7-17 Orban 5750 Technical Manual Specifications µMPX Codec (optional) Supported bitrates: 320, 384, 448, 576 kbps. Supports error correction, redundant connections, multicast/broadcast connections Streaming Audio Monitor (optional) Audio Codecs: standard MPEG Layer 3 (MP3) and OPUS. Audio Bitrate: 32, 64, 96, 128,192, 256, 320 kbps Audio Sample Rate: 32, 44.1, 48 kHz...

  • Page 135: Remote Control (Gpi) Interface

    7-18 Specifications Remote Control (GPI) Interface Configuration: Eight (8) inputs, opto-isolated and floating. Voltage: 6–15V AC or DC, momentary or continuous. +12VDC provided to facilitate use with contact closure. Connector: DB–25 male, EMI-suppressed. Control: User-programmable for any eight of user presets, factory presets, bypass, test tone, stereo or mono modes, analog input, digital input.
  • Page 136 Shipping Weight: 17.64 lbs / 8 kg Warranty Five Years, Parts and Service: Subject to the limitations set forth in Orban's Standard Warranty Agreement. See page 1-5. Because engineering improvements are ongoing, specifications are subject to change with- out notice.

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