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Related Manuals for Inovonics DAVID IV 719 N
Summary of Contents for Inovonics DAVID IV 719 N
- Page 1 DAVID IV 719 N...
- Page 3 DAVID IV...
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Page 5: Table Of Contents
TABLE OF CONTENTS Section I – INTRODUCTION DAVID IV PRODUCT DESCRIPTION ..................History DAVID IV FEATURES ..............Framework Features ..............Processing Attributes DAVID IV TECHNICAL SPECIFICATIONS ..............General Performance .............. Rear-Panel Appointments ............Audio Processing Features ................ The User Interface ................ - Page 6 COMPOSITE-MPX OUTPUTS ..........Composite-MPX and Pilot Levels ............Confirming Pre-Emphasis ............Monaural Operation Options ..............Multiplex Output Servo RDS COMBINING PROVISION ..............19kHz Sync Output .................. RDS Input ............... Injection Metering ..............Setting RDS Injection THE HD RADIO™ DELAY MODULE ............
- Page 7 Section IV – PROCESSOR SETUP PROCESSOR PRESETS ............... Selecting Presets ........Creating, Managing and Saving Presets SELECTING THE INPUT ..................Inputs SETTING INPUT GAIN ............Importance of AGC Action ..............Test Tones …or not? ..............Adjusting Input Gain THE HIGH-PASS FILTER ...............
- Page 8 UPDATING THE FIRMW ARE ..................Warning ..............Firmware Update Files ............. Running the Firmware Updater ............Aborting a Firmware Update ..........Updating the DAVID IV Webpages THE FRONT-PANEL MENU TREE ..............OLED Menu Listing INOVONICS WARRANTY ........Inside Back Cover — 4 —...
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Page 9: Section I - Introduction
Section I INTRODUCTION DAVID IV PRODUCT DESCRIPTION The 719 was fourth in Inovonics’ series of “DAVID” FM Broad- History cast Processor/Stereo Generators, the name David inferring Bib- lical reference to this series of airchain audio processors that deliver giant-killing performance with modest cost of owner- ship and simplicity of operation. -
Page 10: Processing Attributes
Stereo-enhancement options address both the apparent width of the stereo image as well as solo (center channel) fullness. ‘Look-ahead’ final limiting includes Inovonics’ proprietary PIPP™ limiter technology to assure unprecedented modu- lation efficiency. Support for the European ITU-R BS.412.9 Standard with flexible, automatic control of r.m.s. -
Page 11: David Iv Technical Specifications
DAVID IV TECHNICAL SPECIFICATIONS Some specifications of the DAVID IV are difficult to quantify in tabular form. Please refer to a corresponding section of the manual text for additional information or discussion. Stereo Separation: GENERAL PERFORMANCE Composite/MPX Output: PLEASE NOTE: >65dB, 20Hz–15kHz assuming the use 1) The gain structure of an audio processing of a lab-quality FM-multiplex decoder. -
Page 12: Audio Processing Features
When RDS is enabled, the Sync Output components. (BNC) delivers a 5V p-p TTL-compatible square wave at the 19kHz pilot fre- PIPP™ Peak Limiter: Inovonics’ exclusive Polarity-Indepen- quency; 75-ohm source. dent Peak Processor assures optimum IP Network Port: modulation of the FM carrier or other An RJ45 jack accepts TCP/IP network transmission system. -
Page 13: The User Interface
HD Radio Delay (Optional): MISCELLANEOUS An optional plug-in circuit board allows Test Tone Generator: the composite/MPX output of the DA- 20Hz–20kHz, pre- or post-processing; VID IV to be delayed from 1ms to 9.999 60dB attenuator. seconds in 1ms increments, relative to the analog and digital program line AC Mains Requirements: outputs when they are set to the 20kHz... - Page 14 DAVID IV - 719N Block Diagram — 10 —...
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Page 15: Section Ii - Installation
As soon as the equipment is received, inspect carefully for any shipping damage. If damage is found or suspected, notify the carrier at once, and then contact Inovonics. We recommend retaining the original shipping carton and pack- ing materials for return or transshipment. If returned for War-... -
Page 16: Mounting
MOUNTING The DAVID IV mounts in a standard 19-inch equipment rack Rack and requires only 1¾ inches (1U) of vertical rack space. We Requirement recommend using plastic or fiber washers to protect the paint- ed finish around the mounting holes. Consuming less power when it’s running than many consumer Heat Dissipation products do when they are turned off, the DAVID IV itself gen-... -
Page 17: Aes Digital Input
shield grounds and the AC power cord ground. A ‘ground- lifting’ AC adapter may well remedy such a situation, although the chassis must somehow be returned to earth ground for safety. Generally, being screwed-down in the equipment rack will satisfy the safety requirement. PROGRAM LINE INPUTS The female XLR connector labeled AES DIGITAL INPUT is a bal- AES Digital... -
Page 18: Program Line Outputs
PROGRAM LINE OUTPUTS DAVID IV digital and analog line outputs are available simulta- neously and are independently adjustable and assignable to a specific output characteristic. These outputs, found under Set- up, have options described as follows: 20k-Flat is a full-range (20kHz) output that comes directly from 20kHz Flat the output of the broadband peak limiter. -
Page 19: Analog Line Outputs
In digital signal distribution it is customary to maintain the av- erage level of the program audio (“zero” on a VU meter) a com- fortable value below digital full scale to allow headroom for program peaks. This ‘headroom offset’ is historically on the order of 20dB for raw, unprocessed audio, but since the output of the DAVID IV is tightly peak-limited there is no headroom is- sue even when this is set wide-open at 0dB. -
Page 20: Composite-Mpx Outputs
COMPOSITE-MPX OUTPUTS There are two independent composite/MPX outputs on the rear panel of the DAVID IV. These are unbalanced BNC connectors, not surprisingly labeled MPX OUT 1 and MPX OUT 2. Their source impedance is a resistive 75 ohms. The level of the multiplex signal at each output is independent- Composite-MPX ly adjusted with the MPX Level 1 (Vp-p): and MPX Level 2 (Vp-p): and Pilot Levels... -
Page 21: Multiplex Output Servo
The DAVID IV employs an open-loop servo system to maintain Multiplex the multiplex output at the precise level set by the user. As ei- Output ther the 19kHz stereo pilot level or the RDS injection level is Servo adjusted (or even turned off), the composite/MPX output re- mains constant so that no back-and-forth tweaking is required. -
Page 22: The Hd Radio™ Delay Module
Next, connect your encoder. If it is programmed and ready to go, you may switch RDS Input: to Enable. Watching the numbers associated with the slider, carefully ad- vance Level or RDS Injection. The RDS Injection (%): or lighted portion of the slider will creep up from the bottom of the box, and at some point you should begin to see the injection per- centage appear. -
Page 23: Adjusting The Delay
This yet-to-be-solved shortcoming in the HD Radio system jus- tifies a shameless plug for the Inovonics JUSTIN 808, a fully au- tomatic time-alignment processor. The JUSTIN constantly mon- itors your station off-air and makes incremental adjustments in the delay and in r.m.s. - Page 24 flawless sync perpetually. This is a standalone processor that works with any audio processor, any make of HD Radio ‘im- porter’ or ‘exporter,’ and any FM exciter. You can check it out here: https://www.inovonicsbroadcast.com/product/808 — 20 —...
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Page 25: Section Iii - Getting Ready
Section III GETTING READY This section of the manual introduces the initial steps for get- ting the DAVID IV set up for operation, and discusses certain implications of the many audio processing adjustments. Please refer back to the previous section for information on the physi- cal interconnection of the unit with other station equipment. -
Page 26: Downloading And Backing-Up Settings
The DAVID IV comes with 25 Factory Presets and space for 20 User Presets. Presets are handled in more detail on Page 29, just ahead of the discussions of processor setup. There are interactions between the two general groupings of DAVID IV adjustments. -
Page 27: Metering
Bargraph meters E give peak-responding readouts of input and Metering output levels, as well as AGC gain and compressor/limiter gain- reduction values. Turn the jog-wheel to cycle among highlighted menu items, and Jog-Wheel and then push the jog-wheel to select or adjust the highlighted Back Button item. -
Page 28: Connecting To The David Iv
The Web interface is English-only, but Google Translate works like a champ. CONNECTING TO THE DAVID IV Without a doubt, initial setup is best done with a PC, as mouse- LAN Setup and-keyboard options for navigation and for adjusting things is more precise than the touch screen of a tablet or phone. -
Page 29: The Now Playing Page
differences between the front-panel and Web interface menu trees, you may have to search a bit when using the jog-wheel knob, but almost all settings available on the Webpages can be made from the front panel as well. Any major differences will be addressed in the discussions. -
Page 30: Program Input
The first information panel under the alarm indicators shows Program Input which program input source, analog or digital, is currently feeding the DAVID IV. The lower panel displays the incoming AES digital audio sample rate when AES audio is connected, whether or not the digital input is currently feeding program to the unit. -
Page 31: Lost Password (Hard Reset)
The DAVID IV will lock any time the screen times-out and goes dark, about two minutes after the knob is left untouched. It may also be locked immediately by holding down the Back but- ton for a few seconds. Once the DAVID IV is password-protected it prompts you to en- ter the password before any menu can be accessed and any ad- justments made. -
Page 32: Downloading (Saving) The Profile
date processor settings, change-out exciters or otherwise revise any adjustments. 1) In the Hardware Profile section of the Admin Webpage, click Downloading Your browser will probably Download Hardware Profile. (Saving) ask whether you want to Run or Save this file. Save it. the Profile 2) In this... -
Page 33: Section Iv - Processor Setup
Section IV PROCESSOR SETUP PROCESSOR PRESETS The DAVID IV comes with 25 thoughtfully-crafted Factory Pre- sets that cover a wide range of programming genres. You are free to modify any of these and save them as your own User Presets, up to a total of 20 additional ones in fact, leaving the Factory Preset you started with intact. -
Page 34: Selecting The Input
SELECTING THE INPUT The DAVID IV has both an AES3 (stereo) digital input and indi- Inputs vidual left/right analog inputs. Either set can serve as the pro- gram input to the unit, and the selected input is shown on the Now Playing Webpage. -
Page 35: Test Tones
headings to confirm that the AGC is active, with a correction rate of 1.75dB/sec, a (maximum) AGC Gain of +18dB, and a Window setting of 6dB. Although a “zero-VU” test tone may certainly be used during Test Tones DAVID IV setup, input gain is most accurately set with actual …or Not? program material. -
Page 36: The High-Pass Filter
The dB gain numbers shown beside each input gain slider are handy for reference and have been scaled so that 0dB equates to the program average level at nominal studio line level fig- ures. This might be +4dBu for analog inputs or –20dBFS for digital feeds. -
Page 37: Agc Maximum Gain
confident that the board operator is diligent and knows his stuff. Even in the latter instance, trust the AGC to know best what the downstream processing stages want to see. Classical music and jazz are two genres that often have wide level variations that beg to be preserved. -
Page 38: Windowing' And The Agc Correction Rate
program, although it will definitely erase longer-term level vari- ations in a hurry. Some settings might allow AGC action to be audible in speech, during a talk-show segment for example, but not during musi- cal programming. You might want to experiment with various AGC rates using program material representative of your for- mat. -
Page 39: The Five-Band 'Multipressor
shown here. Just like the stereo width enhancement, the lighted area in the OLED and numbers in both lo- cations are arbitrary and relative. Use this enhancement technique with some caution. A hawker of toilet tissue who seems to fill the listener’s automobile may be a bit intimidating to driver and passengers alike! Stereo enhancement effects can be subtle, depending in large part on program source. -
Page 40: Spectral Loading
A proper setting for Master Drive (dB): will probably be some- where near the center of its range. Indeed, the factory-default setting is 15dB, although individual Factory Presets will have varying values for specific formats. Generally, a lower setting is called for with classical, jazz and ‘easy-listening’... -
Page 41: Program Equalization
10 (fully independent). The factory-default value is 5, midway between the extremes, although the various Factory Presets will have varied settings. Use your ears with this slider to deter- mine how ‘busy’ you want the audio to sound. PROGRAM EQUALIZATION Not surprisingly, the same 5 Multipressor bands are the basis for a 5-band graphic equalizer that enables static equalization control over the program’s spectral shape. -
Page 42: Crossover Points
The crossover frequencies for the 5-band Multipressor are vari- Crossover able over an octave’s range, a 2:1 frequency ratio. Here is a Points screenshot of that setup area that shows basic factory-default values smack-dab in the middle of the range. Factory Presets may depart from these mid-value settings. -
Page 43: Bass Effects
If you find that you cannot set an attack time to a higher (slow- er!) value that you’d like to try, check the associated release time. You will have to set the release to a larger (slower) num- ber before you will be allowed to increase the attack to the number you want to try. -
Page 44: Program Peak Control
PIPP* is an acronym for Polarity-Independent Peak Processing, PIPP* Limiting Inovonics-patented and proprietary technology used in both analog and digital processing products from our firm. This is a function that can be turned on or off by the user and, when it is disabled, the DAVID IV peak controller behaves much like any contemporary “lookahead”... -
Page 45: Lookahead Limiting
The only truly undistorted audio waveform is a pure tone, a sine wave. A sine wave is inherently a symmetrical waveform with the positive and negative halves mirror-images of one an- other. The PIPP* limiter would divide, limit and recombine these halves to create a spitting image of the original: an ampli- tude-limited symmetrical sine wave with no added distortion components. -
Page 46: Limiter Drive
ticular program material sounds to you, which of course also depends on the setup of other processing parameters. To be on the safe side, you may initially elect to proceed with DAVID IV setup using the Normal limiter selection that does not include our controversial ‘waveshape-symmetry management’... -
Page 47: Multiplex Power Control (Bs.412.9)
A proper setting of the Limiter Density (dB): control is deter- mined entirely by subjective evaluation of the on-air sound. Density is one very important quality of the station’s signature sound, and no other control has a greater effect over perceived loudness. -
Page 48: Other Itu Processing Implications
With ITU selected, the PIPP* limiter is defeated in favor of more Secondly, the Limiter conservative symmetrical peak control. Drive and Limiter Density (dB): sliders are re-scaled for less- aggressive overall processing. The Limiter Density (dB): slider becomes a dBr BS.412-9 (dBr): slider. The dBr BS.412-9 (dBr): slider is recalibrated to the multiplex r.m.s. -
Page 49: Composite Clipping
The DAVID IV utilizes ‘adaptive pre-emphasis,’ a term we coined to describe an independent high-frequency limiter that follows the broadband peak controller. Because this HF limit- ing is performed only in the pre-emphasized domain, a judi- cious amount of HF clipping may also be employed without causing painful audible artifacts. -
Page 50: Test Oscillator
advantage with care. A conservative figure, the factory default value of 1.0dB, is generally benign. TEST OSCILLATOR The DAVID IV sports a built-in test tone generator (audio oscil- lator) that may prove helpful in setting up the DAVID IV, for troubleshooting, or in verifying overall system performance. -
Page 51: Section V - Networking Considerations
Section V NETWORKING CONSIDERATIONS The previous brief introduction to network connection and set- up allowed use of the Web interface for processor, stereo-gen and RDS setup. This section of the manual will go into a bit more detail on some points already covered, and will address other aspects and additional DAVID IV functions that require a better understanding of networking the unit. -
Page 52: Assigning The Http Port
dress bar. Other operating systems generally require entering the numerical IP address of the unit. HTTP Port: 80 is a customary default port assignment for HTTP HTTP Port traffic that rarely, if ever, needs to be changed. Be sure you are aware of the IT implications and consequences if you plan to change this. -
Page 53: Dynamic Dns Abuse
Open the Dynamic DNS menu and click in the Mode: area to ex- pose the drop-down menu shown here. Note that three DNS- forwarding services are named here. We advise to choose one of these as they have proven most dependable over time. Type any of these names into a Web browser to learn the fea- tures and cost of their respec-... -
Page 54: Snmp Settings
Click on SNMP in the main menu to bring up the SNMP Settings SNMP Settings Webpage. (From the front panel: Setup / Network / SNMP.) Mode is disabled by default, inhibiting any communications be- tween the DAVID IV and the SNMP Manager. Reset this to Read Only to allow the DAVID IV to be interrogated by the SNMP Manager, enabling programmed setup parameters and alarms to be integrated with other equipment on the network. -
Page 55: Updating The Firmware
A firmware update is done in situ, at the processor installation site. The DAVID IV includes a ‘bootloader’ utility that allows firm- ware to be updated whenever Inovonics issues changes to add features to improve performance or otherwise expand the use- fulness of the product. Inovonics supplies firmware updates at no additional charge. -
Page 56: Running The Firmware Updater
Make a temporary New Folder on your PC Desktop and unzip the update files to it as shown in the illustration below. Navigate to your temporary Desktop folder (New folder) and Running the double-click the Firmware Update.exe file. This is the bootloader Firmware file marked with the arrow in the snapshot above. -
Page 57: Aborting A Firmware Update
When the DAVID IV is ready to accept the firmware update it will display the message on the right. Next, click: Find All Devices at the top of the bootloader window. The IP address of your DAVID IV should appear in the Select: field, confirming that you are properly connected. - Page 58 So, immediately after the firm- ware update is bootloaded, and while the DAVID IV is still in communication with your com- puter, return to the unzipped bootloader folder and double- click the Webpage Uploader.exe file shown with an arrow at right.
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Page 59: Oled Menu Listing
FRONT-PANEL MENU TREE This is a tabulated listing of the front-panel OLED menu tree to OLED Menu help identify any differences between Web interface and front- Listing panel menu callouts. The list shows all submenu levels under the main screen head- ings, and also indicates what actions may be taken at that level. - Page 60 Setup (continued) HD Radio Delay Network Enable / Disable (select) IP Settings Delay (set) Port: (data entry) Alarms DHCP / Static IP (select) Analog Audio Loss IP: (data entry for Static IP) Disable / Enable (select) Gateway: (data entry for Static IP) Threshold On (set) Subnet: (data entry for Static IP) Time On (set)
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Page 61: Inovonics Warranty
INOVONICS WARRANTY TERMS OF SALE: Inovonics products are sold with an understand- ing of “full satisfaction”; that is, full credit or refund will be issued for products sold as new if returned to the point of purchase within 30 days following their receipt, provided that they are returned complete and in an “as received”...
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