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Inovonics David IV Installation & User Manual

Fm audio broadcast processor
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DAVID IV

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Summary of Contents for Inovonics David IV

  • Page 1 DAVID IV...
  • Page 3 DAVID IV...

  • Page 5: Table Of Contents

    TABLE OF CONTENTS Section I – INTRODUCTION DAVID IV PRODUCT DESCRIPTION ..........Features DAVID IV TECHNICAL SPECIFICATIONS ........General Performance Rear-Panel Appointments Audio Processing Features The User Interface Miscellaneous BLOCK DIAGRAM ................Section II – INSTALLATION GENERAL ..................Menu Navigation Setup Using the Software UNPACKING AND INSPECTION ............
  • Page 6 Section III – SETUP AND OPERATION USER ADJUSTMENT GROUPINGS ..........Setup Adjustments Processing Adjustments Backing-up Settings “QUICK START TECHNOLOGY” ........... ‘Instant Boot’ Brownout Detection NAVIGATING THE MENUS ............Graphic Display Jog Wheel and Back Button Menu Timeout and Screensaver SELECTING THE INPUT ..............SETTING INPUT GAIN ..............
  • Page 7 ADMINISTRATIVE SETTINGS ............Passwords Lost Password (Hard Reset) Display Brightness Section IV – NETWORKING THE DAVID IV CONNECTING THE DAVID IV TO YOUR NETWORK ....DHCP Assignment Manual IP Setup COMMUNICATING FROM OUTSIDE THE LOCAL NETWORK ..What is Dynamic DNS?
  • Page 8 DIRECT COMPUTER CONNECTION TO THE DAVID IV ....Setting-up an ‘Imaginary’ Network DAVID IV Settings Section V – DAVID IV REMOTE-CONTROL SOFTWARE GENERAL ..................INSTALLING THE SOFTWARE ............Confirming a Network Connection Running the Software REMOTE CONTROL OF THE DAVID IV ........

  • Page 9: Section I - Introduction

    DAVIDs I through III made exclusive use of analog circuitry, but the DAVID IV moves into the digital realm as a DSP-based product. As such it more approximates an audio processing engine that is easily upgraded in the field as new processing al- gorithms are suggested, developed and released.

  • Page 10: David Iv Technical Specifications

    Intuitive front-panel setup and full remote operation over any IP network. Provided software runs under Windows XP or later with easy PC backup of all DAVID IV settings. Low latency for off-air monitoring; boots or resets in less than one second; draws only 8 watts from the AC mains.

  • Page 11: Rear-Panel Appointments

    An RJ45 jack accepts TCP/IP network >65dB with reference to 5% RDS sub- connections for remote setup and op- carrier injection. eration of the DAVID IV. (Page 43) Headphone Jack (Front Panel): REAR-PANEL APPOINTMENTS A quarter-inch (TRS) headphone jack al-...

  • Page 12: The User Interface

    This Block Dia- gram, on the other hand, has been deliberately organized as if the DAVID IV were an analog processor, with the hope that this deviation from reality might give the reader a more familiar and understandable representation of the various audio processing functions.
  • Page 13 GENERATOR AUTO SERVO PHONES MONITOR MPX OUT 1 MPX OUT 2 (PILOT BYPASS) DE-EMPH SWITCHING RDS INPUT AND LEVEL RDS SYNC DIGITAL LINE OUT SWITCHING AND LEVEL ANALOG LINE OUT Figure 1 – DAVID IV Block Diagram — 9 —...

  • Page 14: Section Ii - Installation

    Section III that describes DAVID IV setup and use. Do please refer back to this section, however, to confirm proper physical installation and intercon- nection with other equipment.

  • Page 15: Mounting

    AC ‘hot,’ blue for AC neutral and green with a yellow stripe for earth ground. RADIO FREQUENCY INTERFERENCE (RFI) Although it is expected that the DAVID IV may be installed Location alongside powerful FM transmitters, please practice care and common sense in locating the unit away from abnormally high RF fields.

  • Page 16: Ground Loops

    Also, there may Operation be a legitimate reason to feed the DAVID IV directly from a CD or MP3 player or computer sound card in a ‘professional’ emer- gency. Sufficient gain has been included to interface with sin- gle-ended inputs in the –10dBv, consumer-level range.

  • Page 17: Program Line Outputs

    PROGRAM LINE OUTPUTS DAVID IV digital and analog line outputs are available simulta- neously and may independently be adjusted in level and as- signed the characteristic selected in the Setup / Audio Output menu (Page 34). Line outputs may individually be set for a 20kHz flat character- istic for digital radio, streaming, or other flat-power-bandwidth applications.

  • Page 18: Rds Combining Provision

    0.5V to 5V, corre- sponding to a typical injection level that’s approximately 5% of total carrier deviation. The DAVID IV has an accurate and helpful internal metering Internal utility for adjusting the RDS subcarrier injection. The actual...

  • Page 19: Section Iii - Setup And Operation

    SETUP AND OPERATION This section of the manual takes the user through the steps of getting the DAVID IV into operation and discusses certain im- plications 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 20: Backing-Up Settings

    All setup adjustments, as well as factory and user processing Backing-up presets in DAVID IV memory at the time, may be backed up as Settings Profiles using the provided software (Page 56). Also, just the user processing Presets may be individually saved as small files, handy for sharing between stations in a group that want to sound the same while maintaining each station’s...

  • Page 21: Jog Wheel And Back Button

    SELECTING THE INPUT The DAVID IV has both an AES (stereo) digital input and indi- vidual left/right analog inputs. Either set can serve as the pro- gram input to the unit. Characteristics of these inputs are dis- cussed in the Specifications (Page 6) and in Section II (Page 12).

  • Page 22: Setting Input Gain

    The front-panel GATE indicator glows when the gate is ‘open’; that is, when the AGC is active. AGC is considered a processing parameter of the DAVID IV, but one that, by design, does not make an audible contribution to the station’s “signature sound.”...
  • Page 23 Audio levels are measured and monitored in many different ways. The traditional mechanical “VU” and European “PPM” (Peak Programme Meter) each adhere to rigid measurement standards. But there are many knock-offs and alternative level- indicating gizmos as well, few of which have traceability to any recognized standard.

  • Page 24: The High-Pass Filter

    THE HIGH-PASS FILTER The DAVID IV is equipped with a steep high-pass filter to lessen the modulation-robbing effects of unwanted subaudible pro- gram audio components. The term ‘unwanted’ is the keyword here, as “mega-bass” seems a mandatory part of any car audio installation, and a “big bottom-end”...
  • Page 25 In fact, adjustable AGC rate has seldom been availa- ble in previous Inovonics broadcast processors. The DAVID IV allows the user to change the correction rate be- tween a setting of 1, an exceedingly slow 0.1dB/second, and 9, a really speedy 2.5dB/second.

  • Page 26: Stereo Enhancement

    STEREO ENHANCEMENT The DAVID IV has a twin-action stereo enhancer. Navigate to the Processing / Stereo Enhance menu: The Stereo Enhance menu has check boxes to turn the enhance- ment effects on and off, plus two sliders that graphically depict the action of this feature.

  • Page 27: The Five-Band 'Multipressor

    Drive: There are two adjustments in this menu. The first, Master Drive, Compressor varies the total signal level going into the DAVID IV compres- Drive sion section. The setting of this control determines how hard the compressor will work, overall, and to a large extent how ‘busy’...

  • Page 28: Spectral Loading

    Full linking does not actually turn the DAVID IV into a single- band unit, however, as each band is still able to respond inde- pendently to program peak energy within that band’s range.

  • Page 29: Program Equalization

    Open the Processing / Com- pression / Multipressor menu. This gives access to five EQ sliders: The five DAVID IV bands are labeled: Bass, Low, Mid, Pres and The 5 Bands High, and have these nominal boundaries:...

  • Page 30: Bass Character Enhancement

    ‘ducking’ as a result. Listen for this and make your adjustments accordingly. PROGRAM PEAK CONTROL Control of program peaks by the DAVID IV is accomplished in two sections: 1) a broadband final limiter and: 2) ‘adaptive pre- emphasis,’ which is essentially independent limiting for high frequencies subject to FM pre-emphasis.

  • Page 31: Broadband Limiting

    Inovonics. This is a function that can be turned on or off by the user, and when disabled the DAVID IV peak controller behaves much like any contemporary “lookahead” limiter. In the PIPP* mode, the program audio waveform is split into positive-going and negative-going components.
  • Page 32 PIPP* limiting. Anyway, there’s an option to turn this novel feature off if you don’t buy any of this. The DAVID IV final limiter is a lookahead limiter, meaning that Lookahead it acts to reduce program peaks essentially before they reach it.

  • Page 33: Multiplex Power Control (Bs.412.9)

    Limiter Density serves a similar function for the average level of the program. The attack time of the DAVID IV peak controller is matched to the delay of the limiter ‘lookahead’ feature. Limiter release, on the other hand, has a dual-slope, ‘platform’ function, with a quick release to the platform value, and then a much slower re- lease of the platform itself.

  • Page 34: The Itu "Recommendation

    But Austria and Switzerland are able to exceed that point by 3dB. In other words, their r.m.s. modulation is permit- ted to go to “+3dBr.” The DAVID IV provides compliance to the ITU standard by re- defining the peak-limiting processing function when the option is selected.

  • Page 35: Adaptive Pre-Emphasis

    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 is also employed.

  • Page 36: Composite Clipping

    This time-aligning “diversity delay,” as it is called, is enabled in the DAVID IV with an optional accessory circuit board that is simply plugged into a header strip on the main board. If you are adding the HD Radio delay option in the field, first Installing disconnect power from the unit.
  • Page 37 Now turn the knob to set the time to 8 seconds and push it to activate the setting. NOTE: To obviate frustration and blisters, the DAVID IV will race through the 1ms increments at an accelerated rate when the jog wheel is turned fast and furiously. Turn the jog wheel slowly for precise 1ms steps.

  • Page 38: Program Line Outputs

    PROGRAM LINE OUTPUTS The digital and analog line outputs of the DAVID IV are availa- ble simultaneously, and are independently programmable as to their output characteristic and output peak level. Depending...
  • Page 39 This ‘head- room offset’ is historically on the order of 20dB for raw, unpro- cessed audio, but since the output of the DAVID IV is tightly peak-limited there is no headroom issue even when this is set wide-open at 0dB.

  • Page 40: Sample Rate Converter

    Here the Input Rate (digital sampling rate) of the AES program input is automatically displayed in the upper box if a digital in- put is connected to the DAVID IV. The sampling rate of the AES digital output is selected in the lower box. Press the jog wheel to enable the Output Rate selector, and turn the knob to pick a fixed output rate.

  • Page 41: Mono Mode And Pilot Injection

    50us or 75us, and then push the knob to characteristic: set it and fix this selection in the DAVID IV non-volatile memory. The None option is included for test purposes only. Press the Back button to return to the Stereo Generator menu.

  • Page 42: Rds Setup

    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-...

  • Page 43: Processing Presets

    RDS peak level, the relationship be- tween the numbers and the position of the slider will depend on the output level of the encoder. The DAVID IV accepts a wide range of input levels, but an input between 0.5V p-p and 5V p-p is the recommended range.

  • Page 44: What Am I Listening To

    If you happen to delete a user preset that is currently on-air, the name on the list will revert to <Empty>, but the processing setup will remain loaded in the DAVID IV, even through a pow- er cycle. If you delete a working preset by mistake in this man- ner, you can simply rename and save the on-air setup as de- scribed above.

  • Page 45: Proof" Mode

    ‘normalized’ (defeated), as explained ahead of the DAVID IV Specifications (Page 6). Keep in mind that today’s sophisticated DSP algorithms do much to mask the audible artifacts of aggressive audio processing; so much so, in fact, that laboratory measurements are a very poor reflection of how audible these artifacts are to listeners.

  • Page 46: Lost Password (Hard Reset)

    Enable the password when finished. times-out. Remember to To recover control of the DAVID IV if the password is lost, you Lost Password must do a “hard reset” of the unit. This is accomplished by...

  • Page 47: Section Iv - Networking The David

    LAN (Local Area Network). In fact, if you simply connect the DAVID IV to a router/server port on your network, all settings on the IP Settings screen should populate at once, as they did in the image above.

  • Page 48: Communicating From Outside The Local Network

    Internet. To make it easy to remember, we picked a default port number of 719, the formal model number of the DAVID IV. This may be changed from the IP Settings menu, however. Your router must be configured for ‘port forwarding,’ using Port 719 to forward both TCP and UDP traffic to the IP address specific to the DAVID IV.
  • Page 49 IP address if it were not for IP-forwarding providers available via the Internet. This service, free or at a very modest charge, will allow the DAVID IV to keep the provider apprised of its re- assigned IP address whenever that address changes. The IP- forwarding provider intercepts data attempting to connect with the DAVID IV and converts the IP address to the current one.

  • Page 50: The Network Status Screen

    This screen lists the DAVID IV network settings as explained below. Internal IP: Your DHCP router or server will assign an IP ad- dress to your DAVID IV, or in some cases this is done manually (Page 43). This is known as the internal IP address.

  • Page 51: Direct Computer Connection To The David Iv

    If your station does not have a local network you may still use the rear-panel NETWORK PORT connector to connect your DAVID IV directly to a PC, both for using the supplied setup and operating software to control the DAVID IV, and for per- forming firmware updates as they become available (Page 59).
  • Page 52 First, open your main networking page. This is found under Setting-up the Control Panel on most versions of Windows®. In the case of an ‘Imaginary’ this Windows XP machine it’s called Network Connections and Network shows what connections are available. This computer has a ‘Wi-Fi’...
  • Page 53 Once those numbers are entered, click: OK to save the setup and to close all open panes. We need to put the DAVID IV on this same imaginary network. DAVID IV Using the jog wheel in the manner described under...

  • Page 54: Section V - David Iv Remote-Control Software

    Microsoft Windows® (XP and later). It is provided on the CD-ROM that accompanies each DAVID IV, or may be downloaded from the Inovonics Website: www.inovonicsbroadcast.com/downloads. This software allows a user to adjust all setup and processing parameters from a remote location, and to back-up settings and hardware profiles off-site as well.
  • Page 55 DAVID IV software. Before starting the software utility, check to see that your com- Confirming puter and the DAVID IV are both connected to your local net- a Network work. Connection Using the front-panel jog wheel, navigate to: Setup / Network / Status.
  • Page 56 Also enter the default number 719 in the Port: field, unless you must address two DAVID-IV units behind a common external IP address (Page 44). If you have already protected the DAVID IV with a password (Page 41), then you must type that into the En- ter Password: box on the right.

  • Page 57: Remote Control Of The David Iv

    Now, if you navigate to: Setup / Network / Status on the DAVID IV, you will see your computer connected as shown here: REMOTE CONTROL OF THE DAVID IV...

  • Page 58: Presets

    The Presets tab shown in the foregoing snapshot duplicates the Presets DAVID IV front-panel Presets menu information, with the excep- tion that the preset ‘on air’ at the moment is named above the list rather than indicated with an arrow within the list as on DAVID IV front panel display.
  • Page 59 HD Radio delay adjustment appears only if the optional delay board has been installed (Page 32). All sliders and ‘radio buttons’ on these tabs reflect the DAVID IV menu-driven jog wheel adjustments, which have been explained in Section III.

  • Page 60: Profile And Preset File Management

    2. To duplicate settings for a backup DAVID IV or for associ- ated sites that want to sound the same. Click: File at the top of the software Saving a screen.
  • Page 61 Files may be ‘passed around,’ copied to a flash drive or attached to an e-mail, so that any pre- set may be imported into another DAVID IV that wants to have the same sonic ‘signature.’...
  • Page 62 Highlight the preset and click: Open. The saved pre- set will be added to the list, both on the software screen and on the DAVID IV display, but it will not immediately be selected as the on-air setting.

  • Page 63: Section Vi - Updating David Iv Firmware

    Firmware updates are bootloaded into the DAVID IV. bootloader is a simple software routine that runs on a PC con- nected to the DAVID IV. Refer to Section IV for specifics on in- terconnecting the DAVID IV to your computer, either over a LAN (network) connection (Page 43), or directly with a CAT5 ca- ble (Page 47).
  • Page 64 Updater will bring up this Information message advising that the Firm- ware Updater does not yet find the DAVID IV. Click: OK. This will start the Firmware Updater and display the main screen. This screen outlines the firmware update process in three easy steps.

  • Page 65: Firmware Update Files

    If for some reason the Firmware Updater cannot connect to the DAVID IV, and you have not yet initiated Step 2 to begin the update routine, even at this point, and with this message showing, you may power-cycle the DAVID IV as a last- ditch means of aborting the process and returning to the exist- ing version of the firmware.

  • Page 66: Notes And Doodles

    NOTES AND DOODLES — 62 —...

  • Page 67: 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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