Inovonics David IV Installation & User Manual
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Inovonics David IV, — 50 — Section V DAVID IV REMOTE-CONTROL SOFTWARE GENERAL DAVID IV remote-control software consists of a lightweight in- stallation utility that runs under 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. This is invaluable if, for ex- ample, the DAVID IV is on a lonely mountaintop. Changes made via software are immediately
Inovonics David IV, — 45 — What is Dynamic DNS? Most DSL and TV - cable connections to the Internet are subject to ‘dynamic’ IP assignments. As described earlier, a router or server working in the DHCP mode makes efficient use of lim- ited IP address possibilities by reassigning them as devices dis- connect from the network. An Internet Service Provider (ISP) uses this same technique on their clients’ primary external-IP (Web) addresses. Thus the incoming routing path to your DAVID IV may well change from time to time, perhaps daily. It would not be possible to addr
Inovonics David IV, — 22 — 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. Stereo Width The Stereo Width slider incre ases the perceived width of the soundstage, which is that area between the listener’s left and right loudspeakers. Increasing Stereo Width makes the stereo ‘wider,’ exaggerating the stereo effect even to th
— 32 — COMPOSITE CLIPPING Navigate to: Processing / Composite Clipper: At the user’s discretion, up to 3dB of composite clipping may be introduced. This is brute-force, flat-topped clipping of the baseband signal, but before the 19kHz stereo pilot and RDS subcarrier (if used) are added. Baseband clipping invariably in- troduces harmonic components that ‘c
Inovonics David IV, — 13 — 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. Alternatively, an FM mode is included for feeding an FM exciter with a built-in stereo generator, in which case the outputs may assume a pre-emphasized or a normalized (flat) frequency characteristic, both FM options with full benefit of independent HF limit
Inovonics David IV, — 18 — Turn the jog wheel to position the brackets around either the Digital or the Analog audio input, and then press the jog wheel to confirm and save the selection. SETTING INPUT GAIN Importance of AGC Action The DAVID IV has an intelligent AGC (Automatic Gain Control) that effectively ‘rides gain’ on the input signal. The AGC has a capture range of ±18dB, meaning that the input signal can wander aimlessly over this range and be automatically correct- ed to the proper level. AGC gain is shown by a front-panel LED bargraph. AGC has been designed for symmetrical correction around a resting-point of 0dB (unity) gain. It will bring up
Inovonics David IV, — 20 — 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” characterizes the sonic signature or nearly all contemporary music stations. Navigate to: Processing / High Pass Filter: Once you have arrived at this menu push the jog wheel to enter the adjustment mode. Then as you turn the jog wheel the
Inovonics David IV, — 35 — Normalized (Flat) FM Output The FM - Flat output characteristic is similar to FM - Pre , e x- cept that the signal has been ‘normalized’ with a de-emphasis network to restore a flat frequency characteristic. This output would be the proper feed to an FM exciter that does its own pre-emphasis. Although the audio response from this output is flat, it still includes the 15kHz low-pass filter and independent HF limiting to protect the spectrum and the stereo pilot, plus it will also have the HD Radio delay if it is enabled. Output Level Controls The Digital Level and Analog Level output sliders vary the lim
Inovonics David IV, — 1 — TABLE OF CONTENTS Section I – INTRODUCTION DAVID IV PRODUCT DESCRIPTION ............................................... 5 Features DAVID IV TECHNICAL SPECIFICATIONS ........................................ 6 General Performance Rear-Panel Appointments Audio Processing Features The User Interface Miscellaneous BLOCK DIAGRAM ............................................................................. 9 Section II – INSTALLATION GENERAL ........................................................................................ 10 Menu Na
Inovonics David IV, — 19 — 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. These meters may have floppy mechani- cal movements or take the form of LED and other bargraph readouts, or can even be on-screen computer displays. Standardized or not, all these devices have their own response to, and provide their own representation of, program peak and average le
Inovonics David IV, — 15 — Section III 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. This section addresses the various subsections of the DAVID IV in the general signal-path order indicated by the Block Diagram on Page 9. As stated on that page, the Block Diagram does not necessarily reflect the actual signal path or order of audio pro- cessing stages.
Inovonics David IV, — 56 — 3. Type a value directly into the window and then press Enter (or click anywhere on the screen) to set that value. 4 Or you may click any slider and use the mouse scroll wheel as a ‘virtual knob’ to increment or decrement the value. PROFILE AND PRESET FILE MANAGEMENT Although the DAVID IV has a non-volatile memory that saves all setup parameters and user presets, the software interface in- cludes a utility for saving this information on your computer as any number of small files. There are a couple of good reasons for backing-up these settings as a matter of routine course: 1. Emergency backup to restore your settings in a
Inovonics David IV, — 61 — bly certain that the DAVID IV and your computer are ready to connect properly, select: Yes in the next two menus, paying close heed to the warnings in each. When the DAVID IV is ready to accept the firmware update it will display this message. Next, click: Find All Devices at the top of the computer screen. The IP address of your DAVID IV should appear in the Select: field, confirming that you are properly connected. If you do not see the IP address of your DAVID IV, abort the update (de- scribed below) and troubleshoot connection issues. You may always use the DAVID IV PC software to test t
— 16 — There is, of course, some interaction between the two general groupings of DAVID IV adjustments. The processing sections depend on proper levels at the input, and output levels will be ambiguous unless the processing has been set up properly. Keep this in mind through the following guide, as it is arranged more-or-less in signal-path order. Back
Inovonics David IV, — 21 — The AGC stage of the DAVID IV has been carefully e n gineered for intelligent response to program material, taking into ac- count both the peak and average values of the audio signal . The only justification for turning AGC off is for test purposes, or if the user is 100% confident that the board operator is dili- gent in riding the gain manually (fat chance!). Even in the latter instance, trust the AGC to know best what downstream pro- cessing stages want to see. AGC Correction Rate A ‘normal’ correction rate of the AGC is 5 on the scale ,
Installation & Operation User Guide DAVID IV Model 719 FM Audio Broadcast Processor August, 2012 Firmware Rev. 2 Software Rev. 2 Inovonics, Inc. 5805 Highway 9 Felton, CA 95018 Tel: (831) 458-0552 Fax: (831) 458-0554 Register online at www.inovonicsbroadcast.com PRODUCT REGISTRATION RECORD Model 719 – Serial No. _______________ Purchase Date _____________________
— 40 — at the very top of the list. Push the knob to bring up the name- entry area, as shown here. Turn the knob to highlight numbers and letters in the character set. Turn-and-push to enter a name for the preset you have created; that is, the one playing on-air right now. Space puts a blank between words and Backspace lets you correct errors. When you have a name entered, hig
— 53 — Click: Connection at the top of the soft- ware screen to display the drop-down menu shown at the right. Clicking: Connect here is the same as clicking on the box down below, and clicking: Dis- connect will do just that. Checking the box beside: Connect On Startup will make software connection automatic from now on, each time the software is launched.
Inovonics David IV, — 57 — Recovering and reloading a profile back into your DAVID IV, or another unit, is simply the reverse of this process. Click: File / Load Profile from File, navigate to the proper folder, high- light the file you have saved and click: Open. The profile will be uploaded to the software screen and into DAVID IV firmware. WARNING : A profile upload will overwrite the current (on air!) settings resident in the DAVID IV! Saving a Preset User p resets are ‘ saved ’ ( actually exported and imported ) in
Inovonics David IV, — 38 — The exact setting of this control will depend on the input sensi- tivity of your exciter (or STL transmitter) and the desired peak carrier modulation you wish to achieve. Use your mod-monitor to check the off-air signal when making this adjustment, and be sure that audio processing setup has been completed to your satisfaction before fine-tuning the output level. Multiplex Output Servo T he DAVID IV employs an open - loop se r vo system to maintain the multiplex output at the precise level set by the user. As ei- ther the 19kHz stereo pilot level or the RDS injecti
Inovonics David IV, — 17 — Jog Wheel and Back Button T urn the jog wheel to cycle among highlighted menu items, and then push the jog wheel to select or adjust the highlighted item . The Back button returns you to the previous menu. Push the Back button repeatedly to return to the Main Screen. In all setup instructions given here, the menus will be shown as a string of commands. As an example, starting at the Main Screen: Setup / Stereo Generator / RDS Input / RDS Injection would direct you to do the following: 1)
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