The DAVID IV is the fourth generation in our DAVID (vs. Goliath) series of FM and digital air-chain processing systems. This streamlined DSP-based design gives broadcasters total leverage over the most important sonic ‘signature’ parameters, and the ease of control to optimize audio quickly and effectively. Processing includes 5 bands of dynamics compression and equalization, intelligent gain-riding AGC (Automatic Gain Control), sub-bass and stereo field enhancements, and our proprietary PIPP™ (Polarity Independent Peak Processing) limiter. The DAVID IV combines audio processing with a high quality FM stereo generator that also includes internal metering and combining for the RDS/RBDS RadioData subcarrier.
Setup is quick, and operation is intuitive via the front-panel interface or included remote PC software. Presets are provided for popular world formats*, and user settings can easily be saved/backed up and shared over station networks. TCP/IP connectivity is virtually automatic and allows full remote control and access from anywhere in the world. Processing and stereo generator aside, the DAVID IV features a rugged closed box design (no fans or heat-sinks needed), with ultra low latency hardware allowing for direct off-air monitoring, and power to live audio in less than 1 second.
But how does it sound? When it comes to audio performance, the DAVID IV really delivers. With tight lows, open mids, crisp but controlled highs, and the dynamic flexibility to really stand out, the DAVID IV’s sound promises results on par with products more than double or triple it’s price class. It has never been easier (or more affordable) to achieve maximum audio performance without breaking the budget.
Ultra low latency, all-digital DSP based design.
5 bands of adjustable dynamic range compression and 'graphic-EQ' .
Adjustable gain-riding AGC with "intelligent" gating.
Low-bass enhancements with independent 'Rumble' and 'Punch' adjustments.
Stereo field processing to adjust the listening sound stage.
Programmable high-pass function eliminates modulation-robbing sub-bass frequencies.
Inovonics' proprietary PIPP™ (Polarity Independent Peak Processing) limiter ensures maximum carrier density.
AES3 digital input and outputs(XLR), accepting sampling rates of 32kHz, 44.1kHz, 48kHz, 96kHz.
Left/Right analog inputs and outputs (XLR) and multiple independent Composite MPX outputs.
'Adaptive pre-emphasis' high-frequency limiting for FM.
Easy setup and control via the front panel, and remote access control that conforms to TCIP/IP protocols.
Built in Stereocoder (Stereo-Gen) with internal RDS metering and combining.
25 factory presets optimized for popular radio formats included, and 20 customizable user
presets that can be downloaded and shared as small files.
Composite/MPX Output: ±0.25dB, 20Hz–15kHz through an appropriate de-emphasis network with processing defeated.
L/R Line Outputs: As above in FM mode; ±0.25dB, 20Hz–20kHz in ‘Flat’ mode with processing defeated
Noise: Residual noise in all analog outputs is better than 70dB below 100% carrier modulation. Digital outputs have residual noise better than 85dB below 100% carrier modulation with digital program sources.
Distortion: <0.05% THD in digital and analog outputs with all processing normalized (defeated). Distortion in typical operation will be affected by user settings.
Stereo Separation: >85dB using line inputs and outputs; >55dB, 20Hz–15kHz in composite/MPX output.
Program Signal Latency: ≤4.2milliseconds.
DIGITAL LINE INPUT
The AES3 stereo input (XLR) accepts program sources at sampling rates of 32kHz, 44.1kHz, 48kHz and 96kHz; 16/24-bit. Accommodates program peak input levels between –15dBFS and 0dBFS.
ANALOG LINE INPUTS
L/R active balanced/bridging (XLR) inputs accept nominal program line levels between
–15dBu and +15dBu.
DIGITAL LINE OUTPUT
The AES3 (XLR) stereo output may be adjusted between –15dBFS and 0dBFS, corresponding to 100% carrier modulation. The output sampling rate may be set to follow the digital line input or forced to 32kHz, 44.1kHz, 48kHz or 96kHz. Sampling resolution is 24 bits.
ANALOG LINE OUTPUTS
Active balanced (XLR) outputs are adjustable between –20dBu and +10dBu, corresponding to 100% carrier modulation; source impedance is 200 ohms.
COMPOSITE / MPX OUTPUT
Two unbalanced (BNC) outputs are independently adjustable between 0.8V p-p and 8V p-p, corresponding to 100% carrier modulation; source impedance is 75 ohms.
Unbalanced/bridging (BNC) input accepts a 57kHz RDS subcarrier at any level between 0.5V p-p and 5.0V p-p for a typical injection level of 5% carrier modulation.
19kHz RDS SYNC
Output (BNC) delivers a 5V p-p TTL-compatible square wave at the 19kHz pilot frequency; 75-ohm source.
An RJ45 jack accepts TCP/IP network connections for remote setup and operation of the DAVID IV.
HEADPHONE JACK (Front Panel)
A quarter-inch TRS headphone jack allows the user to monitor the processed program audio. A volume control next to the jack adjusts the listening level.
AUDIO PROCESSING FEATURES
A user-programmable high-pass filter attenuates sub-audible noise that could compromise modulation efficiency. The filter is adjustable between 20Hz and 65Hz.
Intelligent, gated ‘gain-riding’ AGC is quasi-average-responding with a capture/correction range of ±18dB. Positive AGC gain may be truncated to any value between 0dB and +18dB, and the correction rate of the AGC is programmable.
This dual-action utility effectively broadens the soundstage for both the stereo program and for the center-channel ‘solo’ component independently.
Program audio is split into five frequency bands. Each band imparts both dynamic compression and adjustable static gain to afford fixed equalization and other ‘signature’ control of the program audio.
Sub-bass program frequencies undergo independent dynamic compression, expansion, selective clipping and filtering for control over both static ‘Rumble’ and dynamic ‘Punch’ of bottom-end components.
PIPP™ PEAK LIMITER
Inovonics’ exclusive Polarity- Independent Peak Processor assures optimum modulation of the FM carrier or other delivery channel.
Fast HF limiting and distortion-cancelled clipping are utilized to best advantage in providing independent amplitude control of program frequencies subjected to FM pre-emphasis. This helps preserve program brightness and clarity despite power bandwidth constraints inherent in FM broadcasting.
At the user’s discretion, up to 3dB of clipping may be applied to the composite/baseband signal. Clipping is performed before the injection of the stereo pilot and RDS subcarrier.
THE USER INTERFACE
A front-panel graphic display and jog wheel allow easy, menu-guided in-situ setup and operation of the DAVID IV. LED-bar displays indicate in/out levels and audio processing action.
The IP network port and supplied software allow remote setup and operation of the DAVID IV over a local network or the Internet using any Windows® PC (XP or later).
105-130VAC or 210–255VAC, 50/60Hz; 8 watts.
SIZE AND SHIPPING WEIGHT
23” x 16” x 1.75” (1U); 8 lbs
584mm x 406mm x 51mm ; 3.6 kg
23” x 16” x 1.75”
584mm x 406mm x 51mm
Additional Product Photos