Inovonics 719N DAVID IV FM/HD 5 Band Radio Broadcast Audio Processor.

The DAVID IV 719N is the fourth generation processor in our DAVID (vs. Goliath) series of FM and HD Radio™ air-chain processors. Our streamlined, 100% DSP-based audio engine gives you total leverage over the most important sonic ‘signature’ parameters, while smart controls allow you to enhance program material quickly and effectively.
Processing includes 5 bands of dynamics compression with equalization, intelligent gain-riding AGC (Automatic Gain Control), Bass and Stereo Field Enhancements, and our proprietary PIPP™ (Polarity Independent Peak Processing) limiter.

Processing is integrated with a high-performance stereo generator, featuring multiple independent level outputs, and an RDS sync with active and metered internal combining.
Also included are 25 factory presets optimized for popular contemporary world formats and 20 customizable user presets that can easily shared over station networks.
The DAVID IV 719N may be set up and controlled using the intuitive front-panel menu display and jog wheel, or through an intuitive Network Web GUI.

DAVID IV Rear Panel Appointments

The processor can accept analog and AES-digital inputs, and along with its independent composite/MPX outputs, both analog and AES-digital line outputs run simultaneously. These outputs can be configured for either pre-emphasized analog FM or 20khz-flat digital and analog audio formats, providing ideal integration options for just about any station or studio setup.

The DAVID IV may be set up and controlled using the intuitive front-panel menu display and jog wheel, or connected directly to a network for full remote TCP/IP control over all parameters via the supplied software. Field upgradable firmware updates take only seconds to do and are free forever.

DAVID IV Remote Software

One of the incredible benefits of the ground-up design is speed: The DAVID IV boasts a latency of only 4.2ms from any input to any output, in any mode, and boots or power-cycles to live audio in under 1 second. This enables better live monitoring for DJ’s and on-air talent, and reduces downtime in the event of power failures.
How does it sound?

With tight lows, open mids, crisp but controlled highs, and the dynamic flexibility to really stand out, the DAVID IV delivers audio on par with products more than double and triple it’s price class. Combine that with setup and controls that anyone – and we mean anyone – can use, mean it’s never been easier (and more affordable) to achieve maximum audio performance without breaking the budget

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.

AUDIO PROCESSING FEATURES

PROGRAM HGH-PASS:A user-programmable high-pass filter attenuates sub-audible noise that could compromise modulation efficiency. The filter is adjustable between 20Hz and 65Hz.

AGC: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.

STEREO ENHANCEMENT:This dual-action utility effectively broadens the soundstage for both the stereo program and for the center-channel ‘solo’ component independently.

5-BAND ‘MULTIPRESSOR: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.

BASS AUGMENTATION: 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.

ADAPTIVE PRE-EMPHASIS: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.

COMPOSITE CLIPPING: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.

SOFTWARE CONTROL: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).

Highlights:

• Intuitive, menu-driven set-up and IP interface for remote Web access and control
• 25 factory presets and 20 customizable presets
• IP connectivity for SNMP monitor and control
• Streamlined 4th Generation DSP-based audio processor
• AES3 digital input and outputs(XLR), accepting sampling rates of 32kHz, 44.1kHz, 48kHz, 96kHz, 192kHz.
• Left/Right analog inputs and outputs (XLR).
• Adjustable gain-riding AGC with “”intelligent”” gating.
• 5 bands of adjustable dynamic range compression.
• 5-bands of ‘graphic-EQ’ adjustment.
• Low-bass enhancements with independent ‘Rumble’ and ‘Punch’ adjustments.
• Stereo enhancement processing to adjust the listening sound stage.
• ‘Adaptive pre-emphasis’ high-frequency limiting for FM.
• Remote access and control conforms to TCIP/IP protocols
• Built in Stereocoder (Stereo-Gen) with internal RDS Combining.
• Programmable high-pass function eliminates modulation-robbing infrasonic energy.
• 25 Factory presets for processing popular radio formats included and 20 user presets are easily downloaded and saved as small files.

Frequency Response

• Composite/MPX Output:±0.25dB, 20Hz–15kHz assuming the use of a lab-quality FM-multiplex decoder with the appropriate de-emphasis characteristic.
• L/R Line Outputs:±0.25dB, 20Hz–15kHz through an appropriate de-emphasis network in the FM mode; ±0.25dB, 20Hz–20kHz in the Flat mode.
• AES Digital Output (Digital Input):±0.25dB, 20Hz –15kHz through an appropriate de-emphasis network in the FM mode; ±0.1dB, 20Hz–20kHz in the Flat mode

Noise (unweighted):

• Composite/MPX Output:SNR >85dB with carrier modulation at maximum output level through an appropriate de-emphasis network.
• L/R Analog Line Outputs:Residual Noise better than 100dB below the output clipping point(through an appropriate de-emphasis network in the FM mode).
• AES digital Output (Digital Input):Residual noise better than 130dB below 0dBFS (through an appropriate de-emphasis network when indicated.

Distortion:

• Composite/MPX Output:<0.01% THD using an appropriate de-emphasis network.
• Line Outputs:<0.06% THD in digital and analog Line Outputs using an appropriate de-emphasis network when indicated.

Stereo Separation:

• Composite/MPX Output:>65dB, 20Hz-15kHz assuming the use of a lab-quality FM-multiplex decoder with the appropriate de-emphasis characteristic. Linear Crosstalk (main/sub or sub/main):.78dB.
• L/R Analog Line Outputs:At 1dB below the output clipping level, >100dB through an appropriate de-emphasis network in the FM mode; unweighted in the Flat mode.
• AES Digital Output:At 0dBFS, >130dB through an appropriate de-emphasis network in the FM mode; unweighted in the Flat mode (using the Digital Line Input).

Program Signal Latency:

≤4.2 milliseconds, any input to any output in any operating mode.

19kHz Stereo Pilot Protection:

>65dB with reference to 9% pilot injection.

38kHz Suppression:

>80dB with reference to 100% carrier modulation.

57kHz RDS Subcarrier Protection:

>65dB with refernce to 5% RDS sub-carrier injection.

REAR PANEL APPOINTMENTS

Digital Line Input:

The AES3 stereo input (XLR) accepts program sources at sampling rates of 32kHz, 44.1kHz, 48kHz and 96kHz; 16/24-bit. Input gain is adjustable for average program levels between -5dB and -35dB, re: -20dBFS.

Analog Line Inputs:

L/R active balanced/bridging (XLR) inputs accept average program line levels between -15dBu and 15dBu; 26dBu max peak level.

Line Outputs:

The Digital and Analog Line Outputs may each be configured independently for 20kHz flat response, or for 15kHz ‘FM’ characteristics, either with pre-emphasis or normalized to flat.

Digital Line Output:

The AES3 (XLR) stereo output may be adjusted between -20dBFS and 0dBFS, corresponding to 100% (peak) carrier modulation. The output sampling rate may be set to follow the Digital Line Input or forced to 32kHz, 44.1 kHz, 48kHz or 96kHz. Sampling resolution is 24 bits.

Analog Line Outputs:

Active balanced (XLR) outputs are adjustable between -10dBu and 24dBu ( 21.5dBm), 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 ( 11dBu), corresponding to 100% carrier modulation; source impedance is 75 ohms. Pre-emphasis may be set to 75μs, 50μs or OFF.

RDS Input:

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% of total carrier modulation.

19kHz RDS Sync:

When RDS is enabled, the Sync Output (BNC) delivers a 5V p-p TTL-compatible square wave at the 19kHz pilot frequency; 75-ohm source.

Network Port:

A 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.