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Inovonics David IV FM HD Audio Processor
FM/HD Audio Processor

BSW PART: DAVID-IV

DAVID-IV facedavid ivdavid iv
Click here to download the new V.3 David IV firmware update! Get the new added features you have been asking for!

The Inovonics 719 DAVID-IV offers comprehensive audio processing, including gain-riding AGC, 5 bands of dynamics compression and equalization, stereo enhancement and sub-bass augmentation, as well as Inovonics' patented PIPP limiter.

Processing is integrated with a high-performance stereocoder (Stereo-Gen) that includes active and metered RDS combining. The DAVID-IV can accept analog and AES-digital inputs, and has two separate composite/MPX outputs in addition to both analog and AES-digital line outputs. The line outputs can be configured for either FM or digital-radio transmission characteristics.

The DAVID-IV may be set up and controlled using the intuitive front-panel graphic display and jog wheel, or connected directly to a network for full TCP/IP control over all parameters with a PC and supplied software.

Factory presets for processing popular radio formats are included, and user presets are easily downloaded and saved as small files. These may then be uploaded to other DAVID-IV processors in a group-ownership situation. 

Inovonics 719 DAVID-IV Features:
• 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
• Factory presets for processing popular radio formats included and user presets are easily downloaded and saved as small files 

For detailed information, see the Inovonics 719 David IV Owners Manual.



SPECIFICATIONS
 

GENERAL PERFORMANCE

Frequency Response

• 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.

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. 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.

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% carrier modulation.

19kHz RDS SYNC
• Output (BNC) delivers a 5V p-p TTL-compatible square wave at the 19kHz pilot frequency; 75-ohm source.

NETWORK PORT
• 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


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.

THE USER INTERFACE

FRONT-PANEL
• 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.

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).

 

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