Four Channel Digital Audio Processor Expansion Card

for use with DCR-972/974 DigiCeiver^®

Model DAP-104

Introduction

The DAP-104 is a digital audio processor expansion card for ICP's Models DCR-972 and DCR-974 DigiCeiver^® data/audio receivers. These cards are utilized when expansion with high quality audio capability is required in either data receiver. Both cards utilize ISO/MPEG Layer II coding and can provide mono, dual mono, stereo or joint stereo from a single digital stream up to 384 kbps.

The DAP-104 card contains two decoders providing up to four channels of audio. Each decoder provides a single RS-232 async data output at standard rates from 300 baud up to 19.2 kbps and four remotely controlled, opto-isolated, switch closures and an AES/EBU output.

The DCR-972/974 DigiCeiver^® is a multi-function satellite broadcast receiver. To add audio capability, the DCR-972/974 chassis has two expansion slots which can accommodate up to two of the DAP-104 four channel cards. All cards are plug compatible with the expansion slots and are field insertable. Once installed, final operating configuration parameters are downloaded either over-the-network or through the receiver remote control port by the Network Control System (NCS). Audio outputs may be authorized or de-authorized at any time via in-band commands from the NCS. In addition to the basic data capability, a fully configured DCR-972/974 Chassis can provide a total of eight analog audio outputs, four RS-232 async data outputs, sixteen switch closures and four AES/EBU outputs.

Specifications

System Characteristics

Channel Data Rates

64, 128, 192, 256, or 384 kbps

Audio Coding

MPEG 1 & MPEG 2, Layer II

Network Control

Provided by the ICP NCS system

Ancillary Data

Provides async data at standard rates from 300 baud up to 19.2 kbps. This channel is transmitted within each digital audio stream.

Switch Closures

Four remotely controlled switch closures (opto-isolated) provided with each decoder. Decoder authorization via in-band commands from the NCS.

Audio Performance

Audio Modes

ISO/MPEG Layer II audio modes including: Mono, Dual Mono, Stereo, Joint Stereo

Audio Bandwidth

20 Hz to 7.5, 11, 14.5, or 20 kHz depending on the mode of operations

Audio Response

Typically ±0.2 dB depending on the mode of operations

Dynamic Range

Typically 85 dB (A weighted). Option for 95 dB (A weighted) is also available

Peak Level

Clipping level is +18 dBu

Analog Output Interface

Electronically balanced, differential, analog output is provided

Output Impedance

Typically 50 Ohms (differential)

Digital Output

AES/EBU digital audio output is optionally available

Physical Characteristics

Package Type and Size

Plug-in printed circuit board, approximately 7.2" x 7.2"

Electrical Power

Supplied by the receiver

Audio Output Connectors

Analog and digital outputs provided by 9 pin "D" type connectors

Switch Closure and Ancillary Data Connector

25 pin "D" type connectors

Specification Subject to Change Without Notice