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| a Features * * * * * * MPEG 1 Audio Encode - Decode Software Solution for Video / Audio Applications Product Description The MPEG 1 Audio Encode-Decode Software solution is implemented on a single Analog Devices ADSP- 2181 Digital Signal Processor The three sampling frequencies - 3 Audio standards - 44.1 KHz, 48 Khz and 32 KHz are supported. Layer I and Layer II as well as the fixed bit rates and modes have been implemented. It performs compression/ decompression of audio in real time. The MPEG I Encode program accepts PCM audio in a memory buffer and generates the compressed data stream in another buffer. Similarly the MPEG 1 Audio Decode program accepts compressed data in a memory buffer and generates PCM audio in another buffer. The software is available in a library form and OEM users can integrate the solution with their code very easily. Implements the ISO / IEC 11172 - 3 MPEG 1 Audio Standard Supports fixed bit rates Supports the three sampling frequencies, 44.1, 48 and 32 khz Supports CRCC Software available in library form Easy integration with OEM's software Applications * * * * * Decoding for Video CD players Digital Broadcast Digital Studio Set Top Decoders Solid State Audio Recorder 32 Kbits/sec to 768 KBits/sec Frame & Unpacking CRC check 448 Kbits/sec Compressed A d udio Header detection PCM Audio FFT Sample D e equantisation Filter Bank Scale Factor, Scale Factor select information PCM Audio Inverse Filter Bank Psycho acoustic model Figure 1 -MPEG 1 Audio Decode Block Dynamic Bit allocation Coded Audio (32 Kbits/sec 448 to Kbits/sec) Linear quantize r Bit stream formatting, CRC check Figure 2 - MPEG 1 Audio Encode Block Rev. No. 0.01 Page 1 a Technical Specifications Standard supported Processor Encode MIPS Decode MIPS Program memory Data memory User Integration Demonstration of Solution ISO / IEC 11172 -3 Single ADSP 2181 30 16.5 14k 14k Library module that can be integrated by user ISA bus add-on card with demo application MPEG 1 Development Partner The MPEG 1 Audio Encode-Decode Solution was developed by Indchem Research and Development Labs. Ltd., and Analog Devices. a For more information please contact: Tel : +1 617 416 3060 Fax : +1 617 461 4360 E-Mail : system.solution@analog.com Rev. No. 0.01 Page 2 |
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