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A 60 Channel PCM-ADPCM Converter

1982; Institute of Electrical and Electronics Engineers; Volume: 30; Issue: 4 Linguagem: Inglês

10.1109/tcom.1982.1095504

2162-2132

J.-M. Raulin, G. Bonnerot, J.-L. Jeandot, R. Lacroix,

Control Systems and Identification

Coding techniques based on adaptive linear prediction and quantization are well suited to signals carried by telephone channels and can provide, with a per channel rate of 32 kbits/s, a level of quality compatible with the specifications of the conventional 64 kbit/s rate. The ADPCM technique described in this paper features a simple adaptive quantization scheme and a tenth-order linear prediction adaptive filter realized as a cascade of five second-order sections. Besides superior performance characteristics, the nonaccumulation of degradations in tandem connections is achieved. The implementation is a 60 channel PCM-ADPCM converter, called TMN 162. It is a fully digital equipment which offers a doubling of the capacity of digital links in telephone networks.