Voice compression for digital networks Feldt, Terry

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Feldt, Terry
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High Technology
Business; Computers and office automation industries; Data compression
General; Trade
The telephone network in the US is being shifted from an analog to a digital system. The digital system will be able to handle all types of traffic from digitized voice and video to computer data. Telephone companies aim for cost-effectiveness by applying digital compression techniques which reduce bandwidth requirements while simultaneously maintaining acceptable voice quality. The most commonly used present technology is called pulse code modulation (PCM) and requires a 64-Kbit per second transmission channel. A new more efficient refinement, called adaptive differential PCM (ADPCM), halves that transmission rate, and has been accepted as an international standard for digital voice transmissions. Some degradation problems are occurring since many currently installed switches can only handle PCM transmissions. This means that many translations from PCM to ADPCM and vice versa occur in a long distance transmission. This problem will gradually disappear in coming years as the telephone network's transition to all-digital transmission is completed.
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