Introduction to Digital Audio Coding and Standards - ISBN:1402073577

Introduction to Digital Audio Coding and Standards

Date: 22 April 2011, 12:09

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Analogue speech in electrical form has a history going back more than a century and a quarter to the early days of the telephone. However, interest in digital speech only gathered momentum sO,me telecommunications industry started a global project to digitize the telephone network. The technology trade-off of the time in this infrastructure-driven project led to a preference for adding transmission capacity over finding methods to reduce the bitrate of the speech signal so the use of compression technology for speech remained largely dormant. When in the late 1980s the ITU-T standard for visual telephony became available enabling compression of video by a factor of 3,000, the only audio format in use to accompany this highly compressed video was standard telephone quality 64 kb/s PCM. It was only where transmission capacity was a scarce asset, like in the access portion of radiotelephony, that speech compression became a useful tool.

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