ADPCM transcoder with integral tone generation and method therefor
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
Jul 2, 1992
filing date -
Jul 2, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ADPCM transcoder (60) includes an integral tone generator (65) which inserts a linear tone signal, such as a conventional DTMF tone signal, into either the transmit or receive data stream, or both. A digital PCM input signal is first converted to a first linear signal. If tone generation is enabled for transmission, then the linear tone signal is substituted for or added to the first linear signal and provided to an ADPCM encoder (63), which provides an ADPCM output signal in response. An ADPCM decoder (66) receives an ADPCM input signal and provides a second linear input signal in response. If tone generation is enabled for reception, then the linear tone signal is substituted for or added to the second linear input signal, and converted to a digital PCM output signal. The ADPCM transcoder (60) may also be integrated with other components of a signal processing system.
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