Pulse or digital communications – Repeaters – Testing
Patent
1992-07-02
1995-01-24
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
3701102, 379418, H04B 1406
Patent
active
053848071
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.
REFERENCES:
patent: 4972466 (1990-11-01), Quesnel et al.
patent: 5054021 (1991-10-01), Epps
"40,32,24, 16kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)," CCITT Recommendation G.726, Geneva, 1990.
"MPT 1375, Common Air Interface Specification," Department of Trade and Industry, London, 1989.
"MC145532 ADPCM Transcoder Product Preview," In Motorola Telecommunications Device Data, DL 136, Rev. 2, Motorola, Inc., 1989.
"MC145554/MC145557/MC145564/MC145567 PCM Codec-Filger," in Motorola Telecommunications Device Data, DL 136, Rev. 2, Motorola, Inc., 1989.
"Motorola MC14410 2-of-8 Tone Encoder," in Motorola Telecommunciations Device Data, DL 136, Rev. 2, Motorola, Inc., 1989.
Bonet Luis A.
Corleto Jose G.
Floyd Michael D.
Yatim David
Chin Stephen
Motorola Inc.
Phan Hai H.
Polansky Paul J.
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