Pulse or digital communications – Bandwidth reduction or expansion – Pulse code modulation
Patent
1997-12-15
2000-08-01
Vo, Don N.
Pulse or digital communications
Bandwidth reduction or expansion
Pulse code modulation
375242, 375244, H04B 166
Patent
active
060977604
ABSTRACT:
A data communications system includes a standard telecommunications apparatus (1) arranged to transport analogue signals in a form of Adaptive Differential Pulse Code Modulated (ADPCM) digital signals generated from Pulse Code Modulated (PCM) digital signals representative of the analogue signals. A mapping data processor (13) coupled to a source (14) of digital data and to an ADPCM encoder (3) of the standard telecommunications apparatus (1), generates PCM coded symbols representative of the digital data in accordance with a predetermined mapping function. An unmapping data processor (15) connected to an ADPCM to PCM decoder (10) of the apparatus (1) operates to re-generate the digital data from communicated PCM signals. The mapping and unmapping data processes are arranged in combination with the PCM and ADPCM encoding and decoding operations to provide a substantial increase in a rate of data communication, with respect to a data rate which would be achieved if the digital data were to be converted into analogue signals and fed to a PCM encoder of the standard telecommunications equipment.
REFERENCES:
patent: 5327461 (1994-07-01), Kushige
patent: 5384807 (1995-01-01), Yatim et al.
patent: 5559832 (1996-09-01), Laird
Roke Manor Research Limited
Vo Don N.
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