Signal coding for telephone communication system

Details Signal coding for telephone communication system Signal coding for telephone communication system

H - Electricity

04

J

363/15

H04J 3/00 (2006.01) H03M 7/00 (2006.01) H04B 14/06 (2006.01)

Patent

CA 1065069

Abstract A telephone communication system includes digital apparatus for reversibly converting adaptive delta modulated (ADM) signals over communication paths between a subscriber switch and a central office to pulse code modulated (PCM) signals compatible with commercial telephone equipment. Incoming ADM signals are converted to linear PCM (LPCM) signals having an approximately 56 KHz rate by means of a ADM/LPCM converter circuit which detects patterns of the ADM signals to provide pattern controlled digital signals to a converter circuit. The converter circuit in turn generates LPCM increment signals. LPCM increment signals are then added to produce LPCM signals at a 56 KHz rate. A speed converter samples the 56 KHz LPCM signals to produce 8KHz LPCM signals. The 8 KHz LPCM signals are then converted to conventional CPCM signals for use over the telephone network. Circuitry is also provided for performing the reverse operation of converting from CPCM signals to ADM signals.

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