Analog-digital code converter in a digital telephone switching s

Details Analog-digital code converter in a digital telephone switching s Analog-digital code converter in a digital telephone switching s

1977-07-13

1979-03-06

Stewart, David L.

179 15A, 179 15AT, 179 15BV, 179 15BY, H04J 316

Patent

active

041432428

ABSTRACT:
An analog-digital code converter in a digital telephone switching system is disclosed wherein when an analog voice signal from an analog line is applied to an analog per line unit it is sampled at a high rate and a high speed sampling digital code produced by .DELTA.M-PCM modulation is converted to a low speed sampling digital code through a digital filter provided in a common unit for application to a time division digital speech path switch, and when a wide band broadcasting service signal from the same analog line is applied to the analog per line unit, a path is provided between the analog per line unit and the time division digital speech path switch which path bypasses the digital filter without allowing the conversion of the high speed sampling digital code of the analog per line unit to the low speed sampling digital code, whereby wide band communication as well as ordinary speech band communication are attained.

REFERENCES:
patent: 2920143 (1960-01-01), Filipowsky
patent: 3701851 (1972-10-01), Starrett
patent: 4013842 (1977-03-01), Kao
patent: 4021616 (1977-05-01), Betts

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