A/D, D/A Converter for PCM transmission system

Details A/D, D/A Converter for PCM transmission system A/D, D/A Converter for PCM transmission system

1980-05-23

1982-08-24

Swann, III, Glen R.

Pulse or digital communications

Repeaters

Testing

370100, 375 25, 375120, H04L 704

Patent

active

043464769

ABSTRACT:
A codec, utilized for an PCM transmission system, has an a/d and d/a converter, and a digital phase locked loop circuit. The digital phase locked loop circuit generates internal operation clocks, which are used for the a/d and d/a converting operations, by dividing the frequency of the applied external clocks by a value determined in accordance with the frequency ratio between frame pulses and the external clocks.

REFERENCES:
patent: 3505478 (1970-04-01), Kaneko
patent: 4019153 (1977-04-01), Cox, Jr. et al.
patent: 4180701 (1979-12-01), Louth et al.
patent: 4215430 (1980-07-01), Johnson, Jr.

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