Pulse or digital communications – Repeaters – Testing
Patent
1983-08-30
1985-09-03
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
364571, 364719, 179 84VF, 381107, G06F 1536, H03H 1700
Patent
active
045396922
ABSTRACT:
A digital tone detector circuit characterizes the received PCM encoded signals as one of a plurality of call progress tones, voice signals or silence. The PCM signal is linearized and normalized to a predetermined level in a digital automatic gain control circuit which also provides a signal corresponding to the level of the input signal. A first circuit is responsive to the linear signal for providing a count of the zero level traversals incurred by the linear signal. An envelope detector circuit is also responsive to the linear signal for providing a signal representing the envelope frequency thereof. The composite results corresponding to the signal level, the zero-level traversal count, and the envelope frequency are translated in an evaluation logic circuit to provide an output signal representing the identity of the input PCM signal. A microprocessor is responsive to a plurality of the output signals from the evaluation logic circuit for determining the cadence of the received PCM signals.
REFERENCES:
patent: 4031630 (1977-06-01), Fowler
patent: 4315319 (1982-02-01), White
patent: 4356731 (1982-11-01), Mahoney
patent: 4453258 (1984-06-01), Richardson
Northern Telecom Limited
Safourek Benedict V.
Turpin F. P.
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