Digital circuit and method for the detection of call progress to

Details Digital circuit and method for the detection of call progress to Digital circuit and method for the detection of call progress to

1982-03-19

1984-03-27

Pellinen, A. D.

Pulse or digital communications

Repeaters

Testing

179 84R, 375 94, H04M 100

Patent

active

044396392

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 devaluation logic circuit for determining the cadence of the received PCM signals.

REFERENCES:
patent: 4379347 (1983-04-01), Giradi et al.

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