Telephone answering apparatus having two integrators of differen

Details Telephone answering apparatus having two integrators of differen Telephone answering apparatus having two integrators of differen

1983-12-28

1987-02-03

Cardillo, Raymond F.

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379 79, 379105, H04M 164

Patent

active

046409904

ABSTRACT:
A telephone answering apparatus comprises a mechanical filter through which a received tone burst command signal is applied to a first integrator having a large time constant value for integrating the output signal of the mechanical filter to generate a continuous output signal during the reception of tone bursts. A second integrator having a small time constant value integrates the received command signal to generate an output signal having an envelope substantially identical to the envelope of the tone bursts. A coincidence gate is provided to generate a coincidence output when there is a match between the output signals of the first and second integrators.

REFERENCES:
patent: 3715518 (1973-02-01), Campbell et al.
patent: 4024348 (1977-05-01), Simizu
patent: 4192971 (1980-03-01), Morigami et al.
patent: 4196311 (1980-04-01), Hoven
patent: 4203007 (1980-05-01), Hatori et al.
patent: 4296277 (1981-10-01), Daneffel
patent: 4405833 (1983-09-01), Cave et al.

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