Method and apparatus for detecting a prescribed audio frequency

Details Method and apparatus for detecting a prescribed audio frequency Method and apparatus for detecting a prescribed audio frequency

1994-04-01

1995-06-20

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 70, 379 77, 379 79, 379 80, 379 82, H04M 164

Patent

active

054266912

ABSTRACT:
An electrical apparatus, associated with a telecommunications line, includes a unique dual input/dual output prescribed audio actuating signal responsive circuit. The responsive circuit pursuant to a detection of the prescribed signal, in combination with a second signal pursuant to a detection by line pickup detection circuit of an off-hook condition of the telecommunications line, effecting production of an actuating output signal. The actuating signal upon suitable application, effecting an operational function of a suitably coupled associated electrical device. The associated device may be one of a number of electrical devices. In the preferred embodiment of the invention, this device is designated to be a time-day-date-stamp marker signal outputting device. The marker signal may then be recorded by a suitable recording device or, alternatively, not recorded but simply used as an audible time-day-date announcement clock.

REFERENCES:
patent: 5142564 (1992-08-01), Chu
patent: 5159626 (1992-10-01), Baum et al.

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