Telephone having an audio response function

Details Telephone having an audio response function Telephone having an audio response function

1997-08-21

1999-10-05

Le, N.

Telephonic communications

Call signal generating

379 8801, 379387, H04M 300

Patent

active

059636394

ABSTRACT:
A microphone system is provided for picking up ambient sounds including noises and for producing a sound voltage signal. A threshold is obtained from the sound voltage signal for determining a response voice spoken by an addressee in response to the bell tone. A response sound voltage based on the response voice is compared with the threshold, and a response voice signal is produced when the comparison is established. In response to the response voice signal, a line of the telephone is closed.

REFERENCES:
patent: 3636458 (1972-01-01), Sugiyama et al.
patent: 5398281 (1995-03-01), Kurokawa et al.
patent: 5615256 (1997-03-01), Yamashita

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