Electronically-switched multifrequency generator with transducer

Details Electronically-switched multifrequency generator with transducer Electronically-switched multifrequency generator with transducer

1979-12-13

1982-10-05

Wolff, John H.

H04M 150

Patent

active

043529585

ABSTRACT:
In a multifrequency generator providing tone signaling for a telephone, the common switching functions are performed by solid state switching circuitry (1200). Improved signal transfer between the telephone line and transmit and receive transducer of the telephone is provided by arranging the solid-state transmit and receive switches (1201, 1401) in a gain configuration to increase the level of the speech signal. The tone signals are digitally synthesized and use an integrated R-C oscillator (600) as a reference. Button down and button up debouncing of a contact closure signal from a single contact per button keypad is provided.

REFERENCES:
patent: 4061886 (1977-12-01), Callahan, Jr. et al.
patent: 4132871 (1979-01-01), Lake
patent: 4196318 (1980-04-01), Nelson

Affiliated with

Also associated with

Rating

Electronically-switched multifrequency generator with transducer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronically-switched multifrequency generator with transducer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronically-switched multifrequency generator with transducer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-424210