Discriminating means for telephone circuits

Details Discriminating means for telephone circuits Discriminating means for telephone circuits

1978-11-03

1980-07-15

Hecker, Stuart N.

H04M 174

Patent

active

042130123

ABSTRACT:
An electronic circuit for use with telephone instruments or the like in those cases where so-called "dial tap" is encountered, whereby a buzzer or bell included as part of the telephone instrument is adversely affected when the dial is rotated for purposes of dialing a particular call number. The circuit provides a discriminating function against the short term dial pulses by blocking them, but allows ringing current to pass substantially unaffected.

REFERENCES:
patent: 4152549 (1979-05-01), Ceruti et al.

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