Discriminating means for telephone circuits

Details Discriminating means for telephone circuits Discriminating means for telephone circuits

H - Electricity

04

M

379/17, 379/30

H04M 1/26 (2006.01) H04M 1/74 (2006.01)

Patent

CA 1124906

ED-203 DISCRIMINATING MEANS FOR TELEPHONE CIRCUITS ABSTRACT OF THE DISCLOSURE An electronic circuit for use with telephone instruments or the like in those cases where so-called "dial tap" is encoun- tered, whereby a buzzer or bell included as part of the telephone instrument is adversely affected when the dial is rotated for pur- poses 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.

337892

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