Multi-frequency receiver circuits

Details Multi-frequency receiver circuits Multi-frequency receiver circuits

1977-06-15

1978-10-10

Claffy, Kathleen H.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78D, H04M 150

Patent

active

041198085

ABSTRACT:
A receiver circuit for a multi-frequency telephone dialling system has means for validating a received tone by making successive measurements of the tone period and validating the tone when m of n successive measurements lie within a single one of a number of given ranges and when, subsequently, l(< m) of n successive measurements of the tone also lie within that single range.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3760269 (1973-09-01), Beeman
patent: 3790720 (1974-02-01), Schartmann

Affiliated with

Also associated with

Rating

Multi-frequency receiver circuits does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multi-frequency receiver circuits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-frequency receiver circuits will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1767794