Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Tone detector and multifrequency receiver using said detector

Tone detector and multifrequency receiver using said detector

US Patent 4604713 · Granted Aug 5, 1986

Estimated economic value: $18,342,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Switching device for connecting a data transmission system to the telephone swit1990
Echo cancelling device for data transmission over two-wire lines1989
Echo cancelling device for data transmission over two-wire lines1989
Echo cancelling device with phase-roll correction1989
Echo cancelling device with phase-roll correction1989
Method and device for measuring phase jitter on a transmission channel1987
Method of cancelling listener echo in a digital data receiver, and device for im1986
Tone receiver for digital data communication systems1986
Method and apparatus for receiving a data signal modulated by means of a double 1984
Device for increasing the parallel inductance of a transformer1982
Method and device for effecting the initial adjustment of the clock in a synchro1982
Method and device for training an adaptive equalizer by means of an unknown data1982