Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform

Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform

US Patent 6370244 · Granted Apr 9, 2002

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Auto-calibration systems and methods for reducing amplifier offset2025
Pin encoded mode selection system2021
Method and apparatus for controlling a multichannel TDM device2021
Method and apparatus for controlling a multichannel TDM device2019
Method and apparatus for controlling a multichannel TDM device2017
Multichannel digital audio interface2016
Adaptive frequency synthesis for a serial data interface2015
Audio output driver for reducing electromagnetic interference and improving audi2014
Gain control module and applications thereof2014
Digital to analog converters with adjustable output resolution2014
Adaptive frequency synthesis for a serial data interface2013
Low voltage electrolysis of water2013