Digital call progress tone detection method with programmable di
Digital communication translator
Digital composite tone alerting
Digital multifrequency signal receiver
Digital tone generator
Digital tone generator
Digitally controlled ring signal generator
Digitally controlled ringer signal generation
Disabling tone detector for network echo canceller
Disconnect signalling detection arrangement
Display device
Display telephone with transducer
Distinctive ringing and distinctive call-waiting tones in an ISD
Distinctive telephone annunciator
Double duty capacitor circuit and method
DTMF detection having sample rate decimation and adaptive tone d
DTMF detector for detecting DTMF signals using a digital signal
DTMF detector system and method which performs frequency domain
DTMF detector system and method which performs improved twist co
DTMF detector system and method which performs static and dynami