Detection of multifrequency tone signals

Devices, software and methods for passing DTMF signals under...

Dial pulse digit detector

Digital multifrequency signal receiver

Disabling tone detector for network echo canceller

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

DTMF signal receiving apparatus equipped with a DTMF signal judg

DTMF signal receiving circuit

DTMF signal receiving system

DTMF tone detection

Dual hysteresis signal detection circuit

Dual tone detector operable in the presence of speech or backgro

Dual-tone multifrequency (DTMF) signalling transparency for low-