LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF detector system and method which performs frequency domain

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF detector system and method which performs improved twist co

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF detector system and method which performs static and dynami

Telephonic communications – Supervisory or control line signaling – Substation originated

DTMF generating assistant

Telephonic communications – Supervisory or control line signaling – Substation originated

DTMF Generating assistant

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection

DTMF signal detection/removal using adaptive filters

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF signal receiving apparatus equipped with a DTMF signal judg

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF signal receiving circuit

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF signal receiving system

Telephonic communications – Supervisory or control line signaling – Signal receiver

DTMF tone detection

Telephonic communications – Supervisory or control line signaling – Signal receiver

Dual hysteresis signal detection circuit

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Dual signal triggered message waiting notification system for in

Telephonic communications – Supervisory or control line signaling – Signal receiver

Dual tone detector operable in the presence of speech or backgro

Telephonic communications – Supervisory or control line signaling – Signal receiver

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

Telephonic communications – Supervisory or control line signaling – Substation originated

Dynamic ordering of an electronic phonebook

Telephonic communications – Supervisory or control line signaling – Signal receiver

Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver

Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver

Efficient dynamic energy thresholding in multiple-tone...

Telephonic communications – Supervisory or control line signaling – Substation originated

Electric source circuit for telephone sets