LandOfFree - US Patents - Listing for Telephonic communications,Substation or terminal circuitry

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Digital telephone system with terminals connected to a digital e

Telephonic communications – Substation or terminal circuitry – Noise suppression

Direct coupling of telephone volume control with remote...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Directional microphone assembly

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Distributed processing of audio signals

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Dual-mode speaker telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Duplex hands-free communications circuit

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit

Duplex microphone communication system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Duplex transducer for simultaneous voice broadcast and reception

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Dynamic optimization of handsfree microphone gain

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Dynamically adjustable digital gyrator having extendable...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo canceling arrangement

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo cancellation

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo cancellation in a full-duplex speakerphone

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit

Echo cancelling method and echo canceller using the same

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo cancelling system suitable for voice conference

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo control device with quick response to sudden echo-path chan

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo reduction for a headset or handset

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Echo reduction for a headset or handset

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Efficient speakerphone anti-howling system