Speakerphone

Speakerphone control circuit having low gain states and method f

Speakerphone controlled by a comparator with hysteresis

Speakerphone device with auxiliary circuit for eliminating click

Speakerphone for radio and landline telephones

Speakerphone with adaptive cancellation of room echoes

Speakerphone with downfiring speaker and directional...

Speakerphone with event driven control circuit

Speech amplifier associated with an LED

Speech circuit configuration

Speech circuit controlling sidetone signal by background noise l

Speech circuit for subscriber telephone apparatus

Speech communication apparatus

Speech communication apparatus equipped with echo canceller

Speech control apparatus used in a folding telephone

Speech control in a telephone station

Static discharge snubber circuit for silicon controlled rectifie

Subscriber circuit

Subscriber line driver with equalizer

Subscriber line interface circuit having an impedence synthesize