Acoustic feedback cancellation for equalized amplifying systems
Adaptive conferencing pod sidetone compensator connecting to...
Adaptive hybrid circuit
Adaptive line hybrids
Apparatus and method for detecting far end speech
Apparatus for reducing echoes and noises in telephone
Architecture for telephone set
Attended messaging machine
Automatic sidetone selector
Background noise compensation in a telephone network
Background noise compensation in a telephone network
Circuit and method of reducing sidetone in a receive signal path
Circuit for eliminating echo and side tones in a switching...
Combined sidetone and hybrid balance
Differential receive booster amplifier for telephone instruments
Duplex microphone communication system
Echo cancelling method and echo canceller using the same
Electrical telephone speech network
Hands-free telephone set
High-frequency noise elimination for use in telephone systems