AC line-correlated noise-canceling circuit
Acoustic speaker system
Adaptive AM audio processor
Adaptive noise cancellation device
Adaptive noise canceller
Adaptive noise reduction circuit for a sound reproduction system
Adaptive noise suppressor
Aid to hearing speech in a noisy environment
Apex loudspeaker
Apparatus and methods for active noise suppression in stereo mul
Apparatus and methods for removing unwanted components from a co
Apparatus for reducing noise in audio signals
Arrangement for reducing the noise in a speech signal mixed with
Audio amplifier switch-on control circuit
Audio apparatus demonstrating
Audio communications system with built in expansion capability f
Audio data processing apparatus
Audio installation, in particular stereophonic, for television s
Audio noise gate
Audio peak limiter using Hilbert transforms