Circuit arrangement for improving the signal-to-noise ratio

Circuit arrangement for influencing the frequency response of a

Circuit arrangement for receiving two modulating signals, more s

Circuit arrangement for reducing the dynamic range of audio...

Circuit arrangement for suppressing oscillations

Circuit arrangement for testing the connection of a sound...

Circuit arrangement for the recognition of adjacent channel inte

Circuit arrangements for modifying dynamic range using action su

Circuit for a flash stroboscope for examining vocal chord functi

Circuit for attenuating commercial interruptions during radio br

Circuit for automatic selection between speech and music sound s

Circuit for automatically adjusting input sensitivity of audio s

Circuit for automatically recognizing and receiving mono and ste

Circuit for controlling operator indicators in an AM stereo rece

Circuit for controlling separation and high-cut operation of a s

Circuit for controlling the frequency and/or phase response of a

Circuit for decoding a multiplex signal in a stereo receiver

Circuit for detecting the level of noise in FM signal for use in

Circuit for determining that an audio signal is either speech or

Circuit for digital processing of audio signals