Automatic volume control for car radio - has microphone picking up noise in car to give control signal and switched OFF at high signal strength

The device adjusts the volume to the noise level in the car. A microphone picks up the noise level inside the car, and its LF components are converted into an electric interference signal which controls the useful signal level and/or the dynamic level of the signal source. In order to separate the i...

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Bibliographic Details
Main Authors FISCHELMAYER,HEINRICH, ANDING,HERBERT, X. BAUMGARTNER,FRANZ
Format Patent
LanguageEnglish
German
Published 14.02.1980
Edition3
Subjects
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
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Summary:The device adjusts the volume to the noise level in the car. A microphone picks up the noise level inside the car, and its LF components are converted into an electric interference signal which controls the useful signal level and/or the dynamic level of the signal source. In order to separate the interference from the useful signal, picking up of the noise level is stopped when the useful signal exceeds a level depending on the car type. The noise level before interruption is stored, and holds constant the volume and/or dynamic range.
Bibliography:Application Number: DE19782835384