US PATENT SUBCLASS 381 / 57
.~ Amplification control responsive to ambient sound

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

56  DF  MONITORING OF SOUND {1}
57.~ Amplification control responsive to ambient sound

DEFINITION

Classification: 381/57

Amplification control responsive to ambient sound:

(under subclass 56) Subject matter where the ambient sound level, at a place where sound is being reproduced, is evaluated and the result used to control the volume of the reproduced sound.