US PATENT SUBCLASS 381 / 12
.~.~.~.~ Stereo indicators (e.g., stereo presence)

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

1  DF  BINAURAL AND STEREOPHONIC {8}
2  DF  .~ Broadcast or multiplex stereo {2}
3  DF  .~.~ FM final modulation {1}
4  DF  .~.~.~ AM subcarrier {7}
12.~.~.~.~ Stereo indicators (e.g., stereo presence)

DEFINITION

Classification: 381/12

Stereo indicators (e.g., stereo presence):

(under subclass 4) Subject matter having an indicator which gives an indication in response to the presence of a stereophonic signal.