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Class Information
Number: 381/12
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation > Am subcarrier > Stereo indicators (e.g., stereo presence)
Description: Subject matter having an indicator which gives an indication in response to the presence of a stereophonic signal.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8645126 Apparatus and method of encoding and decoding signals Feb. 4, 2014
8565444 Detecting stereo and mono headset devices Oct. 22, 2013
8503698 Mixing apparatus Aug. 6, 2013
8428958 Apparatus and method of encoding and decoding signals Apr. 23, 2013
8296156 Apparatus and method for encoding/decoding signal Oct. 23, 2012
8165316 Portable terminal Apr. 24, 2012
8144878 FM receiver and pilot detector thereof, and method for determining a type of a processed signal Mar. 27, 2012
8139772 System and method for estimating channel condition based on filtered pilot energy signal Mar. 20, 2012
8139771 System and method for switching a mode of a receiver using block estimation Mar. 20, 2012
8093841 System and method for faster response time in stereo/mono detection Jan. 10, 2012
7921016 Method and device for providing 3D audio work Apr. 5, 2011
7889871 Apparatus for multichannel sound reproduction system Feb. 15, 2011
7835772 FM output portable music player with RDS capability Nov. 16, 2010
7751571 Sound signal processor and method for processing sound signal using the same Jul. 6, 2010
7715567 Noise reduction in a stereo receiver May. 11, 2010
7574264 Multirate cochlear stimulation strategy and apparatus Aug. 11, 2009
7472058 Automatic audio source detection for capture devices Dec. 30, 2008
7457420 Method and system for detecting signal modes in a broadcast audio transmission Nov. 25, 2008
7187775 Audio signal recording apparatus Mar. 6, 2007
7120256 Audio testing system and method Oct. 10, 2006
7050590 Method and apparatus for checking audio signals May. 23, 2006
6748085 Computer system with a common audio input for its audio circuitry Jun. 8, 2004
6738480 Method and device for cancelling stereophonic echo with frequency domain filtering May. 18, 2004
6496584 Multi-channel stereo converter for deriving a stereo surround and/or audio center signal Dec. 17, 2002
6021204 Analysis of audio signals Feb. 1, 2000
5974153 Method and system for sound expansion Oct. 26, 1999
5774555 Switched capacitor bandpass filter for detecting pilot signal Jun. 30, 1998
5751819 Level meter for digitally-encoded audio May. 12, 1998
5703953 Monaural signal judgement circuit Dec. 30, 1997
5655025 Circuit for automatically recognizing and receiving mono and stereo audio signals Aug. 5, 1997
5499300 Stereo and dual audio signal identifying circuit Mar. 12, 1996
5432855 Stereo and dual audio signal identifying system Jul. 11, 1995
5375188 Music/voice discriminating apparatus Dec. 20, 1994
5272756 Method and apparatus for determining phase correlation of a stereophonic signal Dec. 21, 1993
5210796 Stereo/monaural detection apparatus May. 11, 1993
5201001 Pilot signal cancelling system Apr. 6, 1993
5103480 FMX identification signal detection apparatus Apr. 7, 1992
5054071 Volume control for optimum television stereo separation Oct. 1, 1991
5050237 Radio receiver having automatic bandwidth control during tuning Sep. 17, 1991
5001757 FM stereo tone detector Mar. 19, 1991
4944011 Circuit for controlling operator indicators in an AM stereo receiver Jul. 24, 1990
4908868 Phase polarity test instrument and method Mar. 13, 1990
4747141 AM stereo signal decoder May. 24, 1988
4712241 Broadcast signal detected indication system Dec. 8, 1987
4691358 Stereo image display device Sep. 1, 1987
4680792 Demodulator comprising an indicator circuit for use in common to cancellation of a pilot signal and an indication of a reception state Jul. 14, 1987
4661994 Frequency and volume display for a receiver Apr. 28, 1987
4644580 Sound-multiplexed TV signal demodulator having electrically independent stereo and SAP demodulation means Feb. 17, 1987
4602379 Dual indicator circuit for tuning and stereo signals Jul. 22, 1986
4503397 AM Stereo pilot signal detection circuitry Mar. 5, 1985

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