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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 4464781 |
Equalizer apparatus |
Aug. 7, 1984 |
| 4455673 |
Stereo indicating circuit |
Jun. 19, 1984 |
| 4454607 |
FM Stereophonic receiver with CPU controlled tuning and demodulating |
Jun. 12, 1984 |
| 4404432 |
Stereo identifying signal detection device |
Sep. 13, 1983 |
| 4399329 |
Stereophonic bilingual signal processor |
Aug. 16, 1983 |
| 4388493 |
In-band signaling system for FM transmission systems |
Jun. 14, 1983 |
| 4281217 |
Apparatus and method for the identification of specially encoded FM stereophonic broadcasts |
Jul. 28, 1981 |
| 4236041 |
Stereophonic signal indicating apparatus |
Nov. 25, 1980 |
| 4123714 |
FM Receiver with liquid crystal signal indicator |
Oct. 31, 1978 |
| 4091241 |
Stereo indicating circuit for an FM receiver |
May. 23, 1978 |
| 4054839 |
Balanced synchronous detector circuit |
Oct. 18, 1977 |
| 3999132 |
Stereo inhibit circuit |
Dec. 21, 1976 |
| 3956594 |
Indicating circuit for an FM stereophonic signal receiver |
May. 11, 1976 |
| 3944749 |
Compatible AM stereophonic receivers involving sideband separation at IF frequency |
Mar. 16, 1976 |
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