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Class Information
Number: 381/4
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation > Am subcarrier
Description: Subject matter where a carrier wave is frequency modulated by a subcarrier which has been amplitude modulated by a signal.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7295631 |
Stereo demultiplexer |
Nov. 13, 2007 |
| 6978026 |
Circuit arrangement for gaining a stereo subcarrier and an RDS carrier |
Dec. 20, 2005 |
| 6813359 |
Apparatus and method for minimizing multipath interference |
Nov. 2, 2004 |
| 6777718 |
Semiconductor optical device |
Aug. 17, 2004 |
| 6618486 |
Controller for FM 412 multiplex power regulation |
Sep. 9, 2003 |
| 6492913 |
Method and circuit for decoding an analog audio signal using the BTSC standard |
Dec. 10, 2002 |
| 6272226 |
Apparatus and method for masking audio signals in a signal distribution system |
Aug. 7, 2001 |
| 6178317 |
System and method for mitigating intermittent interruptions in an audio radio broadcast system |
Jan. 23, 2001 |
| 6118879 |
BTSC encoder |
Sep. 12, 2000 |
| 5848167 |
Distributed pre-emphasis equalizer |
Dec. 8, 1998 |
| 5796842 |
BTSC encoder |
Aug. 18, 1998 |
| 5774555 |
Switched capacitor bandpass filter for detecting pilot signal |
Jun. 30, 1998 |
| 5696830 |
Circuit arrangement for deriving a quality signal dependent on the quality of a received multiplex signal |
Dec. 9, 1997 |
| 5684878 |
Video signal recorder video apparatus and audio signal receiver |
Nov. 4, 1997 |
| 5673324 |
Radio receiver circuit for deriving at least one reception quality signal |
Sep. 30, 1997 |
| 5590203 |
Pilot signal detection circuit |
Dec. 31, 1996 |
| 5561849 |
Apparatus and method for music and lyrics broadcasting |
Oct. 1, 1996 |
| 5537613 |
Device and method for detecting pilot signal for two-carrier sound multiplexing system |
Jul. 16, 1996 |
| 5506906 |
Radio receiver station-seeker stop-signal generator |
Apr. 9, 1996 |
| 5507024 |
FM data-system radio receiver |
Apr. 9, 1996 |
| 5499300 |
Stereo and dual audio signal identifying circuit |
Mar. 12, 1996 |
| 5471534 |
Devices, systems and methods for composite signal decoding employing interpolation filter |
Nov. 28, 1995 |
| 5467399 |
Coherent signal generation in digital radio receiver |
Nov. 14, 1995 |
| 5442709 |
Circuit for decoding a multiplex signal in a stereo receiver |
Aug. 15, 1995 |
| 5406631 |
Stereo signal demodulator circuit and stereo signal demodulator using the same |
Apr. 11, 1995 |
| 5396551 |
Headset amplifier |
Mar. 7, 1995 |
| 5357574 |
Coherent signal generation in digital radio receiver |
Oct. 18, 1994 |
| 5349386 |
Wireless signal transmission systems, methods and apparatus |
Sep. 20, 1994 |
| 5337196 |
Stereo/multivoice recording and reproducing video tape recorder including a decoder developing a switch control signal |
Aug. 9, 1994 |
| 5315583 |
Method and apparatus for digital audio broadcasting and reception |
May. 24, 1994 |
| 5257312 |
Time-discrete stereo decoder |
Oct. 26, 1993 |
| 5241687 |
Phase controlling phase of local subcarrier signal to correspond to transmitted pilot signal |
Aug. 31, 1993 |
| 5222143 |
Compatible multivoice broadcasting receiver |
Jun. 22, 1993 |
| 5220607 |
Digital switching signal in stereo decoders and circuit array for generation thereof |
Jun. 15, 1993 |
| 5181249 |
Three channel audio transmission and/or reproduction systems |
Jan. 19, 1993 |
| 5054070 |
Stereo signal communication system and method |
Oct. 1, 1991 |
| 4944010 |
Stereo demodulator and a demodulating method thereof |
Jul. 24, 1990 |
| 4933972 |
Stereo multiplex demodulator |
Jun. 12, 1990 |
| 4887297 |
Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus |
Dec. 12, 1989 |
| 4823390 |
FM stereo generator |
Apr. 18, 1989 |
| 4811395 |
Two-tone test signal method for BTSC calibration |
Mar. 7, 1989 |
| 4750206 |
Adapter for TV stereo, SAP and auxiliary signals |
Jun. 7, 1988 |
| 4736427 |
MTS test signal generator |
Apr. 5, 1988 |
| 4723287 |
Demodulating system for multivoice system |
Feb. 2, 1988 |
| 4694495 |
Integrable circuit for identifying a pilot tone |
Sep. 15, 1987 |
| 4691356 |
AM/FM synchronizing circuit |
Sep. 1, 1987 |
| 4688252 |
IV SAP/stereo audio system |
Aug. 18, 1987 |
| 4660193 |
Digital modulation method for standard broadcast FM subcarrier |
Apr. 21, 1987 |
| 4644580 |
Sound-multiplexed TV signal demodulator having electrically independent stereo and SAP demodulation means |
Feb. 17, 1987 |
| 4637044 |
Phase selectable circuit for use in a stereo demodulator |
Jan. 13, 1987 |
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