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Class Information
Number: 381/7
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation > Am subcarrier > Switch-type detector or modulator
Description: Subject matter having a detector or modulator which extracts information from or adds information to an input waveform only at instants determined by a selector pulse.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7187775 |
Audio signal recording apparatus |
Mar. 6, 2007 |
| 7107024 |
FM modulator output control during turn on |
Sep. 12, 2006 |
| 6823072 |
Peak to peak signal detector for audio system |
Nov. 23, 2004 |
| 5862189 |
De-interleaving and buffering in one memory |
Jan. 19, 1999 |
| 5737034 |
Radio frequency modulator having an audio multiplex broadcasting function |
Apr. 7, 1998 |
| 5696830 |
Circuit arrangement for deriving a quality signal dependent on the quality of a received multiplex signal |
Dec. 9, 1997 |
| 5682431 |
FM stereo broadcasting apparatus and method |
Oct. 28, 1997 |
| 5619577 |
Transmission system, and a transmitter and a receiver for use in such a system |
Apr. 8, 1997 |
| 5604808 |
FM signal processor |
Feb. 18, 1997 |
| 5592557 |
Radio receiver with digital signal processing |
Jan. 7, 1997 |
| 5590203 |
Pilot signal detection circuit |
Dec. 31, 1996 |
| 5442709 |
Circuit for decoding a multiplex signal in a stereo receiver |
Aug. 15, 1995 |
| 5416843 |
Devices, systems and methods for composite signal decoding |
May. 16, 1995 |
| 5404405 |
FM stereo decoder and method using digital signal processing |
Apr. 4, 1995 |
| 5357544 |
Devices, systems, and methods for composite signal decoding |
Oct. 18, 1994 |
| 5289543 |
FM receiver and communication systems including same |
Feb. 22, 1994 |
| 5282224 |
Signal processing integrated circuit device |
Jan. 25, 1994 |
| 5257312 |
Time-discrete stereo decoder |
Oct. 26, 1993 |
| 5255319 |
Noise suppressing circuit in an FM tuner |
Oct. 19, 1993 |
| 5239585 |
Devices, systems, and methods for composite signal decoding |
Aug. 24, 1993 |
| 5220607 |
Digital switching signal in stereo decoders and circuit array for generation thereof |
Jun. 15, 1993 |
| 5179593 |
FM stereo receiving device |
Jan. 12, 1993 |
| 5155769 |
Discrete parallel path modulation multiplexer |
Oct. 13, 1992 |
| 5109542 |
AM-FM combined stereo receiver |
Apr. 28, 1992 |
| 5107134 |
Matrix circuit of FM stereo multiplex demodulation circuit |
Apr. 21, 1992 |
| 5091943 |
FM stereo receiving device |
Feb. 25, 1992 |
| 5054070 |
Stereo signal communication system and method |
Oct. 1, 1991 |
| 5014316 |
Compatible quadrature amplitude modulation detector system |
May. 7, 1991 |
| 4991015 |
Method and circuit arrangement for identifying the presence or absence of at least one frequency of a known value in an input signal compound of a plurality of frequencies |
Feb. 5, 1991 |
| 4982431 |
Signal distinction circuit |
Jan. 1, 1991 |
| 4933974 |
Switched capacitor pilot phase and magnitude detector |
Jun. 12, 1990 |
| 4932058 |
Pilot cancellation circuit |
Jun. 5, 1990 |
| 4893341 |
Digital receiver operating at sub-nyquist sampling rate |
Jan. 9, 1990 |
| 4870684 |
PLL circuit for generating output signal synchronized with input signal by switching frequency dividing ratio |
Sep. 26, 1989 |
| 4860354 |
Arrangement for decoding a stereo multiplex signal |
Aug. 22, 1989 |
| 4827515 |
Digital demodulator |
May. 2, 1989 |
| 4817167 |
Method of receiving frequency-modulated stereo multiplex signals |
Mar. 28, 1989 |
| 4817150 |
Oscillator frequency control arrangement for a stereo decoder |
Mar. 28, 1989 |
| 4757538 |
Separation of L+R from L-R in BTSC system |
Jul. 12, 1988 |
| 4727580 |
Radio receiver |
Feb. 23, 1988 |
| 4723288 |
Stereo decoding by direct time sampling |
Feb. 2, 1988 |
| 4688253 |
L+R separation system |
Aug. 18, 1987 |
| 4578807 |
FM stereo multiplex demodulator |
Mar. 25, 1986 |
| 4569072 |
Clock-controlled filtering arrangement |
Feb. 4, 1986 |
| 4560942 |
Demodulation circuit having triangular wave for blocking harmonics |
Dec. 24, 1985 |
| 4539697 |
FM Stereo demodulating circuit |
Sep. 3, 1985 |
| 4517520 |
Circuit for converting a staircase waveform into a smoothed analog signal |
May. 14, 1985 |
| 4502148 |
FM Stereo demodulator for demodulating stereo signals directly from an FM intermediate frequency signal |
Feb. 26, 1985 |
| 4497063 |
FM stereo demodulator |
Jan. 29, 1985 |
| 4489430 |
FM Stereo demodulation circuit |
Dec. 18, 1984 |
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