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Class Information
Number: 329/323
Name: Demodulators > Frequency modulation demodulator > Input signal combined with local oscillator or carrier frequency signal
Description: Subject matter where the modulated signal input to the demodulator interacts therein with oscillations from a secondary source.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7557647 |
Heterodyne receiver using resonant structures |
Jul. 7, 2009 |
| 7480348 |
I/Q demodulation circuit |
Jan. 20, 2009 |
| 7421043 |
Method and/or apparatus for stabilizing the frequency of digitally synthesized waveforms |
Sep. 2, 2008 |
| 7386286 |
High frequency low noise phase-frequency detector and phase noise reduction method and apparatus |
Jun. 10, 2008 |
| 7301377 |
Demodulation apparatus and receiving apparatus |
Nov. 27, 2007 |
| 7138857 |
Signal processing device for mobile radio |
Nov. 21, 2006 |
| 6985029 |
Circuit configuration for tolerance correction in a frequency demodulator |
Jan. 10, 2006 |
| 6982592 |
Zero if complex quadrature frequency discriminator and FM demodulator |
Jan. 3, 2006 |
| 6847255 |
Zero IF complex quadrature frequency discriminator and FM demodulator |
Jan. 25, 2005 |
| 6677816 |
Circuit arrangement for demodulating signals |
Jan. 13, 2004 |
| 6459333 |
Differentiate and divide FM demodulator |
Oct. 1, 2002 |
| 6353639 |
Filter configuration and slope detector for quadrature amplitude modulated signals |
Mar. 5, 2002 |
| 6072848 |
Method and apparatus for constructing a digital phase differentiator incorporating a dynamic decrement counter |
Jun. 6, 2000 |
| 5982821 |
Frequency discriminator and method and receiver incorporating same |
Nov. 9, 1999 |
| 5912929 |
Method and apparatus for performing carrier detection |
Jun. 15, 1999 |
| 5751188 |
FM demodulator using a switched capacitor phase shifter |
May. 12, 1998 |
| 5734295 |
Quadrature demodulator having active filters formed with emitter follower output stages |
Mar. 31, 1998 |
| 5630216 |
Micropower RF transponder with superregenerative receiver and RF receiver with sampling mixer |
May. 13, 1997 |
| 5604808 |
FM signal processor |
Feb. 18, 1997 |
| 5579338 |
Spread spectrum receiver using partial correlations |
Nov. 26, 1996 |
| 5563537 |
Frequency-controlled circuit |
Oct. 8, 1996 |
| 5548244 |
Method and apparatus for eliminating DC offset for digital I/Q demodulators |
Aug. 20, 1996 |
| 5469112 |
Communication device with zero-crossing demodulator |
Nov. 21, 1995 |
| 5448202 |
Sigma-delta FM demodulator |
Sep. 5, 1995 |
| 5418489 |
Method of recovering a frequency modulated signal |
May. 23, 1995 |
| 5345188 |
Sigma-delta digital FM demodulator |
Sep. 6, 1994 |
| 5179360 |
Transmitting/receiving apparatus switchable between digital and analog modulation modes |
Jan. 12, 1993 |
| 5157343 |
Electronic arrangement for receiving a modulated carrier signal |
Oct. 20, 1992 |
| 5157344 |
Digital quadrature phase detector for angle modulated signals |
Oct. 20, 1992 |
| 5131009 |
Digital radio link receiving device |
Jul. 14, 1992 |
| 5095363 |
Method of demodulating multi-standard TV signals and a circuit device for implementing the method |
Mar. 10, 1992 |
| 5039951 |
Josephson junction FSK demodulator |
Aug. 13, 1991 |
| 4987374 |
FSK demodulator |
Jan. 22, 1991 |
| 4980687 |
Digital demodulator |
Dec. 25, 1990 |
| 4944025 |
Direct conversion FM receiver with offset |
Jul. 24, 1990 |
| 4862098 |
Continuous-wave-modulation detectors using prediction methods |
Aug. 29, 1989 |
| 4853944 |
Digital AM/FM/.phi.M demodulator |
Aug. 1, 1989 |
| 4847578 |
Method and device for detecting false locks between a reference signal and a signal to be demodulated by coherent digital demodulation |
Jul. 11, 1989 |
| 4779054 |
Digital inphase/quadrature product detector |
Oct. 18, 1988 |
| 4777449 |
Threshold-extension FM demodulator apparatus and method |
Oct. 11, 1988 |
| 4766392 |
Demodulating an angle-modulated signal |
Aug. 23, 1988 |
| 4755761 |
Zero intermediate-frequency demodulator |
Jul. 5, 1988 |
| 4754228 |
Method and apparatus for demodulating an angle modulated signal |
Jun. 28, 1988 |
| 4677690 |
Baseband demodulator for FM and/or AM signals |
Jun. 30, 1987 |
| 4663595 |
Digital integrated frequency demodulator subcircuit |
May. 5, 1987 |
| 4656431 |
Digital frequency discriminator |
Apr. 7, 1987 |
| 4603300 |
Frequency modulation detector using digital signal vector processing |
Jul. 29, 1986 |
| 4590433 |
Doubled balanced differential amplifier circuit with low power consumption for FM modulation or demodulation |
May. 20, 1986 |
| 4577157 |
Zero IF receiver AM/FM/PM demodulator using sampling techniques |
Mar. 18, 1986 |
| 4560941 |
Frequency modulation detector using digital signal vector processing |
Dec. 24, 1985 |
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