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Class Information
Number: 329/349
Name: Demodulators > Amplitude modulation demodulator > Having specific distortion, noise or other interference prevention, reduction or compensation
Description: Subject matter including the neutralization of an undesirable characteristic of an amplitude modulation demodulator or its signals.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7456683 |
Amplitude error compensating device and quadrature skew error compensating device |
Nov. 25, 2008 |
| 7362814 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators |
Apr. 22, 2008 |
| 7265610 |
Error detection in a signal in amplitude modulation |
Sep. 4, 2007 |
| 7260163 |
Noise blanker using an adaptive all-pole predictor and method therefor |
Aug. 21, 2007 |
| 7190733 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators |
Mar. 13, 2007 |
| 6933777 |
AM detecting apparatus with overmodulation detecting function |
Aug. 23, 2005 |
| 6927623 |
Amplitude-modulated signal receiving circuit |
Aug. 9, 2005 |
| 6907088 |
Contactless IC card for preventing incorrect data recovery in demodulation of an amplitude-modulated carrier wave |
Jun. 14, 2005 |
| 6897719 |
Demodulation circuit and demodulation method |
May. 24, 2005 |
| 6828853 |
Wide dynamic range demodulator for smart cards or contactless tickets |
Dec. 7, 2004 |
| 6577182 |
Device for demodulating an amplitude-modulated signal |
Jun. 10, 2003 |
| 6456673 |
Digital radio frequency interference canceller |
Sep. 24, 2002 |
| 6442218 |
Demodulator |
Aug. 27, 2002 |
| 6400774 |
Nonlinearity-caused distortion compensating system |
Jun. 4, 2002 |
| 6169585 |
Circuit arrangement for demodulating an intermediate-frequency video signal |
Jan. 2, 2001 |
| 6075409 |
Demodulation method and arrangement |
Jun. 13, 2000 |
| 6041082 |
Digital amplitude modulation amplifier and television broadcasting machine |
Mar. 21, 2000 |
| 6031419 |
Demodulator for contactless chip card |
Feb. 29, 2000 |
| 6014412 |
Digital radio frequency interference canceller |
Jan. 11, 2000 |
| 5742200 |
Environmentally rugged optical sensor with improved noise cancellation |
Apr. 21, 1998 |
| 5729575 |
Transmitter and receiver system and method utilizing a pilot carrier notch data encoded signal |
Mar. 17, 1998 |
| 5697085 |
Radio transceiver comprising an arrangement for compensating for a DC component |
Dec. 9, 1997 |
| 5659583 |
Tone canceller for QAM demodulator |
Aug. 19, 1997 |
| 5604929 |
System for correcting quadrature gain and phase errors in a direct conversion single sideband receiver independent of the character of the modulated signal |
Feb. 18, 1997 |
| 5548244 |
Method and apparatus for eliminating DC offset for digital I/Q demodulators |
Aug. 20, 1996 |
| 5539356 |
DC coupled amplifier fed by an RF detector |
Jul. 23, 1996 |
| 5461305 |
Preprocessing circuit for measuring signal envelope flatness degree in a reproducer |
Oct. 24, 1995 |
| 5461340 |
Amplitude demodulator for radio receivers to compensate for field strength influence |
Oct. 24, 1995 |
| 5438591 |
Quadrature amplitude modulation type digital radio communication device and method for preventing abnormal synchronization in demodulation system |
Aug. 1, 1995 |
| 5249200 |
Device and method for combining precoding with symbol-rate spectral shaping |
Sep. 28, 1993 |
| 5144231 |
Eddy current detector for detecting an object with offset compensation |
Sep. 1, 1992 |
| 5015963 |
Synchronous demodulator |
May. 14, 1991 |
| 4985685 |
Detector circuit including current attenuating circuit and capacitor |
Jan. 15, 1991 |
| 4975654 |
Data signal discrimination method and apparatus |
Dec. 4, 1990 |
| 4945313 |
Synchronous demodulator having automatically tuned band-pass filter |
Jul. 31, 1990 |
| 4890066 |
Envelope detector |
Dec. 26, 1989 |
| 4726069 |
A muiti-mode modulation and demodulation system and method |
Feb. 16, 1988 |
| 4718113 |
Zero-IF receiver wih feedback loop for suppressing interfering signals |
Jan. 5, 1988 |
| 4565970 |
Precision harmonic rejecting demodulator with digital phase alignment |
Jan. 21, 1986 |
| 4560942 |
Demodulation circuit having triangular wave for blocking harmonics |
Dec. 24, 1985 |
| 4511848 |
Synchronous AM demodulator with quadrature signal cancellation |
Apr. 16, 1985 |
| 4492926 |
Amplitude modulation detector |
Jan. 8, 1985 |
| 4403194 |
Closed loop amplitude demodulator |
Sep. 6, 1983 |
| 4393352 |
Sample-and-hold hybrid active RC filter |
Jul. 12, 1983 |
| 4300020 |
Method and apparatus for eliminating pilot signal components from stereo demodulated signals |
Nov. 10, 1981 |
| 4258327 |
Detector circuit with integrating feedback means |
Mar. 24, 1981 |
| 4250457 |
Full wave rectifier envelope detector |
Feb. 10, 1981 |
| 4249038 |
Stereo decoder with 19KHz-pilot suppression and improved oscillator phase locking |
Feb. 3, 1981 |
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