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Class Information
Number: 329/315
Name: Demodulators > Frequency modulation demodulator
Description: Subject matter where the demodulator extracts the modulating signal from a modulated signal which has undergone frequency modulation.

Sub-classes under this class:

Class Number Class Name Patents
329/318 Having specific distortion, noise or other interference prevention, reduction or compensation 132
329/322 Including microwave or distributed parameter structure 14
329/344 Including signal passed through single demodulating path including resonant circuit 6
329/323 Input signal combined with local oscillator or carrier frequency signal 70
329/341 Input signal converted to and processed in pulse form (e.g., pulse counter or digital type demodulator) 87
329/327 Input signal split into plural signals 66
329/316 Plural demodulation 72

Patents under this class:
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Patent Number Title Of Patent Date Issued
8629716 Modulator, demodulator and modulator-demodulator Jan. 14, 2014
8588353 Frequency selective IQ correction Nov. 19, 2013
8565348 Radio transmitting apparatus Oct. 22, 2013
8559564 Transmitting/receiving system and method of processing broadcast signal in transmitting/receiving system Oct. 15, 2013
8532230 Instantaneous phasor determination for poly-phase electrical grids Sep. 10, 2013
8514982 Systems and methods for digitizing multiple channels in a receiver Aug. 20, 2013
8483311 Method, apparatus and computer program product for providing a data encoding/decoding scheme Jul. 9, 2013
8446976 Signal generator with adjustable phase May. 21, 2013
8422596 Communication device, communication method, and program Apr. 16, 2013
8392176 Processing of excitation in audio coding and decoding Mar. 5, 2013
8310303 Demodulator and communication apparatus Nov. 13, 2012
8254430 Method and apparatus for detection and control of spread spectrum EMI reduction Aug. 28, 2012
8207699 Method and apparatus for AC motor control Jun. 26, 2012
8184746 Simplified de-rotation in digital FM demodulator architectures May. 22, 2012
8170151 FSK receiver May. 1, 2012
8160191 Correction of quadrature errors Apr. 17, 2012
8085088 Quadrature signal demodulator circuitry suitable for doppler ultrasound Dec. 27, 2011
8014469 Pipeline architecture for multi-slot wireless link processing Sep. 6, 2011
7965805 Signal generator with signal tracking Jun. 21, 2011
7961061 Apparatus and method for modulation and demodulation using frequency selective baseband Jun. 14, 2011
7899134 Dynamic demodulator selection based on channel quality Mar. 1, 2011
7889813 Method, apparatus and receiver for demapping dual carrier modulated COFDM signals Feb. 15, 2011
7751303 Demodulation circuit for use in receiver using if directing sampling scheme Jul. 6, 2010
7702038 Radio frequency (RF) receiver with amplitude-shifted keying/frequency-shifted keying (ASK/FSK) duty cycle optimization algorithm Apr. 20, 2010
7653152 Frequency measurement system for low modulation index digital FM/PM communication Jan. 26, 2010
7650125 System and method for SAP FM demodulation Jan. 19, 2010
7589586 High frequency signal detection circuit Sep. 15, 2009
7532064 FSK demodulator circuit May. 12, 2009
7526052 Configurable filter and receiver incorporating same Apr. 28, 2009
7518438 FM detector circuit with unbalanced/balanced conversion Apr. 14, 2009
7498873 Wide-lane pseudorange measurements using FM signals Mar. 3, 2009
7477100 Method and system for single ended to differential ended demodulation Jan. 13, 2009
7420409 Phase locked loop demodulator with gain control Sep. 2, 2008
7418033 Selectively filtering a signal Aug. 26, 2008
7405613 Differential slope demodulator for low-IF frequencies Jul. 29, 2008
7330068 Adjusting coefficients of a filter Feb. 12, 2008
7248649 Digital baseband receiver including a time domain compensation module for suppressing group delay variation distortion incurred due to analog low pass filter deficiencies Jul. 24, 2007
7173982 Method and circuit for digitally correcting the frequency of a signal Feb. 6, 2007
7145965 Digital demodulator for terrestrial receiver Dec. 5, 2006
7136433 Frequency offset cancellation circuit for data determination in FM wireless communications Nov. 14, 2006
7026864 Non-coherent FSK demodulator Apr. 11, 2006
7006806 System and method for SAP FM demodulation Feb. 28, 2006
6985029 Circuit configuration for tolerance correction in a frequency demodulator Jan. 10, 2006
6972617 FM demodulator including a DC offset detector Dec. 6, 2005
6850113 Demodulator and communication device using the same Feb. 1, 2005
6809584 Signal transmission and receiving methods optimized for integrated circuit implementation Oct. 26, 2004
6724247 FM demodulator having DC offset compensation Apr. 20, 2004
6714025 Method and apparatus for synchronous demodulation of multiply modulated signals Mar. 30, 2004
6677816 Circuit arrangement for demodulating signals Jan. 13, 2004
6664849 Digital FM demodulator performing amplitude compensation Dec. 16, 2003

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