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Class Information
Number: 375/335
Name: Pulse or digital communications > Receivers > Angle modulation > Frequency shift keying > More than two frequencies
Description: Subject matter in which the input signal detected has three or more frequencies representing three or more pieces of information.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7609785 |
Mitigation of interference in cell search by wireless transmit and receive units |
Oct. 27, 2009 |
| 7573942 |
Method for encoding and decoding control information in a wireless communications system |
Aug. 11, 2009 |
| 7508890 |
Apparatus and method for FSK demodulation with integrated time and frequency tracking |
Mar. 24, 2009 |
| 7480349 |
Low IF receiver systems and methods |
Jan. 20, 2009 |
| 7460618 |
System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform |
Dec. 2, 2008 |
| 7400904 |
Dual mode AM-FM receiver with I-Q decoding, such as for utility data collection |
Jul. 15, 2008 |
| 7257408 |
Radio communication system and transmission mode selecting method |
Aug. 14, 2007 |
| 7231003 |
System and method for aligning data between local and remote sources thereof |
Jun. 12, 2007 |
| 7184493 |
Pulse sorting apparatus for frequency histogramming in a radar receiver system |
Feb. 27, 2007 |
| 7158588 |
System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform |
Jan. 2, 2007 |
| 7072414 |
Gaussian minimum shift keying (GMSK) precoding communication method |
Jul. 4, 2006 |
| 7068169 |
Use of a subcarrier in an organic semiconductor radio frequency identification system |
Jun. 27, 2006 |
| 7035312 |
Pilot signal cycling technique for a control system that reduces distortion produced by electrical circuits |
Apr. 25, 2006 |
| 7003047 |
Tri-state integer cycle modulation |
Feb. 21, 2006 |
| 6933776 |
Signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator |
Aug. 23, 2005 |
| 6907096 |
Data recovery method and apparatus |
Jun. 14, 2005 |
| 6904104 |
Technique for demodulating a linear modulated data signal in a communications system |
Jun. 7, 2005 |
| 6836648 |
Receiving apparatus for electromagnetic signals |
Dec. 28, 2004 |
| 6813324 |
Synchronized communication system |
Nov. 2, 2004 |
| 6738430 |
Apparatus and method for digital wireless communications |
May. 18, 2004 |
| 6704351 |
Method and system for training a modem |
Mar. 9, 2004 |
| 6671332 |
Zero IF receiver with reduced AM detector |
Dec. 30, 2003 |
| 6665350 |
Method and system for improved analog signal detection |
Dec. 16, 2003 |
| 6618449 |
Receiver for a frequency-shift-keying, continuous-wave radar |
Sep. 9, 2003 |
| 6608868 |
Apparatus and method for digital wireless communications |
Aug. 19, 2003 |
| 6556630 |
Dual band telemetry system |
Apr. 29, 2003 |
| 6553083 |
Frequency control and orthogonal detection circuit and FSK receiver |
Apr. 22, 2003 |
| 6539068 |
Receiver of wideband digital signal in the presence of a narrow band interfering signal |
Mar. 25, 2003 |
| 6480551 |
Signal processing device and method for switching signal processors thereof |
Nov. 12, 2002 |
| 6418158 |
Synchronization in mobile satellite systems using dual-chirp waveform |
Jul. 9, 2002 |
| 6408010 |
TDMA master-slave filter tuning |
Jun. 18, 2002 |
| 6400756 |
Phased array spread spectrum receiver |
Jun. 4, 2002 |
| 6381289 |
Demodulation method in high speed asynchronous time division multiplexed packet data transmission |
Apr. 30, 2002 |
| 6366146 |
Phase-locked loop based clock phasing implementing a virtual delay |
Apr. 2, 2002 |
| 6359940 |
Method and apparatus for downconverting signals transmitted using a plurality of modulation formats to a common intermediate frequency range |
Mar. 19, 2002 |
| 6359942 |
FSK demodulator |
Mar. 19, 2002 |
| 6288618 |
Logic-based architecture for FSK modulation and demodulation |
Sep. 11, 2001 |
| 6122330 |
Diversity combining |
Sep. 19, 2000 |
| 6067315 |
Method and apparatus for coherently-averaged power estimation |
May. 23, 2000 |
| 6064689 |
Radio communications receiver and method of receiving radio signals |
May. 16, 2000 |
| 6058172 |
Telephone with novel FSK decoding means, simultaneous off-hook caller ID reception means, and set of configurable function key means |
May. 2, 2000 |
| 6044074 |
Rapid signal acquisition and synchronization for access transmissions |
Mar. 28, 2000 |
| 6018553 |
Multi-level mixer architecture for direct conversion of FSK signals |
Jan. 25, 2000 |
| 6002725 |
M-ary FSK receiver |
Dec. 14, 1999 |
| 5974094 |
FFT receiver for MFSK |
Oct. 26, 1999 |
| 5917871 |
Bit synchronization circuit and method capable of correct bit synchronization for both 2-value and 4-value FSK transmission signals |
Jun. 29, 1999 |
| 5852638 |
Method and apparatus for demodulating a symbol using symbol fragmentation, correlation and fourier analysis |
Dec. 22, 1998 |
| 5805017 |
Baseband demodulation of M-ary frequency shift keyed signals and a receiver therefor |
Sep. 8, 1998 |
| 5781064 |
Digital filtering system for filtering digital outputs of a four level FSK demodulator |
Jul. 14, 1998 |
| 5748036 |
Non-coherent digital FSK demodulator |
May. 5, 1998 |
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