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Class Information
Number: 375/334
Name: Pulse or digital communications > Receivers > Angle modulation > Frequency shift keying
Description: Subject matter where the carrier has been modulated by shifting its frequency in accordance with the pulses transmitted.










Sub-classes under this class:

Class Number Class Name Patents
375/336 Minimum shift keying 107
375/335 More than two frequencies 125
375/337 Separate mark and space channels 42


Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
6188733 Center frequency error detecting circuit for FSK signal receiver Feb. 13, 2001
6169761 Method and transceiver using an improved protocol for a frequency hop communication system Jan. 2, 2001
6160857 Demodulator for frequency shift keying signals Dec. 12, 2000
6144253 Digital FSK demodulator Nov. 7, 2000
6137842 System and method for determining the time difference of arrival of a frequency shift keyed signal at two separate receivers Oct. 24, 2000
6121829 Frequency demodulator Sep. 19, 2000
6101213 Method system and computer program product for spread spectrum communication using circular waveform shift-keying Aug. 8, 2000
6081560 Production of a frequency control signal in an FSK receiver Jun. 27, 2000
6069975 Method and device for processing a signal May. 30, 2000
6047023 Swept frequency modulation and demodulation technique Apr. 4, 2000
6040738 Direct conversion receiver using single reference clock signal Mar. 21, 2000
6038268 Direct conversion FSK signal radio receiver Mar. 14, 2000
6034990 Digital radio transmission and reception system applying a direct modulation and demodulation method Mar. 7, 2000
6031418 Method and apparatus for demodulating digital frequency modulation (FM) signals Feb. 29, 2000
6018553 Multi-level mixer architecture for direct conversion of FSK signals Jan. 25, 2000
6016328 Method and apparatus for the synchronization of a signal receiving station Jan. 18, 2000
6002725 M-ary FSK receiver Dec. 14, 1999
5999577 Clock reproducing circuit for packet FSK signal receiver Dec. 7, 1999
5994953 Apparatus and method for detecting digital FM Nov. 30, 1999
5991346 Method for determining the best time to sample an information signal Nov. 23, 1999
5987075 FSK signal receiver Nov. 16, 1999
5966406 Method and apparatus for noise burst detection in signal processors Oct. 12, 1999
5960042 Method in a selective call receiver for synchronizing to a multi-level radio signal Sep. 28, 1999
5948083 System and method for self-adjusting data strobe Sep. 7, 1999
5949280 Multivalued FSK demodulation window comparator Sep. 7, 1999
5949829 Central error detecting circuit for FSK receiver Sep. 7, 1999
5949830 Small wireless radio Sep. 7, 1999
5943370 Direct conversion receiver Aug. 24, 1999
5905763 Receiving apparatus and decoder May. 18, 1999
5905444 Anti-theft system for a motor vehicle May. 18, 1999
5894499 Direct conversion receiver having filter with cut-off frequency switching means Apr. 13, 1999
5883922 FSK communication device for digital information Mar. 16, 1999
5864585 Cosine segment communications system Jan. 26, 1999
5862155 Trellis coded FM digital communications system and method Jan. 19, 1999
5828708 CID demodulator for DCT Oct. 27, 1998
5825852 Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator Oct. 20, 1998
5822378 Receiver, a demodulator, and a demodulation method Oct. 13, 1998
5818881 Digital frequency demodulator Oct. 6, 1998
5818296 FSK demodulator using goertzel's discrete fourier transform Oct. 6, 1998
5799043 Method and apparatus for decoding a two-level radio signal Aug. 25, 1998
5797082 Communication receiver for receiving satellite broadcasts Aug. 18, 1998
5789991 FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal Aug. 4, 1998
5783967 Frequency shift keying demodulation circuit using logic circuitry Jul. 21, 1998
5781588 FSK signal receiver Jul. 14, 1998
5781621 Microcontroller with a caller identification unit Jul. 14, 1998
5757858 Dual-mode digital FM communication system May. 26, 1998
5748036 Non-coherent digital FSK demodulator May. 5, 1998
5740207 Complex signal limiting Apr. 14, 1998
5732110 Receiver having an adjustable symbol slice demodulator Mar. 24, 1998
5729576 Interference canceling receiver Mar. 17, 1998

1 2 3 4 5 6 7 8 9










 
 
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