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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
5729577 Signal processor with improved efficiency Mar. 17, 1998
5721754 Signal quality detector and methods thereof Feb. 24, 1998
5715414 Four-value data wireless signal receiver Feb. 3, 1998
5703908 Fixed reference shift keying modulation for mobile radio telecommunications Dec. 30, 1997
5703525 Low cost system for FSK demodulation Dec. 30, 1997
5701332 Detector of the presence of a sequence of FSK modulated signals arriving on a modem Dec. 23, 1997
5684837 Adjustable digital FSK demodulator Nov. 4, 1997
5661734 Trellis coded FM digital communications system and method Aug. 26, 1997
5661759 Digital FSK receiver using double zero-crossing Aug. 26, 1997
5642380 Data communication system and modem therefor Jun. 24, 1997
5640428 Direct conversion receiver Jun. 17, 1997
5612976 Detectors Mar. 18, 1997
5608762 Apparatus and method for automatic discriminator compensation in a FSK receiver Mar. 4, 1997
5602875 Method and apparatus for encoding and decoding information in a digtial communication system Feb. 11, 1997
5602868 Multiple-modulation communication system Feb. 11, 1997
5598440 DDS driven DDS synthesizer for generating sinewave waveforms with reduced spurious signal levels Jan. 28, 1997
5598125 Method for demodulating a digitally modulated signal and a demodulator Jan. 28, 1997
5590413 Radio transceiver having shared modulation and demodulation mixer circuits Dec. 31, 1996
5586147 Demodulation method using quadrature modulation Dec. 17, 1996
5553099 FSK detector for determining an increasing time period between adjacent pulses of an FSK modulated square wave pulse train Sep. 3, 1996
5539355 Frequency-shift-keying detector using digital circuits Jul. 23, 1996
5533061 Method and apparatus for detecting an FSK encoded carrier signal Jul. 2, 1996
5533062 Method and apparatus for carrier tracking and demodulation Jul. 2, 1996
5513219 Apparatus and method for transmitting information with a subminimally modulated transmission signal Apr. 30, 1996
5511097 Delay detection circuit Apr. 23, 1996
5506861 System and method for joint demodulation of CDMA signals Apr. 9, 1996
5499270 Spectral encoding-decoding system and method thereof Mar. 12, 1996
5497121 Automatically correcting data detection circuit and method for FSK modulated signals Mar. 5, 1996
5491715 Automatic antenna tuning method and circuit Feb. 13, 1996
5483193 Circuit for demodulating FSK signals Jan. 9, 1996
5475307 Frequency demodulator and method for asynchronously demodulating sample signals Dec. 12, 1995
5461632 Trellis coded FM digital communications system and method Oct. 24, 1995
5453715 Communication device with efficient multi-level digital demodulator Sep. 26, 1995
5453714 Binary FM demodulator with self-adjusting resonant operating frequency according to demodulated binary output signal duty cycle Sep. 26, 1995
5450032 FSK data demodulator using mixing of quadrature baseband signals Sep. 12, 1995
5446421 Local oscillator phase noise cancelling modulation technique Aug. 29, 1995
5446762 Data demodulation circuit for FSK modulated RF signal receiver providing wide-band 90.degree. baseband phase shifting Aug. 29, 1995
5436931 FSK receiver Jul. 25, 1995
5436590 Digital FSK demodulator with automatic offset cancellation Jul. 25, 1995
5420888 System and method for split phase demodulation of frequency shift keyed signals May. 30, 1995
5418489 Method of recovering a frequency modulated signal May. 23, 1995
5414736 FSK data receiving system May. 9, 1995
5406629 Apparatus and method for digitally processing signals in a radio frequency communication system Apr. 11, 1995
5406584 Time shift keying digital communications system Apr. 11, 1995
5400365 Isk receiver Mar. 21, 1995
5373246 Digital FFSK demodulator Dec. 13, 1994
5373533 FSK signal receiving device Dec. 13, 1994
5351249 Trellis coded FM digital communications system and method Sep. 27, 1994
5345187 Dual frequency demodulation apparatus for frequency shift keyed (FSK) data signals and FM signals and method therefor Sep. 6, 1994
5345473 Apparatus for providing two-way communication in underground facilities Sep. 6, 1994

1 2 3 4 5 6 7 8 9










 
 
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