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Class Information
Number: 375/306
Name: Pulse or digital communications > Transmitters > Angle modulation > Frequency shift keying > One oscillator
Description: Subject matter where the modulated carrier wave is generated by altering the frequency of an oscillator in the transmitter.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
6498823 Variable rate modulator Dec. 24, 2002
6434135 Adaptive RF amplifier prelimiter Aug. 13, 2002
6434187 Digital radiofrequency transceiver Aug. 13, 2002
6392499 Frequency shift modulation circuit May. 21, 2002
6385256 Method and arrangement for signal modulation May. 7, 2002
6317009 Frequency shift key modulating oscillator Nov. 13, 2001
6298093 Apparatus and method for phase and frequency digital modulation Oct. 2, 2001
6288618 Logic-based architecture for FSK modulation and demodulation Sep. 11, 2001
6275539 System and method for modulating a frequency signal Aug. 14, 2001
6265948 Image rejection in logic-based architecture for FSK modulation and demodulation Jul. 24, 2001
6225873 Frequency shift key modulating oscillator May. 1, 2001
6163229 Frequency generator for generating two independent FSK signals Dec. 19, 2000
6133804 Transmitter with complex phase comparator Oct. 17, 2000
6018275 Phase locked loop with down-conversion in feedback path Jan. 25, 2000
5926093 Drive circuit for reactive loads Jul. 20, 1999
5889443 Frequency synthesizing circuit using a phase-locked loop Mar. 30, 1999
5883922 FSK communication device for digital information Mar. 16, 1999
5818880 MMIC telemetry transmitter Oct. 6, 1998
5793261 Saw stabilized FSK oscillator circuit Aug. 11, 1998
5789991 FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal Aug. 4, 1998
5732106 Pulse-shaping filter for modulator monolithic integration Mar. 24, 1998
5612650 Transmitting device for a frequency modulated digital transmission signal Mar. 18, 1997
5532654 FSK modulator using saw resonator with switchable capacitors Jul. 2, 1996
5485129 Method and apparatus for digital modulation using pulse deletion Jan. 16, 1996
5446421 Local oscillator phase noise cancelling modulation technique Aug. 29, 1995
5436599 Method and apparatus for digital modulation using pulse addition Jul. 25, 1995
5398031 DTMF signal generating circuit Mar. 14, 1995
5367537 Saw-based FSK modulating circuit Nov. 22, 1994
5351273 Process and system for the transmission of a signal Sep. 27, 1994
5309479 Low Cost Ku band transmitter May. 3, 1994
5222076 Data communication apparatus and method with low power standby mode Jun. 22, 1993
5157358 High speed frequency agile FSK modulator Oct. 20, 1992
5155454 MSK modulator using a VCO to produce MSK signals Oct. 13, 1992
5053728 Phase locked loop frequency modulator using data modulated digital synthesizer as reference Oct. 1, 1991
5030928 Zero crossing modulator Jul. 9, 1991
4924482 Data-transmitting apparatus May. 8, 1990
4866771 Signaling system Sep. 12, 1989
4748640 Digital circuit with band limiting characteristics for modem May. 31, 1988
4573165 Transmission circuit for modems employing frequency shift keying Feb. 25, 1986
4567603 FSK Modulator and method for NRZ data transmission utilizing PLL frequency synthesis Jan. 28, 1986
4538136 Power line communication system utilizing a local oscillator Aug. 27, 1985
4516086 Frequency modulator for the transmission of analog data May. 7, 1985
4481489 Binary signal modulating circuitry for frequency modulated transmitters Nov. 6, 1984
4471170 Non-integer programmable counter Sep. 11, 1984
4461013 Frequency modulation transmitter for voice or data Jul. 17, 1984
4411005 Data circuit for frequency modulating an oscillator Oct. 18, 1983
4320522 Programmable frequency and signalling format tone frequency encoder/decoder circuit Mar. 16, 1982
4317209 FSK Tone generator circuit Feb. 23, 1982
4160121 Frequency shift keyed tone generator Jul. 3, 1979
4103238 Transmitter modulated with three modulation patterns Jul. 25, 1978

1 2 3










 
 
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