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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
4287596 Data recovery system for use with a high speed serial link between two subsystems in a data processing system Sep. 1, 1981
4270208 Threshold generator May. 26, 1981
4254503 Radio receiver for tone modulated signals Mar. 3, 1981
4236249 Circuit arrangement for correcting frequency errors during a transmission of data Nov. 25, 1980
4229698 Tuning indicator Oct. 21, 1980
4197501 System for reception of frequency modulated digital communication signals Apr. 8, 1980
4193034 Radio receiver for FSK signals Mar. 11, 1980
4193033 Quadrature transposition stage Mar. 11, 1980
4151475 Compensation circuit for multi-path propagation distortion in binary frequency modulated signals Apr. 24, 1979
4114097 Frequency shift signal receiver Sep. 12, 1978
4065722 Demodulation method and circuit for discretely modulated ac signals Dec. 27, 1977
4054842 Channel gain imbalance compensation for FSK demodulator Oct. 18, 1977
4053836 Device for transmission of information by pulse code frequency shift modulation Oct. 11, 1977
4044202 Plural frequency signalling systems Aug. 23, 1977
RE29257 Digital filter for a digital demodulation receiver Jun. 7, 1977
4013965 Circuit for preventing errors in decoding information from distorted pulses Mar. 22, 1977
3996581 Hard copy tone address paging system Dec. 7, 1976

1 2 3 4 5 6 7 8 9

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