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Class Information
Number: 375/337
Name: Pulse or digital communications > Receivers > Angle modulation > Frequency shift keying > Separate mark and space channels
Description: Subject matter in which one frequency is received over one channel and the other frequency is received over another separate channel within the receiver.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7221711 |
Multilevel data encoding and modulation technique |
May. 22, 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 |
| 6782353 |
Instrument for measuring characteristic of data transmission system with high accuracy and clock reproducing circuit used therefor |
Aug. 24, 2004 |
| 6707858 |
Low IF receiver |
Mar. 16, 2004 |
| 6430218 |
Communication control apparatus |
Aug. 6, 2002 |
| 5351273 |
Process and system for the transmission of a signal |
Sep. 27, 1994 |
| 5214641 |
Mixed analog digital secondary channel FSK modem |
May. 25, 1993 |
| 5081644 |
Spread spectrum receiving device |
Jan. 14, 1992 |
| 5065409 |
FSK discriminator |
Nov. 12, 1991 |
| 4935940 |
Interference-proof reception of radio signals using frequency hopping techniques |
Jun. 19, 1990 |
| 4825452 |
Digital FSK demodulator |
Apr. 25, 1989 |
| 4814717 |
FSK frequency discriminator for a coherent optical transmission system |
Mar. 21, 1989 |
| 4759080 |
Coherent optical communication system with FSK heterodyne or homodyne detection and little influence by distortion of a modulated optical signal |
Jul. 19, 1988 |
| 4726041 |
Digital filter switch for data receiver |
Feb. 16, 1988 |
| 4715045 |
System protocol for composite shift keying communication system |
Dec. 22, 1987 |
| 4577333 |
Composite shift keying communication system |
Mar. 18, 1986 |
| 4568882 |
Digital FSK demodulator circuit |
Feb. 4, 1986 |
| 4543547 |
Demodulation filter for a signal modulated in binary frequency manner |
Sep. 24, 1985 |
| 4523324 |
Direct modulation FM data receiver |
Jun. 11, 1985 |
| 4498198 |
Binary signal decoding apparatus and method |
Feb. 5, 1985 |
| 4464756 |
System for error detection in frequency shift keyed signals |
Aug. 7, 1984 |
| 4459474 |
Identification system with separation and direction capability and improved noise rejection |
Jul. 10, 1984 |
| 4409593 |
Threshold-less collision detection and bit arbitration in a CFSK data system |
Oct. 11, 1983 |
| 4355407 |
Device for disconnecting the receiver in case of a small signal-to-noise ratio for a digital-modulated radio system |
Oct. 19, 1982 |
| 4333150 |
Signal receiving apparatus and method |
Jun. 1, 1982 |
| 4291275 |
Frequency demodulation system |
Sep. 22, 1981 |
| 4290140 |
Combined coherent frequency and phase shift keying modulation system |
Sep. 15, 1981 |
| 4254503 |
Radio receiver for tone modulated signals |
Mar. 3, 1981 |
| 4247943 |
Piecewise coherent, combined frequency and phase-shift-keyed signal demodulator |
Jan. 27, 1981 |
| 4234852 |
Coherent frequency shift key demodulator |
Nov. 18, 1980 |
| 4156194 |
Frequency-shift-keyed receiver |
May. 22, 1979 |
| 4054842 |
Channel gain imbalance compensation for FSK demodulator |
Oct. 18, 1977 |
| 4011511 |
Frequency-shift digital data link and digital frequency detection system |
Mar. 8, 1977 |
| 3947769 |
Threshold correction system in FSK transmissions |
Mar. 30, 1976 |
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