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Class Information
Number: 375/344
Name: Pulse or digital communications > Receivers > Automatic frequency control
Description: Subject matter where a receiver frequency response characteristic is set or adjusted in response to frequency changes in the input signal or charges in the receiver parameters.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5111162 |
Digital frequency synthesizer having AFC and modulation applied to frequency divider |
May. 5, 1992 |
| 5107522 |
Automatic frequency control circuit |
Apr. 21, 1992 |
| 5097487 |
Local oscillator signal generating system for digital demodulator |
Mar. 17, 1992 |
| 5093848 |
Method of controlling the frequency of a coherent radio receiver and apparatus for carrying out the method |
Mar. 3, 1992 |
| 5093847 |
Adaptive phase lock loop |
Mar. 3, 1992 |
| 5093846 |
Signal acquisition using modulation by a preselected code group |
Mar. 3, 1992 |
| 5091921 |
Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency |
Feb. 25, 1992 |
| 5081652 |
Offset correction |
Jan. 14, 1992 |
| 5077755 |
Digital signal processing system in modem |
Dec. 31, 1991 |
| 5072196 |
Costas loop carrier recovery device |
Dec. 10, 1991 |
| 5068875 |
Adaptive loop gain phase filter |
Nov. 26, 1991 |
| 5067141 |
Interpolator for varying a signal sampling rate |
Nov. 19, 1991 |
| 5067139 |
Coherent detector for QPSK modulation in a TDMA system |
Nov. 19, 1991 |
| 5062123 |
Kalman predictor for providing a relatively noise free indication of the phase of a carrier laden with noise |
Oct. 29, 1991 |
| 5058138 |
Modular receiver for signals having multiple channels and multiple formats |
Oct. 15, 1991 |
| 5042052 |
Carrier acquisition scheme for QAM and QPSK data |
Aug. 20, 1991 |
| 5031197 |
Timing error detector |
Jul. 9, 1991 |
| 5023889 |
Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels |
Jun. 11, 1991 |
| 5012491 |
Preamable detection circuit for digital communications system |
Apr. 30, 1991 |
| 5007068 |
Doppler-corrected differential detection system |
Apr. 9, 1991 |
| 4993048 |
Self-clocking system |
Feb. 12, 1991 |
| 4977580 |
Timing and carrier recovery in TDMA without preamble sequence |
Dec. 11, 1990 |
| 4961206 |
Data modem system |
Oct. 2, 1990 |
| 4959844 |
Clock recovery circuit for digital demodulator |
Sep. 25, 1990 |
| 4958360 |
Circuit for recovering the carrier in digital transmission systems |
Sep. 18, 1990 |
| 4956864 |
Receiver for communications satellite down-link reception |
Sep. 11, 1990 |
| 4955083 |
Dual mode radio transceiver for an SSB communication system |
Sep. 4, 1990 |
| 4953182 |
Gain and phase correction in a dual branch receiver |
Aug. 28, 1990 |
| 4947409 |
Apparatus for correcting frequency in a coherent receiver |
Aug. 7, 1990 |
| 4943982 |
Baseband carrier phase corrector |
Jul. 24, 1990 |
| 4941155 |
Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems |
Jul. 10, 1990 |
| 4937841 |
Method and circuitry for carrier recovery for time division multiple access radio systems |
Jun. 26, 1990 |
| 4916405 |
Smart sweep apparatus for data rate receivers |
Apr. 10, 1990 |
| 4896334 |
Method and apparatus for timing recovery |
Jan. 23, 1990 |
| 4896336 |
Differential phase-shift keying demodulator |
Jan. 23, 1990 |
| 4893317 |
Digital signals and frequency correction in a digital wireless system |
Jan. 9, 1990 |
| 4879728 |
DPSK carrier acquisition and tracking arrangement |
Nov. 7, 1989 |
| 4871974 |
Coherent phase shift keyed demodulator |
Oct. 3, 1989 |
| 4868539 |
Bi-directional multi-frequency ripple control system |
Sep. 19, 1989 |
| 4860320 |
Method for recovering a control signal for controlling the phase of a local carrier signal |
Aug. 22, 1989 |
| 4860321 |
Lock detector for feedback loops |
Aug. 22, 1989 |
| 4855689 |
Phase lock loop with switchable filter for acquisition and tracking modes |
Aug. 8, 1989 |
| 4856028 |
Low data rate communications link |
Aug. 8, 1989 |
| 4856027 |
Carrier recovery phase-locked loop |
Aug. 8, 1989 |
| 4852123 |
Nearly DC IF phase locked transceiver |
Jul. 25, 1989 |
| 4849998 |
Rate synchronized symbol timing recovery for variable rate data transmission systems |
Jul. 18, 1989 |
| 4847872 |
Method and arrangement for synchronizing a receiver in digital transmission systems |
Jul. 11, 1989 |
| 4843616 |
Method of obtaining a phase difference signal |
Jun. 27, 1989 |
| 4835792 |
Universal FM receiver for mobile communications |
May. 30, 1989 |
| 4827488 |
Demodulator for PSK-modulated signals |
May. 2, 1989 |
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