Patents
Patents for H03J 7 - Automatic frequency control; Automatic scanning over a band of frequencies (3,745)
04/1991
04/30/1991US5012235 Paging receiver with continuously tunable antenna and RF amplifier
04/16/1991US5008955 Receivers with microcomputer controlled tuning
04/03/1991EP0420275A2 Automatic frequency control method and receiving apparatus using thereof
04/02/1991US5004989 Oscillator for controlling a mixer stage in a tuner
03/1991
03/26/1991US5003621 Direct conversion FM receiver
03/26/1991US5003397 Television receiver including a tuning circuit which comprises a frequency synthesis circuit
03/06/1991EP0415610A2 Radio receiver
03/05/1991US4998217 Sweep generator linearization system and method
02/1991
02/21/1991DE3926984A1 Car radio and cassette player - monitors radio stations enabling automatic over riding of cassette player
02/19/1991US4995098 Adaptive scanning method
02/13/1991EP0412207A1 Automatic frequency control circuit
02/06/1991EP0411566A1 Automatic optical frequency acquisition and tracking apparatus for optical coherent communication system
02/02/1991WO1991002413A1 Radio receiver frequency control system
02/02/1991CA2064895A1 Radio receiver frequency control system
01/1991
01/29/1991US4989263 Radio receiver with automatic mode changeover circuit
01/16/1991EP0228433B1 Frequency dividing arrangements
01/09/1991EP0406851A2 Station selecting apparatus
01/02/1991CN1011106B Radio receiver having wide-band automatic gain controlling circuit
12/1990
12/30/1990WO1991000654A1 Low voltage afc switch
12/30/1990CA2064804A1 Low voltage afc switch
12/27/1990CA1278393C Television receiver
12/04/1990US4975775 Tuner for receiving television signal in frequency division multiplex system and television signal in time division multiplex system
12/04/1990CA1277373C Tweet elimination, or reduction, in superheterodyne receivers
11/1990
11/29/1990DE4002616A1 Scanning channels for programming memory in VCR or TV - memorising channel frequency when synchronising circuit is detected, and de-tunes circuit if not
11/13/1990US4970473 For tuning video frequencies
11/07/1990EP0396103A2 Channel selecting apparatus
10/1990
10/31/1990EP0395058A2 Method for automatically controlling optimal tuning point for receiving teletext
10/23/1990US4965853 Radio receiver circuit with tuning feedback control for a tunable bandpass filter
10/18/1990WO1990012457A1 Frequency control apparatus and method for a digital radio receiver
10/10/1990CN1046074A Frequency control apparatus and method for digital radio receiver
10/03/1990EP0389974A1 Frequency control apparatus and method for a digital radio receiver
10/03/1990EP0389493A1 Tvro receiver system with automatic bandwidth adjustment
09/1990
09/29/1990WO1990011653A1 Paging receiver with continuously tunable antenna and rf amplifier
09/29/1990CA2049969A1 Paging receiver with continuously tunable antenna and rf amplifier
09/26/1990EP0389012A1 Broadcast receiver for radio or television signals, including a memory for storing preset stations
09/25/1990US4959872 Automatic frequency control apparatus for FM receivers
09/19/1990EP0387294A1 Crystal controlled magnetron
09/11/1990US4956711 Automatic balancing system for communications receiver apparatus
09/05/1990EP0385147A2 Apparatus for controlling the reception capacity of radio alarm receivers
09/05/1990EP0315686A4 Dual port fm demodulation in phase locked receivers
09/04/1990US4955078 Frequency difference detector (FDD) having automatic gain control and a carrier modulated receiver including the FDD
09/04/1990US4955077 Radio with broad band automatic gain control circuit
09/04/1990US4955074 AFC apparatus with selection between average value mode and keyed mode
09/04/1990US4955073 Automatic search tuner
09/04/1990US4954785 Auto tracking notch filter using switched capacitors to measure harmonic distortion and noise contained in a signal source
08/1990
08/14/1990US4949091 Spectrum analysis arrangement and automatic interception receiving station comprising such an arrangement
07/1990
07/31/1990US4945415 Slew enhancement circuit for an automatic frequency control system
07/31/1990CA1272315A1 Cordless telephone
07/24/1990US4944025 Direct conversion FM receiver with offset
07/10/1990US4941204 Generating a stop signal of an automatic search procedure for a broadcasting station using an available AFC signal
07/10/1990US4941050 An afc arrangement for tuning a television receiving apparatus to a select transmission having an actual carrier frequency which differs from a nominal carrrier frequency
07/03/1990US4939473 Tracking harmonic notch filter
06/1990
06/28/1990WO1990007233A1 Digital automatic frequency control on pure sine waves
06/27/1990EP0375034A2 Oscillator for supplying a mixer stage in a tuner
06/20/1990EP0373517A2 Digital automatic frequency control on pure sine waves
06/19/1990CA1270582A1 Tracking yig tuned filter-mixer
06/19/1990CA1270529A1 System for automatically tuning the antenna of a miniature portable communications device
06/14/1990WO1990006627A1 A method and a device pertaining to an electro-mechanically controlled resonance module
06/13/1990EP0372430A2 Automatic antenna tuning
06/13/1990CN1043051A 自适应扫描方法 Adaptive scanning method
06/07/1990DE3840707A1 Control circuit for a broadcast receiver
06/05/1990US4932074 Rapid scanning radio with multi-mode local oscillator control
06/05/1990US4932072 Mobile station equipment for a mobile radio telephone system
05/1990
05/23/1990CN1042460A Satellite radio receiver
05/17/1990WO1990005410A1 Satellite radio receiver
05/09/1990EP0367214A1 Satellite broadcast receiver
05/08/1990US4924300 Method of and device for tuning a resonant circuit coupled to a frequency discriminator
05/01/1990US4921467 Local oscillators for radio receivers
04/1990
04/25/1990EP0364749A2 Radio receiver
04/24/1990US4919640 Auto tuning apparatus
04/18/1990EP0364035A2 Radio receiver circuit arrangement
04/17/1990CA1267980A1 Television tuning system with provisions for quickly locating active cable channels
04/05/1990WO1990003696A1 Tvro receiver system with automatic bandwidth adjustment
03/1990
03/29/1990DE3833164A1 Audio-abstimmsystem zum empfangen und abstimmen von adio-zwischentraegersignalen in einem tvro-system Audio-tuning to receive and vote of adio-zwischentraegersignalen in a TVRO system
03/27/1990US4912527 Optical apparatus for pulling an intermediate frequency in a predetermined frequency range
03/22/1990WO1990003069A1 Adaptive scanning method
03/20/1990US4910470 Digital automatic frequency control of pure sine waves
03/14/1990EP0357876A2 Method for the optimisation of the tuning of a transmitter, and arrangement for realising the method
03/13/1990US4908582 AFC circuit for producing a ripple-free oscillator control voltage
03/07/1990EP0148389B1 Tuning system for a television receiver
02/1990
02/28/1990CN1007030B Receiver provided with an automatic frequency control loop
02/21/1990EP0354986A2 A method and circuitry for automatic control, according to the counter principle, of the frequency of a radio telephone
02/20/1990US4903328 Automatic frequency sweeping method for controlling a frequency synthesizing type autotuner
01/1990
01/31/1990EP0352853A1 Television receiver including a tuning circuit which comprises a frequency synthesis circuit
01/30/1990USRE33157 Null initiated method and system for monitoring a priority channel
01/30/1990US4897727 Television tuning system allowing rapid response to user initiated commands
01/02/1990US4891708 Voltage superposing circuit for an electronic tuner
12/1989
12/20/1989EP0346623A2 A circuit for high-efficiency tuning video frequencies
12/12/1989US4887050 Frequency control apparatus and method for a digital radio receiver
12/06/1989EP0344991A2 AFC apparatus
11/1989
11/29/1989EP0343336A2 Automatic frequency control
11/23/1989EP0342728A1 Television receiving apparatus
11/23/1989EP0342277A1 Tweet elimination, or reduction, in superheterodyne receivers
11/15/1989EP0341238A1 Automatic antenna tuning system for portable communication devices.
11/07/1989US4879757 Tweet elimination, or reduction, in superheterodyne receivers
11/02/1989EP0339647A2 Apparatus for and method of receiving satellite broadcasting
10/1989
10/11/1989EP0336650A2 Self-programming scanning radio receiver
10/04/1989EP0335370A2 Automatic frequency control circuit
10/03/1989US4872207 Automatic IF tangent lock control circuit
09/1989
09/27/1989CN1035924A Radio station having wide-band automatic gain controlling circuit
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