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Match Document Document Title
7376446 Mobile communications network with expanded carrier capacity and method of expanding base station carrier capacity  
A base station for a mobile communications system, a mobile communications system including the base station and a method of increasing base station capacity. Each base station antenna is coupled...
7295822 Radio wave receiver, radio-controlled timepiece and tuning capacitance setting method  
A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which...
7236755 Broadcast wave receiving apparatus  
Herein disclosed is a broadcast wave receiving apparatus, comprising: first and second tuning circuits each having a resonance frequency; first controlling means for controlling one of the first...
7190753 Method and apparatus for temporally correcting a data signal  
A data signal is detected and compared with a reference value. A displacement time is determined as a function of the difference between the reference value and the signal level of the data signal....
7171181 Method for achieving immediate and accurate automatic frequency tuning  
An automatic frequency tuning (AFT) system which can effect immediate and accurate automatic frequency tuning of the local oscillator (LO) of a receiver, in order to achieve a stable intermediate...
7155186 AM receiver with controllable RF input circuit  
AM receiver comprising an RF input circuit for receiving an RF AM signal, demodulation means providing an audio signal carried by said RF AM signal as well as automatic gain control means for...
7151909 Broadcasting information receiving apparatus and broadcasting information receiving method  
A broadcast information receiving apparatus, comprising: a broadcast service receiving section for receiving a plurality of broadcast services from a broadcast information source; and an...
7120407 Receiver and its tracking adjusting method  
A receiver such that the period required for tracking adjustment, temperature compensation is not needed, and tracking errors due to fluctuation of the power supply voltage are prevented from...
7062240 Automatic frequency control processing in multi-channel receivers  
A multiple channel receiver ( 200 ) includes a communications receiver synthesizer ( 204 ) and at least one numerically controlled oscillator (NCO) ( 406 ) that produce local oscillator signals...
7027787 Automatic frequency control system, operation control method thereof and mobile communication device using the same  
In a mobile communication device, communication can be resumed upon next communication without causing problem even when an AFC control signal becomes abnormal upon interruption of communication....
6980775 Automatic frequency control (AFC) system and method using an adaptive threshold to improve accuracy of the direct current (DC) component calculation for a received signal  
A radio device requires a tunable transceiver such that the transceiver can be accurately set to a desired frequency. When a signal with known frequency accuracy is being received, an offset...
6920316 High performance integrated circuit regulator with substrate transient suppression  
A regulation circuit, incorporated in a single integrated circuit with a first circuit load, which as an input coupled to a power supply which produces a source voltage, and a first output coupled...
6834183 VCO gain tracking for modulation gain setting calibration  
Voltage controlled oscillator (VCO) gain tracking is used for programming modulation gain settings to minimize modulation distortion in a phase locked loop of a mobile station ( 10 ). A synthesizer...
6807406 Variable gain mixer circuit  
In accordance with embodiments of the present invention, a receiver system is provided with a variable gain mixer circuit that is advantageous over current architectures used in wireless...
6718167 Filter center frequency temperature compensation by adjustment of the operating frequency of the host system  
An electronic circuit includes a frequency conversion device ( 4 ), an oscillator ( 6 ), a band-pass filter ( 8 ), and a controller ( 14 ). The oscillator ( 6 ) is connected to the frequency...
6571088 Automatic frequency control circuit  
In an AFC ((Automatic Frequency Control) circuit, a frequency offset estimating circuit ( 11 ) produces a lock signal ( 102 ) if a calculated frequency error becomes smaller than a predetermined...
6463266 Radio frequency control for communications systems  
The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with...
RE37326 HDTV receiver  
An HDTV receiver is disclosed including a tuning portion for selecting one of a plurality of RF signals received, and converting a selected RF signal into an intermediate frequency signal; a...
6173164 Method and apparatus for wide range automatic frequency control  
A method and apparatus for wide range automatic frequency control. A control signal indicating a frequency within one of a plurality of frequency bands is received by an oscillator. In response,...
6163687 Tuning module for a dual frequency PLL synthesized tuner  
A tuning module tunes a dual frequency PLL synthesized tuner to a desired channel frequency. The dual frequency PLL synthesized tuner includes a first PLL and a second PLL. The tuning module...
6148187 Automatic frequency control method and circuit  
The invention provides an automatic frequency control (AFC) method and circuit for use with a receiver by which deterioration of the reception characteristic of the receiver due to frequency error...
5913155 Broadcasting signal receiving apparatus and pulse counting demodulators  
A broadcasting signal receiving apparatus includes a first signal receiving portion for receiving selectively frequency-modulated broadcasting signals to obtain a frequency-modulated intermediate...
5781851 Heterodyne receiver  
A heterodyne receiver of the present invention is of a heterodyne system including a voltage controlled circuit and a phase locked loop circuit. The receiver further includes a tuned voltage signal...
5678223 Method and apparatus for an automatic frequency control receiver  
A receiver circuit (10), and method for automatic frequency control of a receiver circuit (10) suitable for receiving a radio frequency (RF) signal, featuring determination of at least one...
5668715 Multiple output, zero voltage switching, series resonant VHF inverter  
VHF DC to AC inverters which include switching circuitry (13, 115, 125) and multiple resonant waveshaping networks (C11, L11, C12; C21, L21, C22; C111, L111; C221, L221; C331, L331; C441, L441)...
5575001 Direct broadcasting satellite tuner with a negative feedback and image compression circuit  
A dual-input DBS (direct broadcasting satellite) tuner having a negative feedback & image compression circuit. Radio frequency input signal (950 MHZ-2050 MHZ) is amplified and converted into an...
5552838 Apparatus for tuning offset signals by controlling a tuner based on a difference in frequency of signals tuned by that tuner  
A frequency counter obtains frequency data by measuring the frequency of an optionally offset broadcast signal tuned by a tuner having a VCO. A microprocessor is used to determine the frequency...
5483662 Spade signal receiving station  
In an earth-based receiving station for receiving radio signals transmitted from a satellite relay station, a common first frequency converter and at least two receivers are provided. One of the...
5321852 Circuit and method for converting a radio frequency signal into a baseband signal  
A device for converting a radio frequency signal directly to a baseband signal includes: a receiving section having a tuner for providing a tuned radio frequency signal and a phase-locked loop for...
5303398 Stability detection method and apparatus for a tuning system  
An indication of stability of a tuning system after changing, the local oscillator frequency to a predetermined frequency, such as a frequency corresponding to a new channel during a channel...
5245437 Method for selecting channels in a video system using a national television system committee (NTSC) system  
Disclosed is a method a method for selecting channels for all local broadcasts which employ the NTSC system. The improvement is capable of selecting channel 5A which is not selected by the...
5231390 Selective call receiver with decoder controlled filters  
A selective call receiver (100) includes a receiver (1104) for receiving a signal. The receiver (104) includes a controlled filter (142) having a variable frequency response. A decoder (106)...
5212554 Digital method and apparatus for evaluating a frequency parameter of an IF signal  
A tuning system of a television receiver includes a digital automatic fine tuning (AFT) unit for generating a digital AFT signal representing the deviation of the frequency of the picture carrier...
5203031 AM radio receiver with improved tracking  
An AM radio receiver includes an automatic tuning circuit for setting an automatic tuning mode. A radio frequency circuit produces a tuned signal and an untuned signal. A selector receives the...
5155862 FM receiver having variable IF filter  
In an FM receiver where the center frequency of an IF filter is varied depending on the received signal, an arrangement is described where the bandwidth of the variable IF filter is changed...
5152005 High resolution frequency synthesis  
The synthesizer includes an output PLL having a divide-by-N1 divider in its feedback loop. The output PLL is couples through frequency offset circuitry to receive a reference signal from a driver...
5132799 Frequency synthesizer-type television signal receiving apparatus comprising AFT function and controlling method therefor  
A PLL frquency synthesizer system television signal receiving apparatus includes a tuner, a control circuit for controlling a channel selecting operation by the tuner, and an intermediate frequency...
5125106 Switching control apparatus for tuning system  
A switch control apparatus for a tuning system includes a station selecting unit which has an analog to digital converter to which a first signal indicative of the reception state of a receiver and...
4989263 Radio receiver with automatic mode changeover circuit  
A radio wave receiver has a signal generator for generating a binary code signal indicative of the level of electric field intensity of a received radio wave. The binary code signal is fed to an...
4903329 Clamping circuit for a PLL tuning system  
An AM Stereo receiver is described which includes an AGC having an output which indicates whether the received signal has significantly decreased in level and having a clamping circuit for...
4879757 Tweet elimination, or reduction, in superheterodyne receivers  
In a superheterodyne receiver which employs a frequency synthesizer to generate local oscillator (LO) frequencies, there is provided apparatus which determines when an undesirable frequency...
RE32686 Digital frequency lock tuning system  
A tuning system for use in radio frequency multi-signal receiving systems, e.g. a CATV converter, utilizes a closed feedback loop digital arrangement for channel selection (local oscillator...
4703520 Radio transceiver having an adaptive reference oscillator  
A reference oscillator (21) suitable for use in a radio transceiver having a phase locked loop FM detector (12). During normal reception operation, the reference oscillator (21) can be controlled...
4696056 Frequency converting circuit  
A frequency converting circuit converts an input frequency into a desired frequency. To obtain the desired frequency, a first frequency converter converts the input frequency, by using an output...
4531233 Variable increment tuning select  
A tuning control for an aircraft radio apparatus is disclosed for a variety of applications wherein a single control provides a coarse tuning increment and, having the direction of movement of the...
4521916 Frequency synthesis tuning control system for a double-conversion tuner  
The tuning control system of a double-conversion tuner includes a phase locked loop type of frequency synthesizer for controlling the frequency of a controllable oscillator comprising the first...
4466127 Entry apparatus of digital value in memory  
A radio receiver having a counter which generates a count value corresponding to the frequency of a station to be received which value is stored in a memory through a load enable signal produced...
4461037 Automatic tuning system for television receiver  
An automatic tuning system for a television receiver. A first binary-coded signal circuit comprising a plurality of comparators for encoding in a binary signal a signal output from a frequency...
4454607 FM Stereophonic receiver with CPU controlled tuning and demodulating  
An FM stereophonic receiver is arranged so that a central processing unit assigned for selection of a broadcasting station is burdened, based on a clock pulse of the central processing unit, to...
4419769 Digital tuning system for a varactor tuner employing feedback means for improved tuning accuracy  
A tuning system for use in a communications receiver having a varactor tuner includes an alterable, non-volatile memory having a plurality of memory locations, each of which is capable of storing a...
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