Matches 1 - 50 out of 105 1 2 3 >
Match Document Document Title
7340280 Method of configuring base station, and base station  
A base station and a method of configuring a base station are provided in a cellular telecommunication system, wherein the base station comprises an electrically tunable duplex filter with a tuning...
7308238 Automatic frequency controlling apparatus and method of mobile communication terminal  
An apparatus and method for performing automatic frequency control of a mobile communication terminal detects a current peak position value from a downlink pilot signal and then calculates a...
7145970 Frequency offset detector for AFC under rayleigh fading  
A frequency offset detector for AFC under Rayleigh fading. The AFC includes a variable phase generator, an exponential term e j Δ107 t multiplied on an incoming signal, a low-pass filter, a gain...
7050802 Cellular communication device with scanning receiver and continuous mobile communication system employing same  
A receiver receives communication signals on an assigned frequency channel while monitoring the signals received on other frequency channels. A communication processor processes the received...
6985705 Radio frequency control for communication 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...
6816715 Wideband receiver and channel scanning method  
A wideband receiver ( 10 ) comprises a frequency converter ( 16 ) for converting the frequency of a signal inputted through an antenna ( 12 ) by using a local oscillation signal from a local...
6798853 System and method for compensating for frequency offset  
The present invention is directed toward an automatic frequency control system for compensating for frequency offset of received data signals in a radio frequency communication system. A reference...
6735428 Wireless communication apparatus  
A wireless communication apparatus prevents desensitization in a line signal frequency caused by clock signal harmonic. The wireless communication apparatus is provided with a receiver/demodulator...
6704552 Mobile communication apparatus with an automatic frequency controller  
A plurality of finger units despread a received signal with a first spread code to output pilot signals of a receiving channel which has been spread with the first spread code. An AFC unit...
6640093 Broadcast receiver  
A receiver for broadcast signals, e.g. DAB, FM, DVB, and digital or analog short-wave RF broadcast signals according to the present invention includes a polyfunctional circuit ( 5 ) that can be...
6631255 Multi-carrier receiver for a wireless telecommunication system  
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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...
6535553 Passband equalizers with filter coefficients calculated from modulated carrier signals  
A digital communications radio receiver, as for television, digitizes a final intermediate-frequency signal offset from zero frequency no more than a few megahertz. This digitized final I-F signal...
6493544 FM signal quality detector during seek  
A vehicle radio includes a microprocessor-controlled tuner having a seek function. The tuner generates a station detect signal when a sufficiently strong signal is received, and the tuner also...
6366765 Receiver  
The present invention intends to provide a receiver which receives a signal by switching a plurality of communication systems, wherein a circuit scale is reduced to intend to the miniaturization of...
6314145 Tracking carrier timing  
The timing of a carrier signal is tracked in a receiver. The receiver receives a signal produced by a transmitter having a single frequency source which is used to generate a reference clock...
6275699 Mobile communication terminal for rapid adjustment of a reference frequency to a target frequency  
In a mobile communication terminal, a switch 10 is initially set to an initial setting mode at time of turning on a power supply. A reference oscillator control circuit is initialized, and in this...
6252635 Automatic tuning frequency or channel number installation  
Upon installation of a broadcast receiver, for example, a television receiver, the different tuning frequencies/channel numbers are to be stored in a memory of the broadcast receiver. To facilitate...
6192088 Carrier recovery system  
A digital carrier recovery system includes at least two modes of operation, namely, an acquisition mode and a tracking mode. The bandwidth of the carrier recovery loop filter is different for the...
6181923 Automatic frequency control circuit and method of automatic frequency control  
The present invention relates to the automatic frequency control circuit and the method of automatic frequency control. The automatic frequency control circuit for processing frequency control of a...
6038433 Method for automatically searching a frequency range for signal channels in a receiver for digitally modulated signals, and receiver for applying such a method  
A method for automatically searching a frequency range for signal channels in a receiver for digitally modulated signals is described, each channel having a center frequency, a symbol rate, and a...
5933059 Method and apparatus for controlling frequency synchronization in a radio telephone  
A method and apparatus for controlling frequency synchronization in a frequency correction feedback loop of a radio telephone. A processor in a frequency update controller ascertains...
5751772 Method for locating a channel in a communication system  
A method for locating a carrier (220) includes the steps of tuning to a first anticipated carrier location (240) within a first subband division (216), attempting to locate the carrier (220) at the...
5724105 Television signal receiver  
A video detection unit is provided with a first control loop including a phase detector for comparing phases between the output of a voltage-controlled oscillator and the carrier of a VIF signal to...
5699385 Method and apparatus for locating and tracking a QPSK carrier  
In a receiver for receiving a carrier modulated with data, there is provided a system for locating and tracking said carrier. The carrier is located by sweeping a frequency range containing said...
5696797 Demodulator with baseband doppler shift compensation and method  
An apparatus and accompanying method for demodulating with baseband Doppler frequency shift compensation. An RF section (20) down-converts received data communication signals (12) to baseband. A/D...
5612977 Automatic frequency control circuit for a receiver of phase shift keying modulated signals  
A frequency control circuit for a receiver of phase shift keying (PSK) modulated signals comprises intermediate frequency (IF) signal generation circuit for generating an IF signal from a local...
5606731 Zerox-IF receiver with tracking second local oscillator and demodulator phase locked loop oscillator  
A zero-intermediate frequency receiver circuit (11) for receiving a radio frequency signal detected by an antenna (14). The receiver circuit (10) comprises a second local oscillator circuit (25)...
5532683 Paging receiver and radio frequency channel searching method for the same  
A paging receiver is provided for use with a plurality of paging service systems transmitting different radio frequency channels. The paging receiver searches for every reception channel and...
5500878 Automatic frequency control apparatus and method therefor  
An automatic frequency control apparatus includes a local oscillator, a quadrature detector, a frequency offset value estimation circuit, a demodulation circuit, a synchronization determination...
5495506 Automatic frequency control apparatus  
An automatic frequency control apparatus includes a frequency converter, an analog/digital converter, extractor, a storage unit, a controller, and a local oscillator. The storage unit stores unique...
5369790 Radio receiver  
A portable receiver provides an output of a local oscillator to a mixer for converting the received signal from an antenna to an intermediate frequency so that the intermediate frequency signal is...
5249202 Radio communication  
In a transparent tone-in-band (TTIB) single-sideband-modulated communication system used to communicate digital data; to compensate for variations due, eg, to doppler shift of the pilot tone in the...
5233633 Automatic frequency control by an adaptive filter  
The process of the present invention generates an optimum automatic frequency control signal in an apparatus that has a plurality of adaptive algorithms, each adaptive algorithm having a reference...
5233425 Adaptive AFT system with variable step resolution  
A frequency synthesis tuner for a television receiver includes a voltage controlled oscillator (VCO) responsive to a phase locked loop (PLL) for generating a local oscillator signal which is used...
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...
5163161 Fast scanning radio receiver with frequency data base management by remote processor  
A scanning receiver includes an Electrically Erasable Programmable Read Only Memory (EEPROM) as massive nonvolatile storage for frequency control words. The receiver includes a microprocessor based...
5140701 Carrier signal detection circuit featuring a wide range of signal/noise performance  
A carrier frequency lock detection circuit receives a baseband signal from a tuning control loop of a receiver. The baseband signal is sent to a comb-filter network which has a plurality of...
5134720 Signal locating apparatus  
A signal locating apparatus for locating within a frequency band an input signal of a first frequency, the signal locating apparatus including a signal receiver for receiving the input signal. The...
4959872 Automatic frequency control apparatus for FM receivers  
An automatic frequency control apparatus for an FM receiver. The apparatus includes a local oscillator for generating a local oscillation signal which frequency is controlled in response to a...
4941050 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  
A television receiver has an a.f.c. arrangement for ensuring the correct tuning of a tuner unit (4) which is tuned to the nominal carrier frequency by a tuning voltage (VT). When the tuner unit (4)...
4932074 Rapid scanning radio with multi-mode local oscillator control  
A rapid scanning radio with multi-mode local oscillator control. In one embodiment a phase-locked loop is closed for tuning to all frequencies of interest, and each time the loop locks a DAC is...
4919640 Auto tuning apparatus  
An auto tuning apparatus sequentially varies the value of N, a positive integer, in the frequency-dividing ratio 1/N of a variable frequency-dividing circuit incorporated in a local oscillating...
4792988 Radio receiving circuit with a search tuning mechanism  
A radio receiving circuit provided with a search tuning mechanism. A broadcasting radiowave signal is received during a search tuning operation, and a shift amount of frequency produced in...
4780909 Signal receiver having automatic frequency characteristic adjusting capability  
A signal receiver generates a reference signal that sweeps frequencies of desired channel bands, and then feeds the reference signal to an input terminal of receiver unit via a signal-switching...
4691377 Automatic frequency and gain control circuit  
An AFC/AGC circuit utilized in a receiving apparatus of a ground station for the satellite communication system comprising a digital AFC/AGC controller functioning such that; when the pilot...
4592094 Receiver comprising a search tuning circuit having means for finding the tuning data of a search-tuned transmission after manual tuning  
In a receiver comprising a forward-reverse-stop search tuning circuit (43, 33, 35, 23, 19, 13) and a manual control circuit (37, 33, 35), a last-found transmission blocking circuit (45) is used...
4429415 Signal-seeking tuning system with signal loss protection for a television receiver  
A signal-seeking tuning system for a television receiver scans the VHF and UHF signal bands until a present TV channel signal is detected. Tuning voltage is developed by a digital-to-analog...
4419767 Automatic digital control device for exact frequency tuning of a receiver  
In a voltage synthesizer type receiver in which the tuning frequency is varied in first and second directions and in which a tuning frequency is automatically obtained in response to detuning...
4406018 Automatic FM tuner  
In an automatic FM tuner of a voltage synthesizer in which an output from a voltage control oscillator is varied in response to a tuning clock pulse to scan or search a broadcasting frequency...
Matches 1 - 50 out of 105 1 2 3 >