Matches 1 - 47 out of 47
Match Document Document Title
7295821 Multiple base station automatic frequency control architecture in wireless communication system  
An automatic frequency control (AFC) system applies in a mobile station for automatically controlling a local frequency signal to be substantially synchronized with an input signal which is a first...
7283794 Low voltage digital interface  
A system is disclosed for interfacing a wireless communication device baseband module and a radio frequency integrated circuit. The system accepts a control signal from the baseband module. The...
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...
7167697 Reverse electronic tuning circuit for FM radio frequency-lock-loop circuits  
An electronic circuit having reverse scan tuning comprises an IC radio having the forward scan function, in which a VCO capacitor is connected in parallel to a series connected resistor and switch,...
7095993 Frequency auto-correction apparatus for CDMA multipath fading channel  
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier...
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...
6941120 Apparatus and method for automatically programming frequency scanning radio receivers  
A frequency scanning radio receiver scans and receives transmissions on discrete radio frequencies. The frequency scanning radio receiver is programmable to monitor frequencies in a geographical...
6847807 Transmission circuit and radio transmission apparatus  
A modulator receives an I-phase transmission data signal and a Q-phase transmission data signal, which have been spread-spectrum processed, and modulates an intermediate frequency signal in...
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...
6192223 Apparatus and method for automatically programming frequency scanning radio receivers  
A frequency scanning radio receiver programming system includes a frequency scanning radio receiver that scans and receives transmissions on discrete radio frequencies. The frequency scanning radio...
6175722 Initial frequency synchronization mechanism  
Method for acquiring frequency of a desired channel having a carrier frequency F MAIN , for a dynamic receiver frequency F MOBILE , from a starting frequency F START , in the presence of high power...
6144843 Receiver having a commanded-tuning loop and a self-tuning loop  
In a tuning method, a commanded-tuning loop (CTL) tunes a receiver (REC) on the basis of a tuning command (TC) and a self-tuning loop (STL) tunes the receiver on the basis of a reception signal. To...
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...
5956376 Apparatus for varying a sampling rate in a digital demodulator  
A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides 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...
5732336 Receiver  
A reception clock signal used for a data sampling unit to sample received data is generated by a reception clock generator based on a reference clock signal, which is generated by a reference clock...
5621767 Method and device for locking on a carrier signal by dividing frequency band into segments for segment signal quality determination and selecting better signal quality segment  
The present invention provides a method and device for locking onto a carrier signal located within a frequency band of a digitally modulated analog signal. More particularly, the method includes...
5517678 Satellite radio receiver  
A satellite radio receiver obtains signals from a satellite receiving installation comprising one or more frequency converters which may, for example, undergo a frequency drift as a result of...
5511235 Apparatus for detecting a signaling channel during scanning including a controlled frequency converter circuit and a controlled filter bandwidth, and a method therefor  
A receiver has a channel scan mode of operation and a communication mode of operation. In the channel mode of operation, the passband of a filter is narrowed relative to the passband of the filter...
5509034 Frequency synchronizing method for a reference oscillator  
A method and apparatus of frequency synchronization is described for a reference oscillator. Using a reference oscillator set to a first frequency, the process begins by scanning for a radio...
5450621 Radio receiver with digital control loop for coarse frequency acquisition and analog control loop for frequency lock-in  
Manually tunable analog receivers with AFC have the drawback that the AFC exhibits hysteresis and that in the event of fading pulling to an adjacent station may occur, whereas receivers with PLL...
5341402 Automatic frequency control method and device for use in receiver  
An automatic frequency control method for use in a receiver mixes a received signal and a local oscillator signal to produce an intermediate frequency signal and converts the intermediate frequency...
5311318 Double conversion digital tuning system using separate digital numbers for controlling the local oscillators  
A double conversion tuning system for a high definition television receiver includes a microprocessor supplying first and second digital numbers to first and second local oscillators. The first...
5212817 Ultra high speed scan system  
A high speed scanning radio has conventional RF amplifier, a mixer, a frequency synthesizer for the generation of local oscillator signals, an IF amplifier, a demodulator, and an audio output...
5203030 Satellite transmission capturing method for GPS receiver  
A satellite transmission capturing method for the GPS receiver whereby PLL operation is stopped until the demodulation intensity of a demodulator reaches a predetermined level. The frequency of the...
5179725 Voltage controlled oscillator with correction of tuning curve non-linearities  
A scanning-superhetrodyne ESM receiver having a VCO for a local oscillator which is linearized and temperature compensated. A stable combline oscillator is used to generate known frequency signals...
5065244 Automatic fine tuning circuit  
During channel selection on automatic fine tuning (AFT) operation is carried out over a period longer than one vertical scanning period.
5014348 Self-programming scanning radio receiver  
Self-programming scanning receiver having superheterodyne circuitry, microprocessor controlled synthesized frequency tuning circuitry, frequency validation means, a learn mode to invoke the...
4903328 Automatic frequency sweeping method for controlling a frequency synthesizing type autotuner  
An automatic frequency sweeping method for controlling frequency synthesizing type autotuners for broadcasting receivers comprises a first intermediate frequency counting method in which the...
4881073 Paging system with dynamically programmable reception frequencies  
A paging network is disclosed which utilizes a plurality of distributed switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches...
4823387 Television tuning system with provisions for tuning RF signals with scrambled video information  
A tuning system for tuning non-standard frequency RF signals which utilizes searches for non-standard RF signals by examining both a synchronization component and an AFT signal at each of a...
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...
4736456 Tuning system for television sets  
An automatic alignment system for the tuner of a television receiver with a controlled high-frequency preamplifier stage and an intermediate-frequency amplifier that has a reference circuit with a...
4727591 Microprocessor controlled tuning system  
A tuning system receives signals from a radio frequency source and supplies an intermediate frequency signal to a signal detector under the control of a microprocessor. The microprocessor reads a...
4715001 Extremely accurate automatic frequency control circuit and method therefor  
An automatic frequency control circuit having the ability to resolve the frequency of an incoming signal to an extreme level of accuracy and to tolerate amplitude and pulse modulation on the...
4594611 Station selecting method for television receiver  
A method for tuning a television receiver in which an optimum local oscillator frequency is selected for offset stations. A local oscillator frequency of the receiver is incremented in steps of a...
4498191 Digital automatic frequency control with tracking  
A microprocessor controlled phase locked loop tuning system is disclosed which uses a single AFC detector whose threshold is controlled by the microprocessor. The system comprises a microprocessor...
4476580 Automatic continuous tuning control apparatus for a receiver  
A tuning control apparatus of a receiver having an electronic tuner comprises a tuning voltage generating circuit including a window comparator, a charge pump and a low-pass filter. An S curve...
4387401 Carrier detector apparatus useful in a multiband sweep type tuning system  
In a sweep type tuning system capable of sweeping through a desired range of carrier frequencies selectively in one of two directions, a carrier detector includes a discriminator for generating a...
4374437 Variable ramp speed TV tuning system for rapid channel tuning  
Disclosed is a microcomputer-controlled frequency synthesis television tuning system utilizing variable tuning ramp speeds following channel selection. Channel tuning is expedited by means of three...
4373208 Circuit arrangement for tuning into one of a number of radioelectric signals  
A circuit arrangement for tuning into one of a number of radioelectric signals receivable on a signal receiver set is provided in accordance with the teachings of the present invention. The circuit...
4367558 Method for automatically searching for an RF station  
A method of automatically searching for an RF carrier uses a synthesized frequency. The synthesized frequency is generated by a voltage controlled oscillator which is part of a phase locked loop....
4302778 AFT-wide automatic frequency control system and method  
An indirect frequency synthesis, microcomputer-controlled tuning system utilizing a frequency stepping process to tune to a selected channel frequency is disclosed. AFC discriminator information...
4291413 Search type tuning system with direct address channel selection apparatus  
A signal seeking tuning system includes provisions for allowing the direct selection of channels. It includes a memory for storing lower and upper boundaries of a tuning control voltage range for...
4222121 Frequency synthesizer type receiver having a channel selection device  
A frequency synthesizer type receiver having a channel selection device which comprises a tuning sensor (40) generating a stop pulse when a radio wave from a broadcasting station is caught, a...
4216546 Frequency bandwidth tuning system and method  
An electronic system for scanning across a range of received signals and aining a digital representation of a predetermined position, for example, the mid-point, of the bandwidth of the received...
4211988 Search tuning system for television receiver  
A search tuning type channel detector system for television receivers. When AFC voltage of a tuner has attained a first predetermined voltage level, frequency sweeping direction for tuning is...
Matches 1 - 47 out of 47