Class 348/735 - Automatic frequency control

Subclass of Class 348 - Television
Definition: Subject matter including a local oscillator combined with
No. of patents: 284
Last issue date: 05/01/2012

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Number	Title	Issue Date
8169551	Method and apparatus for adjusting center frequency of filter The present invention provides a method for adjusting a center frequency of a filter utilized for extracting information carried via a target channel. The method includes: detecting adjacent channel interference (ACI) for the target channel to generate a channel int...	05/01/2012
7430019	Apparatus to improve image sharpness adaptively according to multi-video formats and method thereof An apparatus to improve an image sharpness and a method thereof which can improve the image sharpness of an image through an adaptive operation of the apparatus according to resolutions of input/output video signals and an emphasis of edge portions of the image. The...	09/30/2008
7426368	Satellite broadcasting converter, control circuit incorporated therein, and detector circuit used in such control circuit In a broadcasting satellite converter adapted to be connected to a BS tuner and fed with a power supply voltage signal from the broadcasting satellite tuner, a receiver circuit includes a mixer, and a plurality of local oscillators connected to the mixer to convert ...	09/16/2008
7352412	Miniaturized television tuner and television receiver including the same A television tuner includes an IF output terminal for outputting an IF signal converted from a received television signal to an external source, and a channel-selection PLL circuit for converting a high voltage supplied from an external source to a tuning voltage an...	04/01/2008
7317926	Synchronous transmission of data with network remote control A novel method and apparatus is disclosed for synchronously delivering complementary data to two devices. Complementary data is used herein to designate at least two streams of related data that, when combined, form an organic whole. In one embodiment of the disclos...	01/08/2008
7305218	RF switch An RF switch is disclosed. Power of an amplifier installed in an RF switch of a TV receiver is adjusted by using a Schmitt trigger circuit. If an output voltage of an RF automatic gain controller of a tuner is greater than a pre-set upper limit threshold value, the ...	12/04/2007
7304689	Single chip tuner for multi receiver applications Tuners are adapted to accept a received signal input and provide both a desired tuner output and the received signal as an output. Accordingly, a single tuner circuit, preferably an integrated circuit, may be cascaded to provide a multiple tuner configuration. Any n...	12/04/2007
7302055	Discharging envelope detector A receiver to detect pulses on a home phone wiring network using envelope detection. The receiver comprises an integrating capacitor charged by a first current source responsive to a differential signal propagated on the wiring network, and discharged by a FET in co...	11/27/2007
7289566	Cable modem tuner An IF signal output from an IF amplifying circuit included in a tuner is converted to have a band width for transmission by an SAW filter and has unnecessary signals removed therefrom. Thereafter, the resulting signal has its gain made constant by an IFAGC circuit, ...	10/30/2007
7286190	Real-time signal strength measurement and display of digital television signals An HDTV receiver coupled to a terrestrial antenna displays real-time signal strength of terrestrial digital television signals. A graphical user interface preferably displays various data relating to all terrestrial television signals in a scrollable grid format. Th...	10/23/2007
7283059	Remote control multimedia content listing system A remote control multimedia content listing system for providing an updated content listing of various media within a remote control. The remote control multimedia content listing system includes a remote control having a housing, a display, a keypad, and an electro...	10/16/2007
7274410	Broadband integrated tuner A broadband integrated receiver for receiving input signals and outputting composite video and audio signals is disclosed. The receiver employs an up-conversion mixer and a down-conversion mixer in series to produce an intermediate signal. An intermediate filter bet...	09/25/2007
7266162	Carrier frequency offset estimator for OFDM systems A frequency offset estimator is employed that estimates the frequency offset in signal frames that include only binary Phase-Shift Keying (BPSK) carriers in OFDM systems. Specifically, the offset frequency estimator takes advantage of those OFDM systems in which som...	09/04/2007
7263341	Audio demodulating circuit and television broadcast receiver An audio demodulating circuit in accordance with the present invention for demodulating audio signals in a plurality of broadcast systems of mutually different frequency deviations such as the NTSC and the PAL, is arranged such that a connection between a trap circu...	08/28/2007
7262814	Method and device for installing broadcasting channels The invention relates to a device and a method of installing digital or analogue broadcasting channels of a frequency band, each channel being centred on a nominal frequency subject to drift or an offset. In this method, each chann...	08/28/2007
7239431	System and method for recovering primary channel operation in a facsimile receiver and facsimile machine incorporating the same A system for, and method of recovering primary channel operation in a facsimile (fax) receiver and a fax machine that incorporates the system, the method or both. In one embodiment, the system includes: (1) a signal receiver that receives a signal containing first a...	07/03/2007
7233590	Switched channel-band network Rather than restricting a stream of data to a single channel within a multi-channel link between a source node and a core node, each channel is divided into time slots and the stream of data is distributed among these time slots in several channels. However, to ease...	06/19/2007
7231006	Receiver and method for generating a control signal A receiver includes an amplifier which is responsive to a control signal to amplify an input signal and which outputs a corresponding amplified signal, a demodulator which demodulates the amplified signal to generate first and second components, a converter which ge...	06/12/2007
7224755	Method and apparatus for generating a frequency control signal A receiver including a frequency converter which converts a frequency of a received signal according to a control signal to obtain a frequency-converted received signal, and an AFC (automatic frequency controller) which converts the frequency-converted received sign...	05/29/2007
7224400	Sharp-tuned filter-combiner for combining adjacent TV channels A filter-combiner for combining television signals from adjacent channels is presented herein. The combiner has two inputs that respectively receive an NTSC combined visual and aural signal and a DTV signal wherein the NTSC signal and the DTV signal are in adjacent ...	05/29/2007
7224749	Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnet...	05/29/2007
7221412	Digital broadcasting receiver and channel information registration processing method in digital broadcasting receiver Disclosed in a digital broadcasting receiver comprising first means for performing pre-scan processing for successively tuning in on channels previously set, to examine whether or not a received signal on each of the channels is of a predetermined quality or more, a...	05/22/2007
7218359	Digital television receiver and method of recovering incoming digital television signal A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted sig...	05/15/2007
7215931	Method and apparatus for up-and-down-conversion of radio frequency (RF) signals This patent describes a method and system which overcomes the LO-leakage problem during modulation and demodulation, common to direct conversion and similar RF transmitters and receivers. This problem is solved using a virtual local oscillator (VLO™) signal which ...	05/08/2007
7203457	Tuning system for achieving rapid signal acquisition for a digital satellite receiver A method and apparatus for compensating for frequency drift in an LNB by storing the frequency offset of each LNB with respect to each channel. When a channel is selected, a particular LNB is activated and the table of offset values is consulted. The offset value fo...	04/10/2007
7199664	Integrated switchless programmable attenuator and low noise amplifier An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circu...	04/03/2007
7177341	Ultra wide bandwidth noise cancellation mechanism and method A mechanism and method are provided for self-canceling noise generated in a UWB receiver and for providing multi-mode operation for the receiver. Noise is canceled by generating a first set of wavelets in a same phase as an incoming signal, and a second set of wavel...	02/13/2007
7173899	Training and synchronization sequences for wireless systems with multiple transmit and receive antennas used in CDMA or TDMA systems Orthogonal sequences can be developed and used for use training and synchronizing in CDMA and TDMA systems. In particular, once a sequence is developed that has the length of the product of the channel length and the number of transmit antennas, the sequence is offs...	02/06/2007
7173987	Analog front end circuit The present invention relates to an analog front end circuit which is preferably used for taking out an image signal from a charge coupled device, that is used as image pickup means in an electronic camera such as an electronic still camera, a video camera and the l...	02/06/2007
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 frequency (IF) signal while reducing the power consumption and the cos...	01/30/2007
7164895	Antenna tuned circuit for a superheterodyne receiver A multi-band receiver in which characteristics including a tracking error are improved is provided with a variable frequency oscillator circuit, a variable divider circuit (39) for dividing an oscillation signal (SVCO) of the variable frequency oscillator cir...	01/16/2007
7149260	Carrier recovery apparatus of VSB receiver and a method of recovering carrier using the same A carrier recovery apparatus includes a first LPF calculating a carrier changing in accordance with a frequency offset, by using a pilot tone included in an I-signal of a VSB broadcasting signal, a limiter limiting a size of the carrier calculated by the first LPF a...	12/12/2006
7142587	Received path timing detecting circuit at DS-CDMA system A received path timing detecting circuit in a receiver used in a DS-CDMA system, which can detect received path timing in multi path propagation channels even under surroundings in which noise and interference electric power are very large, is provided. A received p...	11/28/2006
7136113	Digital television receiver and method of controlling antenna of the same Disclosed is an antenna controller of a digital television receiver and a controlling method thereof including an antenna receiving channel signals of digital television broadcasting and having a directionality dependent on a control signal, a signal processing part...	11/14/2006
7133470	Receiver with offset compensation Receiver for receiving a received signal with a carrier frequency loop (18) which generates a carrier frequency deviation detection signal (TF) for detecting a carrier frequency of the received signal in a first carrier frequency capture range; a carrier phas...	11/07/2006
7130576	Signal selector and combiner for broadband content distribution In a satellite receiving system, program channels are selected from one or more broadband signals and combined with other selected channels and transmitted from a first unit, for example an outdoor unit, to a second unit, for example a gateway, server, or set-top bo...	10/31/2006
7123309	Television tuner suitable for demodulation of both analog signals and digital signals There are provided a mixer for subjecting entered digital television signals or analog television signals to frequency conversion into an intermediate frequency band and an intermediate frequency tuning circuit so configured as to enable tuning frequency to be switc...	10/17/2006
7123310	Digital/analog television signal receiver using analog signal channel fine-tuning data for setting digital signal channels A digital/analog television signal receiver includes a tuner which receives television signals in an ATSC system and an NTSC system. An analog television signal in the NTSC system is received by an automatic frequency tuning (AFT) at a time of an automatic pre-setti...	10/17/2006
7106388	Digital IF demodulator for video applications An integrated communications system. A substrate having a receiver disposed on the substrate for converting a received signal to an IF signal, a digital IF demodulator disposed on the substrate and coupled to the receiver for converting the IF signal to a demodulate...	09/12/2006
7098967	Receiving apparatus Frequency conversion into a first intermediate frequency which is higher than a received frequency band is performed for a received signal by using a mixer and a PLL. Next, an output of the mixer is frequency converted into a second intermediate frequency of a base ...	08/29/2006

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Class 348/735 - Automatic frequency control