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| Number | Title | Issue Date |
| 7433417 | Receiver with a signal path The invention relates to a receiver (1, 49, 51, 52, 54) for receiving RF signals. The known receiver comprises a phase-locked loop which is controlled by the stereo pilot. Because of unwanted frequency changes, a sampling rate converter precedes the stereo de... | 10/07/2008 |
| 7349354 | Serving soft handoffs between mobile switching centers that use different protocols The present invention may relate to the following steps. Converting a bundle of data from a first format of a first mobile switching center to a second format of a switch. Routing, at the switch, the bundle data in the second format. Converting the bundle of data fr... | 03/25/2008 |
| 7330513 | Apparatus of transmitter and receiver for MIMO MC-CDMA system The invention relates to an apparatus of transmitter and receiver for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems. At the transmitter, modified orthogonal transmit diversity (MOTD) encoders are used for increasing... | 02/12/2008 |
| 7272197 | Device for recovering carrier Device for recovering a carrier including a first signal converter for multiplying a complex carrier caused by a phase error to a digitized passband VSB signal, to provide a baseband VSB signal, a second signal converter for multiplying a complex value of a frequenc... | 09/18/2007 |
| 7231002 | Apparatus for recovering carrier An apparatus and method of detecting whether the carrier frequency is locked for confirming recovering carrier is normally performed is disclosed. The apparatus includes a lock detector for judging whether the carrier frequency is locked by extracting DC value form ... | 06/12/2007 |
| 7177609 | Chopper-direct-conversion (CDC) radio architecture A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband signal in a single mixing step. The phase-alternating mixer may be impleme... | 02/13/2007 |
| 7061977 | Apparatus and method for using adaptive algorithms to exploit sparsity in target weight vectors in an adaptive channel equalizer An apparatus and method is disclosed for using adaptive algorithms to exploit sparsity in target weight vectors in an adaptive channel equalizer. An adaptive algorithm comprises a selected value of a prior and a selected value of a cost function. The present inventi... | 06/13/2006 |
| 7034893 | Method and apparatus for reception of terrestrial digital television signals A digital television signal is intercepted by a plurality of antennas to produce a corresponding plurality of input signals. The antennas have different directionality so they can be combined in a way that reduces multipath echoes. In one embodiment, the antennas ar... | 04/25/2006 |
| 7010269 | Pre-equalizer structure based on PN511 sequence for terrestrial DTV reception A free-running sample rate converter and a large spanning, non-linear pre-equalizer are employed before a timing recovery loop within a wireless receiver chain, while forward and feedback equalization after the timing recovery loop (at and around the input of a sync... | 03/07/2006 |
| 6950481 | Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before A vestigial-sideband (VSB) signal is converted to a double-sideband amplitude-modulation signal having information that is subsequently detected in the double-sideband amplitude-modulation signal. A method for performing the conversion includes mixing the VSB signal... | 09/27/2005 |
| 6914945 | Clock recovery circuit In a clock recovery circuit for DTV using a VSB modulation method, if the frequency of the symbol clock is fs, since the frequency difference between the fs/2 component signal of the VSB signal and the pilot signal is constant at fs/2, it is possible accurately to d... | 07/05/2005 |
| 6891898 | System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM modulated signal representing a series of OFDM symbols, and providing a recei... | 05/10/2005 |
| 6539063 | System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM modulated signal representing a series of OFDM symbols, and provid... | 03/25/2003 |
| 6418164 | Adaptive equalizer with enhanced error quantization An adaptive equalizer for use in blind equalization systems to compensate for transmission channel distortion and noise in a digital communication system uses multiple quantization levels for implementation of the Constant Modulus Algorithm (CMA). Differe... | 07/09/2002 |
| 6351293 | Decision directed phase detector A decision directed phase detector that uses the quantized data output from a slicer to aid the phase error detection process to determine a phase error of a complex signal such as a vestigial sideband (VSB) signal containing in phase (I) and quadrature p... | 02/26/2002 |
| 6154505 | Broadcast receiving apparatus A broadcast receiving apparatus provides multifunctionality to cope with analog modulated input signals as well as digital input signals modulated by various types of modulation schemes. The apparatus comprises a detector for detecting the modulation sche... | 11/28/2000 |
| 5875389 | SSB radio receiver An SSB radio receiver having an inexpensive wide-band IF filter which passes through not only a reception objective SSB station IF signal but also an interference SSB station IF signal simultaneously. These signals are SSB-detected to reproduce the origin... | 02/23/1999 |
| 5841814 | Sampling system for radio frequency receiver A radio frequency (rf) receiver adapted to receive a number of different digitally modulated rf input signals such as quadrature amplitude modulated (QAM) and vestigial side band (VSB) rf input signals includes circuitry for down converting the rf input s... | 11/24/1998 |
| 5835532 | Blind equalizer for a vestigial sideband signal A television signal receiver for processing an HDTV signal transmitted in a vestigial sideband (VSB) format with a one dimensional data constellation includes a first carrier recovery network (18), an equalizer (20), and a second carrier recovery network ... | 11/10/1998 |
| 5805242 | Carrier independent timing recovery system for a vestigial sideband modulated signal A television signal receiver for processing an HDTV signal transmitted in a vestigial sideband (VSB) format includes input complex filters shared by a timing recovery network (30) and a carrier recovery network (50). The filter network includes a pair of ... | 09/08/1998 |
| 5802461 | Apparatus and method for timing recovery in vestigial sibeband modulation Apparatus and method (10) for recovering timing information from a vestigial sideband (VSB) modulated signal generate a left hand component signal and a right hand component signal from the received signal, and filters B1 (f) and Br ... | 09/01/1998 |
| 5757861 | Apparatus for correcting phase error of VSB signal An error detecting and correcting apparatus incorporated in a trellis decoder to compensate effects of 180° phase errors of a transmitted N-level VSB (Vestigial Sideband) signal in a GA (Grand Alliance) HDTV (High Definition Television) receiver, the tra... | 05/26/1998 |
| 5699011 | DC offset compensation method and apparatus A DC offset measurement and compensation circuit includes a switch arrangement for establishing a zero carrier condition in the circuit. The circuit output is integrated to develop any DC offsets, which are converted to analog form and subtracted from the... | 12/16/1997 |
| 5675283 | Pilot recovery and polarity detection system A polarity detection circuit for an FPLL demodulated signal including a small DC pilot recovers the DC pilot by determining the DC levels of the demodulated output signals both with and without the DC pilot. A zero carrier condition is created for determi... | 10/07/1997 |
| 5675284 | Frequency lock indicator for FPLL demodulated signal having a pilot A biphase stable FPLL includes a polarity determination circuit that ascertains the lockup phase of the FPLL based upon the polarity of the pilot in the digital signal. A frequency lock indicator circuit determines from the recovered pilot when frequency ... | 10/07/1997 |
| 5673293 | Method and apparatus for demodulating QAM and VSB signals Method and apparatus for providing a QAM, a VSB, and a joint QAM/VSB demodulator are described. The describe demodulators are designed to minimize the amount of duplicated circuitry required to implement a joint QAM/VSB demodulator capable of performing t... | 09/30/1997 |
| 5668498 | Controlling FPLL polarity using pilot signal and polarity inverter A biphase stable FPLL includes a polarity determination circuit that ascertains the lockup phase of the FPLL based upon the polarity of the pilot in the digital signal. A frequency lock circuit also determines from the recovered pilot when frequency lock ... | 09/16/1997 |
| 5479137 | Controlled oscillator, as for synchyronous video detector An oscillator, constructed partially within the confines of a monolithic integrated circuit, includes a differential-input, differential-output, differential amplifier within the monolithic integrated circuit. First and second resistive potential dividers... | 12/26/1995 |
| 5168215 | Instantaneous frequency measurement apparatus and method An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite signal, filtering the squared signal for separating a first pas... | 12/01/1992 |
| 4370676 | Carrier regenerating circuit for a synchronous detector A synchronous detector for detecting an information signal modulated onto a carrier, such as a video IF signal, is disclosed in which there are provided a circuit for supplying the modulated information signal in the form of a vestigial sideband signal, a... | 01/25/1983 |
| 4312064 | Modified vestigial side band transmission system A communication transmission system includes one or more modulated carrier communication channels in which a receiver has a modified vestigial side band filter for eliminating phase cancellation. Accurate design of the modified vestigial side band filters... | 01/19/1982 |
| 4292594 | Method and apparatus for carrier regeneration and synchronous amplitude demodulation The invention relates to a method of regenerating the modulation carrier wave of an original modulated signal (SL) which has symmetrical frequency components about the carrier. A phase discriminator (D1) which receives two image signals (SL, S11) of the o... | 09/29/1981 |
| 4234963 | Synchronous detector particularly adapted for a video IF signal A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial sideband signal. A band-pass filter including a tuned circuit tuned to the frequenc... | 11/18/1980 |
| 4195314 | Tuning circuit for high frequency receiving apparatus with residual sideband modulation, especially for television receivers A tuning circuit for tuning a high frequency receiving apparatus with residual sideband modulation, especially a television receiver, with a counter for forming encoded values of tuning voltage, with a store for the digital storing of the encoded values o... | 03/25/1980 |
| 4050024 | Sideband detector A sideband detector capable of detecting one of two mixing products and disregarding the other is provided. The characteristic of the invention is provided by feeding a sequential logic mixer in each of two channels by the output of a reference source whi... | 09/20/1977 |
| 4048572 | Adaptive correction of phase errors in noncoherent demodulation of carrier asymmetrically modulated with digital signals Digital signals asymmetrically modulated upon a carrier, with suppressed or vestigial second sideband, are recovered at a receiver by pseudo-coherent demodulation or periodic sampling and subsequent digitization to provide a train of raw data signals X fr... | 09/13/1977 |
| 3988775 | Ghost signal suppressing device for television receiver set A ghost signal suppressing device comprises a circuit for suppressing the luminance signal of a ghost signal and a circuit for suppressing the color signal of the ghost signal. A delayed signal used for suppressing the ghost signal is produced at a single... | 10/26/1976 |
| 3961135 | Synchronized demodulation system A demodulation system for use in a vestigial sideband system of an over-modulation type including a sampler for sampling a reduced carrier frequency component from a received modulated wave to be used for demodulation. A discriminator is operative to dete... | 06/01/1976 |
