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| Number | Title | Issue Date |
| 7349470 | Decision feedback equalizers with constrained feedback taps for reduced error propagation Constrained feedback tap weights of a decision feedback equalizer are determined by iteratively solving a non-linear equation for a constraint multiplier. The non-linear equation is based on a 2-norm of feedback tap weights constrained by an explicit constraint cons... | 03/25/2008 |
| 7327810 | Efficient conjugate gradient based channel estimator In forming a channel estimate, a received signal y is decoded to form data s, a convolution matrix Ŝ is formed from the data s, a matrix F is formed from the data s such that the matrix F results from the forming of the matrix Ŝ as a convolution matrix, and a conj... | 02/05/2008 |
| 7327790 | MPEG on screen display coder for DTV interfaces An MPEG on-screen display coder includes a buffer, an MPEG encoder, and a multiplexer. The buffer receives and buffers an MPEG transport data stream containing frames of a selected program and frames of a non-selected program. The MPEG encoder encodes frames of the ... | 02/05/2008 |
| 7324591 | Adaptive equalizer A channel impulse response is determined from a cross-correlation of a received training sequence and a stored version of the transmitted training sequence. The channel impulse response is iteratively cleansed of noise caused by the finiteness of the cross-correlati... | 01/29/2008 |
| 7313208 | Pre-equalization for low-cost DTV translators A low cost DTV translator, which translates an incoming signal on channel A to an outgoing signal on channel B, includes a transmitter pre-equalizer whose taps are configured with tap values that pre-distort a signal so as to negate distortion caused by a high power... | 12/25/2007 |
| 7313182 | Decision feedback equalizers with constrained feedback taps for reduced error propagation Constrained tap weights of a decision feedback equalizer are determined according to the channel impulse response of a channel and a constraint function. The constraint function is differentiable and is an approximation of a non-differentiable tap weight constraint ... | 12/25/2007 |
| 7310505 | Attenuation control for tuners A tuner includes an RF input with a signal level controller such as an attenuator that is provided to attenuate a signal from the RF input. A tunable RF filter provides RF band limiting and determines simultaneously the AGC bandwidth. An amplifier with resistive fee... | 12/18/2007 |
| 7310354 | Synchronous data link signal generator A synchronous data link signal is generated for supply between digital television equipment in a studio and an RF transmitter. The synchronous data link signal includes first data to be encoded at a first data rate, second data to be encoded at a second data rate le... | 12/18/2007 |
| 7305026 | Multipath ghost eliminating equalizer with optimum noise enhancement An equalizer for processing blocks of data includes n−1 data shifters, n finite filters, an adder, and a controller. Each of the n−1 data shifters shifts the blocks of data. One of the n finite filters applies a corresponding set of finite filter coefficients to... | 12/04/2007 |
| 7289580 | Channel estimator using one or more correlation reference vectors to eliminate data related noise An impulse response of a channel is estimated by correlating a received signal with a stored vector. The received signal contains a training sequence having a length Ltr, the stored vector has a length Lsv, Ltr/n=Lsv, and ... | 10/30/2007 |
| 7277505 | Mapping arrangement for digital communication system A receiver receives a digital signal. The digital signal contains a frame of robust VSB data and ATSC data, and the digital signal further contains a map. The map contains information indicating a location of the robust VSB data and ATSC data in the frame. A decoder... | 10/02/2007 |
| 7239679 | Adaptive thresholding algorithm for the noise due to unknown symbols in correlation based channel impulse response (CIR) estimate An impulse response is estimated for a channel by estimating an intermediate impulse response of the channel. The intermediate impulse response comprises at least one multipath spike and one or more non-deterministic noise components at locations throughout the chan... | 07/03/2007 |
| 7215714 | Robust digital communication system Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data an... | 05/08/2007 |
| 7203257 | Best linear unbiased channel estimation for frequency selective multipath channels with long delay spreads A channel impulse response for a channel is determined by determining an initial channel impulse response estimate based upon a stored training sequence and a received signal, by thresholding the initial channel impulse response estimate, by estimating a noise varia... | 04/10/2007 |
| 7190720 | Tap weight initializer for an adaptive equalizer Initial values of the tap weights for the taps of a linear equalizer are determined based on a channel impulse response of a channel so that the values corresponding to the weights of the equalizer taps achieve optimum initialization of the equalizer. These values a... | 03/13/2007 |
| 7187698 | Robust digital communication system Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data an... | 03/06/2007 |
| 7177343 | Compound chirp and synchronizer for using same A compound chirp is provided in a received signal to permit a receiver to synchronize to the received signal. The compound chirp has temporally overlapping up frequency and down frequency components. ... | 02/13/2007 |
| 7177354 | Method and apparatus for the control of a decision feedback equalizer The tap weights of an equalizer are initialized in response to a received relatively short training sequence, and new tap weights for the equalizer are thereafter successively calculated in response to relatively long sequences of received symbols and corresponding ... | 02/13/2007 |
| 7110447 | Channel estimator for an adaptive equalizer An impulse response of a channel is estimated by cross-correlating a known training signal with a received training signal to produce a cross-correlation vector. The cross-correlation vector is characterized by a known noise component resulting from the finiteness o... | 09/19/2006 |
| 7072636 | Printed circuit doubly balanced mixer for upconverter A doubly balanced upconverter mixer includes a local oscillator balun circuit comprising juxtaposed foil elements on opposite sides of an insulated substrate with electrical interconnections between the foil elements. An IF balun circuit also comprises series tuned ... | 07/04/2006 |
| 7035353 | Channel estimation method blending correlation and least-squares based approaches A response of a channel may be estimated by correlating a received signal and a training sequence, by forming a matrix Γ based on a desired shape for the peaks of the correlation, by extracting a vector y from the received signal, and by estimating the channel resp... | 04/25/2006 |
| 7028330 | Transferring information between an internet module and TV controller of a web TV A web television includes a display, a tuner, an internet module, and a PIP module. The tuner is arranged to select television video for display on the display and to select television audio for display by a speaker of the web television. The internet module is arra... | 04/11/2006 |
| 6996133 | Digital communication system for transmitting and receiving robustly encoded data Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data, The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data an... | 02/07/2006 |
| 6986080 | Timing error detector for digital signal receiver A received signal having a series of T-spaced symbols having more than two levels is sampled at a rate that produces successive samples SP, SC, and SN substantially equally spaced by T/2. An output representing the difference between... | 01/10/2006 |
| 6985092 | Robust system for transmitting and receiving map data Frames comprise odd fields and even fields. The frame sync segments of the odd fields contains a current map specifying the location of data in frames, a next map specifying the location of data in a future frame, and a frame count designating the future frame. The ... | 01/10/2006 |
| 6980255 | VSB modulator symbol clock processing to reduce jitter/phase noise and sampling artifacts A translator demodulates a received digital television signal so as to produce a digital data stream, a symbol clock, and a byte clock, wherein the symbol clock and the byte clock are corrupted by phase noise. The digital data stream is written into a buffer in resp... | 12/27/2005 |
| 6963618 | Enhanced slice prediction feedback In an enhanced slice prediction embodiment, an input containing first and second data is received. Each data element of the first data represents a number of bits that is greater than a number of bits represented by each data element of the second data, and the firs... | 11/08/2005 |
| 6958781 | Mapping arrangement for digital communication system A receiver receives a digital signal. The digital signal contains a frame of robust VSB data and ATSC data, and the digital signal further contains a map. The map contains information indicating a location of the robust VSB data and ATSC data in the frame. A decoder... | 10/25/2005 |
| 6947481 | Code enhanced equalization based upon a reliability factor A receiver includes an equalizer and a decoder which decodes data from a signal. The signal is based upon an output of the equalizer. The receiver also includes an encoder, which re-encodes the decoded data, and an error generator, which generates an error vector ba... | 09/20/2005 |
| 6937649 | Ghost eliminating equalizer An equalizer substantially eliminates a ghost of a received main signal by (i) applying coefficients b (where b may be equal to one) to the received main signal and the ghost in order to modulate the received main signal and the ghost so that the received main signa... | 08/30/2005 |
| 6927708 | Mapping system for transmission and reception of multiple data types A transmitter transmits successive data fields, and each data field includes a mix of VSB data segments and E-VSB data segments and interleaved portions of maps. The maps define the mixes of VSB data segments and E-VSB data segments in corresponding data fields to b... | 08/09/2005 |
| 6924753 | Robust system for transmitting and receiving map data Frames comprise odd fields and even fields. The frame sync segments of the odd fields contains a current map specifying the location of data in frames, a next map specifying the location of data in a future frame, and a frame count designating the future frame. The ... | 08/02/2005 |
| 6919930 | Digital television signal translator A tuner of a digital television signal translator tunes to receive an RF digital television signal on a first selected television channel. A demodulator provides a baseband digital television signal from the RF digital television signal to which the tuner is tuned. ... | 07/19/2005 |
| 6917655 | Coding and decoding a signal modified in accordance with the feedback states of an encoder A data encoding system includes a modifier, an encoder, and a feedback. The modifier receives a first data stream and modifies the first data stream so as to provide a second data stream. The encoder encodes the second data stream in order to provide an output. At l... | 07/12/2005 |
| 6904085 | Multipath ghost eliminating equalizer with optimum noise enhancement An equalizer includes n processing paths arranged to process blocks of data. N−1 data shifters are arranged so that each of the n−1 data shifters is in a corresponding one of the n processing paths and so that one of the n processing path has no data shifter. N ... | 06/07/2005 |
| 6806816 | Robust system for transmitting and receiving map data First and second data are formatted for transmission in successive alternating odd and even data fields. An odd field map data unit and an even field map data unit define the mix of data segments containing only first data and data segments containing only second da... | 10/19/2004 |
| 6798361 | E-VSB main stream packet jitter remediation A field transmitted by a transmitter and received by a receiver has a map indicating the number of E-VSB segments and VSB segments in the field. The E-VSB segments contain E-VSB data, and the VSB segments contain VSB data. The VSB data includes video and/or audio da... | 09/28/2004 |
| 6785906 | Polling internet module of web TV A web television includes a display, a tuner, an internet module, and a PIP module. The tuner is arranged to select television video for display on the display and to select television audio for display by a speaker of the web television. The internet module is arra... | 08/31/2004 |
| 6765508 | Robust system for transmitting and receiving map data A field contains a map, a number of E-VSB data segments, and a number of VSB data segments. The map indicates at least the number of E-VSB data segments in the field. The E-VSB data segments are located in the field such that the spacing between the E-VSB segments c... | 07/20/2004 |
| 6762698 | Robust system for transmitting and receiving map data Frames comprise odd fields and even fields. The frame sync segments of the odd fields contains a current map specifying the location of data in frames, a next map specifying the location of data in a future frame, and a frame count designating the future frame. The ... | 07/13/2004 |
