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7567724 |
Image processing apparatus, image processing method, program of image processing method, and recording medium in which program of image processing method has been recorded
The present invention is applied, for example, to resolution conversion. An edge gradient direction v 1 with the largest gradient of pixel values and an edge direction v 2 orthogonal to the edge...
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7304687 |
Ghost cancellation system using wavelet processed ghost cancellation reference signal
Disclosed is a ghost cancellation system based on an enhanced ghost cancellation reference signal for noisy environments. The received analog television signal is first subjected to a digitization...
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6952238 |
Method and apparatus for echo cancellation in digital ATV systems using an echo cancellation reference signal
A novel echo cancellation reference (“ECR”) training signal is inserted into the current ATSC 8 VSB data stream to achieve improved echo rejection while maintaining compatibility with the ATSC...
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6816204 |
Ghost cancellation reference signals for broadcast digital television signal receivers and receivers for utilizing them
Broadcast DTV signals are improved by including in each of their successive data fields a training signal for the adaptive channel-equalization and echo-cancellation filtering in receivers. The...
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6768517 |
Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
DTV signals transmitted over the air with a symbol rate of around 10.76 million samples per second include echo-cancellation reference (ECR) signals each of which includes or essentially consists...
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6717621 |
Method and apparatus for reducing flicker in a video image sequence
Briefly, in accordance with one embodiment of the invention, a method of reducing flicker in a video image sequence includes the following. Successive video images are temporally filtered. The...
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6710811 |
Data processing device
The invention relates to a data processing device for recovering digital data which is received in an analogue transmitted signal. According to the invention, the received signal is digitized and a...
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6710819 |
Method and system for improved display filtering
A method and a system for improved filtering of display data is disclosed herein. A display system may be used to separately filter display components of the display data based on frequency content...
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6559894 |
Block-adaptive equalization using partial decision feedback in digital broadcast communications
A block-adaptive method of performing equalization on a signal received over a broadcast system, includes providing a set of predetermined symbols that correspond to symbols in a data field...
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6400393 |
DTV receiver with filter in I-F circuitry to suppress FM sound carrier of NTSC Co-channel interfering signal
The frequency-modulated sound carrier of any co-channel interfering NTSC television signal that accompanies multiple-level symbols in a digital receiver, such as a digital television receiver, is...
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6377312 |
Adaptive fractionally spaced equalizer for received radio transmissions with digital content, such as DTV signals
In a radio receiver for digital transmissions, an adaptive channel equalizer is clocked at a sampling rate higher than symbol rate by a factor k and employs decision feedback for adjusting the...
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6268888 |
Mechanism for adaptive selection of anti-ghosting filtering
A mechanism for adaptive selection of anti-ghosting filtering accesses a first plurality of coefficients being used by the anti-ghosting filtering and compares a first set of one or more of the...
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6262766 |
Method for assessing the quality of a television image
A method assesses the quality of a television image. In diversity reception installations including several receivers, it is necessary to establish a criterion for selecting the receiver with the...
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6246431 |
Digital television system for reducing co-channel interference in 8 MHZ channels
A linear filter for use in 8 MHZ television broadcast systems is provided having a frequency response which includes a notch corresponding to a television picture carrier fpix, a notch...
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6222592 |
TV receiver equalizer storing channel characterizations for each TV channel between times of reception therefrom
An adaptive channel equalizer for a digital television receiver includes memory for storing channel characterization information for each received channel, from each time the channel is tuned to...
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6133963 |
System for echo cancellation comprising an improved ghost cancellation reference signal
An apparatus for receiving a television signal containing a ghost cancellation reference signal, and for using the reference signal to process the television signal so as to substantially eliminate...
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5886749 |
Demodulation using a time domain guard interval with an overlapped transform
A system and method for demodulation of an RF signal on a transmission channel is provided. The RF signal is demodulated to baseband as an in-phase (I) data signal and a quadrature (Q) data signal....
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5761088 |
Method and apparatus for channel identification using incomplete or noisy information
A method and apparatus for channel identification utilizing two Least-Squares (LS) estimators. Each LS estimator is used for calculating a sequence of channel values, further for determining an...
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5745187 |
Method and apparatus for combating co-channel NTSC interference for digital TV transmission using a bank of rejection filters
A television receiver for reducing a co-channel interference in a digital television signal transmitted by a transmitter, wherein the digital television signal includes an encoded digital...
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5619278 |
Method and apparatus for processing a ghost cancellation reference signal
In a ghost cancellation system, it is necessary to synchronize the system to the ghost cancellation reference (GCR) signal contained in the video signal. A free-running oscillation, having a...
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5530485 |
Channel equalizer for a high definition television
A channel equalizer for a high definition television that enhances the convergent speed of the channel equalizer by renewing first a filter coefficient of a near ghost image and then renewing a...
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5475444 |
Channel equalizer for a HDTV using a composite filter
A channel equalization system of a VSB transmission system for a HDTV which can correct phase errors by using composite filters as well as by using general data even in a period having no training...
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5438369 |
Digital data interleaving system with improved error correctability for vertically correlated interference
A digital data transmission system for signals in the areas of interference having a high degree of vertical correlation comprises a transmission frame including a plurality of vertically arranged...
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5396299 |
System and circuit architecture for echo cancellation and a television receiver comprising same
A circuit architecture suitable for use in a television receiver which effectively performs a ghost or echo cancellation procedure on post echo components and pre echo components occurring within...
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5361102 |
System to cancel ghosts in NTSC television transmission
A new technique for channel characterization for Advanced Compatible TV (ACTV) broadcasting systems is hereby proposed that conforms to the current practice of transmitting a ghost cancellation...
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5353069 |
Transmitted television signal waveform equalizing system
A waveform equalizing system includes a clock reproducing phase locked loop circuit for reproducing a clock signal from a television signal; a transversal filter; a first selector circuit for...
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5260972 |
Technique for determining signal dispersion characteristics in communications systems
The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting a training sequence. This training sequence includes a...
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5187577 |
Circuit for eliminating ghost noise in image processing system
A circuit for eliminating a ghost noise of an image processing system in transmitting an image signal, wherein an image data and a noise are separated from each other visually and the ghost noise...
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5177611 |
Method and apparatus for canceling quadrature distortion as for video signals having in-phase and quadrature phase components
High definition or enhanced television signals include supplementary information which is double-sideband modulated in quadrature with the picture carrier, and passed through an inverse Nyquist...
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5119196 |
Ghost cancellation of analog TV signals
Ghosts are canceled in received analog TV (for IDTV, EDTV, and HDTV) signals by utilizing the fact that there are short periods of time without the analog signals (the horizontal flyback interval...
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5117291 |
Technique for adjusting signal dispersion cancellation apparatus in communications systems
A technique for generating the tap-weight coefficients for a signal dispersion cancelling filter utilizes circuitry which is responsive to received signal samples and generates a time-ordered...
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5065242 |
Deghosting apparatus using pseudorandom sequences
Deghosting apparatus for eliminating multipath signal components in a received transmitted television signal incorporates a training signal which is a finite duration sequence of repetitions of a 2...
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5065241 |
Ghost cancelling system that cancels ghosts from video signals with a transversal filter
A ghost cancelling system which distinguishes whether ghosts have been substantially cancelled from a video signal for finding an equilibrium condition. The system calculates a specified value...
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5060067 |
System for negating the effects of DC offsets in an adaptive equalizer
An adaptive filter for equalizing a received information signal is controlled by an error signal generated in response to a reference signal alternately transmitted in inverted and non-inverted...
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4980767 |
Technique for determining signal dispersion characteristics in communications systems
The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting training sequences. More specifically, each sequence...
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4941049 |
Television system using reversing scan which minimizes ghost visibility
A transmission system for minimizing the visibility of ghost images develops a transmission signal having groups of video information alternately reversed at the group rate. The resultant signal...
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4887306 |
Adaptive temporal filter for ultrasound imaging system
An improved temporal compounding technique for a medical ultrasound imaging system. The imaging system produces a plurality of pixel signals, such that each pixel signal comprises a time series of...
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4703357 |
Adaptive television deghosting system
An adaptive television deghosting system operates on modulated video signals including a direct signal component and one or more ghost signal components. The system uses synchronously demodulated...
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4449145 |
Intelligent teletext decoder
An equalizer and decoder system compensating for multipath distortion in digital format signals sent by teletext, for example. The system loads demodulated data signals and a received reference...
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4424533 |
Phase distortion detection circuitry for low cost automatic equalizer
A system for detecting phase distortion in video signals due to multipath effects includes circuitry for extracting the high and low frequency content of a horizontal synchronization signal, and...
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4393397 |
Television ghost signal detector with color burst phase delay control
A television ghost signal detector system is provided which includes a variable delay line for delaying training signal components of the main video signal. The training signal includes burst...
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4297660 |
Electric circuit using surface acoustic wave device
A surface acoustic wave device comprises an input and output transducers. A signal is supplied from a signal input circuit to the input transducer and a surface wave corresponding to the input...
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4152657 |
Echo suppression circuit
A completely automatic suppression of an echo in a video signal is accomplished by using a multiplying circuit in the amplitude and polarity control of a correction signal which must compensate for...
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4091418 |
Automatic channel equalization with time base expansion
An automatic channel equalization system for use with a television receiver includes a control section for automatically operating a transversal equalizer according to the distortion exhibited by a...
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3996419 |
Technique for minimizing multi-path distortion effects in video transmission
A reference signal reflecting distortion characteristics caused by surrounding interference conditions is applied to transmitted television video or quasi-video information to effectively cancel...
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3482168 |
DEVICE FOR REMOVAL OF INTERFERING SIGNALS
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3290607 |
Echo-type equalizer which differentiates echo signals
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