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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 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 step for processing in the digital domain. A wavelet de-noising opera... | 12/04/2007 |
| 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 8 VSB digital ATV standard. The novel ECR training signal is also sui... | 10/04/2005 |
| 6947060 | Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance... | 09/20/2005 |
| 6937292 | Ghost cancellation reference signal with bessel chirps and PN sequences, and TV receiver using such signal Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same VBLI in each successive field facilitates the more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing bas... | 08/30/2005 |
| 6907095 | Clock ride-over method and circuit A clock ride-over circuit in which clock ride-over may be achieved even if jitter is contained in clocks prior to and subsequent to ride-over and no control input signal for write and readout is applied from outside. A clock prior to rideover CLK—1 | 06/14/2005 |
| 6904107 | Space-weighted communication path estimation A method of estimating a communication path formed of a plurality of channels, the method necessitating an estimate of the impulse response C1, C2, . . . , Cn of the channels, including the following steps of (1) acquiring a space st... | 06/07/2005 |
| 6894728 | Method for equalizing a VSB high definition television signal in the presence of co-channel interference A method and apparatus for equalizing a signal containing high definition television information in the presence of co-channel NTSC interference employs an equalizer having feed forward and decision feedback filters. A comb filter is inserted ahead of the equalizer ... | 05/17/2005 |
| 6873371 | Ghost cancellation reference signal with bessel chirps and PN sequences, and TV receiver using such signal Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of ... | 03/29/2005 |
| 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 training signal in each data field includes a prescribed number of cycle... | 11/09/2004 |
| 6806915 | Method and apparatus for echo cancellation in digital communications 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 8 VSB digital ATV standard. The novel ECR training signal is also sui... | 10/19/2004 |
| 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 of a repetitive-PN1023 sequence with baud-rate symbols, which repetiti... | 07/27/2004 |
| 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 filter length is adjusted so as to reduce the amount of filtering across ... | 04/06/2004 |
| 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 threshold is determined in a threshold estimator. The interference i... | 03/23/2004 |
| 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 of the display components. The display system can include a display ... | 03/23/2004 |
| 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 synchronization segment of a data field having a plurality of seg... | 05/06/2003 |
| 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 suppressed using a surface-acoustic-wave (SAW) filter in th... | 06/04/2002 |
| 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 coefficients of its component filters. The channel equalizer r... | 04/23/2002 |
| 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 first plurality of coefficients to a first predetermined valu... | 07/31/2001 |
| 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 best image quality. For this purpose, the five vertical con... | 07/17/2001 |
| 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 corresponding to approximately a television color subcarrier fcs, and ... | 06/12/2001 |
| 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 until the next time the same channel is tuned to. The stored... | 04/24/2001 |
| 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 path induced distortion.... | 10/17/2000 |
| 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. A first block of I data is captured and a first block of ... | 03/23/1999 |
| 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 estimated channel impulse response, over an entire frequency ... | 06/02/1998 |
| 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 television signal component, a co-channel interference component, a... | 04/28/1998 |
| 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 frequency which is the same as that used in generating a referen... | 04/08/1997 |
| 5568202 | System for echo cancellation comprising an improved ghost cancellation reference signal A system for improved echo cancellation for use in particular in television receivers. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwi... | 10/22/1996 |
| 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 filter coefficient of a far ghost image, after distinguishing... | 06/25/1996 |
| 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 sequence. The channel equalizer for a HDTV includes, a com... | 12/12/1995 |
| 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 repetitive horizontal data segments each including a fixed... | 08/01/1995 |
| 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 reference (GCR) signal during the vertical blanking interval ... | 11/01/1994 |
| 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 alternatively passing the television signal or an output of a f... | 10/04/1994 |
| 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 plurality of predetermined symbols and has a time duration... | 11/09/1993 |
| 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 added during transmitting is changed to a white noise so as... | 02/16/1993 |
| 5179444 | System for echo cancellation comprising an improved ghost cancellation reference signal A television receiver comprising a system for improved echo cancellation. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary... | 01/12/1993 |
| 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 filter before being combined with a conventional vestigial si... | 01/05/1993 |
| 5121211 | System for echo cancellation comprising an improved ghost cancellation reference signal A system for improved echo cancellation for use in particular in television receivers. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwi... | 06/09/1992 |
| 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 between the lines) to process the received signal on a line... | 06/02/1992 |
| 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 sequence of derived signal samples. The tap-weight coefficient ... | 05/26/1992 |
| 5111298 | Method and apparatus for communication channel identification and signal restoration A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR (Ghost Cancellation Reference) signal, is further processed to effect a transfer of energy from ... | 05/05/1992 |
