| Patent Number |
Title Of Patent |
Date Issued |
| RE38456 |
Decimation of baseband DTV signals prior to channel equalization in digital television signal re |
March 9, 2004 |
| A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol |
| 7038732 |
DTV signal with GCR components in plural-data-segment frame headers and receiver apparatus for s |
May 2, 2006 |
| A DTV signal has a plural-data-segment frame header including complementary first and second ghost-cancellation reference signals differentially delayed by the duration of two NTSC horizontal scan lines. A receiver for such DTV signal has an adaptive equalizer for baseband symbol cod |
| 6803970 |
Digital television receiver with match filter responsive to field synchronization code |
October 12, 2004 |
| A radio receiver for receiving a selected digital TV signal uses final intermediate frequency signals the carrier frequencies of which are multiples of symbol rate. The radio receiver has a match filter receptive of rectified samples of digitized intermediate-frequency signal and res |
| 6545728 |
Digital television receivers that digitize final I-F signals resulting from triple-conversion |
April 8, 2003 |
| Receiving apparatus for digital television signals digitizes a final intermediate frequency signal supplied from a triple-conversion radio receiver and synchrodynes the digitized final intermediate frequency signal to baseband. The triple-conversion radio receiver selects one of a pl |
| 6535553 |
Passband equalizers with filter coefficients calculated from modulated carrier signals |
March 18, 2003 |
| A digital communications radio receiver, as for television, digitizes a final intermediate-frequency signal offset from zero frequency no more than a few megahertz. This digitized final I-F signal is passed through an adaptive equalizer before being synchrodyned to baseband in the digita |
| 6526101 |
Receiver for QAM digital television signals |
February 25, 2003 |
| Apparatus for reproducing data from a selected digital television signal, transmitted in packet form as quadrature-amplitude-modulation (QAM) of a carrier, has a tuner for selecting a digital television signal and converting it to a final intermediate-frequency signal, which is digitized |
| 6512555 |
Radio receiver for vestigal-sideband amplitude-modulation digital television signals |
January 28, 2003 |
| Apparatus for reproducing data from a selected digital television signal, transmitted in packet form as vestigial-sideband (VSB) amplitude-modulation (AM) of a carrier, has a tuner for selecting a digital television signal and converting it to a final intermediate-frequency signal, w |
| 6426780 |
DTV receiver with low-band final I-F signal filtered for suppressing co-channel interfering NTSC |
July 30, 2002 |
| A digital television receiver converts very-high-frequency intermediate-frequency digital television signal to a band with uppermost frequency in the lower portion of the high-frequency range. This facilitates RLC analog filtering, such as a Butterworth-Thomson-transition filter or a |
| 6396542 |
TV receiver having kinescope with 16:9 aspect ratio screen and dot pitch for 480 lines per frame |
May 28, 2002 |
| A television receiver receives HDTV video signals and scan converts them to a lower line scanning rate with field-to-field interlace. This scan conversion is done to conserve the power consumption by the magnetic deflection system for the kinescope, which has a display screen with a |
| 6377312 |
Adaptive fractionally spaced equalizer for received radio transmissions with digital content, su |
April 23, 2002 |
| 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 response as supplied at the sa |
| 6313885 |
DTV receiver with baseband equalization filters for QAM signal and for VSB signal which employ c |
November 6, 2001 |
| During the reception of VSB DTV signal, the channel equalizer for a QAM/VSB DTV signal receiver the equalizer is operated to equalize only the real sample stream of VSB symbol code, rather than being operated as a complex equalizer. During the reception of QAM DTV signal, the real sample |
| 6313882 |
TV reception apparatus using same ghost-cancellation circuitry for receiving different types of |
November 6, 2001 |
| Television signal reception apparatus for receiving a television signal selected from among transmitted television signals of different types includes a respective receiver portion for each of the different types. Responsive to its respective type of television signal being received, |
| 6300984 |
Ghost-cancellation reference signals using spaced PN sequences |
October 9, 2001 |
| Training signal for channel equalization is located in the initial data segment of each DTV data field or in the nineteenth scan line of each NTSC field. The training signal comprises a pseudo-random noise sequence near the conclusion of the initial data segment of each DTV data field or |
| 6222592 |
TV receiver equalizer storing channel characterizations for each TV channel between times of rec |
April 24, 2001 |
| 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 information is retained even if |
| 6211924 |
Decimation of baseband DTV signal prior to channel equalization in digital television signal rec |
April 3, 2001 |
| A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol |
| 6184942 |
Adaptively receiving digital television signals transmitted in various formats |
February 6, 2001 |
| Methods for operating an adaptive receiver for receiving a selected DTV signal, which can be either a quadrature-amplitude-modulation (QAM) signal or a vestigial sideband (VSB) signal. The adaptive receiver includes adaptive symbol decoding circuitry for adaptively decoding baseband sign |
| 6137545 |
Reception mode control in radio receivers for receiving both VSB and QAM digital television sign |
October 24, 2000 |
| A radio receiver uses the same tuner for receiving a selected wideband digital signal of at least a few megahertz bandwidth, such as a digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal accompani |
| 6134373 |
System for recording and reproducing a wide bandwidth video signal via a narrow bandwidth medium |
October 17, 2000 |
| An encoder separates luminance and chrominance signal components of a composite video signal. The frame-to-frame changes in the luminance signal are detected, and a motion signal is derived therefrom. The higher frequency portion of the luminance signal is adaptively de-emphasized in |
| 6124898 |
Digital television receiver with equalization performed on digital intermediate-frequency signal |
September 26, 2000 |
| A digital television signal receiver in a television set or in a digital video recorder digitizes received digital television signal as converted in frequency to a final intermediate-frequency band close to baseband, then performs equalization filtering on the digitized signal before |
| 6118495 |
Training signal in plural PN sequences near beginnings of data segments of DTV signal or scan li |
September 12, 2000 |
| Training signal for channel equalization is located in the initial data segment of each DTV data field and in the nineteenth scan line of each NTSC field. Arranging for training signal separated from plural PN sequences near the beginnings of the initial data segments of DTV data fie |
| 5966188 |
Decimation of baseband DTV signals prior to channel equalization in digital television signal re |
October 12, 1999 |
| A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol |
| 5636252 |
Automatic gain control of radio receiver for receiving digital high-definition television signal |
June 3, 1997 |
| Digital HDTV signals are exemplary of vestigial sideband (VSB) signals, which signals include a pilot carrier and sidebands generated in response to symbol codes descriptive of digital signals. A radio receiver for such VSB signals includes automatic gain control (AGC) circuitry that gen |
| 5606579 |
Digital VSB detector with final IF carrier at submultiple of symbol rate, as for HDTV receiver |
February 25, 1997 |
| In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting |
| 5600380 |
Ghost-cancelation reference signal acquisition circuitry, as for TV receiver or video recorder |
February 4, 1997 |
| A first composite video signal may include attendant ghosts and sometimes includes in a prescribed L.sup.th line of each field during the vertical blanking interval one of a cycle of M ghost-canceling reference (GCR) signals of prescribed magnitude and respective phasing. Filter circuitr |
| 5548617 |
Digital VSB detector with bandpass phase tracker using rader filters, as for use in an HDTV rece |
August 20, 1996 |
| In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting |
| 5532755 |
Apparatus for suppressing ghosts in signals modulating a carrier in quadrature phasing with a vi |
July 2, 1996 |
| Composite video signal and a relatively low power phase-shift-keyed (PSK) signal encoding digital information are transmitted on respective phases of a video carrier in quadrature with each other. Selected scan lines of the composite video signal contain ghost-cancellation reference (GCR |
| 5506636 |
HDTV signal receiver with imaginary-sample-presence detector for QAM/VSB mode selection |
April 9, 1996 |
| A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The final IF signal from the tuner is digitized for application to in-phase and quadrature QAM |
| 5500739 |
Frequency-multiplexing FM luma signal with color and 2nd under signals having overlapping freque |
March 19, 1996 |
| A frequency-multiplexed video signal is generated in which a color-under signal and a second under signal are linearly combined with at least partially overlapping frequency spectra to form a composite under signal for an FM luma signal. The frequency-multiplexed video signal is suited |
| 5481316 |
System, apparatus and method for canceling televison ghost signals |
January 2, 1996 |
| A ghost canceling reference signal transmission and reception system utilizes a ghost canceling reference signal including a zero to seventy IRE step followed by a seventy to zero IRE (sin x)/x step. |
| 5479449 |
Digital VSB detector with bandpass phase tracker, as for inclusion in an HDTV receiver. |
December 26, 1995 |
| In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting |
| 5461426 |
Apparatus for processing modified NTSC television signals, with digital signals buried therewith |
October 24, 1995 |
| A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line fre |
| 5361102 |
System to cancel ghosts in NTSC television transmission |
November 1, 1994 |
| 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 (VBI). A copy of the GCR sign |
| 5341177 |
System to cancel ghosts generated by multipath transmission of television signals |
August 23, 1994 |
| A ghost-canceling reference signal for inclusion in a television signal is provided by cyclically inserting ones of extended-length complementary-sequence pairs into a prescribed scan line in each of the vertical blanking intervals of successive fields of the television signal. By de |
| 5331416 |
Methods for operating ghost-cancelation circuitry for TV receiver or video recorder |
July 19, 1994 |
| Ghosts accompanying composite video signals are suppressed using separate filters for suppressing macroghosts and microghosts, the filtering parameters of these filters being adjustable responsive to digital programming signals generated by a computer. Computation includes data acqui |
| 5196851 |
Linearizing non-linear analog-to-digital process and circuit |
March 23, 1993 |
| A circuit for linearizing analog-to-digital output is shown in FIG. 2, with an analog signal V.sub.i transmitted by input circuit 10 is applied to an input port of an analog-to-digital converter 12 controlled by a sampling signal V.sub.s, to provide digital data V.sub.d on an "N" bit dat |
| 5113262 |
Video signal recording system enabling limited bandwidth recording and playback |
May 12, 1992 |
| An improved video signal recording system for recording a full bandwidth video signal on a limited bandwidth medium is disclosed. The recording system includes an encoder, coupled to an input terminal, for adaptively processing a composite video signal in response to a motion representat |
| 5083197 |
Apparatus for restoring the correct phase relation of the chroma and luminance signals passed th |
January 21, 1992 |
| Apparatus is disclosed for processing the chroma and luminance signals reproduced from a magnetic recording medium. The chroma signal in passing through a separate path from the luminance signal may suffer a phase displacement relative to the phase of the reference luminance signal. |
| 5053615 |
Correction algorithm for contiguous CCD elements leakage |
October 1, 1991 |
| A row scanner (24) sequentially reads signals derived from charges on an array (10) of photosensitive elements disposed in rows and columns, and serially applied the resulting signals to a finite impulse filter (30). Within the finite impulse filter (30), the resulting signal serially re |
| 4862271 |
Video signal interpolator with peaking |
August 29, 1989 |
| In a video signal expanding/compressing system including a video signal interpolator, video signals are peaked prior to interpolation. The amount of peaking is controlled in response to a signal representative of the distance between a pixel of an expanded/compressed video signal and a |
| 4853766 |
Widescreen video signal processor with auxiliary modulated by widescreen information |
August 1, 1989 |
| A widescreen television signal having left side, right side and center panel information is converted into a signal compatible with a standard television system, such as NTSC. In the compatible signal, center panel information is expanded to occupy the standard display region seen by a |
| 4731648 |
Interstitial signal generating system |
March 15, 1988 |
| A system for generating an interstitial signal for a double scanning non-interlaced (progressive scan) television display is disclosed. When no motion is detected in the neighborhood of the interstitial pixel, a pixel generated from pixels in the adjacent fields to that of said interstit |
| 4703340 |
Frequency division multiplexed analog to digital converter |
October 27, 1987 |
| A digital television receiver, having a line locked clock, includes a first digital phase locked loop which regenerates quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of composite video signals into color inform |
| 4700217 |
Chrominance signal phase locked loop system for use in a digital television receiver having a li |
October 13, 1987 |
| A digital television receiver which uses a line-locked clock signal employs chrominance signal demodulation circuitry which produces a digital oscillatory signal that is locked in phase to the color reference burst signal component of the incoming video signals. An analog voltage con |
| 4694327 |
Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop |
September 15, 1987 |
| A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the sampling clock signal and de |
| 4686561 |
Vertical detail information restoration circuit |
August 11, 1987 |
| In a composite color video signal, a portion of the signal spectrum is shared by high frequency vertical detail information, and high frequency modulated color difference (I) information. A circuit is described which determines whether the information in the shared frequency band is |
| 4686560 |
Phase locked loop system including analog and digital components |
August 11, 1987 |
| A digital television receiver, having a line-locked clock, includes a partly digital, partly analog phase locked loop. This phase locked loop regenerates two quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of the |
| 4663653 |
Vertical detail enhancer |
May 5, 1987 |
| A vertical detail enhancer for use in a progressive scan video signal processor is disclosed. An interstitial luminance signal producer produces interstitial luminance signals in response to interlaced luminance signals from a source of such signals. Means modify the interlaced and i |
| 4651196 |
Adaptive control of the chrominance signal frequency response in a video signal processing syste |
March 17, 1987 |
| A digital television receiver, which uses a comb filter to separate the luminance and chrominance components of composite video signals, includes an adaptive band-pass filter for processing the comb filtered chrominance signals. Comb filtered chrominance signals may include luminance ver |
| 4594610 |
Camera zoom compensator for television stereo audio |
June 10, 1986 |
| A stereophonic television signal processing arrangement includes a television camera having a zoom lens capable of wide and narrow viewing angles. A sensor coupled to the zoom lens generates a control signal indicative of the current field of view. An audio signal generator such as a |
| 4513323 |
Buzz reduction for intercarrier type television sound detection |
April 23, 1985 |
| A television receiver in which a modulated IF picture carrier, after passing through a sloped attenuation region of an IF amplifying stage, is used to produce an intercarrier sound signal. An audio buzz reduction system is provided in which phase modulation of the IF picture carrier |
