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公开(公告)号：FR2549331B1
公开(公告)日：1989-01-20
申请号：FR8409915
申请日：1984-06-22
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
IPC: H04N9/77
Abstract: Digital TV receivers which digitally process chroma and luma signals in different channels and convert the digital signals to analog form before matrixing will include low pass analog filters after the DAC's to remove clock switching components. The luma and chroma analog filters will impose differing group delay on their respective signals. This creates a differential phase error between the analog signals which is corrected by predictively delaying the signal which leads in phase in the DAC. This is accomplished by using clocked digital-to-analog converters forced to operate synchronously with the data stream and appropriately delaying the clock signal applied to one of the DAC's relative to the other.
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公开(公告)号：AU571854B2
公开(公告)日：1988-04-28
申请号：AU2150983
申请日：1983-11-18
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
Abstract: In a color television receiver with a digital signal processing system, a chroma processor operates on digital samples containing color picture information to develop first and second binary coded digital signals containing two color mixture signal information such as I color mixture information and Q color mixture information. A luminance processor operates on the digital samples to develop a third digital signal containing Y or luminance information. R, G and B digital signals are related to the developed I, Q and Y digital signals by a set of coefficient multipliers. To obtain the R, G and B digital signals, the I, Q and Y digital signals are applied to a digital decoder that includes a ROM look-up table multiplier for multiplying each of the I, Q and Y signals by the appropriate coefficient multiplier. The products thus generated are summed in an adder to obtain each of the R, G and B signals. A digital-to-analog converter develops analog R, G and B voltages for driving the cathode electrodes of the television receiver color picture tube.
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公开(公告)号：FR2551605A1
公开(公告)日：1985-03-08
申请号：FR8413464
申请日：1984-08-30
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
IPC: H04N5/21
Abstract: A deghosting system incorporated in a digital television signal processing system includes a number of channels for producing digital samples of psuedo ghost signals for cancelling digital samples of respective ghost components of a contaminated video signal. Each channel includes a random access memory into which digital video samples are read and later read out of at a time corresponding to the delay between the respective ghost component and the main (desired) component of the ghost contaminated video signal. The resulting delayed digital samples are multiplied with an appropriate coefficient to generate the digital samples of the psuedo ghost signal.
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公开(公告)号：FR2523793A1
公开(公告)日：1983-09-23
申请号：FR8304395
申请日：1983-03-17
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR , ELISCU ET STEVEN MICHAEL
Abstract: The gain of the chroma signal in a digital television receiver is controlled in accordance with the value of a composite gain factor which is an accumulation of gain control factors provided by a user color control, automatic chroma control, and chroma overload. Gain control according to the composite gain factor is realized by a coarse gain block, which increments or decrements the chroma signal gain in increments of six dB, and a fine gain control over a range of six dB or less, in finely controlled increments. In a preferred embodiment, the digital chroma gain system is operated under control of a microprocessor, which receives signals representative of chroma overload, user control settings, and chroma burst amplitude. The microprocessor then calculates the composite chroma signal gain and apportions the gain between the coarse and fine gain control blocks. In the preferred embodiment of the invention, the coarse gain block comprises controlled shift registers for controlling the chroma signal gain over a range of 18 dB in 6 dB increments. The fine gain block comprises an adder and a random access memory (RAM), addressed by the chroma signal, which contains a data table computed by the microprocessor.
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Patent Agency Ranking
公开(公告)号：IT8322272D0
公开(公告)日：1983-07-27
申请号：IT2227283
申请日：1983-07-27
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
Abstract: In a television receiver with digital signal processing circuitry, a composite video signal is sampled by an analog-to-digital converter. A luminance processor responsive to the digital samples of the composite video signal develops digital luminance signals and a chrominance processor develops digital chrominance signals. A digital-to-analog converter coupled to the luminance and chrominance processors develops a plurality of analog output voltages representative of the luminance and chrominance information. A driver circuit converts the analog output voltages to drive signals that are applied to the cathode electrodes of a color picture tube to produce a display of the picture information contained in the composite video signal. A signal generator develops a control signal that is applied to a reset line of the digital-to-analog converter to establish the analog output voltages at predetermined levels. If the control signal, for example, is indicative of the blanking interval within the composite video signal, the predetermined levels established are ones that will produce a blank display.
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公开(公告)号：FR2516332A1
公开(公告)日：1983-05-13
申请号：FR8218613
申请日：1982-11-05
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR , PATEL CHANDRAKANT BHAILALBHAI
Abstract: The network is for use in a television signal receiver including a source of digital video signals 10 and produces two outputs having two different amplitude versus frequency response characteristics. A comb filter 14 produces a signal having frequency bands of luminance information signals and chrominance information signals. The chrominance signal is then subjected to filtering 22 to remove vertical detail information, the output of the subtractor 26, therefore, supplies the vertical detail information which is combined with the luminance signal Y, in the adder 30. Details of the filter 22 are given in relation to Fig. 2.
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公开(公告)号：IT8223051D0
公开(公告)日：1982-08-30
申请号：IT2305182
申请日：1982-08-30
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
Abstract: A digital filter arrangement is provided which both demodulates and filters the color mixture signals in a television receiver. Samples of a digital chrominance signal are clocked into first and second registers such that the first register is loaded with samples of a first color mixture signal and the second register contains samples of a second color mixture signal. Output taps are connected between various ones of the stages of the first and second registers and weighting function circuits. The weighting function circuits associated with each register are in turn coupled to respective ladder networks of adders, which combine the weighted signals samples so as to exhibit, at an output stage adder, a lowpass response characteristic which is appropriate for the respective color mixture signal. The two digital registers are aligned in time in accordance with their respective peak impulse response characteristic to product filtered color mixture signals in a proper timed relationship.
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公开(公告)号：IT1205616B
公开(公告)日：1989-03-23
申请号：IT2305182
申请日：1982-08-30
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR
Abstract: A digital filter arrangement is provided which both demodulates and filters the color mixture signals in a television receiver. Samples of a digital chrominance signal are clocked into first and second registers such that the first register is loaded with samples of a first color mixture signal and the second register contains samples of a second color mixture signal. Output taps are connected between various ones of the stages of the first and second registers and weighting function circuits. The weighting function circuits associated with each register are in turn coupled to respective ladder networks of adders, which combine the weighted signals samples so as to exhibit, at an output stage adder, a lowpass response characteristic which is appropriate for the respective color mixture signal. The two digital registers are aligned in time in accordance with their respective peak impulse response characteristic to product filtered color mixture signals in a proper timed relationship.
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公开(公告)号：IT1205274B
公开(公告)日：1989-03-15
申请号：IT2410782
申请日：1982-11-05
Applicant: RCA CORP
Inventor： LEWIS HENRY GARTON JR , CHANDRAKANT BHAILALBHAI PATEL
Abstract: The network is for use in a television signal receiver including a source of digital video signals 10 and produces two outputs having two different amplitude versus frequency response characteristics. A comb filter 14 produces a signal having frequency bands of luminance information signals and chrominance information signals. The chrominance signal is then subjected to filtering 22 to remove vertical detail information, the output of the subtractor 26, therefore, supplies the vertical detail information which is combined with the luminance signal Y, in the adder 30. Details of the filter 22 are given in relation to Fig. 2.
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