Patent
Method and apparatus for decoding and recording composite digital television signals to prevent degradation of the signals
James Hedley Wilkinson
- 30 Sep 1983
5
TL;DR: A decoder-recoder arrangement for decoding a composite digital television signal for recording on a digital video recorder and for subsequently recoding the reproduced signal, the arrangement comprising a decoder including filters, demodulators for demodulating the chrominance components, sample rate reducers for reducing the sample rates of the demodulated chrominance component, interpolators for interpolating samples into the sample-reduced demoded chrominancecomponent to restore the sample rate to the original value, modulators for remodulating the interpolated chromiance components, an adder for adding together the modulated
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Abstract: A decoder-recoder arrangement for decoding a composite digital television signal for recording on a digital video recorder and for subsequently recoding the reproduced signal, the arrangement comprising a decoder including filters for separating two chrominance components from the composite digital television signal, demodulators for demodulating the chrominance components, sample rate reducers for reducing the sample rates of the demodulated chrominance components, interpolators for interpolating samples into the sample-reduced demodulated chrominance components to restore the sample rate to the original value, modulators for remodulating the interpolated chrominance components, an adder for adding together the modulated interpolated chrominance components, and a subtractor for subtracting the output of the adder from the input composite digital television signal; and a recoder including interpolators for interpolating samples into said sample-reduced demodulated chrominance components to restore the sample rate to the orignal sample value, modulators for modulating the interpolated chromiance components obtained from the interpolators, an adder for adding together the outputs of the modulators, and a further adder for adding the output of the adder to the output of the subtractor of the decoder to derive the original composite digital television signal.
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Citations
Patent
Signal processing circuit for a solid-state image pickup device
Takashi Asaida
- 10 Nov 1989
TL;DR: In this article, a signal processing circuit of a solid-state imaging device having an image pickup section formed by plural solidstate image sensors including a discrete pixel array is disclosed.
23
Patent
Method and apparatus for encoding component digital video signals so as to compress the bandwidth thereof, and for decoding the same
James Hedley Wilkinson
- 06 Mar 1987
TL;DR: In this article, a component digital video signal is encoded such that first and second color components CB, CR are modulated on the lower sideband of a carrier at the Nyquist frequency of the luminance component Y.
14
Patent
Video signal processing apparatus for video tape recorders
Masao Tomita,Akio Hashima +1 more
- 16 Mar 1984
TL;DR: In this paper, a video signal processing apparatus used for a video tape recorder is described, where the chrominance signal is up-converted in a frequency converter (30), digitalized in an AID converter (32), and phase-shifted in a recording block (40); and, in a reproducing block (26), phase shifted in the opposite direction in a Reproducing block, filtered by a comb filter, compensated against jitter.
13
Patent
Color component signal converting apparatus having an input dependent switchable matrix
Kaite Osamu,Takahiro Yuchi,Hirotsugu Murashima +2 more
- 08 Feb 1990
TL;DR: In this article, a first component signal consisting of three primary color signals R, G and B and a second component signal comprising a luminance signal Y and two types of color difference signals P B and P R are applied to decimation digital filters.
11
Patent
Image processing apparatus with chrominance processing and luminance delay
Makoto Shimokoriyama
- 21 Mar 1995
TL;DR: In this article, a delay circuit for cancelling a time difference which occurs between a luminance signal component and a chrominance signal component of the input color video signal is provided.
3
References
Patent
Digital processing of PAL color television signals in the form of a Y signal and a composite U+V/U-V signal
Martin Weston
- 23 Dec 1975
TL;DR: In this paper, a composite chrominace signal is sampled at a frequency substantially equal to the PAL color subcarrier frequency and a luminance signal at the sub-Nyquist frequency of twice the color sub-carrier frequencies.
19
Patent
Color video recording and play back system
Y Faroudja
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TL;DR: In this article, a color video recording system where the incoming video signal is separated into chroma and luminance signals by a comb filter and the chroma signal is thereafter recorded on the lower end of the RF spectrum of the record medium and the luminance recorded at the upper end of said RF spectrum is disclosed.
16
Patent
Processing pal color television signals
John Oliver Drewery
- 30 Aug 1978
TL;DR: In this paper, a method and apparatus for transcoding digital PAL color television signals between (i) a 2Fsc format consisting of an encoded signal of PAL type sampled at 2fsc and (ii) a 3fsc format comprising of a luminance signal Y at 2-sc and a chrominance signal C sampled at fsc and comprising U+V and U-V on alternate lines, avoid the need to convert the signal to analogue PAL form as an intermediate step.
10
Patent
Hybrid sequential and carrier encoded color television transmission method and circuits
Bernhard A. Hjortzberg
- 25 Apr 1975
TL;DR: In this article, a method and circuits for encoding a color video signal for processing, preferably recording and/or playback of said signal within a limited bandwidth of not more than 3MHz without a separate channel for color information is presented.
9
Patent
Symmetrically encoded line sequential color signals
John L Rennick
- 28 Feb 1973
TL;DR: In this article, an encoding and decoding system for color television signals was proposed, where three color-difference signals represented of the color of a scene and a luminance signal representative of the brightness of the scene are symmetrically encoded as three-line sequential signals with relative amplitudes such that when the three sequential signals are matrixed in equal proportions, a brightness signal is formed representing the average luminance level of the picture over the preceding three lines.
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