Abstract: A subnyquist sampling filter which results in less loss of picture resolution. An adaptive prefilter perform low-pass filter processing on a series of picture signals sampled in the form of a square lattice in a direction in which it has been determined that the degree of change of the picture signal at the periphery of an extracted picture element is a minimum. An adaptive interpolation filter performs interpolation processing on the picture signal obtained by subnyquist sampling with a subsampler the picture signal output from the adaptive prefilter in the direction where the degree of change of the picture signal level at the periphery of the abstracted picture elements is a minimum.

Abstract: A luminance and chrominance signal separation circuit for use in a video tape recorder wherein in the recording mode a three-line comb filter is made to be an adaptive type comb filter for separating a luminance signal from a chrominance signal and in the playback mode the comb filter is made to eliminate residual chrominance signal components in the luminance signal. Switching circuits are provided in the invention to permit the switching of the luminance and chrominance signal separation circuit between recording and playback modes and noise reduction is accomplished by a feedback line correlation circuit.

Abstract: An encoder for encoding color video signals into a composite color video signal comprises a matrix 1 for providing luminance and color difference signals. Modulators 4, 5 modulate a chrominance signal. The luminance signal is supplied to a filter 7 controlled by a control circuit 8 so that, when luminance signal components at or near the sub-carrier frequency are detected by the circuit 8, they are attenuated by the filter 7.

Abstract: An image squeezing circuit produces an output image carrying signal for reproducing a small-sized image 1/m times larger than an ordinary-sized image (where m is an integer not less than two), and an input image carrying signal is separated for producing an analog chrominance subcarrier signal, an analog luminance signal and a color subcarrier signal, wherein the analog luminance signal is sampled with a sampling signal n/m times larger in frequency than the color subcarrier signal (where n is an integer not less than three) for producing a decimated digital luminance signal but the analog chrominance subcarrier signal is sampled with another sampling signal n times larger in frequency than the color subcarrier signal in every m pulse intervals of the color subcarrier signal for producing a decimated digital chrominance signal, the decimated digital luminance signal and the decimated digital chrominance signal being supplied to respective digital-to-analog converting circuits in response to a high frequency p

Abstract: In a television image display apparatus, one field of an input video signal is divided into a plurality of areas in each of which image information is sampled, and an arithmetic processor provides a video control signal on the basis of preset adjusting data received from a memory and the sampled image information. Luminance, chrominance or sharpness levels can be automatically controlled for each field by such video control signal to maintain the video display in an optimum state. Noise problems typically associated with dark images or weak electric fields are eliminated, while improving the image quality by adjusting the video output for each field.

Abstract: A sub-screen generator used in displaying a single or a plurality of sub-screens concurrently with a main screen when reproducing video signals on TV.

Abstract: A three dimensional luma/chroma separation system with vertical detail generation is disclosed. The disclosed separation system uses three multiplexers to provide continuous, optimal separation of luma and chroma according to one of three separation or combing techniques as well as to provide the appropriate vertical detail signal for each luma/chroma separation technique. The disclosed system further provides input/output capability with special case applications, such as Super VHS format equipment and signals. Operation of the multiple multiplexers is controlled by signals generated according to actual picture content.

Abstract: A high definition television system that is characterized by low transmission bandwidth is achieved by in a manner removing much of the redundancies in the signal, efficiently encoding the remaining signals, and transmitting the encoded signal in a manner that is most compatible with the applicable standards. Specifically, the television signal is encoded by developing motion vectors that describe the best motion estimate of the image to be transmitted, by developing motion estimation error signals, by encoding these error signals within the same bandwidth as occupied by standard NTSC signals and by transmitting the encoded error signals during periods that correspond to the active scan intervals of the NTSC TV signal. The motion vectors themselves, together with video and control signals, are transmitted during the NTSC retrace period.

Abstract: A television system includes a plurality of complementary transmitter and receiver stages for processing an HDTV signal to minimize co-channel interference to and from NTSC signals, thereby facilitating the use of so-called "taboo" channels for the transmission of HDTV signals. The HDTV signals are encoded for transmission in a format exhibit dominant periodicities equivalent to that of NTSC to further minimize such co-channel interference.

Abstract: In a digital video signal processing circuit where digital composite video signals are inputted and processed in separation into a luminance signal and a chrominance signal, the digital video signal processing circuit is provided with a device for separating a first frequency component including a luminance signal in a relatively low region from the digital composite video signals, a device for separating a second frequency component including a luminance signal in the vicinity of a color subcarrier and a chrominance signal, a line comb-shaped filter for separating the second frequency component into the luminance signal in the vicinity of the color subcarrier and the chroninance signal, an adding device for adding the first frequency component and the luminance signal in the vicinity of the color subcarrier, a phase inversion device for inverting the phase of the chrominance signal, and an adding device for adding the chrominance signal in phase inversion to the first frequency component or the luminance sig

Abstract: A video signal is sampled with a sampling frequency which is at least four times of the highest frequency of the video signal, subsequently, sampled signals are converted into digital signals and component thereof which are higher than the highest frequency of the video signal are eliminated by a low pass filter, then, remaining sampled signals are alternately decimated by a decimation circuit, thus the sampling frequency is reduced in appearance to the half thereof.

Abstract: A high definition television system that is characterized by low transmission bandwidth is achieved by removing redundancies in the signal and encoding the remaining signals. In the encoding, a portion of the signals to be transmitted is created in the form of an analog signal or a concatenated plurality of pulse amplitude coded samples (A-signal), and another portion of the signals to be transmitted is created in digital form (D-signal). The D-signal is consigned to a specified portion of the transmitted signal, leaving the remainder of the transmission capacity for the A-signal. When the normally created digital signals do not fully occupy the digital portion, enhanced operation results when selected ones of the analog signals or samples are excised from the A-signal, encoded digitally, and added to the D-signal. The excising of those signals leaves room in A-signal portion to include additional analog signals. This leads to an overall better image reproduction at the receiver.

Abstract: In a picture-quality improving circuit, a luminance transition is detected on the basis of a luminance signal. Chroma edge characteristics of a color signal are enhanced in accordance with the detected luminance transition. A detection is made as to whether the color signal and the luminance signal are correlated or uncorrelated in transition. When the color signal and the luminance signal are uncorrelated in transition, the enhancement of the chroma edge characteristics of the color signal is interrupted.

Abstract: An image transmission system includes a modulating part for independently modulating a luminance signal and two kinds of color difference signals and a demodulating part for independently demodulating the modulated luminance signal and the two kinds of modulated color difference signals. The demodulating part includes a signal correcting part for shifting at least one of the modulated luminance signal and the two kinds of modulated color difference signals by a predetermined number of picture elements in a scanning line direction to correct an error introduced by the modulation.

Abstract: A signal processing apparatus in a television signal transmitting system includes: a first group of delay lines for obtaining a first series of parallel signals; a first group of coefficient multipliers for weighting the first series of signals; a first adder for adding outputs of the first group of coefficient multipliers; a second group of delay lines for obtaining a second series of parallel signals; a second group of coefficient multipliers for weighting the second series of signals; a second adder for adding outputs of the second group of coefficient multipliers and one of the first series of signals; and a transmitter for transmitting output signals from the first and second adders.

Abstract: A color television receiver having an automatic white control circuit which includes a detection circuit for detecting whether or not a given magnitude of a cathode current of a CRT flows, and generating a detection signal when the cathode current exceeds the given magnitude; and an interruption circuit for interrupting the supply of a video signal to the CRT until a given period of time has elapsed after the generation of the detection signal. The heat-up of the cathode of CRT is detected by the generation of the detection signal. The interruption circuit makes the CRT free from the video signal for the given period of time after the heat-up, so that no raster with maximum brightness appears after the power-on of the television receiver.

Abstract: In a method of encoding a television signal in accordance with a plurality of operations each providing another distribution of temporal and/or spatial distribution, at least one of said operations including estimation of motion vectors for first frames out of pairs of television frames and/or estimation of pointers to motion vectors for second frames out of said pairs of television frames, said method further comprising encoding a digitally assisting signal into binary codewords comprising informations about said motion vectors, said pointers and/or according to which one of said plurality of operations the television signal is encoded, a Hamming-distance between a first codeword indicating an operation providing a maximum spatial resolution, and a second codeword indicating an operation providing a maximum temporal resolution, is at least one half the number of bits of each codeword, so that a fail-safe and efficient method is obtained.

Abstract: A video line digitizer for digitizing predetermined lines of successive fes of a composite video signal includes a video line digitizer for converting the analog component of the video signal into a series of digital data representations. The composite video signal consists of successive frames. The frames each consist of a fixed number of lines represented by a fixed number of pixels. The pixels each have an associated intensity value reflected in the resulting digital data representations. The video line digitizer also provides synchronization signals decoded from the composite video signal to an address decoder/controller which determines the beginning of each horizontal line of the image. A high-speed RAM receives the digital data representations from the video line digitizer and stores them in address locations provided to the RAM by the address decoder/controller when the RAM is enabled by a data processor.

Abstract: A high definition television acoustic charge transport filter bank significantly lowers the amount of digital processing needed in a high definition television. The filter bank effects frequency shifting by undersampling input waveforms to create aliasing, and by sampling output waveforms to shift received signals up in frequency. The filter bank is highly accurate and inexpensive because of the simple acoustic charge transport filter structure, high charge transport efficiency, linear phase and sample data operation.

Abstract: A system for generating interpolation signals for a progressive scanning conversion television system. The sysetem includes a Y/C separator for separating the luminance (Y) and chrominance (C) signals from a composite video signal, an interpolation Y signal generating circuit for receiving the separated Y signal and generating an interpolated Y signal, the interpolation Y signal generating circuit including at least one low pass filter to remove the high frequency signal components from the separated Y signal and a circuit to alternately provide the separated Y signal and the interpolated Y signal along with the C signal to generate a progressive scanning television signal.