Matsushita Electric Industrial Co., Ltd.

Matsushita Electric Industrial

Atsushi Ishizu

Kiyoshi Imai

Masaki Tokoi

Yoshio Seki

Yoichiro Miki

Masanori Hamada

Yutaka Nio

Kenta Sokawa

Masatoshi Nakano

Takashi Yamaguchi

Toshiaki Tsuji

Hideyo Uwabata

Masaaki Fujita

Hideto Nakahigashi

Satoru Inagaki

Tetsuji Maeda

Kenjirou Tsuda

Etsuyoshi Sakaguchi

Toshiaki Kitahara

Chikara Gotanda

Shuuhei Taniguchi

Miho Nagai

A broadcasting reception apparatus includes a display unit for presenting a display showing a plurality of channels, with which the user can recognize whether decoding software programs for decoding program signals being currently broadcast via each channel are held in a library buffer, or not, thereby making possible pleasant zapping.

Broadcasting reception apparatus and data broadcasting method

In a noise reducer whose S/N improving amount is variable, as to such a region where image quality deterioration caused by the noise reducer becomes relatively apparent, and both a luminance level and a chroma level are low, the S/N improving amount thereof is decreased. To the contrary, as to such a picture having a dark high frequency range component and a small movement component, no control is made of the S/N improving amount by the above-described luminance level and chroma level, but the normal S/N improvement is sufficiently carried out.

Video signal noise reduction apparatus with variable S/N improving amount

A television receiver comprising an information extracting circuit for extracting information from a format or content of an input video signal, a video signal processing circuit for processing this video signal by a program or data, a memory for storing the program and data, a CPU for controlling, operating or driving these elements, and a display device for displaying an image. The video signal processing circuit can, under the control of the CPU, decode the signal, correct or set the picture quality such as gradation and sharpness, or adaptively process an on-screen display based on the input video signal. The television receiver is also able to adaptively extend the functions of the television receiver corresponding to various signal formats.

Television receiver that provides gradation correction using a CPU

A video signal conversion apparatus for converting high definition television signals band-width compressed by offset sub-sampling to a conventional standard television signal while removing aliasing interference caused by offset sub-sampling and using less memory capacity than is conventionally required is provided. The image of the sub-sampled signal is restored from the sampling points in the current field by an intra-field interpolation circuit, and the number of scan lines is reduced to the same number in the standard television signal format by a scan line number conversion circuit. Half of the pixels in the current field are then substituted into the signal for the one previous frame for inter-frame interpolation by a signal selector which alternately selects a signal from the scan line number conversion circuit and a signal from field memories, and a time-base operation for removing aliasing interference at the standard television signal rate is executed.

Video signal converting apparatus with reduced processing for aliasing

In a video signal processing apparatus for restoring a signal which has been bandwidth-compressed by offset sub-sampling after restoring an image from sample points of a same field of a sub-sampled signal, a first adder performs an inter-field averaging process from inter-field signals before or after three adjacent fields. A second adder performs an inter-frame averaging process from inter-frame signals. One field difference and one frame difference are detected from the three adjacent inter-field signals thereby switching an output signal of the first adder and an output signal of the second adder in accordance with the magnitudes of the differences thus detected. In this way, aliasing interferences accompanied with bandwidth compression can be detected. By selecting an optimum eliminating filter, aliasing interference due to interfield sub-sampling and aliasing interference due to inter-frame sub-sampling can be eliminated.

Video signal processing apparatus for reducing aliasing interference

A television signal converting apparatus receives a high definition television signal which is processed approximately linearly on the transmission and receiving sides and whose transmission only is processed non-linearly. A non-linear level correction circuit is provided, which collectively simultaneously carries out two kinds of non-linear processes, namely, a transmission inverse gamma correction and a CRT gamma correction, which are executed on the transmission side, thus precisely reproducing the signal level of a luminance signal by using a small-scale circuit.

HDTV to conventional TV signal converting apparatus with non-linear

A noise reduction apparatus for use in a television receiver or VCR using the NTSC format, in which a video signal or a demodulated color difference signal is processed by an operational circuit which supplies a noise-reduced output signal to a first one of two series-connected one-frame delay elements and which compares the input video signal with an output signal from the first 1-frame delay element, to execute noise reduction. A degree of noise reduction executed by the operational circuit is controlled in accordance with the degree of correlation between the output signal from the second 1-frame delay element and the input video signal, such that the degree of noise reduction is made small or zero when the correlation is below a predetermined level, indicating the presence of motion components in the video signal. Due to the 2-frame delay used in judging that degree of correlation, the judgement will not be adversely affected by interference components of the video signal which result from interaction between the chroma and high-frequency luminance components of the video signal, when there are no motion components in that signal.

Noise reduction apparatus for television receiver

A video signal converting apparatus includes: an interpolating circuit for interpolating a non-sampling point from sampling points in a field for restoring an HDTV band-compressed by offset sub-sampling; a first delay element for delaying the interpolated signal by one field period and a second delay element for delaying an output of the first delay element by one field; a median-value selector for selecting a median-value signal from signals in three adjacent fields from the input and output of the two delay elements, and an adder for averaging the output of the first delay element and an output of the median-value selector. Alternatively, the first and second delay elements maybe disposed before the interpolating circuit rather than after the interpolating circuit. Furthermore, a time-access conversion circuit maybe disposed either before the interpolating circuit or after the adder.

Video signal converting apparatus for converting HDTV signal into

A dot crawling interference elimination device and a color subcarrier vertical correlation detection device, which comprise a color subcarrier vertical correlation detection device for a video signal, an adaptive three-dimensional Y/C separation unit, and an adaptive notch filter of a color signal band, detect vertical correlation of a color subcarrier in a non-standard signal, such as a signal reproduced from a home VCRs or a special signal reproduced from an optical VDP system, that does not strictly meet the standards of the NTSC system or the system, thereby to discriminate non-standard characteristics of the signal, and eliminate a color signal component, which mixes into a luminance signal when a motion-adaptive Y/C separation is carried out for the non-standard signal, by using an adaptive notch filter that suits a non-standard state of the input image signal.

Dot crawling interference elimination device and color subcarrier

In the NTSC color television system, a signal having a medium level in the three signals of the bands the color sub-carrier frequency of neighboring three scanning lines is substracted from the signal of the central scanning line of the three scanning lines, the resultant signal is a luminance signal containing no cross luminance, even if the composite video signal in the three scanning lines does not maintain vertical correlation.

Signal separating apparatus

A double-scanning non-interlaced television receiver performs scanning line interpolation by using a memory to reproduce a 1/60 second frame with 525 scanning lines. The receiver has a picture-in-picture (P-in-P) function which inserts a frame (sub-picture) into a part of another frame (main picture). The receiver is provided with a signal processing circuit for implementing the scanning line interpolation and a memory having a frame-wide capacity for producing a sub-picture. The receiver (1) produces a video signal for the main scanning line and a video signal for the interpolated scanning line for the main picture and a video signal for the main scanning line and a video signal for the interpellated scanning line for the sub-picture and (2) performs a double-scanning conversion, thereby providing a sub-picture without causing line flicker.

Picture-in-picture double-scanning television receiver

A device detects a correlation between frames represented by a video signal of an interlaced scanning format. A sudden motion of an object represented by the video signal is detected on the basis of the detected correlation. A normal motion of the object represented by the video signal is detected on the basis of the detected correlation. Scanning lines represented by the video signl are interpolated with changeable interpolation characteristics. The interpolation characteristics are changed in response to the detected normal motion of the object. The interpolation characteristics are changed in response to the detected sudden motion of the object.

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Takatsuki, Japan

Atsushi Ishizu