Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-03-05
1993-12-28
Powell, Mark R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358141, H04N 1102
Patent
active
052744442
ABSTRACT:
A video signal processor for reproducing a MUSE signal in the form of a Hi-vision signal. In transmitting a Hi-vision television signal, a signal obtained by thinning out the complete group of sampling points which are extracted from the original Hi-vision video signal in accordance with a predetermined rule is transmitted. A video signal processor in a TV set completes sampling points which are thinned out on the transmission side by interpolation. In a conventional video signal processor, since it is necessary to process a signal at a digital portion at a high speed, the circuit must be composed of elements which operate at a high speed. It is also necessary to use a low-pass filter having a sharp cutoff characteristic in the process of cutting off the high-frequency component of the output signal. In the present invention, an input signal is first subjected to time base expansion and the horizontal frequency characteristic is adjusted by the high-pass filter and the band-rejection filter, thereby enabling signal processing at a comparatively low speed. Thus, a predetermined horizontal frequency characteristic is realized by a cheap low-pass filter. A color signal interpolated between fields is produced from the data interpolated between frames by passing the data interpolated between fields through a low-pass filter and a bandpass filter, and adding the respective outputs, thereby removing the vertical line disturbance due to the variation in the clamping level between fields which is a problem remaining unsolved in the related art.
REFERENCES:
patent: 4979040 (1990-12-01), Masumoto
patent: 5018010 (1991-05-01), Matsumoto
patent: 5128759 (1992-07-01), Matsunaga
patent: 5148270 (1992-09-01), Someya
"An HDTV Broadcasting System Utilizing a Bandwidth Compression Technique-MUSE" IEEE Transactions on Broadcasting, vol. BC-33, No. 4, Dec. 1987.
Mitsubishi Denki & Kabushiki Kaisha
Powell Mark R.
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