Television receiver capable of enlarging and compressing image

Details Television receiver capable of enlarging and compressing image Television receiver capable of enlarging and compressing image

1994-06-16

1996-07-09

Metjahic, Safet

Television

Format conversion

Conversion between standards with different aspect ratios

348448, 348556, H04N 701

Patent

active

055349340

ABSTRACT:
To provide an image which is matched with an aspect ratio of a screen of a display unit by compressing and enlarging the whole of the image to a desired size. A video signal is sequentially written into a field memory in response to a write clock from an input terminal. A clock generating circuit supplies the field memory with a read clock having a frequency which is about 4/3 times as high as that of the write clock. A vertical enlargement control circuit reads a video signal from the field memory with a line period corresponding to a magnification factor and inhibits writing to a one-line memory with the same period to provide a line delayed output for an output signal from the field memory. A vertical interpolating circuit generates a scanning line signal by an interpolation operation in accordance with a control signal from the vertical enlargement control circuit.

REFERENCES:
patent: 4528585 (1985-07-01), Bolger
patent: 4605952 (1986-08-01), Powers
patent: 4760455 (1988-07-01), Nagashima
patent: 4951149 (1990-08-01), Faroudja
patent: 5021719 (1991-06-01), Arai et al.
patent: 5243421 (1993-09-01), Nagata et al.
patent: 5276515 (1994-01-01), Katsumata et al.
patent: 5283651 (1994-02-01), Ishizuka
patent: 5343238 (1994-08-01), Takata et al.
patent: 5351087 (1994-09-01), Christopher et al.
Patent Abstracts of Japan, vol. 12, No. 474, 12 Dec. 1988 & JP-A-63 193 779 (Matsushita Electric Industrial Co., Ltd.) 11 Aug. 1988.
Patent Abstracts of Japan, vol. 13, No. 490, 7 Nov. 1989 & JP-A-01 194 784 (Matsushita Electric Industrial Co., Ltd.) 4 Aug. 1989.

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