DEVICE AND METHOD FOR CONVERTING SCANNING

Title:

DEVICE AND METHOD FOR CONVERTING SCANNING

Document Type and Number:

WIPO Patent Application WO/1998/052183

Kind Code:

A1

Abstract:

An A/D converter (6) digitizes input video signals by using a clock pulse (53) from a VCO (4) of a PLL circuit (1). The frequency of the pulse (53) is fixed. After a pre-processing circuit (7) changes the number of scanning lines, the digital video signals are written in a field memory (10). From the momory (10), the video signals are read out by using a second clock pulse (63) generated from a PLL circuit (11). The frequency dividing ratio of a frequency divider (15) of the PLL circuit (11) is changed by means of a control signal. When the frequency dividing ratio is changed, the frequency of the clock pulse (63) is changed and the number of samples in 1H-section of the video signals read out from the memory (10) is changed. Since the number of the pixels in an effective video section of the written video signals is fixed, the ratio of the range of the 1H-section to that of the effective video section can be changed and, accordingly, horizontal size adjustment can be performed by changing the number of samples in the 1H-section on the reading-out side.

Inventors:

MIYAZAKI SHINICHIRO (JP)
KONDO MAKOTO (JP)

Application Number:

PCT/JP1998/002065

Publication Date:

November 19, 1998

Filing Date:

May 11, 1998

Export Citation:

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Assignee:

SONY CORP (JP)
MIYAZAKI SHINICHIRO (JP)
KONDO MAKOTO (JP)

International Classes:

G09G1/16; G09G3/20; G09G5/00; G09G5/18; G09G5/391; H04N7/01; H04N5/12; (IPC1-7): G09G5/00

Foreign References:

JPH06138834A	1994-05-20
JPH066631A	1994-01-14
JPH04360194A	1992-12-14
JPH08186801A	1996-07-16
JPH08116470A	1996-05-07
JPH07336593A	1995-12-22

Other References: