Document Type and Number:
Japanese Patent JPH0355079
Kind Code:
B2
Abstract:
Apparatus for and a method of decoding a video colour signal provides a digital wide band luminance signal. An analog signal Yl representing the low band luminance component of a coded video colour input signal Icv, is obtained at a first analog filter 1. An analog signal Yhc representing high band luminance and chrominance components is obtained at second means (5) which subtracts the first analog signal Y1 from a delayed input signal Icv. Signal Yhc is synchronously demodulated to provide (B-Y) and (R-Y) chrominance component signals U1, V1, which are digitised. Via digital delay means, single line delayed signals Ydl, U0, V0 and double line delayed signals U-1, V-1 are obtained. High band luminance signals Yu, Yv are then obtained as a function of at least two of the respective chrominance component signals U1, U0 and U-1; and V1, V0 and V-1. These signals Yu, Yv are remodulated and combined to provide a digital high band luminance component signal Yh. Finally, by digitally summing the digital signals Ydl and Yh a digital wide band luminance output signal Yd is obtained. Two different functions for obtaining the high band luminance components are exemplified. Wideband chrominance signals are also provided.
More Like This:
| JPH09251795 | ANALOG DELAY CIRCUIT |
| JP3166874 | AUTOMATIC GAIN CONTROL METHOD FOR DIGITAL COLOR DEMODULATION |
Application Number:
JP8859787A
Publication Date:
August 22, 1991
Filing Date:
April 10, 1987
Export Citation:
International Classes:
H04N9/66; H04N9/78
Next Patent: PICTURE INDICATOR OF PINBALL MACHINE