Apparatus for converting the format of video signals based on frequency and composition ratio
AssigneeSamsung Electronics Co., Ltd.
InventorDong-jin Go
Life of this patent
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Abstract
A video signal format converting apparatus is provided for doubling a horizontal/vertical frequency, and converting the composition ratio of a luminance signal and color-difference signals, by which both horizontal/vertical frequency-converted and frequency-unconverted input signals can be processed. In this apparatus, external input signals not yet scan frequency-doubled and those scan frequency-doubled are controlled to be all processed. Thus, various input signals can be processed, and an external input signal not yet scan frequency-doubled can be processed even without installing a special scan conversion device.
Claims14
An apparatus for converting decoded video signals and external input video signals R, G, and B, into signals having formats which are required by a signal processor, the apparatus comprising:
- an analog-to-digital (A/D) converter for converting the external input video signals into digital signals;
- a space converter operative to convert the R, G, and B digital signals output from the A/D converter into a luminance signal Y and color-difference signals U and V;
- a first format converter operative to convert the composition ratio of the Y, U, and V signals of the space converter into a Y:U:V composition ratio that is the same as the composition ratio of the decoded image signals;
- a first multiplexer operative to receive the decoded video signals and the Y, U, and V signals output from the first format converter, and selecting and outputting one group of input signals according to a first selection control signal;
- a horizontal/vertical frequency converter operative to double the horizontal or vertical frequency of output signals of the first multiplexer;
- a second format converter operative to convert the composition ratio of the output signals of the horizontal/vertical frequency converter into the composition ratio of the luminance signal and the color-difference signals which is suitable for the signal processor;
- a second multiplexer operative to receive the output signals of the second format converter and the output signals of the space converter, and selecting and outputting one group of input signals according to a second selection control signal;
- and
- a controller, responsive to a mode selection signal and being operative to generate first and second selection control signals for said first and second multiplexers, respectively, depending on the horizontal/vertical frequency of the external input signals R, G, and B and on whether the external input signals are to be output.
A method of converting decoded video signals and external input video signals R, G, and B, into signals having formats which are required by a signal processor, the method comprising:
- converting analog external input video signals into first digital signals comprising R, G and B digital signals
- converting the R, G, and B digital signals into second digital signals comprising a luminance signal Y and color-difference signals U and V;
- converting the composition ratio of the Y, U, and V signals into third digital signals comprising converted Y, U and V signals having a Y:U:V composition ratio that is the same as the composition ratio of the decoded image signals;
- receiving the decoded video signals and the third digital signals and selecting and outputting one group of received signals according to a first selection control signal;
- doubling the horizontal or vertical frequency of the selected group of received signals;
- converting the signals having the doubled horizontal or vertical frequency into ratio-adjusted signals having a composition ratio of the luminance signal and the color-difference signals which is suitable for a signal processor;
- receiving the ratio adjusted signals and the second digital signals, and selecting and outputting one group of said signals according to a second selection control signal;
- and
- in response to a mode selection signal, generating said first and second selection control signals depending on the horizontal/vertical frequency of the external input signals R, G, and B and on whether the external input signals are to be output.
Dependencies are inferred from the claim text.