Video signal converting apparatus with reduced processing for aliasing interference
First Claim
1. A video signal converting apparatus for converting a MUSE signal to a NTSC signal comprising:
- intra-field interpolation means for receiving an original MUSE pixel data and for inserting simulated pixel data between said original data to produce an interpolated signal;
scan line number conversion means for extracting a horizontal line from a predetermined number of horizontal lines from said interpolated signal for producing an extracted signal;
first memory means having a capacity for storing one field of the extracted signal;
second memory means having a capacity for storing one field of the extracted signal and connected in series to said first memory means for sequentially receiving data from said first memory means and for producing a delayed signal; and
selection means for alternatively selecting the pixel data from said scan line number conversion means and from said second memory means and for producing a combined signal which is provided to said first memory means.
1 Assignment
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Accused Products
Abstract
A video signal conversion apparatus for converting high definition television signals band-width compressed by offset sub-sampling to a conventional standard television signal while removing aliasing interference caused by offset sub-sampling and using less memory capacity than is conventionally required is provided. The image of the sub-sampled signal is restored from the sampling points in the current field by an intra-field interpolation circuit, and the number of scan lines is reduced to the same number in the standard television signal format by a scan line number conversion circuit. Half of the pixels in the current field are then substituted into the signal for the one previous frame for inter-frame interpolation by a signal selector which alternately selects a signal from the scan line number conversion circuit and a signal from field memories, and a time-base operation for removing aliasing interference at the standard television signal rate is executed.
21 Citations
22 Claims
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1. A video signal converting apparatus for converting a MUSE signal to a NTSC signal comprising:
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intra-field interpolation means for receiving an original MUSE pixel data and for inserting simulated pixel data between said original data to produce an interpolated signal; scan line number conversion means for extracting a horizontal line from a predetermined number of horizontal lines from said interpolated signal for producing an extracted signal; first memory means having a capacity for storing one field of the extracted signal; second memory means having a capacity for storing one field of the extracted signal and connected in series to said first memory means for sequentially receiving data from said first memory means and for producing a delayed signal; and selection means for alternatively selecting the pixel data from said scan line number conversion means and from said second memory means and for producing a combined signal which is provided to said first memory means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A video signal converting apparatus for converting a MUSE signal to a NTSC signal comprising:
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intra-field interpolation means for receiving an original MUSE pixel data and for inserting simulated pixel data between said original data to produce an interpolated signal; scan line number conversion means for extracting a horizontal line from a predetermined number of horizontal lines from said interpolated signal for producing an extracted signal; sub-sampling means for sampling every other one of the pixel data in said extracted signal and for producing a sub-sampled signal; first memory means having a capacity for storing one field of the sub-sampled signal; second memory means having a capacity for storing one field of the sub-sampled signal and connected in series to said first memory means and for sequentially receiving data from said first memory means for producing a delayed signal; and selection means for alternately selecting the pixel data from said sub-sampling means and from said second memory means and for producing a combined signal. - View Dependent Claims (9, 10)
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11. A video signal converting apparatus for converting a MUSE signal to a NTSC signal comprising:
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intra-field interpolation means for receiving an original MUSE pixel data and for inserting simulated pixel data between said original data to produce an interpolated signal; scan line number conversion means for extracting a horizontal line from a predetermined number of horizontal lines from said interpolated signal for producing an extracted signal; first memory means having a capacity for storing one field of the extracted signal; second memory means for storing one line data; third memory means having a capacity for storing one field of the extracted signal, said first, second and third memory means connected in series for sequentially sending data therethrough, said third memory means producing a delayed signal; selection means for alternately selecting the pixel data from said scan line number conversion means and from said third memory means and for producing a combined signal which is provided to said first memory means; first averaging means for taking an average between input and output signals of said second delay means and for producing a first average signal; and second averaging means for taking an average between said first average signal and said combined signal and for producing a second average signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A video signal converting apparatus for converting a MUSE signal to a NTSC signal comprising:
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intra-field interpolation means for receiving an original MUSE pixel data and for inserting simulated pixel data between said original data to produce an interpolated signal; scan line number conversion means for extracting a horizontal line from a predetermined number of horizontal lines from said interpolated signal for producing an extracted signal; sub-sampling means for sampling every other one of the pixel data in said extracted signal and for producing a sub-sampled signal; first memory means having a capacity for storing one field of the sub-sampled signal and for producing a first delayed signal; second memory means having a capacity for storing one field of the sub-sampled signal and connected in series to said first memory means and for producing a second delayed signal; third memory means having a capacity for storing one field of the sub-sampled signal and connected in series to said second memory means and for producing a third delayed signal; first selection means for alternately selecting the pixel data from said sub-sampling means and from said second memory means and for producing a first combined signal; second selection means for alternately selecting the pixel data from said first memory means and from said third memory means and for producing a second combined signal; and inter-field averaging means for taking an average between said first and second combined signals and for producing an inter-field average signal. - View Dependent Claims (19, 20, 21, 22)
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Specification