Adaptive deemphasis and reemphasis of high frequencies in a...

Details Adaptive deemphasis and reemphasis of high frequencies in a... Adaptive deemphasis and reemphasis of high frequencies in a...

H - Electricity

04

N

H04N 5/782 (2006.01) H04N 5/923 (2006.01) H04N 9/797 (2006.01) H04N 9/82 (2006.01) H04N 9/835 (2006.01) H04N 9/85 (2006.01)

Patent

CA 2054261

ABSTRACT OF THE DISCLOSURE A video signal recording system is disclosed which includes a circuit for generating a control signal representative of the level of the high frequency portion of a full bandwidth luminance signal. An adaptive deemphasis circuit reduces the level of the high frequency portion of the luminance signal in response to the control signal. A folding circuit folds the high frequency portion of the deemphasized luminance signal into the low fre- quency portion. The folded deemphasized luminance is combined with the control signal and recorded on the video tape. A video signal playback system is disclosed which includes a circuit for separating the previously recorded control signal from the previously recorded folded deemphasized luminance signal. An unfolding circuit unfolds the played back luminance signal to produce a wide bandwidth deemphasized luminance signal. An adaptive reemphasis circuit boosts the level of the high frequen- cy portion of the unfolded luminance signal in response to the separated control signal.

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