Adaptive type color demodulation apparatus for PAL system

An adaptive type color demodulation apparatus for a PAL system transmission having a plurality of scanning lines, each one of said scanning lines having a luminance signal and a PAL system chrominance signal, said adaptive type color demodulation apparatus comprising:

• first color demodulation means for demodulating the PAL system chrominance signal using at least two scanning lines of the plurality of scanning lines to produce a first output signal;
• second color demodulation means for demodulating said PAL system chrominance signal from at least one of the plurality of scanning lines to produce a second output signal;
• vertical correlation detecting means for detecting a vertical correlation between a first luminance signal of a first scanning line from the plurality of scanning lines and a second luminance signal from a second scanning line of the plurality of scanning lines to be demodulated at said first color demodulation means to produce a detected result;
• and
• selecting means for selecting one of the first output signal of said first color demodulation means and said second output signal of said second color demodulation means in response to the detected result of said vertical correlation detecting means.

A method for demodulating a PAL system transmission having a plurality of scanning lines, each of said plurality of scanning lines having a PAL system chrominance signal, said method comprising the steps of:

• demodulating the PAL system chrominance signal using at least two scanning lines of the plurality of scanning lines and for producing a first output signal;
• demodulating the PAL system chrominance signal from at least one of the plurality of scanning lines to produce a second output signal;
• detecting a vertical correlation between two PAL system chrominance signals separated by two horizontal periods to produce a detected result;
• and
• selecting one of the first output signal and the second output signal in response to the detected result.

A method for demodulating a PAL system transmission having a plurality of scanning lines, each one of said scanning lines having a luminance signal and a PAL system chrominance signal, the method comprising the steps of:

• demodulating the PAL system chrominance signal using at least two scanning lines of the plurality of scanning lines to produce a first output signal;
• demodulating the PAL system chrominance signal from at least one of the plurality of scanning lines to produce a second output signal;
• detecting a vertical correlation between a first luminance signal of a first scanning line from the plurality of scanning lines and a second luminance signal from a second scanning line of the plurality of scanning lines to produce a detected result;
• and
• selecting one of the first output signal and said second output signal in response to the detected result.