Wide band chrominance demodulator with color noise reduction function

A wide band chrominance demodulator with color noise reduction function comprising:

• (a) first means responsive to a TV radio wave with a given field strength, for providing a composite color video signal contained in said TV radio wave, and generating a control potential corresponding to the field strength of said TV radio wave;
• (b) second means coupled to said first means for extracting from said composite video signal a luminance signal, an I signal including orange-cyanic color information and a Q signal including green-magenta color information;
• (c) third means coupled to said second means for extracting a lower frequency band I signal from said I signal;
• (d) fourth means coupled to said second means for extracting a higher frequency band I signal from said I signal;
• (e) fifth means coupled to said first and fourth means and responsive to said control potential, for enhancing the magnitude of said higher frequency band I signal when said control potential goes over a predetermined potential, and for reducing the magnitude of said higher frequency band I signal when said control potential goes under said predetermined potential, thereby to provide a controlled higher frequency band I signal;
• (f) sixth means coupled to said third and fifth means for combining said lower frequency band I signal and said controlled higher frequency band I signal to provide a controlled I signal;
• and
• (g) seventh means coupled to said second and sixth means for decoding said Q signal and said controlled I signal to provide color difference signals.