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Old 17th Jan 2009, 1:09 pm   #7
ENGLISH VICTOR
Hexode
 
Join Date: Feb 2008
Location: Sydney, Australia
Posts: 356
Default Re: 625-Line Television Broadcast Standards

Other advantages for adopting System I is near full chrominance bandwidth to be transmitted in both chroma sidebands, it also enables the chroma /sound beat to occour outside the the chroma bandpass limit i.e. 1.566MHz. as compared to system B/G with a 1.067MHz. beat. The result can look like coloured herringbone interference. Also Quadradure envelope distortion is minimised during chroma transients as a result of equal bandwidth non vestigial chroma sidebands.The problem is best seen during the transistion between the green and magenta bars on standard colour bars when receiving systemB/G. The P.A.L. system certainly helps minimise the problem however.
Victor.
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