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Old 6th Oct 2022, 4:46 pm   #40
marceljack
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Join Date: Apr 2021
Location: Paris, France.
Posts: 235
Default Re: Sony KV-A2942U very soft focus in middle of screen

Quote:
Originally Posted by simpsons View Post
I can't remember if CTI was switchable in UK sets. I believe it was introduced to compensate for the characteristics of the 5.5Mhz video bandwidth found in Europe whilst the BBC used 6 Mhz to improve the chrominance slope.
Chris
Hi Chris,
I think CTI was also useful in the I system as even with 0,5 MHz more video bandwidth the choma BW is sill about 1/4 of the luma BW.
But it's in SECAM that the improvement was the most impressive (on a colour bar pattern) because of the very bad transient response between saturated colours due to the effrect of the deemphasis on the truncated maximum frequency deviation and amplitude.
But even then it did not make much difference on real pictures.
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