17-06-2019, 10:30 AM
Had no idea that VITS was a French swear word.
In practice the 2T pulse isn't quite symmetrical. This is due to limiations in the feasible filters that were originally used to define the pulse. The photo is p25 of Weaver, "Television Video Transmission Measuements". A very useful book published by Marconi Instruments in 1971. My copy is the 1979 edition. Largely now of historical interest as most of the content is not useful in the context of digital TV. You can get one at a decent price: https://www.amazon.co.uk/Television-vide...B000NZDICE
This is another useful book by Weaver. Again largely of hostorical interest: https://books.google.co.uk/books/about/T...5QAAAAYAAJ&redir_esc=y
The -ve going 2T pulse in the middle of the bar was added later.
A 1T pulse is sometimes used for testing studio equipment where the distortions are often too small to be relaibly seen on a 2T pulse. Unfortunately you can't quite accurately generate a 1T pulse with standard 13.5MHz sampling
In practice the 2T pulse isn't quite symmetrical. This is due to limiations in the feasible filters that were originally used to define the pulse. The photo is p25 of Weaver, "Television Video Transmission Measuements". A very useful book published by Marconi Instruments in 1971. My copy is the 1979 edition. Largely now of historical interest as most of the content is not useful in the context of digital TV. You can get one at a decent price: https://www.amazon.co.uk/Television-vide...B000NZDICE
This is another useful book by Weaver. Again largely of hostorical interest: https://books.google.co.uk/books/about/T...5QAAAAYAAJ&redir_esc=y
The -ve going 2T pulse in the middle of the bar was added later.
A 1T pulse is sometimes used for testing studio equipment where the distortions are often too small to be relaibly seen on a 2T pulse. Unfortunately you can't quite accurately generate a 1T pulse with standard 13.5MHz sampling
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
