On Tue Jan 2 20:23:46 2024 NY wrote:

On 02/01/2024 19:29, J. P. Gilliver wrote:

In message <kvj53iFd847U1@mid.individual.net> at Tue, 2 Jan 2024
19:05:21, John Williamson <johnwilliamson@btinternet.com> writes

It let them use the same crystals for sample timing as for the PAL
colour sub carrier, if I remember correctly. Meant they cost pennies
instead of pounds when the first CD players came out.

Oh, I thought it was because of the two different video standards
(625/25 and 525/30) and the need to find a rate that could be converted
to both of those.

Yes I thought it was a frequency that was usable on both TV systems.

I hadn't realised that recording sound digitally on videotape pre-dated
the CD standard and therefore determined the CD sampling rate. I'd
always thought that sound-on-videotape came after CDs.

The length of early CD's appears to be dictated by the longest U-Matic available, which was 74 minutes and made by BASF

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