[sdiy] help with strange BBD chips (sony) (Kenwood time delay)

[Roy J. Tellason]

On Tuesday 27 May 2008 20:11, Mike wrote:
> > Your reference to the VCR could well be video delays for some purpose.
> > Optical one line delays were
> > used for error correction and are usually 2 transducers and a quartz
> > block hence the physical size.
>
> The one's used for PAL TV were typically 64uS (1 line time),  I don't think
> NTSC used error correction, (hence the appellation "Never Twice Same
> Colour).

The ones used in NTSC sets were because there was a significant amount of time 
required for the signal to go through a number of stages in terms of color 
processing,  way more for that than the video component,  so the delay was 
necessary to have things line up properly.  I'd never heard of them being 
used for error correction before,  though one of the VCRs I scrapped out was 
a unit capable of handling those European-type signals.

> You'd need rather a lot to do anything with audio.

I have a number of them on hand,  but I don't think that I have that 
many!  :-)

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