On 2016-01-26 13:45:30 +0000, Jim Lesurf said:

In article , Dave Plowman (News)
wrote:

It was an issue some UK broadcast engineers noticed IIRC. They were
aware of it because a lot of radio and TV listening was in mono.

Broadcasters were using this player?

Swap cart for horse. :-) My recollection is seeing reports that some had
considered it, but rejected it because mono listeners would get rolled away
HF when mono CDs were played into the programme.

So the correct description is that the *avoided* using it when the realised
what would happen.

Jim

Just for fun, some nummbers:

The response of the comb filter caused by the delay d, relative to
simple summing is

sqr( ( 1.0 + cos ( omega * d ) ) / 2.0 )

For 11.3 us this gives -0.56dB at 10kHz, -1.3dB at 15kHz

Arthur

--
real email arthur at bellacat dot com