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Twiddle twaddle
by Simon at 14:11 25/07/03 (Blogs::Simon)
The problem:

You can't have synchronised 'simulcasts' of the BBC Proms, Glastonbury, etc on radio and TV any more. Unlike in the good old days when everything was analogue, the digital image received via one device (ie TV) and the (most usually) FM analogue audio received via another (ie hi-fi) are always going to have different propagation delays inherent through their separate broadcast chains.

On BBC Radio 4's "Feedback" programme today, this complaint was aired regarding the current broadcasts of the Proms on BBC 4 (available via digital terrestrial and satellite TV) and BBC Radio 3 (via FM, MW, dab, satellite) - the lack of sync 'ruining the experience' for the viewers who wrote in to the programme to ask why this was the case.

The response was given that considerable research had been done by the BBC upon this matter and unfortunately there was 'no technical solution' to this problem, and even if they could fix it in one place (which they can't), it would still be out of sync in other parts of the country.

Well, think about it a different way then!

The answer:

A component that plugs into the output side of the device that happens to be 'ahead' (eg FM radio) of its desired simulcast partner (eg digital TV), comprising a rotary dial and a bucket-brigade delay chip.

The viewer wishing to watch and listen with vision and sound synchronised introduces a delay (set by twiddling the dial appropriately) to their radio output such that the audio is then in sync with the video being received by the TV.

Fiver a time, bish-bosh, problem solved.

You should be able to buy them directly off the BBC website, as well as in every consumer electrical outlet. Heck, it's cheap enough to build that the BBC could give 'em away on demand.

I'd call it the 'Simulcastermaster' :-)

NB: This assumes the most probably situation is that the audio is leading the video - which could, in fact, be engineered at source to always be the case. In the event that the video is leading the audio, then I'm afraid we need 'slow glass' :-)


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Twiddle twaddle Simon - 25/07
    InterociptorsRUs David Crowson - 25/07
    Or... Bruce Ure - 12/01
       I didn't invent the problem :-... Simon - 12/01
          Granted :-) Bruce Ure - 12/01
             Re: Granted :-) Simon - 12/01