Hi,
It would have been difficult "in t'owld days" using dsp's with their
(then) very small memories and the requirement to use assembler because of
the general lack of high performance high level language compilers. Pretty
certain it could be done with an ARM with C or C++ these days. However, it
would still take quite a bit of work for a pretty small market. If it ever
gets done it'll be by someone who is either (a) a masochist or (b) in
desperate need with a pile of vital tapes and no pcm units available.
There wouldn't be any problem with patents for the PCM units as they were
first marketed 30 years ago which would put patent dates at 21 years or
more so they would have expired - Dolby A (which was introduced in 1966),
Dolby B (1968) and Dolby SR (1986) all fall into the same category.
Dave
On 29 April 2013 18:37, Kees de Visser <[email protected]> wrote:
> On 29 Apr 2013, at 18:42, umashankar manthravadi wrote:
> > many years ago, I tried to convince people it is worth producing a
> software PCM F-1 decoder, using a low cost video card and a a VHS player
> (all our PCM F1 recordings are on VHS). I thought it would be simple, but
> nobody showed any interest. Umashankar
>
> A good friend of mine is a gifted DSP programmer and I remember having
> asked him years ago if he could make what you describe. He probably could,
> but it's not easy, will take many hours to develop and the potential user
> base is very small.
> Have you checked if there are any (Sony) patents that could pose problems ?
> Great idea though (same for a software Dolby A/SR decoder, which isn't
> avaialble AFAIK).
>
> Kees de Visser
> Galaxy Classics
>
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--
As of 1st October 2012, I have retired from the University, so this
disclaimer is redundant....
These are my own views and may or may not be shared by my employer
Dave Malham
Ex-Music Research Centre
Department of Music
The University of York
Heslington
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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