On Tue, 25 Sep 2007 19:31:00 +0100, Ron Jones wrote: >Martin Phillips wrote: >> In message <[EMAIL PROTECTED]>, Les Hunt >> <[EMAIL PROTECTED]> writes >>> --- In [email protected], "Eycott, George, VF UK - >>> Technology \(TS\)" <[EMAIL PROTECTED]> wrote: >>>> >>> >>> However there is a freebie called Audacity that you may like to try - >>> it's available from http://audacity.sourceforge.net/ >> >> At the risk of drifting away from the bank into the uncharted waters >> of off-topic-ness, has anyone got any experience of <stingy> free >> </stingy> recording packages which implement RIAA de-emphasis in >> software? >> >> Wassail! > >Could we be a little more specific? What's RIAA - are your referring to >Macrovision in DVDs? - If so DVDshrink and DVDdecryptor are the ones to >use - they are out there, they take some tracking down as the legal boys >have been getting *very* heavy with the authors, so there's no more upgrades >(not that they are needed!) - one tends to find them on Finnish sites (they >don't break Finnish Laws!). Get back if you can't find them. >Or do you mean DRM in MS terms - that's much harder to break - so for music >files, just burn an *audio* CD, then rip the files off the disc back as >unprotected MP3s (Standard Red Book CDs cannot be protected, so making a >true audio CD has to remove the protection.) > >All the above apply to XP or earlier. Vista is *much* more DRM orientated >(which is why I'm not buying it!)
I think Martin is talking about something much older than that. The pre-emphasis applied to (probably) gramophone disks or (perhaps) magnetic tape and then removed on play-back. It evens things out and - IIRC - provides some very primitive noise reduction. This was in the days when the RIAA produced useful standards to make products better, rather than broke things because they think it's still 1950. I'm surprised, though, that anyone would want to do this in software. I'd expect to do it in a phone pre-amp before the computer got sight of it. They are fairly easy curves though - I'd have thought an old reference book would give them and you could program them into a software filter without much difficulty. As I said, this was when the RIAA used to help you to use their standards, rather than use you to help their bank balance. -- On-line canal route planner: http://www.canalplan.org.uk (Waterways World site of the month, April 2001) My Reply-To address *is* valid, though likely to die soon
