In message <[EMAIL PROTECTED]>, Nick Atty <[EMAIL PROTECTED]> writes >On Tue, 25 Sep 2007 19:31:00 +0100, Ron Jones wrote: > >>Martin Phillips wrote: >>> 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? >> >>Could we be a little more specific? What's RIAA - are your referring to >>Macrovision in DVDs? - > >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.
Nick you are right, I'm showing my age. I was thinking of trying to transfer my LP collection to digital format. I would use a pre-amp with RIAA de-emphasis, but don't have one (that is still working). >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. Yes, the Audacity software that Les suggested has shaping capability - I was being lazy and hoping that someone could recommend a package that has it implemented without further thought being required! (Both stingy and lazy). Actually, I have found a sort of beta tested programme which might do the job. Will give it a whizz over the weekend if time permits. Wassail! -- Martin E Phillips http://www.g4cio.demon.co.uk Homebrewing, black pudding, boats, morris dancing, ham radio and more! The Gloucester-Sharpness canal web page http://www.glos-sharpness.org.uk
