True, the patent and JAES article are as usual not the full story. The only problem with the second user stuff is whether the thing itself is working properly. Access to a test rig would be useful - never used the 363 but I've had a lot of experience with the earlier 361 unit which uses the CAT 22 Dolby A card. We had the full test rig that you interposed between the card and the main body of the 361. I found it essential to run each card through test at least a couple of times a year - not that there were a lot of faults, but there were some and with the devices being thirty years old..... Dolby ran a wonderful service where you phoned up, told them you had a faulty card and they would ship you a replacement without waiting for your one to arrive back with them and at no cost to you apart from post. Even in York this meant that the most you were without a channel was 24 hours - I can remember cycling to York Railway Station to pick up units direct off the train! In London the turn round was a couple of hours and the courier would take the faulty unit back so not even the cost of return postage (or rail freight). Amazing trust and service, wonder if anyone does that for anything these days!
One possibility would be to use Spice to model the circuit and just process the sound files through the model. Slower than a directly written program, but probably usable for archival work. Dave On 30 April 2013 08:55, Eric Benjamin <eb...@pacbell.net> wrote: > On 30 Apr 2013, at 04:56, David Pickett wrote: > > > A standalone Windows app that would decode Dolby-A encoded wavefiles and > output > >a restored non-Dolby 24-bit wavefile would be most useful. I have several > >recordings that I have had transfer to hi-res files still in Dolby-A > format. > > ... even if such a program were command line only and needed to be left > >overnight to cook! > > Being a fan of doing things the easy way, I'd recommend just buying a Dolby > Model 363 NR unit which does both A type and SR. At any point in time > there are > typically a dozen or so available on Ebay for prices in the range of $150 > to > $300. It's difficult to model something like Dolby NR in DSP because the > algorithm is defined by a circuit. You would need to very carefully > benchmark a > working decoder in any case because neither the patent or the JAES article > really tell you how to do it. > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -- 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' -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130430/bd677040/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound