Path: chuka.playstation.co.uk!tjs From: tjs@cs.monash.edu.au (Toby Sargeant) Newsgroups: scea.yaroze.programming.sound Subject: Re: surround Date: 12 May 1999 23:36:12 GMT Organization: PlayStation Net Yaroze (SCEE) Lines: 15 Message-ID: References: <3714CD55.6D04727E@sums.freeserve.co.uk> <371CB2EE.193F83B@playstation.sony.com> <7hc8c7$rfv1@scea> NNTP-Posting-Host: longford.cs.monash.edu.au X-Newsreader: slrn (0.9.4.3 UNIX) On Wed, 12 May 1999 12:05:56 -0400, Lemont Washington wrote: [...] >And FYI, no audio system takes in negative >sound values.... this is not possible.... A negative volume will produce an negated (not bit inverted) copy of the sample. This is exactly what you want for dolby surround. And yes, the playstation does have support for negative volumes, and assuming that the yaroze libraries don't support that, then the only way to do surround sound with a yaroze is with two copies of each dolby-able sample (one being a negated copy of the other). That's kind of painful when you've only got 512k of sample ram (less reverb and mixing workspace), but if you really need dolby surround, then that's really your only choice. Toby.