Please change the topic tag from [pic]: to [ee]: or [ot]: when posting information or questions that do not have anything to do with PICs. Thank you. --- James Newton (PICList Admin #3) mailto:jamesnewton@piclist.com 1-619-652-0593 PIC/PICList FAQ: http://www.piclist.com or .org -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of WytRaven Sent: Tuesday, October 31, 2000 16:18 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [PIC]: Muso's of the world unite! ;) Thanks for the very informative post. I'm still a little unclear on the this though: >You'd never burn a 16\44.1 master to a CD, you always downsample first. So >that the effect that moves a 45kHz signal down to 38kHz has something to >work on. Could I trouble you to expand on this? WytRaven http://wytraven.8k.com/ At 12:29 PM 31/10/00 +1100, you wrote: >In general I'd suggest you stay away from the whole Analog->Digital >conversion thing. You could do digital only hardware effects (buy an SB Live >value and you've got the SPDIF I\O you'd need too). It's a fairly tricky >thing to do it right. Certainly I'd forget 24bit or 96kHz for a whole range >of reasons including: >1) Good luck ever getting 24\96. As an example, Creative don't make >especially good soundcards but they still have access to proper technology >(i.e. multilayer PCB's, proper Audio design engineer's (if not the best), >sophisticated EMI reduction software) and one of they're "16-bit" soundcards >can only achieve 13-bits dynamic range. Why cause it's REAL hard and REAL >expensive to design even a 16\48 soundcard let alone 24-96. > >2) You're not leaving any DSP headroom. You always have more effects >headroom then master headroom. This is why 20\48kHz is a common format. >You'd never burn a 16\44.1 master to a CD, you always downsample first. So >that the effect that moves a 45kHz signal down to 38kHz has something to >work on. A 20\48 converter is prob. more manageable and well suited to CD >mastering. 24\96 is more for DAT (24\48). You'd need a REAL good ear to >notice the lack of >24kHz artifacts in a 48 compared to a 96 recording. > >3) 24\96 converters alone can easily cost in excess of US$100+. Then you >need to ensure other components like amp will also meet the required specs = >more money. > >If you want to investigate musical effects as people suggested, buy either >an eval kit if you're real set on hardware, or more sensibly use a PC with a >soundcard. Get CSound for a programming style view of it or >Reaktor\Audiomulch for a graphical view of it. Or as suggested write your >own. Easier to master DSP on a 500+MHz system with Floating point ops and >abundent resources then master efficient DSP later. > >If you want high quality audio I\O from your PC and really want to make it >yourself, a USB based digital I\O unit might be more managable. Then all you >need is a fast-ish UART (a scenix could probably handle 1 I\O) and a SPDIF >transciever and reciever. > >BTW: The SB Live is quite a good choice for experimentation. It has the same >DSP chip as the Emu APS and the value version probably less than many DSP >eval kits. There is info at http://come.to/sblive on writing DSP microcode >for it. Unfortunately most support is Linux based as there are Open source >drivers for Linux. > >Tom. > >-----Original Message----- >From: WytRaven [mailto:wytraven@KIK.NET] >Sent: Thursday, October 26, 2000 6:35 PM >To: PICLIST@MITVMA.MIT.EDU >Subject: [PIC]: Muso's of the world unite! ;) > > >Hi guys, > >I am a muso and my primary interest in subscribing to this list is to glean >information about using PIC's in music related experiments. I am an >enthusiast not an engineer and would like to apologize in advance for >asking stupid questions occasionally. >After noting the interest that the MIDI keyboard question has raised I >would like to request that those of you out there who are musicians post >some info on the viable use of PIC's in music. Personally I would like to >know if the PIC in any of it's many forms is suitable for sampling and >processing 24Bit/96KHz Audio. >Is it possible to use twin 12Bit ADC's to sample a signal, one sampling the >+ve part and one the -ve part? >After zero response to my first post asking about audio sampling with PIC's >I did some research...yes, OK, so I should have done that first...From what >I could find, there is no single PIC that can handle this kind of through >put but there's nothing stopping me from using 2 or three is there? > >WytRaven > >http://wytraven.8k.com/ > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.