Groups > comp.sys.acorn.programmer > #1341

Re: Sound hardware access for RO

From	Jim Lesurf <jcgl@audiomisc.co.uk>
Subject	Re: Sound hardware access for RO
Newsgroups	comp.sys.acorn.programmer
Date	2012-01-17 12:34 +0000
Message-ID	<5252f7213fjcgl@audiomisc.co.uk> (permalink)
References	(5 earlier) <jeugt8$gh9$1@dont-email.me> <almarsoft.7324079975835647142@news.orange.fr> <52520a9bf5jcgl@audiomisc.co.uk> <4f151393$0$2519$ba4acef3@reader.news.orange.fr> <gUj*hCvXt@news.chiark.greenend.org.uk>
Organization	None

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In article <gUj*hCvXt@news.chiark.greenend.org.uk>,
   Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:
> Rick Murray <heyrickmail-usenet@yahoo.co.uk> wrote:
> > On 15/01/2012 18:30, Jim Lesurf wrote:
> > 
> > > That comes out as a raw data rate of
> > > 96000 x 8 bytes per sec = 768,000 bytes/sec
> > [...]
> > > Now that is a lot of data, but I'm surprised if the USB wasn't able to
> > > cope in *any* RO hardware.
> > 
> > Like I said earlier, a 200MHz ARM is happy writing 2628kbit of video 
> > data to USB in realtime. Actually, I lie. Looking at the flashy light on 
> > the USB stick, it does it in bursts every 8-12 seconds. This meaning if 
> > a 200MHz ARM can burst it, a slower ARM ought to be capable of at least 
> > streaming it...but I don't think this idea is going to be aimed at an 
> > ARM610 RiscPC now, is it? ;-)

> It depends on:
> 1. Software overheads
> 2. Burst size
> 3. Latency
> 4. Caches

With the iso/asynch DACs, the DAC itself takes responsibility for a lot of
the buffering, etc. So some irregularity in the time taken by the host to
respond doesn't matter. It just needs to send all the right data in the
right order, and keep up in the medium to long term with this.

Slainte,

Jim

-- 
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html

Thread

Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-11 12:18 +0000
  Re: Sound hardware access for RO Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-01-11 12:30 +0000
    Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-11 13:43 +0000
      Re: Sound hardware access for RO Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-01-11 22:35 +0000
        Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-12 10:08 +0000
          Re: Sound hardware access for RO Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-01-12 17:57 +0000
            Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-13 12:05 +0000
      Re: Sound hardware access for RO Roger Darlington <rogerarm@freeuk.com> - 2012-04-03 09:03 +0100
        Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-04-03 09:53 +0100
  Re: Sound hardware access for RO John Kortink <kortink@inter.nl.net> - 2012-01-11 14:10 +0100
    Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-11 15:13 +0000
      Re: Sound hardware access for RO Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-01-11 17:04 +0000
      Re: Sound hardware access for RO John Kortink <kortink@inter.nl.net> - 2012-01-11 19:58 +0100
    Re: Sound hardware access for RO "Ste (news)" <steve@revi11.plus.com> - 2012-01-15 17:14 +0000
      Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-17 07:11 +0100
  Re: Sound hardware access for RO druck <news@druck.org.uk> - 2012-01-11 20:52 +0000
    Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-12 09:21 +0000
      Re: Sound hardware access for RO druck <news@druck.org.uk> - 2012-01-14 20:34 +0000
        Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-15 05:19 +0100
          Re: Sound hardware access for RO druck <news@druck.org.uk> - 2012-01-15 12:30 +0000
            Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-15 13:38 +0000
              Re: Sound hardware access for RO druck <news@druck.org.uk> - 2012-01-17 23:38 +0000
                Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-18 09:37 +0000
                Re: Sound hardware access for RO Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-01-27 02:05 +0000
                Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-27 05:19 +0100
            Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-15 15:57 +0100
              Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-15 17:30 +0000
                Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-17 07:22 +0100
                Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-17 09:28 +0000
                Re: Sound hardware access for RO Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-01-17 11:31 +0000
                Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-17 12:34 +0000
            Re: Sound hardware access for RO Dave Higton <davehigton@dsl.pipex.com> - 2012-01-16 21:19 +0000
          Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-15 10:18 +0000
            Re: Sound hardware access for RO Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-01-15 16:18 +0100
              Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-15 17:39 +0000
        Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-15 10:01 +0000
  Re: Sound hardware access for RO Dave Higton <davehigton@dsl.pipex.com> - 2012-01-16 21:28 +0000
    Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-17 09:35 +0000
    Re: Sound hardware access for RO Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-01-17 11:37 +0000
      Re: Sound hardware access for RO davehigton <davehigton14@googlemail.com> - 2012-01-17 05:07 -0800
        Re: Sound hardware access for RO Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-01-17 16:46 +0000
          Re: Sound hardware access for RO Ron <beeb@woosh.co.nz> - 2012-01-18 11:22 +1300
            Re: Sound hardware access for RO Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-01-17 23:42 +0000
              Re: Sound hardware access for RO Ron <beeb@woosh.co.nz> - 2012-01-18 13:47 +1300
      Re: Sound hardware access for RO Jim Lesurf <jcgl@audiomisc.co.uk> - 2012-01-17 12:36 +0000

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