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Date:      Sun, 28 Oct 2001 01:41:45 +0930 (CST)
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        Bjarne Wichmann Petersen <mekanix@privat.dk>
Cc:        freebsd-multimedia@freebsd.org, Willem van Engen <wvengen@stack.nl>
Subject:   Re: hw.snd.pcm0.vchans
Message-ID:  <XFMail.20011028014144.doconnor@gsoft.com.au>
In-Reply-To: <20011027155446.PSZK22989.fepB.post.tele.dk@there>

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On 27-Oct-2001 Bjarne Wichmann Petersen wrote:
> > rates I tried gave no problem. Even a samplerate of 65535 works when also
> > playing an 44kHz mp3.
>  
>  The sound doesn't sound distorted more like some added noise. Like some weak
>  EM-field (engine etc.) can distort an analoge EM-signal (TV, radio etc.).

I am fairly sure it's just the sample rate converter generating noise..

See here ->
http://www.vlsi.fi/other/VS_SRC/SampleRateTutorial.html

> > Just a guess: maybe your system load is too high to do it smoothly?
>  Perhaps, though the CPU-load isn't above 70%. Perhaps some priority-issue?

I think the converter runs at a _very_ (like interrupt) priority.

---
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum

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