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Subject: Re: Iriver: 48kHz Ogg turns on radio?

Re: Iriver: 48kHz Ogg turns on radio?

From: Sascha Lüdecke <>
Date: Wed, 13 Jul 2005 22:54:55 +0200

On Sun, 10 Jul 2005 22:30:34 +0200 (MEST),
Magnus Holmgren <> writes:

>> I can confirm that problem. Playing oggs with 32kHz has the noises at
>> least since daily 20050703 (and still has them with the bleeding
>> 2005-07-09 08:12).
> I've been working on the code responsible for the resampling (in dsp.c),
> and I must say I'm not entirely surprised. When I looked at how Vorbis
> samples were processed (as compared to MP3), I was worried that some
> calculations might overflow. Maybe that's what you're hearing?

The distortions I hear sound very regular. That is all I can tell.

> And no, I don't have any code ready for test now, though making a quick
> test for this would be quite easy actually. Anyone inclined could change
> dsp.c to shift left 15 rather than 16 bits (and adjust min/max/fracbits
> values appropriately). :) Maybe I'll run some tests tomorrow...

Glad to hear someone is taking care of the problem. I will stop
whining about resampling.

Moxon AKA Sascha

As easy as 3.14159265358979323846264338327950288419716


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Received on 2005-07-13

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