Re:

Mike,

It's done in the MPEG decoder. There's a volume matrix which lets us set
balance and levels going out to the DAC. It also has bass/treble controls,
but we're not using those currently.

Regardless of whether the volume control is being done after the DAC or
before, it's always best to run your sources at full volume, and do the
volume control in your receiver.  This is true of any source, CD, DAT, VCR
whatever. The higher the output level, the better the s/n ratio you get.

We include volume control in the SliMP3 as a convenience to those using
amplified speakers w/o remote control, but it's not the best way to go if
you have a receiver.

Sean

On Sat, 9 Feb 2002, Michael Robin wrote:

> Sorry, I don't know alot about mp3 decompressors,
> so I hope this isn't a silly question...
>
> How is the volume control accomplished on the slimp3?
>
> The no-holes-barred method is usually to do volume control in the analog
> domain so that music quality is not sacrificed at lower volumes due to lose
> of the LSB's - but I assume this is not done on the slmp3, so it must be
> done in the digital domain by the decompressor firmware. How much quality is
> lost at lower volumes?
> Is there magic done by the decompressor for the psycho-acoustic effects of
> lower volumes or anything else funky going on, or is it pretty much dividing
> out the DAC value?
> The basic question is, should I forego the convienience of volume control
> from the slimp3 itself and run full-range into my equiptment and adjust the
> volume from there, or do you think Mp3 is already lossy enough to not
> bother? (Yes, I need to do my own listening test - but I'd also like to know
> how it works.)
>
> thanks,
> mike
>
>
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