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Subject: Re: wireless audio link. hiss problems on songs.. via archos/rockbox 2.2
From: Mat Holton (mathew.holton_at_surface-inspection.com)
Date: 2004-03-19


What Audio Plugin?
-----Original Message-----From: BlueChip <cs_bluechip_at_webtribe.net>To: Rockbox development <rockbox_at_cool.haxx.se>Sent: 19/03/2004 14:33Subject: Re: wireless audio link. hiss problems on songs.. via archos/rockbox 2.2>>Hmm, I was pretty sure that 93 is 0dB...

>

>0x7f * 92 / 100 = 0x73 == 0dB

>

>0x7f * 93 / 100 = 0x76 == +3dB

>

>(we should really move from % to dB for the volume control)

>

>Linus

In my audio plugin I used a moving scale (I actually did this for several

of the controls).

This is taken from the advanced audio docs:

"NOTE: The percentage (%) scale is NOT a true linear scale. For values 1

.. 69 a linear scale is used to achieve a value in the range -114dB ...

-19dB. Values above 69 represent 1dB steps from -18dB ... +12dB. This

allows for more user-readable scale, while maintaining greater control and

accuracy at higher volumes."

If you want the algorithms, feel free to ask.

BC

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