[LAD] Calibrating sound cards
rlrevell at joe-job.com
Mon Apr 14 21:17:39 UTC 2008
On Mon, Apr 14, 2008 at 5:15 PM, James Courtier-Dutton
<James at superbug.co.uk> wrote:
> Is there a recognized method for calibrating a sound card?
> For Playback, one sends a sample .wav PCM file to the sound card, then
> measure the analog output from the line-out.
> If the sound card itself provides 0dB of Gain, what should be the
> measured figure?
> Can this be done with a simple AC volt meter?
> There seems to be some debate, with regards to ALSA, as to whether the
> line-out is at the correct level if one sets all the ALSA mixer controls
> to 0dB.
Wouldn't this require developer access to every single device we
support? With HDA intel this would mean every make and model of
laptop and motherboard on the market.
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