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amixer, alsamixer: Add description of volume-mapping

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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Takashi Iwai 2012-03-19 16:03:33 +01:00
parent 658c3cfd57
commit 8824d0824d
2 changed files with 30 additions and 0 deletions
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13
alsamixer/alsamixer.1
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@ -157,6 +157,19 @@ Quit the program with \fIALT Q\fP, or by hitting \fIESC\fP.
Please note that you might need to hit \fIESC\fP twice on some terminals
since it's regarded as a prefix key.
.SH VOLUME MAPPING
In \fBalsamixer\fP, the volume is mapped to a value that is more natural
for a human ear. The mapping is designed so that the position in the
interval is proportional to the volume as a human ear would perceive
it, i.e. the position is the cubic root of the linear sample
multiplication factor. For controls with a small range (24 dB or
less), the mapping is linear in the dB values so that each step has
the same size visually.
Only for controls without dB information, a linear mapping of the
hardware volume register values is used (this is the same algorithm as
used in the old \fBalsamixer\fP).
.SH SEE ALSO
\fB
amixer(1),

17
amixer/amixer.1
View file

@ -104,10 +104,21 @@ The commands to unmatched ids are ignored without errors too.
.TP
\fI\-h\fP
Help: show syntax.
.TP
\fI\-q\fP
Quiet mode. Do not show results of changes.
.TP
\fI\-R\fP
Use the raw value for evaluating the percentage representation.
This is the default mode.
.TP
\fI\-M\fP
Use the mapped volume for evaluating the percentage representation
like \fBalsamixer\fR, to be more natural for human ear.
.SH EXAMPLES
.TP
@ -134,8 +145,14 @@ will set the third soundcard's second line playback volume(s) to 40%
\fBamixer \-c 2 cset numid=34 40%\fR
will set the 34th soundcard element to 40%
.SH SEE ALSO
\fB
alsamixer(1)
\fP
.SH BUGS
None known.
.SH AUTHOR
\fBamixer\fP is by Jaroslav Kysela <perex@perex.cz>.
This document is by Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>.