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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
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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 Please note that you might need to hit \fIESC\fP twice on some terminals
since it's regarded as a prefix key. 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 .SH SEE ALSO
\fB \fB
amixer(1), amixer(1),

17
amixer/amixer.1
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@ -104,10 +104,21 @@ The commands to unmatched ids are ignored without errors too.
.TP .TP
\fI\-h\fP \fI\-h\fP
Help: show syntax. Help: show syntax.
.TP .TP
\fI\-q\fP \fI\-q\fP
Quiet mode. Do not show results of changes. 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 .SH EXAMPLES
.TP .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 \fBamixer \-c 2 cset numid=34 40%\fR
will set the 34th soundcard element to 40% will set the 34th soundcard element to 40%
.SH SEE ALSO
\fB
alsamixer(1)
\fP
.SH BUGS .SH BUGS
None known. None known.
.SH AUTHOR .SH AUTHOR
\fBamixer\fP is by Jaroslav Kysela <perex@perex.cz>. \fBamixer\fP is by Jaroslav Kysela <perex@perex.cz>.
This document is by Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>. This document is by Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>.