File 0008-amixer-alsamixer-Add-description-of-volume-mapping.patch of Package alsa-utils
From 8824d0824d780d0fa503f9c9fbae46e45bbb18e7 Mon Sep 17 00:00:00 2001 From: Takashi Iwai <tiwai@suse.de> Date: Mon, 19 Mar 2012 16:03:33 +0100 Subject: [PATCH 08/13] amixer, alsamixer: Add description of volume-mapping Signed-off-by: Takashi Iwai <tiwai@suse.de> --- alsamixer/alsamixer.1 | 13 +++++++++++++ amixer/amixer.1 | 17 +++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/alsamixer/alsamixer.1 b/alsamixer/alsamixer.1 index cd88404..8d34680 100644 --- a/alsamixer/alsamixer.1 +++ b/alsamixer/alsamixer.1 @@ -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), diff --git a/amixer/amixer.1 b/amixer/amixer.1 index b1ac323..3ed20a9 100644 --- a/amixer/amixer.1 +++ b/amixer/amixer.1 @@ -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>. -- 1.7.9.2
