summaryrefslogtreecommitdiffstats
path: root/manual/configure_rockbox/sound_settings.tex
diff options
context:
space:
mode:
authorMichael Giacomelli <giac2000@hotmail.com>2014-06-20 20:34:49 +0200
committerMichael Giacomelli <giac2000@hotmail.com>2014-06-20 20:34:49 +0200
commit8e55bd1f9fa4481156ac6e093376c0aba7b30187 (patch)
tree98af39931eea7d7d073afa54bdeb62182250f1d4 /manual/configure_rockbox/sound_settings.tex
parentb66fe786bccb0af34af1f31690e09400df4d8fb1 (diff)
downloadrockbox-8e55bd1f9fa4481156ac6e093376c0aba7b30187.tar.gz
rockbox-8e55bd1f9fa4481156ac6e093376c0aba7b30187.tar.bz2
rockbox-8e55bd1f9fa4481156ac6e093376c0aba7b30187.zip
Add Q factor graphic to EQ settins in the manual.
Change-Id: I77a36537e7e9c82c8ecf351205de6c8178140794
Diffstat (limited to 'manual/configure_rockbox/sound_settings.tex')
-rw-r--r--manual/configure_rockbox/sound_settings.tex29
1 files changed, 22 insertions, 7 deletions
diff --git a/manual/configure_rockbox/sound_settings.tex b/manual/configure_rockbox/sound_settings.tex
index 7022315c83..1bfbb2311a 100644
--- a/manual/configure_rockbox/sound_settings.tex
+++ b/manual/configure_rockbox/sound_settings.tex
@@ -333,13 +333,28 @@ change to customise your listening experience.
\opt{swcodec}{
\section{\label{ref:EQ}Equalizer}
\screenshot{configure_rockbox/images/ss-equalizer}{The graphical equalizer}{}
- Rockbox features a parametric equalizer (EQ). As the name suggests, a
- parametric EQ lets you control several different parameters for each
- band of the EQ. \nopt{gigabeats}{In some ways the EQ is similar to the
+ Rockbox features a parametric equalizer (EQ). In contrast to non-parametric
+ equalizers, a parametric EQ enables adjusting the center frequency, gain, and
+ width of EQ bands separately. The ability to adjust the frequency and width
+ of bands enables more precise control of the EQ frequency response while
+ avoiding the use of a large number of bands (often 12+) needed in a
+ non-parametric EQ.
+
+ The graphic below illustrates how the width of 10kHz band can be adjusted to
+ cover a wider (lower Q) or narrower (higher Q) range of frequencies.
+
+ \includegraphics[width=14cm]{configure_rockbox/images/Q_factor.png}
+
+ \nopt{gigabeats}{In some ways the EQ is similar to the
\setting{Bass} and \setting{Treble} settings described earlier, but the EQ
- allows you to control the sound much more carefully.} \opt{gigabeats}{The EQ
- is similar to the \setting{Tone Controls} described above, but allows more
- delicate control.}\\
+ allows you to control the sound much more carefully. Note that the parameteric
+ EQ bands will be applied in addition to any bass or treble tone controls.
+ } \opt{gigabeats}{The EQ is similar to the \setting{Tone Controls} described
+ above, but allows more delicate control.}\\
+
+ \note{A maximum of 10 EQ bands are possible on most devices, but using more
+ than are required will waste battery and introduce additional rounding
+ noise. For best results, use the fewest number of bands required.}
Rockbox's parametric EQ is composed of five different bands:
\begin{description}
@@ -362,7 +377,7 @@ change to customise your listening experience.
centre frequency chosen.
Graphic equalizers in home stereos are usually peaking
filters. The peaking filters in Rockbox's EQ lets you adjust three
- different parameters for EQ bands 1 through 3. The ``centre'' parameter
+ different parameters for EQ bands 1 through 8. The ``centre'' parameter
controls the centre frequency of the frequency range that is affected
as described above.
The ``gain'' parameter controls how much each band is adjusted, and