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Add Q factor graphic to EQ settins in the manual.

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Change-Id: I77a36537e7e9c82c8ecf351205de6c8178140794
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Michael Giacomelli 2014-06-20 20:34:49 +02:00
parent b66fe786bc
commit 8e55bd1f9f
2 changed files with 22 additions and 7 deletions
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manual/configure_rockbox/sound_settings.tex
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@ -333,13 +333,28 @@ change to customise your listening experience.
\opt{swcodec}{ \opt{swcodec}{
\section{\label{ref:EQ}Equalizer} \section{\label{ref:EQ}Equalizer}
\screenshot{configure_rockbox/images/ss-equalizer}{The graphical equalizer}{} \screenshot{configure_rockbox/images/ss-equalizer}{The graphical equalizer}{}
Rockbox features a parametric equalizer (EQ). As the name suggests, a Rockbox features a parametric equalizer (EQ). In contrast to non-parametric
parametric EQ lets you control several different parameters for each equalizers, a parametric EQ enables adjusting the center frequency, gain, and
band of the EQ. \nopt{gigabeats}{In some ways the EQ is similar to the 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 \setting{Bass} and \setting{Treble} settings described earlier, but the EQ
allows you to control the sound much more carefully.} \opt{gigabeats}{The EQ allows you to control the sound much more carefully. Note that the parameteric
is similar to the \setting{Tone Controls} described above, but allows more EQ bands will be applied in addition to any bass or treble tone controls.
delicate control.}\\ } \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: Rockbox's parametric EQ is composed of five different bands:
\begin{description} \begin{description}
@ -362,7 +377,7 @@ change to customise your listening experience.
centre frequency chosen. centre frequency chosen.
Graphic equalizers in home stereos are usually peaking Graphic equalizers in home stereos are usually peaking
filters. The peaking filters in Rockbox's EQ lets you adjust three 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 controls the centre frequency of the frequency range that is affected
as described above. as described above.
The ``gain'' parameter controls how much each band is adjusted, and The ``gain'' parameter controls how much each band is adjusted, and