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First draft of a complete description of the Graphical EQ menu. Still needs button mappings for iAudio and possibly H10. Address FS#5540.

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manual/configure_rockbox/sound_settings.tex
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@ -253,41 +253,132 @@ change to customize your listening experience.
Rockbox features a parametric equalizer. As the name suggests, a parametric Rockbox features a parametric equalizer. As the name suggests, a parametric
equalizer lets you control several different parameters for each band of the equalizer lets you control several different parameters for each band of the
equalizer. Rockbox's parametric EQ is composed of five different EQ bands: equalizer. Rockbox's parametric EQ is composed of five different EQ bands:
\begin{description}
\item[Band 0: Low shelf filter.] A low shelf filter boosts or lowers all \begin{table}
frequencies below the designated cutoff point. The ``bass''control on \begin{center}
most home or car stereos is an example of a low shelf filter. The low shelf \begin{tabularx}{\textwidth}{lX}\toprule
filter in Rockbox is more flexible than a simple ``bass'' control, because \textbf{EQ Band(s)} & \textbf{Description} \\\midrule
a simple bass control only lets you adjust the amount of gain that is Band 0: Low shelf filter
applied. Rockbox lets you control the amount of gain that is applied & A low shelf filter boosts or lowers all frequencies below the
(i.e., the amount that the bass is boosted or cut) too, but Rockbox also designated cutoff point. The ``bass''control on most home or car
allows you to adjust the ``cutoff'' frequency where the shelving starts stereos is an example of a low shelf filter. The low shelf
to take effect. For example, a cutoff frequency of 50 Hz will adjust only filter in Rockbox is more flexible than a simple ``bass''
very low frequencies. A cutoff frequency of 200 Hz, on the other hand, control, because a simple bass control only lets you adjust
will adjust a much wider range of bass frequencies. the amount of gain that is applied. Rockbox lets you control
\item[Bands 1-3: Peaking filters.] the amount of gain that is applied (i.e., the amount that the
Peaking EQ filters boost or low a center frequency that you select, as bass is boosted or cut) too, but Rockbox also allows you to
well as the frequencies within a certain distance of that center. Graphic adjust the ``cutoff'' frequency where the shelving starts to take
equalizers in home stereos are usually peaking filters. The peaking EQs effect. For example, a cutoff frequency of 50 Hz will adjust only very
on Rockbox's parametric equalizer let you adjust three different low frequencies. A cutoff frequency of 200 Hz, on the other hand, will
parameters for each EQ band 1 through 3. The ``center'' parameter adjust a much wider range of bass frequencies.. \\
controls the center frequency that is adjusted by that EQ band. The %
``gain'' parameter controls how much each band is adjusted. Positive Bands 1-3: Peaking filters
numbers make the EQ band louder, while negative numbers make that EQ band & Peaking EQ filters boost or low a center frequency that you select,
quieter. Finally, the ``Q'' parameter controls how wide or narrow each EQ as well as the frequencies within a certain distance of that
band is. Higher Q values will affect a narrow band of frequencies, while center. Graphic equalizers in home stereos are usually peaking
lower EQ values will affect a wider band of frequencies. filters. The peaking EQs on Rockbox's parametric equalizer let
\item[Band 4: High shelf filter.] you adjust three different parameters for each EQ band 1
A high shelf filter boosts or lowers all frequencies above a designated through 3. The ``center'' parameter controls the center
cutoff point. The ``treble'' control on most home or car stereos is an frequency that is adjusted by that EQ band. The ``gain''
example of a high shelf filter. The high shelf filter is adjusted the parameter controls how much each band is adjusted. Positive
same way as the low shelf filter, except that it works on the high end numbers make the EQ band louder, while negative numbers make
of the frequency spectrum rather than the low end. that EQ band quieter. Finally, the ``Q'' parameter controls how wide
\end{description} or narrow each EQ band is. Higher Q values will affect a
narrow band of frequencies, while lower EQ values will affect
a wider band of frequencies. \\
%
Band 4: Hi shelf filter
& A high shelf filter boosts or lowers all frequencies above a
designated cutoff point. The ``treble'' control on most home or car
stereos is an example of a high shelf filter. The high shelf filter is
adjusted the same way as the low shelf filter, except that it works on
the high end of the frequency spectrum rather than the low end.\\
\bottomrule
\end{tabularx}
\end{center}
\end{table}
So, as a general guide, EQ band 0 should be used for lows, EQ bands 1 So, as a general guide, EQ band 0 should be used for lows, EQ bands 1
through 3 should be used for mids, and EQ band 4 should be used for highs. through 3 should be used for mids, and EQ band 4 should be used for highs.
You can find more information about setting the parametric equalizer and
using equalizer presets in the Advanced Topics chapter of this manual. \begin {description}
\fixme{This information is not yet added} \item[Enable EQ:]
This option controls whether the EQ is on or off.
\item[Graphical EQ:]
This option brings up a graphic EQ screen, which allows adjustment of each of
the three parameters described above (gain, center frequency, and Q) for each
of the five EQ bands.
\begin{table}
\begin{btnmap}{}{}
\opt{IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonScrollFwd}
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD}{\ButtonUp}
& Raises the highlighted parameter.\\
%
\opt{IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonScrollBack}
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD}{\ButtonDown}
& Lowers the highlighted parameter.\\
%
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD}{\ButtonLeft}
\opt{IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonLeft}
& Moves to the previous EQ band. \\
%
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD}{\ButtonRight}
\opt{IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonRight}
& Moves to the next EQ band. \\
%
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD}{\ButtonSelect}
\opt{IAUDIO_X5_PAD,IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonSelect}
& Toggles the cursor among the three parameters (gain, center frequency,
Q) for the selected EQ band.\\
%
\opt{IRIVER_H100_PAD,IRIVER_H300_PAD}{\ButtonMode}
\opt{IPOD_4G_PAD,IPOD_3G_PAD,IPOD_VIDEO_PAD}{\ButtonMenu}
& Exits the graphic EQ screen.\\
\end{btnmap}
\end{table}
\item[Pre-cut:]
If too much gain is added through the graphical EQ, your music may distort.
The \setting{Precut} setting allows you to adjust the overall gain of the EQ.
If your music distorts when using the EQ, trying changing this setting to a
negative value.
\item[Simple EQ:]
This option provides an easier alternative for those who are daunted by all of
the parameters that can be adjusted using the graphical EQ. With the
\setting{Simple EQ}, the only parameter that can be adjusted is the gain.
\item[Advanced EQ:]
This submenu provides options for adjusting the same parameters as the
\setting{Graphical EQ}. The only difference is that the parameters are
adjusted through textual menus rather than through a graphic interface.
\item[Save EQ Preset:]
This option saves the current EQ configuration in a \fname{.cfg} file.
\item[Browse EQ Presets:]
This menu displays a list EQ presets, as well as any EQ configurations saved
using the \setting{Save EQ Preset} option. Users unfamiliar with the
operation of a parametric EQ may wish to use the presets instead of trying to
configure the EQ, or use the presets for designing their own custom EQ
settings.
\end{description}
}
\opt{ipodvideo}{
\section{Hardware EQ}
This function controls the EQ that is built into the hardware of your
\playerman{}. The hardware EQ functions similarly to the Graphical EQ in that
it allows adjustmnet of several parameters. However, unlike the Graphical EQ,
the Hardware EQ allows the user to choose from a limited number of settings
for ``Center Frequency'' and ``Bandwidth'' (``Bandwidth'' in the Hardware EQ
is similar to ``Q'' in the Graphical EQ).
\note{While the \setting{Hardware EQ} menu shows Low Shelf, three peaking
filters, and High Shelf, the peaking filters are not currently operational.}
} }