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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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Michael DiFebbo 2006-10-14 15:27:17 +00:00
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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
equalizer lets you control several different parameters for each band of the
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
frequencies below the designated cutoff point. The ``bass''control on
most home or car stereos is an example of a low shelf filter. The low shelf
filter in Rockbox is more flexible than a simple ``bass'' control, because
a simple bass control only lets you adjust the amount of gain that is
applied. Rockbox lets you control the amount of gain that is applied
(i.e., the amount that the bass is boosted or cut) too, but Rockbox also
allows you to adjust the ``cutoff'' frequency where the shelving starts
to take effect. For example, a cutoff frequency of 50 Hz will adjust only
very low frequencies. A cutoff frequency of 200 Hz, on the other hand,
will adjust a much wider range of bass frequencies.
\item[Bands 1-3: Peaking filters.]
Peaking EQ filters boost or low a center frequency that you select, as
well as the frequencies within a certain distance of that center. Graphic
equalizers in home stereos are usually peaking filters. The peaking EQs
on Rockbox's parametric equalizer let you adjust three different
parameters for each EQ band 1 through 3. The ``center'' parameter
controls the center frequency that is adjusted by that EQ band. The
``gain'' parameter controls how much each band is adjusted. Positive
numbers make the EQ band louder, while negative numbers make that EQ band
quieter. Finally, the ``Q'' parameter controls how wide 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.
\item[Band 4: High 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.
\end{description}
\begin{table}
\begin{center}
\begin{tabularx}{\textwidth}{lX}\toprule
\textbf{EQ Band(s)} & \textbf{Description} \\\midrule
Band 0: Low shelf filter
& A low shelf filter boosts or lowers all frequencies below the
designated cutoff point. The ``bass''control on most home or car
stereos is an example of a low shelf filter. The low shelf
filter in Rockbox is more flexible than a simple ``bass''
control, because a simple bass control only lets you adjust
the amount of gain that is applied. Rockbox lets you control
the amount of gain that is applied (i.e., the amount that the
bass is boosted or cut) too, but Rockbox also allows you to
adjust the ``cutoff'' frequency where the shelving starts to take
effect. For example, a cutoff frequency of 50 Hz will adjust only very
low frequencies. A cutoff frequency of 200 Hz, on the other hand, will
adjust a much wider range of bass frequencies.. \\
%
Bands 1-3: Peaking filters
& Peaking EQ filters boost or low a center frequency that you select,
as well as the frequencies within a certain distance of that
center. Graphic equalizers in home stereos are usually peaking
filters. The peaking EQs on Rockbox's parametric equalizer let
you adjust three different parameters for each EQ band 1
through 3. The ``center'' parameter controls the center
frequency that is adjusted by that EQ band. The ``gain''
parameter controls how much each band is adjusted. Positive
numbers make the EQ band louder, while negative numbers make
that EQ band quieter. Finally, the ``Q'' parameter controls how wide
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
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.
\fixme{This information is not yet added}
\begin {description}
\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.}
}