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Fix a small typo, add FIXME's for sansa and h10 and clean some whitespace

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12147 a1c6a512-1295-4272-9138-f99709370657
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Nils Wallménius 2007-01-29 17:03:56 +00:00
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185
manual/configure_rockbox/sound_settings.tex
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@ -5,12 +5,13 @@ The Sound Settings menu offers a selection of sound properties you may
change to customise your listening experience.
\section{Volume}
This setting adjusts the volume of your music. Like most professional
audio gear and many consumer audio products, Rockbox uses a decibel scale
This setting adjusts the volume of your music. Like most professional
audio gear and many consumer audio products, Rockbox uses a decibel scale
where 0 dB is a reference that indicates the maximum volume that the \dap{}
can produce without possible distortion (clipping). All values lower than
this reference will be negative and yield a progressively softer volume.
\opt{player, recorder, recorderv2fm, ondio, ipodnano, ipodvideo}{
can produce without possible distortion (clipping). All values lower than
this reference will be negative and yield a progressively softer volume.
\opt{player, recorder, recorderv2fm, ondio, ipodnano, ipodvideo, x5, h10,
h10_5gb, sansa}{
Values higher than 0 dB are available and can be used to raise the
volume more than would otherwise be possible. These volume levels will
ordinarily lead to distorted sound, but might work nicely for music that has
@ -24,23 +25,23 @@ change to customise your listening experience.
\opt{x5}{minimum of -73 dB to a maximum of +6 dB.}
\opt{ipodcolor}{minimum of -\fixme{??} dB to a maximum of +\fixme{??} dB.}
\opt{h10,h10_5gb,sansa}{minimum of -74 dB to a maximum of +6 db.}
\section{Bass}
\opt{player,recorder,recorderv2fm,ondio}{This emphasises or suppresses the
lower (bass) sounds in the track. 0 means that bass sounds are unaltered
\opt{player,recorder,recorderv2fm,ondio}{This emphasises or suppresses the
lower (bass) sounds in the track. 0 means that bass sounds are unaltered
(flat response).}
\opt{h1xx,h300}{The bass setting can be used to increase (but not decrease)
frequencies below 300Hz. Bass boost can be set from 0 to 24 dB in
increments of 2 dB. A setting of 0 means that low frequencies are unaltered
increments of 2 dB. A setting of 0 means that low frequencies are unaltered
(flat response).}
\opt{ipodnano,ipodcolor,ipodvideo}{This emphasises or suppresses the
lower (bass) sounds in the track. 0dB means that bass in unaltered
(flat response). The minimum setting is -6dB and the maximum is 9dB.}
\opt{x5,sansa}{\fixme{add platform specific information here}}
\opt{x5,sansa,h10,h10_5gb}{\fixme{add platform specific information here}}
\section{Treble}
\opt{player,recorder,recorderv2fm,ondio}{This emphasises or suppresses the
higher (treble) sounds in the track. 0 means that treble sounds are
higher (treble) sounds in the track. 0 means that treble sounds are
unaltered (flat response).}
\opt{h1xx,h300}{The Treble setting can be used to increase (but not decrease)
frequencies above 1.5kHz. Treble boost can be set from 0 to 6 dB in
@ -49,17 +50,17 @@ change to customise your listening experience.
\opt{ipodnano,ipodcolor,ipodvideo}{This setting emphasises or suppresses
the higher (treble) sounds in the track. 0dB means that treble is unaltered
(flat response). The minimum setting -6dB and the maximum is 9dB.}
\opt{x5,sansa}{\fixme{add platform specific information here}}
\opt{x5,sansa,h10,h10_5gb}{\fixme{add platform specific information here}}
\section{Balance}
This setting controls the balance between the left and right channels. The
default, 0, means that the left and right outputs are equal in volume.
This setting controls the balance between the left and right channels. The
default, 0, means that the left and right outputs are equal in volume.
Negative numbers increase the volume of the left channel relative to the
right, positive numbers increase the volume of the right channel relative
to the left.
\section{Channels}
A stereo audio signal consists of two channels, left and right. The
A stereo audio signal consists of two channels, left and right. The
\setting{Channels} setting controls if these channels are to be combined in
any way, and if so, in what manner they will be combined.
Available options are:
@ -95,22 +96,22 @@ change to customise your listening experience.
\end{tabularx}
\end{center}
\end{table}
\section{Stereo Width}
Stereo width allows you to manually specify the effect that is applied
when the \setting{Channels} setting is set to \setting{Custom}.
All values below 100\% will progressively mix the contents of one channel
into the other. This has the effect of gradually centering the stereo image,
All values below 100\% will progressively mix the contents of one channel
into the other. This has the effect of gradually centering the stereo image,
until you have monophonic sound at 0\%. Values above 100\% will progressively
remove components in one channel that is also present in the other. This has
the effect of widening the stereo field. A value of 100\% will leave the
remove components in one channel that is also present in the other. This has
the effect of widening the stereo field. A value of 100\% will leave the
stereo field unaltered.
\opt{recorder,recorderv2fm}{
\section{Loudness}
Loudness is an effect which emphasises bass and treble. This makes the
Loudness is an effect which emphasises bass and treble. This makes the
track seem louder by amplifying the frequencies that the human ear finds
hard to hear. Frequencies in the vocal range are unaffected, since the human
hard to hear. Frequencies in the vocal range are unaffected, since the human
ear picks these up very easily.
}
@ -118,7 +119,7 @@ change to customise your listening experience.
\section{Auto Volume}
Auto volume is a feature that automatically lowers the volume on loud parts,
and then slowly restores the volume to the previous level over a time
interval. That time interval is configurable here. Short values like 20ms
interval. That time interval is configurable here. Short values like 20ms
are useful for ensuring a constant volume for in car use and other
applications where background noise makes a constant loudness desirable.
A longer timeout means that the change in volume back to the previous level
@ -128,57 +129,57 @@ change to customise your listening experience.
\opt{recorder,recorderv2fm}{
\section{Super Bass}
This setting changes the threshold at which bass frequencies are affected by
the \setting{Loudness} setting, making the sound of drums and bass guitar
the \setting{Loudness} setting, making the sound of drums and bass guitar
louder in comparison to the rest of the track. This setting only has an
effect if \setting{Loudness} is set to a value larger than 0dB.
}
\opt{recorder,recorderv2fm}{
\section{MDB {}- Micronas Dynamic Bass}
The rest of the parameters on this menu relate to the Micronas Dynamic
Bass (MDB) function. This is designed to enable the user to hear bass
Bass (MDB) function. This is designed to enable the user to hear bass
notes that the headphones and/or speakers are not capable of reproducing.
Every tone has a fundamental frequency (the ``main tone'') and also several
harmonics, which are related to that tone. The human brain has a mechanism
harmonics, which are related to that tone. The human brain has a mechanism
whereby it can actually infer the presence of bass notes from the higher
harmonics that they would generate.
The practical upshot of this is that MDB produces a more authentic sounding
bass by tricking the brain in believing it's hearing tones that the
headphones or speakers aren't capable of reproducing. Try it and see
headphones or speakers aren't capable of reproducing. Try it and see
what you think.
The MDB parameters are as follows.
%
\begin{description}
\item[MDB enable:]
This turns the MDB feature on or off. For many users this will be the
This turns the MDB feature on or off. For many users this will be the
only setting they need, since Rockbox picks sensible defaults for the
other parameters. MDB is turned off by default.
other parameters. MDB is turned off by default.
\item[MDB strength:]
How loud the harmonics generated by the MDB will be.
\item[MDB Harmonics:]
\item[MDB Harmonics:]
The percentage of the low notes that is converted into harmonics.
If low notes are causing speaker distortion, this can be set to 100\%
to eliminate the fundamental completely and only produce harmonics in the
signal. If set to 0\% this is the same as turning the MDB feature off.
\item[MDB Centre Frequency:]
The cutoff frequency of your headphones or speakers. This is usually
The cutoff frequency of your headphones or speakers. This is usually
given in the specification for the headphones/speakers.
\item[MDB shape:]
It is recommended that this parameter be set to 1.5 times the centre frequency.
This is the frequency up to which harmonics are generated. Some of the
This is the frequency up to which harmonics are generated. Some of the
lower fundamentals near the cut{}-off range will have their lower
harmonics cut off, since they will be below the range of the speakers.
Fundamentals between the cut{}-off frequency and the lower frequency
will have their harmonics proportionally boosted to compensate and restore
the `loudness' of these notes.
For most users, the defaults should provide an improvement in sound
quality and can be safely left as they are. For reference, the defaults
quality and can be safely left as they are. For reference, the defaults
Rockbox uses are:
%
%
\begin{table}[h!]
\begin{center}
\begin{tabular}{@{}lc@{}}\toprule
@ -199,14 +200,14 @@ change to customise your listening experience.
Crossfeed attempts to make the experience of listening to music on
headphones more similar to listening to music with stereo speakers. When you
listen to music through speakers, each ear will hear sound originating from
both speakers. However, the sound from the left speaker reaches your right
both speakers. However, the sound from the left speaker reaches your right
ear slightly later than it does your left ear, and vice versa.
The human ear and brain together are very good at interpreting the timing
differences between direct sounds and reflected sounds and using that
information to identify the direction that the sound is coming from. On the
other hand, when listening to headphones, each ear hears only the stereo
channel corresponding to it. The left ear hears only the left channel and
channel corresponding to it. The left ear hears only the left channel and
the right ear hears only the right channel. The result is that sound from
headphones does not provide the same spatial cues to your ear and brain as
speakers, and might for that reason sound unnatural to some listeners.
@ -216,7 +217,7 @@ change to customise your listening experience.
versa in order to simulate the spatial cues that the ear and brain receive
when listening to a set of loudspeakers placed in front of the listener. The
result is a more natural stereo image that can be especially appreciated in
older rock and jazz records, where one instrument is often hard-panned to
older rock and jazz records, where one instrument is often hard-panned to
just one of the speakers. Many people will find such records tiring to listen
to using earphones and no crossfeed effect.
@ -239,7 +240,7 @@ change to customise your listening experience.
by the amount described by the \setting{High-Frequency Attenuation}
setting.
\end{description}
Most users will find the default settings to yield satisfactory results, but
for the more adventurous user the settings can be fine-tuned to provide a
virtual speaker placement suited to ones preference.
@ -256,58 +257,58 @@ change to customise 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{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.. \\
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
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. \\
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 Q 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
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.
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.
\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
@ -347,32 +348,32 @@ change to customise your listening experience.
& 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.
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
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 sub menu provides options for adjusting the same parameters as the
\setting{Graphical EQ}. The only difference is that the parameters are
This sub menu 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
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}
@ -382,13 +383,13 @@ settings.
\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
\playerman{}. The hardware EQ functions similarly to the Graphical EQ in that
it allows adjustment 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
\note{While the \setting{Hardware EQ} menu shows Low Shelf, three peaking
filters, and High Shelf, the peaking filters are not currently operational.}
}