41ff287e07
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21547 a1c6a512-1295-4272-9138-f99709370657
194 lines
8.1 KiB
TeX
194 lines
8.1 KiB
TeX
\subsection{Split Editor}
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When recording an mp3 file, it is common practice to start the recording
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a little bit early and stop it a little bit late to ensure all the
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desired sound is recorded. This results in recordings that contain
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extra snippets of sound in the beginning and the end. Unfortunately these
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snippets can not be deleted easily because they are stored in the same
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file as the desired recording. The purpose of the split editor is to
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split an mp3 file (the input file) at a point in time (split point). Two
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new files can be generated from the input file. The first file contains
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the part before the split point and the second file contains the part
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after the split point. Once this process has been successful the
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original file can be deleted or kept as a backup. %
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%
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The whole process of splitting an mp3 file consists of three steps:
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%
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\begin{itemize}
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\item Defining the split point
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\item Generating the result files
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\item If desired deleting the input file (with the browser, not the split editor)
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\end{itemize}
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\subsubsection{How To Use The Split Editor}
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When the device plays the song just hit the \ActionWpsPlay{} button
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to pause, when playback has roughly reached the split point. This need
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not be very precise as the split point can be fine tuned later. A screen
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similar to the one below will appear.
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\begin{figure}[H]
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\begin{center}
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\includegraphics[width=8.0cm]{plugins/images/ss-splitedit-main-112x64x1}
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\caption{The Split Editor's Main Screen}
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\end{center}
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\end{figure}
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\subsubsection{The Split Editor's Main Screen}
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\begin{description}
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\item[The waveform]
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displays the volume of the song over time. It will appear as the song
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plays and help to visually identify the point in time where the split is
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desired
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%
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\item[The split point indicator]
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is a vertical line with a small triangle at the top end. It is the most
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important control element of the split editor. It can be moved with the
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\ButtonLeft\ and \ButtonRight\ buttons. Later, when you have fine tuned
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the split point, the song will be split at this position.
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%
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\item[The split time]
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At the top of the window a time value is displayed. This is the point in
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time within the song at which the split point indicator is positioned.
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%
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\item[The locator]
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Another vertical bar represents the position locator. It moves along as
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the song plays. In contrast to the split point indicator it has no
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triangles at the ends.
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%
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\item[The time bar]
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displays the current position within the song relative to the whole song.
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The entire length of the time bar represents the song length. The length
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of the solid part of the time bar represents the position and length of
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the displayed part of the song.
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%
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\item[The scale mode]
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On the right side of the bottom line the scale mode is displayed. The
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waveform can be scaled either logarithmically or linearly. In logarithmic
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scale mode the letters ``dB'' are displayed, in linear mode ``\%''. Use
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\opt{RECORDER_PAD}{\ButtonFThree}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonRight}
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to switch between these modes. Linear mode usually gives better optical
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hints with commercially recorded music. For quiet recordings,
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especially of human speech, the logarithmic scale often is preferable.
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More information in the Scale \reference{ref:Scalemode} below.
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%
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\item[The loop mode]
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In the middle of the bottom line the loop mode icon is displayed.
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There are 4 different loop modes. Pressing
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\opt{RECORDER_PAD}{\ButtonFTwo}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonUp}
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changes to the next loop mode.
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%
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\begin{description}
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\item
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\includegraphics[width=0.53cm]{plugins/images/icon-splitedit-loop-1}
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Playback loops around the split point indicator. This mode is best
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used when searching and zooming for the desired point at which to split
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the recording.
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\item
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\includegraphics[width=0.53cm]{plugins/images/icon-splitedit-loop-2}
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Playback loops from the split point indicator to the end of the
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visible area. This mode is best used when fine tuning the split
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indicator position at the beginning of a recording.
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\item
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\includegraphics[width=0.53cm]{plugins/images/icon-splitedit-loop-3}
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Playback loops from the beginning of the
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visible area to the split point. This mode is best used when fine
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tuning the split indicator position at the end of a recording.
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\item
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\includegraphics[width=0.53cm]{plugins/images/icon-splitedit-loop-4}
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Playback does not loop, the borders of the visible
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area as well as the split point indicator are ignored. This mode is
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best used when playing the song outside of the borders of the displayed
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region.
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\end{description}
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\item[Perform the split (8)]
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The icon above the
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\opt{RECORDER_PAD}{\ButtonFOne}
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\opt{ONDIO_PAD}{\ButtonLeft}
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button indicates its function to execute the split. When split
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positioning is complete open the save dialogue with
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\opt{RECORDER_PAD}{\ButtonFOne}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonLeft}.
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\end{description}
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\begin{table}
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\begin{btnmap}{Controls in the split editor}{}
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\ButtonOff \opt{IRIVER_RC_H100_PAD}{&} & Quit plugin \\
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%
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\ButtonLeft\ / \ButtonRight \opt{IRIVER_RC_H100_PAD}{&} & Move the split point indicator \\
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%
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\ButtonUp\ / \ButtonDown \opt{IRIVER_RC_H100_PAD}{&} & Zoom in / out \\
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%
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\opt{RECORDER_PAD}{\ButtonPlay}
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\opt{ONDIO_PAD}{\ButtonMenu}
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& Play from the split position \\
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%
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\opt{RECORDER_PAD}{\ButtonFOne}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonLeft}
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& Enter the save dialogue \\
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%
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\opt{RECORDER_PAD}{\ButtonFTwo}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonUp}
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& Toggle loop modes \\
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%
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\opt{RECORDER_PAD}{\ButtonFThree}
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\opt{ONDIO_PAD}{\ButtonMenu\ + \ButtonRight}
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& Toggle logarithmic / linear scaling \\
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\opt{RECORDER_PAD}{
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%
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\ButtonOn\ + \ButtonLeft
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\opt{IRIVER_RC_H100_PAD}{&}
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& Play half speed \\
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%
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\ButtonOn\ + \ButtonRight
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\opt{IRIVER_RC_H100_PAD}{&}
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& Play 150\% speed \\
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%
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\ButtonOn\ + \ButtonPlay
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\opt{IRIVER_RC_H100_PAD}{&}
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& Play normal speed \\
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}
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\end{btnmap}
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\end{table}
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\subsubsection{Save dialogue}
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In the save dialogue it is possible to specify which of the files you
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want to save and their names. When finished, select
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``Save'' and the files will be written to
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disk. Note that files can not be overwritten, so filenames that
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do not exist yet must be chosen. If unsure whether the
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file already exists simply try to save it. If another file with this
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name exists the dialogue will return and you can choose another
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filename
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\screenshot{plugins/images/ss-splitedit-save}{The Split Editor's
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Save Dialogue}{}
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\begin{table}
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\begin{btnmap}{Controls in the save dialogue}{}
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\ButtonUp\ / \ButtonDown \opt{IRIVER_RC_H100_PAD}{&} & Select item \\
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%
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\opt{RECORDER_PAD}{\ButtonPlay}
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\opt{ONDIO_PAD}{\ButtonRight}
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& Toggle / edit item \\
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%
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\ButtonOff \opt{IRIVER_RC_H100_PAD}{&} & Cancel \\
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\end{btnmap}
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\end{table}
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\subsubsection{\label{ref:Scalemode}Scale}
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The values in the waveform are scaled according to the settings of the
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peak meter. These can be altered in the peak meter settings,
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see \reference{ref:Peakmetersetting}. If extreme minimum or
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maximum values are set the waveform might be cut off. A minimum
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setting of {}-60 dB and a maximum setting of 0 dB are recommended.
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These settings should be capable of producing useful waveforms for very
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soft sounds in logarithmic mode (dB). When the editor is used on loud
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sounds (such as commercial rock or pop music) switching to the linear
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scale may prove more effective since the logarithmic scale compresses
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loud noises and makes it more difficult to identify characteristic
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shapes. Note that it is always possible to toggle between the two scale
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modes.
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