acoustic labs audio editor
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The following information explains how to navigate throughout the audio waveform, highlight sections of the waveform, zoom in and out and also set markers in key positions of the waveform to help facilitate editing.

Topics
  • Navigating Within the Audio Waveform
  • Highlighting a Waveform Section
  • Zooming In and Out of the Waveform
  • Using Markers




  • Navigating Within the Audio Waveform Audio Editor Tracking Bar

    The tracking bar displayed within the audio file's waveform is a thin highlighted line as shown in the image to the right. The tracking bar is used as the current playback position and the current recording position for audio. The "Start" value located in the lower left hand corner (visual aid item #22) of the Acoustic Labs Audio Editor displays the current position of the tracking bar in minutes and seconds. The tracking bar can be set to a different position within the waveform at anytime simply by left clicking the mouse on any point of the waveform. After doing so, you will immediately see the tracking bar change position and the "Start" value updated. You can also quickly set the tracking bar to the beginning or the end of the audio file by pressing the fast forward or rewind buttons located on the lower toolbar (visual aid item #27 and #28).



    Highlighting a Waveform Section Audio Editor Highlighting

    Another very valuable use that the tracking bar has is it's ability to highlight sections of the audio waveform. When editing or zooming in on particular sections of audio, the ability to highlight or select sections of the waveform is very helpful. To select a section of audio, click the left mouse button down while the mouse arrow is over the waveform and hold the button down while dragging the mouse. As soon as you start to drag the mouse you'll see a section of the audio become highlighted. When you're done selecting the desired section, release the left mouse button. The section of audio will remain highlighted. You can now zoom in on that section of audio or perform specific editing functions as described in Section 4, Section 5 and Section 6 of this Tutorial.

    The included images show an example of selecting audio. Notice that in the first image, when the left mouse button is initially pressed the tracking bar is set and the "Start" time is set to this position (00:00.458). Also notice that in the second image as the waveform is highlighted the "End" and "Total Length" values are updated. Whenever a section of audio is highlighted the "Start" time value will contain the starting position of the highlighted section, the "End" time value will contain the ending position of the highlighted section and the "Total Length" value will contain the length of the highlighted section. When no section of the waveform is highlighted and only the tracking bar exists the "Start" and "End" values will both contain the position of the tracking bar and the "Total Length" value will contain the entire length of the audio data.



    Zooming In/Out of a Waveform

    To view and edit very specific parts of the waveform the zoom feature can be used. The zoom in and zoom out buttons are located in the lower right hand corner of the audio waveform window (visual aid items #17, #18 and #19). After highlighting a section of audio, use the "+" button to zoom in (magnify) the specific section of audio. If you would like to view more of the waveform, click the "-" button. To view the entire waveform, click the button labeled with two joining arrows, one pointing left and the other right.

    Note that you can also use the scroll wheel of your mouse to zoom in and out. Using "Ctrl +" and "Ctrl -" on the keyboard is also a shortcut to zooming. The zoom feature is very powerful, if you wish, you can zoom down to a single sample - a fraction of a millisecond.



    Using Markers Audio Editor Markers

    Markers can be very useful when you need to select a very precise section of audio. Two markers can be set - a begin marker and an end marker as shown in the image to the right. To set a marker, place the tracking bar where you would like the marker to be placed and then either select the "Markers" pulldown menu or right click on the audio waveform. This will bring up a popup menu with options for setting a begin or end marker as shown in the image below.


    Audio Editor Markers Pulldown Audio Editor Markers Input After a begin or end marker has been set it will always appear when the track waveform is displayed. To erase begin or end markers simply select one of the "Erase" options from the popup menu shown in the image. Marker positions can also be set manually. This can be done by selecting the "Input Marker Times" option from the "Markers" pulldown menu. After selecting this option the "Input Marker Times" dialog box will appear as shown to the right. Simply input the desired marker position time in minutes and seconds and select "OK". Once you've set marker positions, you can use them to perform editing on the section of audio section between the markers.