Time Stretch |
The Time Stretch effect allows you to alter the length of a signal without changing its pitch.
Open the Sonic Foundry Time Stretch dialog.
Choose a preset from the Name drop-down list, or adjust the controls as desired:
a. Choose a Mode from the drop-down list.
Time Stretch provides 19 different modes that are designed to maintain the highest quality for specific types of material. A mode that works great for drums will not work as well for string pads, for example.
You
should be able to achieve excellent results for ratios between 75%
and 115%. Beyond this range, you will start to hear artifacts such as
echoes, flanging, or drop-outs. Also, running the process a number of
times using small increments (such as 105%) will create different
effects than processing all at once with a large time change.
b. Drag the Final Percentage slider to change the length of the selection.
The
Final Percentage
slider may be displayed as Final
Percentage,
Final Time,
or Final tempo,
depending on the setting of the Input
format drop-down list.
The Time Stretch function allows you to change the length of your sounds in three different ways: percentage of original, time, or tempo. Choose a setting from the Input format drop-down list to change the time format.
Because DirectX does not provide a way for a plug-in to know the total length of the data it is processing, you must tell the plug-in beforehand if you are using the Time or Tempo settings. For example, if you know your sound file is 32 seconds long and you need it to be 30 seconds long, you must first choose Time from the Input format drop-down menu and type 00:00:32 into the Initial Time box. Now, when you drag the Final Time slider, you are changing the sound with reference to time. Drag the slider until the Final time box reads 00:00:30.