One of the types of objects in Praat. See the Sound files tutorial.
A LongSound object gives you the ability to view and label a sound file that resides on disk. You will want to use it for sounds that are too long to read into memory as a Sound object (typically, a few minutes).
You create a LongSound object with Open long sound file... from the Open menu.
You can save a LongSound object to a new sound file, perhaps in a different format (AIFF, AIFC, WAV, NeXT/Sun, NIST, FLAC) with the commands in the Save menu. You can also concatenate several LongSound objects in this way. See How to concatenate sound files.
You can view a LongSound object in a LongSoundEditor by choosing LongSound: View. This also allows you to extract parts of the LongSound as Sound objects, or save these parts as a sound file. There are currently no ways to actually change the data in the file.
You can label and segment a LongSound object after the following steps:
A TextGridEditor will appear on the screen, with a copy of the LongSound object in it.
The length of the sound file is limited to 2 gigabytes, which is 3 hours of CD-quality stereo, or 12 hours 16-bit mono sampled at 22050 Hz.
© ppgb, January 31, 2011