Compressing sounds for export 323
3. For Sample Rate, select an option to control sound fidelity and file size. Lower rates
decrease file size but can also degrade sound quality. Rate options are described in the
following list:
5 kHz is barely acceptable for speech.
11 kHz is the lowest recommended quality for a short segment of music and is one-quarter
of the standard CD rate.
22 kHz is a popular choice for web playback and is half the standard CD rate.
44 kHz is the standard CD audio rate.
Using the MP3 compression option
The MP3 compression option lets you export sounds with MP3 compression. Use MP3 when
you are exporting longer stream sounds such as music sound tracks.
If you are exporting a file that was imported in MP3 format, you can export the file using the
same settings the file had when it was imported.
To export an imported MP3 file with the same settings the file had when it was
imported:
1. In the Sound Properties dialog box, select MP3 from the Compression menu.
2. Select Use Imported MP3 Quality (the default setting). Deselect this option to select other
MP3 compression settings, as defined in the following procedure.
To use MP3 compression:
1. In the Sound Properties dialog box, select MP3 from the Compression menu.
2. Deselect Use Imported MP3 Quality (the default setting).
3. For Bit Rate, select an option to determine the bits per second in the exported sound file.
Flash supports 8 through 160 Kbps CBR (constant bit rate). When you are exporting
music, set the bit rate to 16 Kbps or higher for the best results.
4. For Preprocessing, select Convert Stereo to Mono to convert mixed stereo sounds to
monaural. (Mono sounds are unaffected by this option.)
NOTE
Flash cannot increase the kHz rate of an imported sound above the rate at which it
was imported.
NOTE
The Preprocessing option is available only if you select a bit rate of 20 Kbps
or higher.
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