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Using the ADPCM compression option

The ADPCM compression option sets compression for 8-bit or 16-bit sound data. Use the ADPCM setting when you are exporting short event sounds such as button clicks.

To use ADPCM compression:

  1. In the Sound Properties dialog box, select ADPCM from the Compression menu.
  2. For Preprocessing, select Convert Stereo to Mono to convert mixed stereo sounds to mono (monaural). (Mono sounds are unaffected by this option.)
  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 as follows:

    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.

    Note: Flash cannot increase the kHz rate of an imported sound above the rate at which it was imported.

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