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| ACT audio file | |
|---|---|
| Filename extension | .act[1] |
| Developed by | Actions Semiconductor |
| Type of format | audio file |
| Standard | most Chinese MP3 and MP4 players |
ACT is a lossy ADPCM 8 kbit/s compressed audio format recorded by most Chinese MP3 and MP4 players with a recording function, and voice recorders.
Many models of recorder that use the ACT format do so only for their lowest-quality recording setting; if the quality setting is increased then a different format, typically WAV, is used, creating much larger files.
There are different versions of ACT; files produced by later devices could not as of June 2009[update] be read by any free standard audio player and converter software, only by the supplied MP3 utilities.
Devices which record in this format are usually supplied with an ACT to WAV converter program that runs under Microsoft Windows; the converter usually used can be downloaded as part of MP3 Player Utilities. Konvertor can play and convert the format too.
Linux command-line utility SoX supports .act files. The following command converts an .act file to another format:
sox -i -r8k -tima -c1 infile.act outfile
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