ACT (audio format)
|Developed by||Actions Semiconductor|
|Type of format||audio file|
|Standard(s)||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.
However, 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 such as WAV is used instead (albeit at the expense of using up recorder memory more quickly).
There are different versions of ACT; files produced by later devices cannot as of June 2009[update] be read by any free standard audio player and converter software, only by the supplied MP3 utilities.
Decoding .act files
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 (http://www.logipole.com/indexe.html) can play and convert the format too.
Act files can be converted by numerous programs.
One command-line utility that is able to read .act files is SoX. A command line that converts an .act file to another file format is the following:
sox -i -r8k -tima -c1 infile.act outfile
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