ACT (audio format)

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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.

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 be read by any free standard audio player and converter software, only by the supplied MP3 utilities.

Decoding .act files[edit]

Using Windows[edit]

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.

Act files can be converted by numerous programs, such as Bigasoft Audio Converter, iDealshare VideoGo, etc.

Using Linux[edit]

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