ACT (audio format)
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 be read by any free standard audio player and converter software, only by the supplied MP3 utilities. Decoding .act files. Using Windows . 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/index.html) can play and convert the format too. Using Linux. 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