ACT (audio format)

Short description: Lossy audio recorder format

ACT audio fileFilename extension| `.act`[1]

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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.

## Contents

* 1 Decoding .act files
* 1.1 Using Windows
* 1.2 Using Linux
* 2 References

## 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

## References

1. ↑ "ACT File Extension - What is it? How to open an ACT file?". http://filext.com/file-extension/ACT.

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