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Wave File Compression Codecs Compared
Audio Compression ManagerThis is a reference to compare the audio quality and compression bitrates of the different wave compression codecs available for ".wav" and ".dct" files using the audio compression manager including PCM, GSM, ADPCM, CELP, SBC, TrueSpeech and MPEG Layer-3. Note: The Audio Compression Manager (ACM) is used for recording to .wav (wave) or .dct (dictation) files. For other file formats, please start with the Sound File Formats page.
The ACM is used by:
The audio file compression formats listed on this page are low bitrate speech formats. Higher bitrate music and broadcast voice formats are not listed.
You can listen to samples of each audio format by clicking on the "Sample" link.
CommentsThe above are wave files - even if they have the mp3 codec they will have the ".wav" or ".dct" extension. For a broader overview of other file formats, please see the Sound File Formats page.
Recommended CodecNCH Software currently recommends GSM6.10 8000Hz for voice recording.
Problem FormatsThe ACM codec shipped with Windows 2000/XP called "Microsoft G.723.1" has a bug which means it cannot be used for encoding / recording. Please do not attempt to use this format.
Discussion ForumIf you have any questions in ACM codecs or are generally interested please see the Sound Formats Discussion Forum.
Software that Support ACMA number of the NCH Software professional audio software applications include the Audio Compression Manager:
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