Select the product you need help with
- Internet Explorer
- Windows Phone
- More products
How to Use Sound Recorder to Change Compression Settings
Article ID: 142745 - View products that this article applies to.
This article was previously published under Q142745
This article describes how to change the audio codec used to compress a wave (.wav) sound file. An audio codec is an algorithm used to compress and decompress sound files. If the codec used to compress a .wav file does not provide the compression ratio or some other feature you want, you can use the steps described in this article to change the codec used to compress the file.
To change the audio codec used to compress a .wav file, follow these steps:
For example, the Microsoft Adaptive Delta Pulse Code Modulation (ADPCM) and Microsoft Interactive Multimedia Association (IMA) ADPCM codecs can both achieve a 4:1 compression ratio, but the IMA ADPCM codec compresses files faster. The Microsoft Groupe Special Mobile (GSM) 6.10 codec can achieve only a 2:1 compression ratio, but offers a greater number of sampling rates. The Microsoft Consultative Committee for International Telephone and Telegraph (CCITT) G.711 A-Law and u-Law codec can also achieve only a 2:1 compression ratio, but is best when compatibility with current Telephony Application Programming Interface (TAPI) standards is a concern. The DSP Group Truespeech Software codec achieves the highest compression ratio, and is best in voice sampling applications.
Changing the attributes associated with a .wav file may cause the file to increase or decrease in size, but does not normally make the file sound better. In particular, compressing a .wav file or increasing the compression ratio used on a .wav file does not usually make the file sound better.
Note that GSM is primarily designed for the efficient compression of speech. Using GSM to compress music an result in poor audio quality.