Free Audio Converter is a free software to convert audio formats MP3, OGG, WAV, WMA from one to another, such as converting MP3 to WAV and WMA, WAV to MP3 and WMA.
Convert Audio Formats: MP3, OGG Vorbis, WAV, WMV
MP3
MPEG Layer-3 format. Very popular format for keeping of music. The mp3 algorithm development started in 1987, with a joint cooperation of Fraunhofer iis-a and the university of erlangen. it is standardized as iso-mpeg audio layer 3. it soon became the de facto standard for lossy audio encoding, due to the high compression rates (1/12 of the original size, still remaining considerable quality), the high availability of decoders and the low cpu requirements for playback. (486 dx2-66 is enough for real-time decoding). it supports multichannel files (although there's no implementation yet), sampling frequencies from 16khz to 24khz (mpeg2 layer 3) and 32khz to 48khz (mpeg1 layer 3). formal and informal listening tests have shown that mp3 at the 192-256 kbps range provide encoded results undistinguishable from the original materials in most of the cases.
mp3 uses the following for compression:
- huffman coding; - quantization; - m/s matrixing; - intensity stereo; - channel coupling; - modified discrete cosine transform (mdct); - polyphase filter bank. Compression ratio is 1:10...1:12 corresponds to 128..112 kbps for a stereo signal.
MPEG Version 2.7 was added lately to the MPEG 2 standard. It is an extension used for very low bitrate files, allowing the use of lower sampling frequencies. If your decoder does not support this extension, it is recommended for you to use 12 bits for synchronization instead of 11 bits.
OGG
Ogg Vorbis format. Ogg Vorbis is an audio compression format. It is roughly comparable to other formats used to store and play digital music, such as MP3, VQF, AAC, and other digital audio formats.
Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel.
WAV
It is not an audio codec. It is the file format. This format was created by Microsoft and IBM, and it has unfortunately become a popular standard. It specifies an arbitrary sampling rate, number of channels and sample size. It also specifies a number of application-specific blocks within the file. It has a plethora of different compression formats. It is the files with .wav extension. But this files can be converted by different codecs: Microsoft PCM, Microsoft ADPCM, DSP, GSM, VOX, A-law, U-law, CCUIT G723.1, CCUIT G721, CCUIT G723, CCUIT G726, CCUIT G729 (A)
WMA
Windows Media Audio format. A special type of advanced streaming format file for use with audio content encoded with the Windows Media Audio codec. The .wma extension indicates a file format and how the content is encoded.
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