WAV, i.e. Waveform audio format, is the earliest digital audio format developed by Microsoft. All sorts of coding technology could be supported by increasing driver program. Wave is not suit for spreading and listening, but for storing the original audio files.

ASF is Advanced Streaming Format. It is an extensible file format developed primarily for storing synchronized digital video, audio, subtitle streams, or transmitting data on the internet. ASF is also a multimedia container of Windows Media Video or Windows Media Audio.

WAV supports many kinds of encoding methods. To convert normal wav to wma, you do not need to install extra wav decoder.


Download ASF Converter which can convert wav to asf file. Select a wav file, change audio encoding bitrate if necessary,  rename the output file to asf extension.

SpeeX is a free software speech codec which declares to be free from any patent restrictions. It aims to to make a codec that would be optimized for high quality speech and low bit rate by adopting wide range of bit rates and supporting ultra-wideband mode at 32 kHz (up to 48 kHz). Being robust to lost packets but not to corrupted ones, Speex may be directly transmitted over UDP/RTP or used with the Ogg container format. *.spx is the file extension of Speex.

Please install Speex codec to convert spx to asf.


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