AAC is the short of Advanced Audio Coding which is an audio format co-developed by Fraunhofer IIS-A, Dolby and AT&T.  AAC format could only be supported by hard drive-based MP3 of Apple for the time being. The algorithms used by AAC is different from that by MP3, and AAC could provide a better sound quality under the condition of compressing files to 30 percents smaller than MP3.

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.

To convert aac to asf: please install the aac decoder based on DirectShow on your Windows system. Run "regsvr32" to register the codec.


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

CDA means CD Tracks and it is a familiar file format in CD music discs. With its biggest feature of approximate lossless and basically faithful to the soundtrack, cda is the best choice for speaker enthusiast. But the file in CD with extension of .CDA contains only an index information but not real sound information. So no matter how long a CD file is, the .cda file is always 44-byte-long. And files can not be played when CDA files are copied directly to the hard drive.

To convert cda to asf, please install the CDDA Reader filter for reading CDA file. Use WinRar unzip the file, run "regsvr32" to register it.

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