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Thursday, June 16, 2011

Wav, mp3, aiff

Wav: 
WAV is an audio file format that was developed by Microsoft. It is so wide spread today that it is called a standard PC audio file format. A Wave file is identified by a file name extension of WAV (.wav) This allows content developers to freely move audio files between platforms for processing, this file format stores information about the file's number of tracks (mono or stereo), sample rate, bit depth, as well as the uncompressed raw audio data.


mp3:

The name of the file extension and also the name of the type of file for MPEG, audio layer 3. Layer 3 is one of three coding schemes (layer 1, layer 2 and layer 3) for the compression of audio signals. Layer 3 uses perceptual audio coding and psychoacoustic compression to remove all unnecessary information . It also adds a MDCT (Modified Discrete Cosine Transform) that implements a filter bank, increasing the frequency resolution 18 times higher than that of layer 2.The result in real terms is layer 3 shrinks the original sound data from a CD(with a bit rate of 1411.2 kilobits per one second of stereo music) by a factor of 12 (down to 112-128kbps) without sacrificing sound quality.
Aiff:
Short for Audio Interchange File Format, a common format for storing and transmitting sampled sound. The AIFF format does not support data compression so AIFF files tend to be large. However, there is another format called AIFF-Compressed (AIFF-C orAIFC) that supports compression ratios as high as 6:1.



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