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MPEG-4 Book, The by Touradj Ebrahimi, Fernando Pereira

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11.1. Introduction to Time/Frequency Audio Coding

The term T/F coder was chosen in MPEG-4 to refer to coders that adhere to the traditional paradigm of perceptual audio coding by coding a spectral (frequency domain) representation of the input signal rather than the time domain signal itself. This type of coding technology has made tremendous progress in the past 10 years and has become the coder type of choice for music distribution in broadcasting, over the Internet, and on other media. This may be explained by the fact that the T/F coder framework combines both redundancy reduction and exploitation of the potential provided by irrelevancy removal. Coding of a spectral representation is an efficient way of exploiting linear correlation between ...

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