One might argue that a linear transform of a linear transform is just another linear transform, and thus I am just wasting time. In this case, though, the frequency basis is needed to quantize the data according to the masking threshold, and thus the KLT cannot immediately be used without the MDCT step.

A linear transform can be thought of in many different ways. The MDCT here is best viewed as a subband filter bank, while the KLT is viewed as a change of basis in an -dimensional space, where is the length of the transform block.

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