### Length L FIR Frame Filters

To avoid time aliasing, we restrict the filter length to a maximum of samples. Since is an arbitrary multiplicative weighting of the th spectral frame, the frame filter need not be causal. For odd , the filter impulse response indices may run from to , where

 (9.43)

This gives

This is the general length time-varying FIR filter convolution sum for time , when is odd.

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