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