Several high quality audio applications require the use of long finite impulse response (FIR) filters to model the acoustical properties of a room. Several structures for subband filtering are examined. These structures have the ability to divide long FIR filters into smaller FIR filters that are easier to use. Two structures will be discussed to process the signals in a real-time manner, time-convolution of spectrograms and generalized filterbanks. Also filter estimation will be discussed.
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