Filtering apparatus, filtering method, program, and surround processor
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United States of America Patent
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Apr 30, 2013
Grant Date -
Sep 16, 2010
app pub date -
Mar 8, 2010
filing date -
Mar 13, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filtering apparatus for obtaining an output in a case where a discrete-time signal having a length of N (N is an integer) is input to an FIR filter with a filter coefficient having a length of M (M is an integer, N≧M−1), including: a division unit for dividing the discrete-time signal; a first zero padding unit for padding zero after the discrete-time signals; a first fast Fourier transform unit for performing FFT on the zero padded data; a second zero padding unit for padding zero after the filter coefficient; a second fast Fourier transform unit for performing FFT on the zero padded data; a multiplication unit for multiplying the frequency domain data by the frequency domain data; an inverse fast Fourier transform unit for performing IFFT on the multiplication results; and an adder unit for adding the discrete-time signals.
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