| 摘要 |
A filterbank comprises a plurality of multipliers (M<SB>0</SB>...M<SB>M-1</SB>) connected to receive respective samples (x(n) ...x(n-M+l)) of an input signal and operable to multiply the samples by respective coefficients (c<SB>0</SB>(k)...c<SB>M-1</SB> (k)) to produce a plurality of multiplied signals, and adding means (a<SB>1</SB>...a<SB>M-1</SB>) operable to add the multiplied signals to give a filterbank signal y(n). The frequency contents of the input signal are determined by determining a first set of coefficients, which gives the filterbank output having the largest magnitude, determining a second set of coefficients and interpolating between the first and second sets of coefficients to give a third set of coefficients, which third set is indicative of the frequency contents of the input signal. |
