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A novel numerical design approach for allpass transformed DFT filter-banks with subsampling is proposed. Such frequency warped filter-banks possess a non-uniform time-frequency resolution which is of interest, e.g., for speech and audio processing. The coefficients of the FIR synthesis filters are determined by a constrained least-squares error (CLSE) design. Thereby, the stopband energy of the synthesis...
An improved approach for the estimation of the frequency dependent reverberation time (RT) by means of allpass transformed filter-banks is presented. It is shown that by means of these warped filter-banks, a much more accurate RT estimation at lower frequencies can be obtained than by octave filter-banks, which are commonly used for the estimation of the frequency dependent RT. Furthermore, allpass...
A versatile filter-bank concept for adaptive subband filtering is proposed, which achieves a significantly lower algorithmic signal delay than commonly used analysis–synthesis filter-banks. It is derived as an efficient implementation of the filter-bank summation method and performs time-domain filtering with coefficients adapted in the uniform or non-uniform frequency-domain. The frequency warped...
A digital filter structure is proposed for fixed or adaptive spectral modification of speech and audio signals, which is derived from a reference filter bank. Main applications are audio equalization and noise reduction. The signal is filtered in the time domain, while the filter coefficients are calculated in the (short-term) frequency domain. In comparison to the usual short-term spectral-domain...
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