TY - JOUR
T1 - Scattering in Feedback Delay Networks
AU - Schlecht, Sebastian J.
AU - Habets, Emanuel A.P.
PY - 2020/6/10
Y1 - 2020/6/10
N2 - Feedback delay networks (FDNs) are recursive filters, which are widely used for artificial reverberation and decorrelation. One central challenge in the design of FDNs is the generation of sufficient echo density in the impulse response without compromising the computational efficiency. In a previous contribution, we have demonstrated that the echo density of an FDN can be increased by introducing so-called delay feedback matrices where each matrix entry is a scalar gain and a delay. In this contribution, we generalize the feedback matrix to arbitrary lossless filter feedback matrices (FFMs). As a special case, we propose the velvet feedback matrix, which can create dense impulse responses at a minimal computational cost. Further, FFMs can be used to emulate the scattering effects of non-specular reflections. We demonstrate the effectiveness of FFMs in terms of echo density and modal distribution.
AB - Feedback delay networks (FDNs) are recursive filters, which are widely used for artificial reverberation and decorrelation. One central challenge in the design of FDNs is the generation of sufficient echo density in the impulse response without compromising the computational efficiency. In a previous contribution, we have demonstrated that the echo density of an FDN can be increased by introducing so-called delay feedback matrices where each matrix entry is a scalar gain and a delay. In this contribution, we generalize the feedback matrix to arbitrary lossless filter feedback matrices (FFMs). As a special case, we propose the velvet feedback matrix, which can create dense impulse responses at a minimal computational cost. Further, FFMs can be used to emulate the scattering effects of non-specular reflections. We demonstrate the effectiveness of FFMs in terms of echo density and modal distribution.
KW - artificial reverberation
KW - echo density
KW - Feedback delay network
KW - paraunitary matrices
KW - scattering
UR - http://www.scopus.com/inward/record.url?scp=85087820955&partnerID=8YFLogxK
U2 - 10.1109/TASLP.2020.3001395
DO - 10.1109/TASLP.2020.3001395
M3 - Article
AN - SCOPUS:85087820955
SN - 2329-9290
VL - 28
SP - 1915
EP - 1924
JO - IEEE/ACM Transactions on Audio Speech and Language Processing
JF - IEEE/ACM Transactions on Audio Speech and Language Processing
M1 - 9113451
ER -