Patent ID: 11871211
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A signal processing device, comprising:
an expansion coefficient calculation unit, implemented using one or more computing devices, configured to, from an outward sound field to be reproduced, calculate a spherical harmonics expansion coefficient for reproducing the sound field;
an expansion coefficient conversion unit, implemented using one or more computing devices, configured to convert the calculated spherical harmonics expansion coefficient into a weight factor for superposition of multipole sources;
a filter coefficient calculation unit, implemented using one or more computing devices, configured to, from the weight factor, calculate a filter coefficient corresponding to each speaker included in a multipole speaker array, the each speaker providing output outwardly; and
a convolution operation unit, implemented using one or more computing devices, configured to convolve the filter coefficient corresponding to the each speaker into an input acoustic signal to calculate an output acoustic signal for the each speaker.