Patent Number: 8,818,764

Title: Downmixing device and method

Abstract: A downmixing device includes: a matrix conversion unit configured to perform a matrix operation for an input signal; a rotation correction unit configured to rotate an output signal of the matrix conversion unit; a spatial information extraction unit configured to extract spatial information from the output signal of the rotation correction unit; and an error calculation unit configured to calculate an error amount of the matrix operation result for the input signal by performing a matrix operation for the output signal of the rotation correction unit and the spatial information extracted by the spatial information extraction unit using a matrix that is inverse to the matrix used for the matrix operation by the matrix conversion unit.

Inventors: Kishi; Yohei (Kawasaki, JP), Suzuki; Masanao (Kawasaki, JP), Shirakawa; Miyuki (Fukuoka, JP), Tsuchinaga; Yoshiteru (Fukuoka, JP)

Assignee: Fujitsu Limited

International Classification: H03F 1/26 (20060101)

Expiration Date: 8/26/12018