Signal Processing Method, Information Compression Device, Compression Information Extension Device, Compression Information Recording / Transmitter

摘要

[Configuration] Power calculation circuits 404 to 406 for calculating the power of the channel signal, comparison circuit 409 for comparing the power calculation results, and determination circuits 412, 413 for determining the processing block size from the comparison results. 144 and a channel correlation coefficient calculating circuit 411 for calculating the correlation between the channels, when the signal correlation between the channels is high, the masking effect for the processing block is calculated, and when the masking effect is obtained. The orthogonal transform block sizes of all the channels are made to have a long time and the same length in time, and when the masking effect is not obtained, the orthogonal transform block sizes of all the channels are made to be short in time and the same length.;[Effects] It is possible to provide a method of determining the temporal length of a processing block that is acoustically desirable for compression of information signals that vary in time, and can perform high-efficiency compression and extension to audible images and good sound quality. Done.