An information compression method and apparatus, a compression information decompression method and apparatus, a compressed information recording / transmission apparatus, a compressed information reproduction apparatus, a compressed information reception apparatus, and a recording medium (method and device for expanding compressed information, recording / transmitting compressed information, device for receiving compressed information, and recording medium)

摘要

[Configuration] A comparison circuit 409 for comparing the power calculation results with the power calculation circuits 404 to 406 for calculating the power of the channel signal, decision circuits 412, 413 and 444 for determining the processing block size, And a channel correlation coefficient calculating circuit 411 for calculating a correlation between channels. When a signal correlation is high between channels, a masking effect on the processing block is calculated. When a masking effect is obtained, If the masking effect is not obtained, the orthogonally transformed block sizes of all the channels are temporally shortened to the same length.;[Effect] It is possible to provide a method of deciding the temporal length of a processing block which is audibly favorable for compression of an information signal that fluctuates with time, and it is possible to perform auditory audition, high efficiency compression to good sound quality, and extension .