A wideband audio signal coding device, a wideband audio signal decoding device, a broadband audio signal code decoding device, and a broadband audio signal recording medium

摘要

A wideband audio signal coding apparatus, a wideband audio signal coding apparatus, and a wideband audio signal recording medium each having a wideband and a high dynamic range at a low bit rate as compared with the prior art are provided. The wideband audio data is divided into signal data of a predetermined natural number N subbands, the number of quantization bits for sub-sampling is determined based on the noise floor information of the wideband audio data, and the number of quantized bits of the N subbands The coded data obtained by multiplexing the signal data of the N subbands sub-sampled and sub-sampled as the number of quantum bits is recorded in the wideband audio signal recording medium. As a result, it is possible to realize both natural recording and reproduction which can realize extremely high dynamic range and high band characteristics at a relatively low bit rate per channel at the same time and reproduce to ultrahigh range as an endless transferee, And a reproduction sound field can be realized.