ENCODING APPARATUS, ENCODING METHOD, DECODING APPARATUS, DECODING METHOD, RECORDING APPARATUS, RECORDING METHOD, REPRODUCING APPARATUS, REPRODUCING METHOD, AND RECORD MEDIUM

摘要

PURPOSE: A reproducing apparatus is provided to operate various functions by changing normalization information of a encoded data, such as a digital audio signal, corresponding to a time data parameter. CONSTITUTION: An encoding apparatus for highly efficiently encoding an input digital signal comprises a band dividing means, an encoding means, a normalization processing means, a quantization coefficient calculating means, a bit allocating means, a normalization information changing means, and an encoded data generating means. The band dividing means divides the input digital signal into a plurality of frequency band components. The encoding means block-segments a sequence of samples arranged in a time-base direction and/or a frequency-base direction of the input digital signal divided in the plurality of frequency band components and encodes each block. The normalization processing means normalizes a signal component of each block encoded by the encoding means and generates normalization signal. The quantization coefficient calculating means calculates quantization coefficients that represent a feature of the signal component of each block. The bit allocating means decides the number of allocated bits for each block corresponding to the quantization coefficients calculated by the quantization coefficient calculating means. The normalization information changing means gradually changes the normalization information generated by the normalization processing means corresponding to a user's operation on a time base,. The encoded data generating means re-quantizes the signal component of each block corresponding to the normalization information changed by the normalization information changing means and the number of allocated bits allocated by the bit allocating means and generates encoded data corresponding to a predetermined format.