DIGITAL SIGNAL PROCESSING METHOD, DIGITAL SIGNAL PROCESSING UNIT, DIGITAL SIGNAL RECORDING METHOD, DIGITAL SIGNAL RECORDER, RECORDING MEDIUM, DIGITAL SIGNAL TRANSMISSION METHOD AND DIGITAL SIGNAL TRANSMITTER

PROBLEM TO BE SOLVED: To improve the static characteristic and the sound quality by conducting an adjustment operation depending on an input digital signal and realizing more efficient coding with a proper processing amount resulting from the adjustment operation. SOLUTION: In the case of calculating a bit share amount for each 2-dimension block with respect to time and frequency and a total number of assigned bits for all the 2-dimension blocks is not matching a bit rate specified by a coding format depending on a result of integer processing of the bit share amount or the like, an arithmetic means in a bit assignment calculation circuit 118 calculates a maximum possible quantization error in the 2-dimension blocks based on the bit assigned amount calculated tentatively and normalized data or a maximum signal component in the 2-dimension blocks for each 2-dimension block with respect to time and frequency in order to make them match each other, and conducts the adjustment operation of bits based on the bit necessity by recognizing the maximum quantization error as the bit necessity of each 2-dimension block.