Signal processing method and apparatus, and code string generating method and apparatus

摘要

A signal of a first code string, in which a code string in a predetermined format is partially replaced with dummy data, is transferred to a code string rewriting unit via a code string decomposition unit. A signal of a second code string for replacing the dummy data in the signal of the first code string is transferred to a control unit, and the amount of dummy data in a mid-range spectrum is calculated in a mid-range spectrum dummy data amount calculation unit. The control unit transfers data for replacing the dummy data to the code string rewriting unit, where the dummy data in the first code string is rewritten therewith.