Coding device, coding method, decoding device, decoding method, program recording medium and data recording medium

摘要

A signal component coding circuit codes spectral components from a transform circuit for converting an audio signal to spectral components. A code string generation circuit generates a code string block of each unit time from the coded data from the signal component coding circuit. A compression rate change circuit changes the compression rate of the code string from the code string generation circuit, if necessary. For example, when the compression rate needs to be changed because of a change of the transmission capacity of a transmission line, the compression rate change circuit extracts codes of respective signal components from the code string, if necessary, and thus generates a code string having a changed compression rate. With such a structure, it is possible to solve the problem that processing to be carried out at a high speed such as real-time processing of compression rate change cannot be suitably carried out since an operation scale substantially similar to that of decoding and coding of an acoustic waveform signal is required in generating a code string having a changed compression rate from a code string outputted from a coding device.