Signal processing apparatus and method, program, and data recording medium

摘要

The present invention relates to a signal processing apparatus and method, a program, and a data recording medium configured such that the playback level of an audio signal can be easily and effectively enhanced without requiring prior analysis. An analyzer 21 generates mapping control information in the form of the root mean square of samples in a given segment of a supplied audio signal. A mapping processor 22 takes a nonlinear function determined by the mapping control information taken as a mapping function, and conducts amplitude conversion on a supplied audio signal using the mapping function. In this way, by conducting amplitude conversion of an audio signal using a nonlinear function that changes according to the characteristics in respective segments of an audio signal, the playback level of an audio signal can be easily and effectively enhanced without requiring prior analysis. The present invention may be applied to portable playback apparatus.

主权项

1. A signal processing apparatus comprising:
a circuitry configured to
initiate an analysis of input signal characteristics;initiate an amplitude conversion of the input signal on the basis of a predetermined linear function or nonlinear function;initiate a multiplication of a plurality of the input signals, which have been respectively amplitude-converted on the basis of a plurality of mutually different functions, by respective weights determined by a result of the analysis of the input signal characteristics; andinitiate a generation of an output signal by adding together the plurality of the input signals which have been multiplied by the weights, wherein as a volume of audio based on the input signal decreases overall, the amplitude conversion of the input signal is conducted using a mapping function having a steeper slope.