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:
analyzing means analyzing input signal characteristics; mapping processing means conducting amplitude conversion of the input signal on the basis of a predetermined linear function or nonlinear function; weighting controlling means respectively multiplying a plurality of the input signals, which have been respectively amplitude-converted on the basis of mutually different functions by a plurality of the mapping processing means, by weights determined by the analysis result for the input signal characteristics; and adding means generating an output signal by adding together the plurality of input signals which have been multiplied by the weights.