Audio coding device and method

摘要

An audio coding device that performs predictive coding on a third-channel signal included in a plurality of channels in an audio signal according to a first-channel signal and a second-channel signal, which are included in the plurality of channels, and to a plurality of channel prediction coefficients included in a coding book, the device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, selecting channel prediction coefficients corresponding to the first-channel signal and the second-channel signal so that an error, which is determined by a difference between the third-channel signal before predictive coding and the third-channel signal after predictive coding, is minimized; and controlling the first-channel signal or the second-channel signal so that the error is further reduced.

主权项

1. An audio coding device that performs predictive coding on a third-channel signal included in a plurality of channels in an audio signal according to a first-channel signal and a second-channel signal, which are included in the plurality of channels, and to a plurality of channel prediction coefficients included in a coding book, the device comprising:
a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, selecting a first channel prediction coefficient corresponding to the first-channel signal from the coding book and a second channel prediction coefficient corresponding to the second-channel signal from the coding book so that an error, which is determined by a difference between a value of the third-channel signal before predictive coding and a value of the third-channel signal after predictive coding, is minimized; controlling at least one of a value of the first-channel signal and a value of the second-channel signal, so that the error is further reduced, the controlling including calculating an allowable control range within which at least one of the first-channel signal and the second-channel signal is not affected in subjective sound quality and determining an amount by which at least one of the first-channel signal and the second-channel signal is controlled from the allowable control range; and calculating the value of the third-channel signal after predictive coding by combining both a first value and a second value, the first value being given by multiplying the first channel prediction coefficient by the value of the first-channel signal and the second value being given by multiplying the second channel prediction coefficient by the value of the second-channel signal.