Feedforward estimate of the scale factor which is based on the allowance possible distortion of the noise which is formed to the occasion where it compresses in the psychological acoustic base

摘要

The digital signal, especially, it is the method of encoding the audio signal, the scale factor where the frequency sub band where the signal differs is desirable is estimated. In order to calculate total scaling value, with transfer coefficient it can use the distortion threshold which it is related with each of the frequency sub band of the signal and one), because of this, the product of transfer coefficient and the respective total scaling value of the sub band of given, is warped (concerning each frequency sub area and becomes smaller than even one to which threshold corresponds. At the time of applying audio encoding, it is warped and threshold is based on the psychological acoustic masking. As for profit and this approximation, the 1st section is acquired in order to calculate total scaling value on the basis of the distortion threshold which corresponds as for this invention, making use of new approximation, the 2nd section is acquired on the basis of the harmony of transfer coefficient. Both of these sections can be acquired making use of the look-up table.