METHOD AND DEVICE FOR PRODUCING A DOWNWARD COMPATIBLE SOUND FORMAT

摘要

In order to reduce the disturbing background noises that may arise during the summation with weighting of the spectral coefficients using a correction factor in a downmix method, the proposition is made that the correction factors m(k) are computed as follows: eA(k) = Real(A(k)) Real(A(k)) + Imag(A(k)) · Imag(A(k)) eB(k) = Real(B(k)) · Real(B(k)) + Imag(B(k)) · Imag(B(k)) x(k) = Real(A(k)) · Real(B(k)) + Imag(A(k)) · Imag(B(k)) w(k) = D · x(k)/(eA(k) + L · eB(k)) m(k) = (w(k)2 + 1) (1/2) - w(k) wherein m(k) is the kth correction factor; and A(k) is the kth spectral value of the signal to be prioritized; and B(k) is the kth spectral value of the signal not to be prioritized; and D is the degree of compensation; and L is the degree of the limitation of the compensation.