METHOD AND SYSTEM OF GIVING SOUND FIELD EFFECT OF AUDIO DIGITAL SIGNAL

摘要

PURPOSE: To change the reverberation time of an acoustic space to be simulated as a function of the frequency of an acoustic signal. CONSTITUTION: For the purpose of obtaining an audio digital signal y(k) where an acoustic field effect is given to an audio digital signal x(k), a fundamental signal xi(k) obtained by copying the signal x(k) is delayed by different times, and delay fundamental signals seri are added to the signal x(k) after being weighted to obtain a signal y(k). A signal serci obtained by linear coupling or delay fundamental signals is added to the signal xi(k). Further, linear coupling is performed by unit loop-back for the purpose of simulating later reverberation, and attenuation hi(ω) which is a decay monotone function of a reverberation Tr(ω) to be simulated and is proportional to delay is applied together with delay. Such spectrum correction t(exp(jω)) is applied before weighting that the square of the absolute value is equal to Στi/Tr(ω) based on sound absorption delay τi.