Verfahren und Gerät zur adaptiven Merkmalsänderung bei eindimensionalen Signalen

摘要

The invention relates to a method and device for modifying the characteristics of one-dimensional signals, said signals being converted into a digital representation, while using the adaptive "Overlap-Add" Algorithm. The algorithm executes the characteristic modification according to an appropriate discrete spectral transformation by means of multiplication in the frequency range, and subsequently generates the output signal by means of corresponding inverse discrete spectral transformation as well as by means of overlapping and offset addition of several signal sections yielded by the inverse spectral transformation. The invention is characterized in that the frequency response function is convoluted with an appropriately selected discrete window function before the multiplications in the frequency range. Said window function has a significantly smaller length than that of the frequency response function. The inventive window evaluation enables the time domain over-convolution errors ("time-domain-aliasing errors") in the output signal to be reduced to below an eligible limiting value, whereby the additional calculating effort is dependent on this limiting value but, overall, is very small.