METHOD AND SYSTEM FOR MODIFYING AN AUDIO SIGNAL, AND FILTER SYSTEM FOR MODIFYING AN ELECTRICAL SIGNAL

摘要

There is provided a filter system for modifying an electrical signal. The filter system has an input for receiving an electrical signal to be modified, a subtraction circuit for deliver- ing a modified output signal, a direct signal part between the input and the subtraction circuit, and a modifying signal part between the input and the subtraction circuit. The modifying signal part comprises one or more inverse comb filter signal paths, where each inverse comb filter signal path has circuitry for performing an inverse comb filter function. The subtraction circuit is designed for performing a subtraction of the signals supplied via the direct signal part and the modifying signal part to thereby obtain the modified output signal. The hereby provided filter system may be used as an inverse comb filter system for modifying an audio signal in an audio system. Thus, there is also provided an audio system having an audio signal source for outputting an electrical signal representing an acoustic audio signal, and a sound source for reproducing an acoustic audio signal, said sound source having an electrical signal input and being operative to generate an acoustic audio output in response to a signal supplied to the electrical signal input. The audio system further has one or more of the inverse comb filter systems arranged between the audio signal source and the signal input of the sound source for delivering a modified signal to the electrical signal input of the sound source. The signal supplied to the subtraction circuit by the modifying signal part may be filtered by use of the one or more inverse comb filter functions.