Apparatus using missing fundamental frequencies to improve loudspeaker sound focusing

摘要

An apparatus for processing an audio signal to focus an acoustic signal by an arrangement of a plurality of loudspeakers comprises a frequency analyzer, a signal processor and a signal output interface. The acoustic signal is based on the audio signal. The frequency analyzer is configured to determine a fundamental frequency in a frequency spectrum of the audio signal depending on a geometry parameter of the arrangement of the plurality of loudspeakers. The signal processor is configured to adapt an overtone of the fundamental frequency to obtain the processed audio signal and the signal output interface is configured to output the processed audio signal to the plurality of loudspeakers.

主权项

1. An apparatus for processing an audio signal to focus an acoustic signal by an arrangement of a plurality of loudspeakers, wherein the acoustic signal is based on the audio signal, comprising:
a low-pass filter configured to attenuate frequencies higher than a low-pass cut off frequency, wherein the low-pass cut off frequency is based on a geometry parameter of the arrangement of the plurality of loudspeakers; wherein the plurality of loudspeakers is arranged in a line and the geometry parameter is equal to the distance of both outermost loudspeakers, or wherein the plurality of loudspeakers is arranged circular and the geometry parameter is equal to the diameter of the circular arrangement, a frequency analyzer configured to determine a fundamental frequency in a frequency spectrum of the audio signal depending on the geometry parameter of the arrangement of the plurality of loudspeakers; an overtone generator configured to generate an overtone of the fundamental frequency; a signal processor configured to adapt the overtone of the fundamental frequency to obtain the processed audio signal; and a signal output interface configured to output the processed audio signal to the plurality of loudspeakers.