Patent ID: 9414156
Filing Date: 2016-08-09
CPC Classification: H04R

Claim Text:
1. A method comprising processing an input audio signal to reduce total harmonic distortion of the input audio signal when the audio signal is reproduced by a loudspeaker, said loudspeaker being located within an audio reproduction device having an enclosure with an associated resonant frequency, said method including steps of: (a) receiving said input audio signal, which includes the resonant frequency of the enclosure, and wherein said input audio signal is represented by digital samples which are a time-domain representation of said input audio signal; (b) performing a Fourier transform to produce a frequency-domain representation of said input audio signal; (c) reducing, in the frequency domain, the level of said input audio signal at the resonant frequency of the enclosure, thereby producing a first processed signal; (d) reducing, in the frequency domain, the level of said input audio signal at all frequencies, thereby producing a second processed signal; (e) combining, in the frequency domain, said first processed signal and said second processed signal; (f) performing an inverse Fourier transform to produce a time-domain output audio signal.