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SIGNAL PROCESSING APPARATUS, MICROPHONE ARRAY DEVICE, AND STORAGE MEDIUM STORING SIGNAL PROCESSING PROGRAM

  • US 20110158426A1
  • Filed: 12/23/2010
  • Published: 06/30/2011
  • Est. Priority Date: 12/28/2009
  • Status: Abandoned Application
First Claim
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1. A signal processing apparatus, comprising:

  • at least two sound input units;

    an orthogonal transformer to transform two sound signals, out of sound signals in a time domain input from the at least two sound input units, into respective spectral signals in a frequency domain;

    a phase difference calculator to calculate a phase difference between the spectral signals in the frequency domain;

    a range determiner to determine a coefficient responsive to a frequency in the phase difference as a function of frequency, and determine a suppression range related to a phase on a per frequency basis of the frequency responsive to the coefficient; and

    a filter to phase-shift a component of a first of the spectral signals on a per frequency basis in order to generate a phase-shifted spectral signal when the phase difference at each frequency falls within the suppression range, synthesizing the phase-shifted spectral signal and a second of the spectral signals in order to generate a filtered spectral signal.

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