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Audio signal processing apparatus and a sound emission apparatus

  • US 10,405,089 B2
  • Filed: 02/12/2018
  • Issued: 09/03/2019
  • Est. Priority Date: 08/13/2015
  • Status: Active Grant
First Claim
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1. An audio signal processing apparatus for processing an input audio signal, the audio signal processing apparatus comprising:

  • a plurality of filters, each filter configured to filter the input audio signal to obtain a plurality of filtered audio signals, each filter designed according to an extended mode matching beamforming applied to a surface of a half revolution, the surface partially characterizing a loudspeaker enclosure shape;

    a plurality of scaling components, each scaling component configured to scale the plurality of filtered audio signals using a plurality of gain coefficients to obtain a plurality of scaled filtered audio signals; and

    a plurality of adders, each adder configured to combine the plurality of scaled filtered audio signals, so as to provide an output audio signal for producing a sound field having a beam directivity pattern defined by the plurality of gain coefficients, where the filters use a function describing a radiation polar pattern of a transducer array conforming to the surface of a full revolution comprising the surface of a half revolution.

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