Signalverarbeitungsverfahren und Systeme für Adaptive Strahlenformung

Details

Veröffentlichungs-Nr.

EP3764660

Aktenzeichen

EP19185514

Anmeldetag

10. Juli 2019

Veröffentlichung

30. August 2023

Erteilung

30. August 2023

Rechtsraum

EP

IPC

H04R3/00G10L21/0216G10L21/02G10L21/0208G10L21/0232H04R1/40

Abstract

A method and apparatus are provided for adaptively generating a directional output signal from sound received by at least two microphones arranged as microphone array. The method includes transforming the sound received by each of the microphones and represented by analog-to-digital converted time-domain signals into corresponding complex-valued frequency-domain microphone signals each having a frequency component value for each of a plurality of frequency components, calculating from the complex-valued frequency-domain microphone signals a Beam Focus Spectrum by means of an Adaptive Spectrum that is calculated as quotient of conditionally updated moving temporal averages of complex-valued products of frequency-domain microphone signals, said Beam Focus Spectrum comprises, for each of the plurality of frequency components, a time-dependent, real-valued attenuation factor, multiplying, for each of the plurality of frequency components, the attenuation factor with the frequency component value of the complex-valued frequency-domain microphone signal to obtain a directional frequency component value, and forming a frequency-domain directional output signal.

Anmelder

Firma

Analog Devices International Unlimited Company

Land

🇮🇪 Irland

Fachgebiete