Combinatory directional processing of sound signals
AssigneeCochlear Limited
InventorStefan Jozef Mauger
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Abstract
Presented herein are techniques for generating a combinatory microphone signal from sounds captured at a microphone array. More specifically, sound signals captured by a microphone array are used to generate first and second directional signals. A cross-power signal is computed from the first and second directional signals. The cross-power signal is converted into an amplitude domain output signal, and a phase of the amplitude domain output signal is reconstructed in order to generate a combinatory microphone signal that is useable for subsequent sound processing operations.
Claims36
A method, comprising:
- determining a plurality of first frequency components associated with a first directional microphone signal;
- determining a plurality of second frequency components associated with a second directional microphone signal;
- multiplying the first frequency components with the second frequency components to generate a cross-power signal;
- and
- converting the cross-power signal to an amplitude domain to generate an amplitude domain combinatory microphone signal.
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A method, comprising:
- receiving sound signals at a microphone array comprising first and second microphones positioned along a microphone axis;
- generating first and second directional signals from the sound signals received at the microphone array;
- calculating a frequency element wise multiplication of the first and second directional microphone signals, in the frequency domain;
- generating an magnitude domain signal from the frequency element wise multiplication of the first and second directional microphone signals, in the frequency domain cross power spectrum;
- and
- reconstructing a phase of the magnitude domain signal to generate an amplitude combinatory microphone signal.
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An auditory prosthesis, comprising:
- a microphone array comprising first and second microphones positioned along a microphone axis;
- a directional pre-processing module configured to generate first and second directional signals from the sound signals received at the microphone array;
- and
- a combinatory processing module configured to:
- calculate a magnitude signal from a frequency element wise cross power spectrum of the first and second directional microphone signals, in the frequency domain, and
- constructing a combinatory microphone signal from the magnitude signal and a phase signal.
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Dependencies are inferred from the claim text.