Method of detecting acoustic signal
AssigneeNippon Telegraph and Telephone Corporation
InventorYutaka Kaneda
Life of this patent
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Abstract
According to a method of detecting an acoustic signal, first and second sound receiving units are located at substantially the same position and are used to output signals having different target signal power to noise power ratios (S/N ratios). When a difference between the powers of the signals output from the first and second sound receiving units or a ratio of the power of the signal from the first sound receiving unit to that from the second sound receiving unit in a given period falls within a predetermined range, reception of the target signal within the given period is discriminated. The first sound receiving unit is an adaptive microphone array capable of controlling directivity characteristics in correspondence with a noise position.
Claims5
A method of detecting an acoustic signal, comprising the steps of:
- using first and second sound receiving units, located at the same position and having different directivity characteristics, for outputting signals having different target signal power to noise power ratios;
- and
- when a difference between logarithmic powers of said signals output from said first and second sound receiving units in a given period falls within a predetermined range, determining reception of the target signal within the given period, and
- using said first sound receiving unit in the form of an adaptive microphone array for controlling directivity characteristics in correspondence with a noise position.
Dependencies are inferred from the claim text.