MEASURING AND IMPROVING SPEECH INTELLIGIBILITY IN AN ENCLOSURE
First Claim
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1. A method for determining a shape of a spectral mask, comprising:
- determining a prescribed distortion level of the spectral mask;
determining a prescribed average gain of the spectral mask; and
maximizing an index indicative of speech intelligibility of an audio signal subject to the prescribed distortion level of the spectral mask and the prescribed average gain of the spectral mask.
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Abstract
A method for accurately estimating and improving the speech intelligibility from a loudspeaker (LS) is disclosed. A microphone is placed in a desired position and using an adaptive filter, an estimate of the clean speech signal at the microphone is generated. By using the adaptive-filter estimate of the clean speech signal and measuring the background noise in the enclosure an accurate Speech Intelligibility Index (SII) or Articulation Index (AI) measurement at the microphone position is obtained. On the basis of the estimated speech intelligibility measurement, a decision can be made if the LS signal needs to be modified to improve the intelligibility.
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20 Claims
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1. A method for determining a shape of a spectral mask, comprising:
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determining a prescribed distortion level of the spectral mask; determining a prescribed average gain of the spectral mask; and maximizing an index indicative of speech intelligibility of an audio signal subject to the prescribed distortion level of the spectral mask and the prescribed average gain of the spectral mask. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining an index indicative of speech intelligibility of an audio signal, comprising:
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estimating background noise of the audio signal; estimating an average speech spectrum of the audio signal based on coefficients of a subband adaptive filter that represents a channel between a loudspeaker generating a source audio signal and a microphone measuring the audio signal; and computing the index based on the estimated background noise and the estimated average speech spectrum. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification