Measuring and improving speech intelligibility in an enclosure
First Claim
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1. A method for adjusting spectral characteristics of a signal, comprising:
- measuring an audio signal;
calculating an index indicative of speech intelligibility of the audio signal;
comparing the index to a threshold value; and
when the index does not exceed the threshold value;
determining whether a gain of an input signal can be increased; and
when the gain of the input signal cannot be increased;
modifying a spectral shape of the input signal.
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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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Citations
20 Claims
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1. A method for adjusting spectral characteristics of a signal, comprising:
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measuring an audio signal; calculating an index indicative of speech intelligibility of the audio signal; comparing the index to a threshold value; and when the index does not exceed the threshold value; determining whether a gain of an input signal can be increased; and when the gain of the input signal cannot be increased; modifying a spectral shape of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for estimating and improving speech intelligibility over a prescribed region in an enclosure, comprising:
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a plurality of microphones for receiving an audio signal; a plurality of speakers for generating an output signal from an input signal; and a uniform speech intelligibility controller coupled to the microphones and the speakers, the uniform speech intelligibility controller including; a beamformer configured to receive a modified input signal, redistribute sound energy of the received input signal, and communicate signals indicative of the redistributed sound energy to the speakers; a plurality of speech intelligibility estimators each coupled to at least one of the microphones and configured to estimate a speech intelligibility at the corresponding at least one microphone; a speech intelligibility spatial distribution mapper coupled to the speech intelligibility estimators and configured to map the estimated speech intelligibilities across a desired region; and a beamformer filter coefficient computation module coupled to the speech intelligibility spatial distribution mapper and configured to adjust filter coefficients of the beamformer for sound energy redistribution. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification