NON-SPATIAL SPEECH DETECTION SYSTEM AND METHOD OF USING SAME
First Claim
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3-1. A non-spatial speech detection system as in claim 1, wherein the plurality of microphones receive speech emanating from a driver or front seat passenger in a vehicle.
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Abstract
A non-spatial speech detection system includes a plurality of microphones whose output is supplied to a fixed beamformer. An adaptive beamformer is used for receiving the output of the plurality of microphones and one or more processors are used for processing an output from the fixed beamformer and identifying speech from noise though the use of an algorithm utilizing a covariance matrix.
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Citations
20 Claims
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3-1. A non-spatial speech detection system as in claim 1, wherein the plurality of microphones receive speech emanating from a driver or front seat passenger in a vehicle.
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7. A non-spatial speech detection system comprising:
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a plurality of microphones; and at least one processor for processing at least one real audio signal received by the plurality of microphones so that the real audio signal is processed by formatting each frequency band of the plurality of complex frequency bands into a covariance matrix having a plurality of covariance matrix elements and calculating a determinant for each of the covariance matrix elements to provide a speech presence metric to utilize the speech presence metric for identifying speech within the at least one real audio signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A non-spatial speech detection system comprising:
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a plurality of microphones located in a vehicle; and at least one processor for processing at least one real audio signal received by the plurality of microphones wherein the at least one real audio signal is processed using the steps of; transforming each frame of the real audio signal into a plurality of complex bands using a fast Fourier transform; formatting each band of the plurality of complex bands into a covariance matrix having a plurality of matrix elements; calculating a determinant from the plurality of covariance matrix elements to provide a speech presence metric; transforming the speech presence metric into a gain function; calculating a fast average value and slow average value from the gain function; and utilizing an input signal and the gain function for identifying speech within the at least one real audio signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification