Advanced periodic signal enhancement
First Claim
1. An enhancement speech system that improves the perceptual quality of a processed speech segment, comprising:
- a discrete input;
a delay unit that digitally delays a signal received through the discrete input;
a spectral modifier coupled to the delay unit programmed to substantially flatten the spectral character of a background noise;
an adaptive filter coupled to the spectral modifier that adapts filter characteristics to match a response to the signal received through the discrete input before the signal is delayed; and
a programmable filter coupled to the delay unit having a transfer function functionally related to a transfer function of the adaptive filter.
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Abstract
An enhancement system improves the perceptual quality of a processed speech. The system includes a delay unit that delays a signal received through a discrete input. A spectral modifier linked to the delay unit is programmed to substantially flatten the spectral character of a background noise. An adaptive filter linked to the spectral modifier adapts filter characteristics to match a response of a non-delayed signal. A programmable filter is linked to the delay unit. The programmable filter has a transfer function functionally related to a transfer function of the adaptive filter.
171 Citations
20 Claims
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1. An enhancement speech system that improves the perceptual quality of a processed speech segment, comprising:
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a discrete input;
a delay unit that digitally delays a signal received through the discrete input;
a spectral modifier coupled to the delay unit programmed to substantially flatten the spectral character of a background noise;
an adaptive filter coupled to the spectral modifier that adapts filter characteristics to match a response to the signal received through the discrete input before the signal is delayed; and
a programmable filter coupled to the delay unit having a transfer function functionally related to a transfer function of the adaptive filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An enhancement speech system that improves the perceptual quality of a processed speech segment, comprising:
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a discrete input;
a delay unit that digitally delays a discrete signal received through the discrete input;
a spectral modifier coupled to the delay unit programmed to substantially flatten a portion of the spectral character of a detected background noise;
an adaptive filter coupled to the spectral modifier that adapts coefficients to match a response to the signal received through the discrete input before the signal is delayed; and
a programmable filter coupled to the delay unit having a transfer function functionally related to a transfer function of the adaptive filter. - View Dependent Claims (15, 16, 17, 18, 20)
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19. A method of enhancing the perceptual quality of a processed speech segment, comprising:
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delaying an input signal;
modifying the spectral characteristic of the input signal by substantially flattening the spectral characteristics of a background noise;
adapting the coefficients of a filter to match the response of the input signal;
adapting the coefficients of a programmable filter so that the transfer function of the programmable filter is functionally related to the transfer function of the filter.
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Specification