Advanced periodic signal enhancement
AssigneeHaman Becker Automotive Systems - Wavemakers, Inc.
InventorsRajeev Nongpiur, Phillip Hetherington
Life of this patent
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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.
Claims20
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.
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 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.
A method of enhancing the perceptual quality of a processed speech segment, comprising:
- 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.
Dependencies are inferred from the claim text.