Sub-band periodic signal enhancement system
First Claim
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1. A signal enhancement system, comprising:
- a delay logic circuit configured to receive an input signal and generate a delayed signal;
an adaptive filter circuit coupled with the delay logic circuit and configured to receive the delayed signal and generate an output signal based on the delayed signal and filter coefficients of the adaptive filter circuit, where the adaptive filter circuit is configured to adapt the filter coefficients based on a difference between the output signal and the input signal; and
a reinforcement logic circuit coupled to the adaptive filter circuit, where the reinforcement logic circuit is configured to add the input signal and the output signal from the adaptive filter circuit to increase a first periodic signal component in the input signal that is at least partially in-phase with a second periodic signal component in the output signal.
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Abstract
A signal enhancement system reinforces signal content and improves the signal-to-noise ratio of a signal. The system detects, tracks, and reinforces non-stationary periodic signal components of a signal. The periodic signal components may represent vowel sounds or other voiced sounds. The system may detect, track, and attenuate quasi-stationary signal components in the signal.
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Citations
23 Claims
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1. A signal enhancement system, comprising:
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a delay logic circuit configured to receive an input signal and generate a delayed signal; an adaptive filter circuit coupled with the delay logic circuit and configured to receive the delayed signal and generate an output signal based on the delayed signal and filter coefficients of the adaptive filter circuit, where the adaptive filter circuit is configured to adapt the filter coefficients based on a difference between the output signal and the input signal; and a reinforcement logic circuit coupled to the adaptive filter circuit, where the reinforcement logic circuit is configured to add the input signal and the output signal from the adaptive filter circuit to increase a first periodic signal component in the input signal that is at least partially in-phase with a second periodic signal component in the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for enhancing a signal, comprising:
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delaying an input signal to generate a delayed signal; adaptively filtering the delayed signal, by an adaptive filter implemented in hardware or executed by a processor, to generate an output signal based on the delayed signal and filter coefficients of the adaptive filter; adapting the filter coefficients of the adaptive filter based on a difference between the output signal and the input signal; and reinforcing the input signal with the output signal to generate a reinforced signal, where the act of reinforcing comprises adding the input signal and the output signal from the adaptive filter to increase a first periodic signal component in the input signal that is at least partially in-phase with a second periodic signal component in the output signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A machine-readable non-transitory medium having processor-executable instructions to enhance a signal by performing the acts of:
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delaying an input signal to generate a delayed signal; adaptively filtering the delayed signal to generate an output signal based on the delayed signal and filter coefficients of an adaptive filter; adapting the filter coefficients of the adaptive filter based on a difference between the output signal and the input signal; and reinforcing the input signal with the output signal to generate a reinforced signal, where the act of reinforcing comprises adding the input signal and the output signal from the adaptive filter to increase a first periodic signal component in the input signal that is at least partially in-phase with a second periodic signal component in the output signal. - View Dependent Claims (22, 23)
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Specification