Periodic signal enhancement system
First Claim
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1. A signal enhancement system comprising:
- a signal input;
delay logic coupled to the signal input;
an adaptive filter coupled to the delay logic; and
reinforcement logic implemented in hardware or executed by a processor, where the reinforcement logic is coupled to the adaptive filter and the signal input to add an output of the adaptive filter to an input signal received on the signal input 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 of the adaptive filter.
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Abstract
A signal enhancement system improves the understandability of speech or other audio signals. The system reinforces selected parts of the signal, may attenuate selected parts of the signal, and may increase SNR. The system includes delay logic, an adaptive filter, and signal reinforcement logic. The adaptive filter may track one or more fundamental frequencies in the input signal and outputs a filtered signal. The filtered signal may approximately reproduce the input signal approximately delayed by an integer multiple of the signal'"'"'s fundamental frequencies. The reinforcement logic combines the input signal and the filtered signal output to produce an enhanced signal output.
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Citations
43 Claims
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1. A signal enhancement system comprising:
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a signal input; delay logic coupled to the signal input; an adaptive filter coupled to the delay logic; and reinforcement logic implemented in hardware or executed by a processor, where the reinforcement logic is coupled to the adaptive filter and the signal input to add an output of the adaptive filter to an input signal received on the signal input 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 of the adaptive filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A signal enhancement system comprising:
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a signal input; means for delaying an input signal received through the signal input; means for adaptively filtering the delayed signal to obtain a filtered output signal; and means for reinforcing the input signal with the filtered output signal by adding the filtered output signal to the input signal 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 filtered output signal, where the means for reinforcing is implemented in hardware or executed by a processor. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for enhancing a signal, comprising:
receiving an input signal;
delaying the input signal to obtain a delayed signal;
applying an adaptive filter to the delayed signal to obtain a filtered output signal, where the adaptive filter is implemented in hardware or executed by a processor; and
reinforcing the input signal with the filtered output signal by adding the filtered output signal to the input signal 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 filtered output signal.- View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A product comprising:
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a machine readable medium; and machine readable instructions embodied on the machine readable medium that; delay an input signal to obtain a delayed signal; apply an adaptive filter to the delayed signal to obtain a filtered output signal; and reinforce the input signal with the filtered output signal by adding the filtered output signal to the input signal 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 filtered output signal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification