Periodic signal enhancement system
First Claim
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 coupled to the adaptive filter and the signal input.
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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
51 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 coupled to the adaptive filter and the signal input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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; and
means for reinforcing the input signal with the filtered output signal. - View Dependent Claims (18, 19, 20, 21)
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22. A signal enhancement system comprising:
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a signal input;
frequency tracking logic coupled to the signal input and comprising an output, the frequency tracking logic operable to output a fundamental frequency of an input signal;
an adder coupled to the signal input and the output that reinforces the input signal with the fundamental frequency. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for enhancing a signal, comprising:
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receiving an input signal;
delaying the input signal;
estimating periodicity in the input signal based on a delayed signal; and
reinforcing the input signal with the delayed signal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. 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;
estimate periodicity in the input signal based on a delayed signal; and
reinforce the input signal with the delayed signal. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification