Periodic signal enhancement system
First Claim
1. A signal enhancement system comprising:
- a signal input;
partitioned delay logic coupled to the signal input;
a partitioned adaptive filter coupled to the partitioned delay logic and comprising multiple adaptive filter outputs;
filter reinforcement logic coupled to the adaptive filter outputs;
gain logic coupled to the filter reinforcement logic; and
signal reinforcement logic coupled to the signal input and the gain logic and comprising an enhanced signal output.
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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, a partitioned adaptive filter, and signal reinforcement logic. The partitioned adaptive filter may track and enhance the fundamental frequency and harmonics in the input signal. The partitioned filter output signals may approximately reproduce the input signal, delayed by an integer multiple of the period of the fundamental frequency of the input signal. The reinforcement logic combines the input signal and the filtered signals to produce an enhanced output signal.
131 Citations
47 Claims
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1. A signal enhancement system comprising:
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a signal input;
partitioned delay logic coupled to the signal input;
a partitioned adaptive filter coupled to the partitioned delay logic and comprising multiple adaptive filter outputs;
filter reinforcement logic coupled to the adaptive filter outputs;
gain logic coupled to the filter reinforcement logic; and
signal reinforcement logic coupled to the signal input and the gain logic and comprising an enhanced signal output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A signal enhancement system comprising:
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means for receiving an input signal;
means for delaying the input signal by multiple different delays;
means for partitioned adaptive filtering the input signal based on the multiple different delays; and
means for reinforcing the input signal with a partitioned adaptive filtering output. - View Dependent Claims (17, 18, 19)
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20. A signal enhancement system comprising:
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a signal input;
an M1 sample delay coupled to the signal input;
an M2 sample delay coupled to the M1 sample delay;
a first adaptive filter coupled to the M1 sample delay and comprising a first filter output;
a second adaptive filter coupled to the M2 sample delay and comprising a second filter output;
filter reinforcement logic connected to the first filter output and the second filter output; and
signal reinforcement logic connected to the signal input and the filter reinforcement logic. - View Dependent Claims (21, 22, 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 comprising a fundamental frequency;
delaying the input signal by multiple different sample delays to obtain multiple differently delayed input signals;
applying a partitioned adaptive filter comprising multiple individual adaptive filters to the multiple differently delayed input signals;
generating a filtered output with the partitioned adaptive filter, the filtered output approximately delayed by an integer multiple of the fundamental frequency;
generating an error signal for each of the multiple individual adaptive filters;
adapting each of the individual adaptive filters based on the error signal for that individual adaptive filter; and
reinforcing the input signal with the filtered output. - View Dependent Claims (32, 33, 34, 35, 36)
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37. 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 comprising a fundamental frequency by multiple sample delays to obtain multiple differently delayed input signals;
apply a partitioned adaptive filter comprising multiple individual adaptive filters to the multiple delayed input signals;
generate a filtered output with the partitioned adaptive filter, the filtered output approximately delayed by an integer multiple of the fundamental frequency; and
reinforce the input signal with the output estimate. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification