Method and apparatus for identifying sound in a composite sound signal
First Claim
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1. A method of identifying a sound in a composite sound signal, comprising the steps of:
- converting said composite sound signal to an electrical signal;
decomposing said electrical signal using a wavelet transform to produce a plurality of sets of wavelet coefficients, each set of wavelet coefficients corresponding to a respective time-versus-frequency span;
determining a respective statistical parameter for each set of wavelet coefficients;
re-synthesizing an impulsive signal using an inverse wavelet transform applied to selected ones of said sets of wavelet coefficients, said selected ones being selected in response to said respective statistical parameters; and
comparing said impulsive signal with a plurality of reference signals to classify said sound with respect to said reference signals.
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Abstract
Impulsive sound components in a composite sound signal are separated using wavelet analysis and sorting of wavelet coefficient sets according to statistical parameters of each respective coefficient set. Each entire coefficient set is either included or excluded from each respective separated component based on the statistical parameter. Once the impulsive sound component is isolated, it is compared with reference sound information in order to classify the sound according to its potential causes.
59 Citations
14 Claims
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1. A method of identifying a sound in a composite sound signal, comprising the steps of:
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converting said composite sound signal to an electrical signal;
decomposing said electrical signal using a wavelet transform to produce a plurality of sets of wavelet coefficients, each set of wavelet coefficients corresponding to a respective time-versus-frequency span;
determining a respective statistical parameter for each set of wavelet coefficients;
re-synthesizing an impulsive signal using an inverse wavelet transform applied to selected ones of said sets of wavelet coefficients, said selected ones being selected in response to said respective statistical parameters; and
comparing said impulsive signal with a plurality of reference signals to classify said sound with respect to said reference signals. - View Dependent Claims (2, 3, 4, 5)
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6. A method of identifying a sound in a composite sound signal, comprising the steps of:
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converting said composite sound signal to an electrical signal;
decomposing said electrical signal using a wavelet transform to produce a plurality of sets of wavelet coefficients, each set of wavelet coefficients corresponding to a respective time-versus-frequency span;
determining a respective statistical parameter for each set of wavelet coefficients;
identifying selected sets of wavelet coefficients as impulsive sets in response to said respective statistical parameters; and
comparing said impulsive sets with a plurality of reference sets of wavelet coefficients to classify said sound with respect to said reference sets of wavelet coefficients, wherein each reference set of wavelet coefficients corresponds to a respective sound classification. - View Dependent Claims (7, 8, 9, 10)
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11. Apparatus for identifying a sound in a composite sound signal, comprising the steps of:
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a transducer converting said composite sound signal to an electrical signal;
a wavelet transformer decomposing said electrical signal into a plurality of wavelet coefficient sets;
a statistical parameter calculator calculating a statistical parameter for each wavelet coefficient set;
a separator forming an impulsive group of wavelet coefficient sets in response to said statistical parameters;
an inverse wavelet transformer for synthesizing an impulsive signal from said impulsive group of wavelet coefficient sets; and
a classifier comparing said impulsive signal with a plurality of reference signals to classify said sound with respect to said reference signals. - View Dependent Claims (12, 13, 14)
statistics means for determining statistical parameters of said impulsive signal; and
comparing means for comparing said determined statistical parameters with statistical parameters of said reference signals.
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14. The apparatus of claim 11 wherein said classifier is comprised of a neural network.
Specification