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US 2016/0019878 A1Published application
Audio signal processing methods and systems
OwnerMatthew Browninventor
Life of this patent
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Abstract
Described are methods and systems of identifying one or more fundamental frequency component(s) of an audio signal. The methods and systems may include any one or more of an audio event receiving step, a signal discretization step, a masking step, and/or a transcription step.
Claims28
A method of identifying at least one fundamental frequency component of an audio signal, the method comprising:
- (a) filtering the audio signal to produce a plurality of sub-band time domain signals;
- (b) transforming a plurality of sub-band time domain signals into a plurality of sub-band frequency domain signal by mathematical operators;
- (c) summing together a plurality of sub-band frequency domain signals to yield a single spectrum;
- (d) calculating the bispectrum of a plurality of sub-band time domain signals;
- (e) summing together the bispectra of a plurality of sub-band time domain signals;
- (f) calculating the diagonal of a plurality of the summed bispectra;
- (g) multiplying the single spectrum and the diagonal of the summed bispectra to produce a product spectrum;
- and
- (h) identifying at least one fundamental frequency component of the audio signal from the product spectrum or information contained in the product spectrum.
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A computer-readable medium for identifying at least one fundamental frequency component of an audio signal or audio event, the computer-readable medium comprising:
- code components configured to enable a computer to perform a method of identifying at least one fundamental frequency component of an audio signal, the method comprising:
- (a) filtering the audio signal to produce a plurality of sub-band time domain signals;
- (b) transforming a plurality of sub-band time domain signals into a plurality of sub-band frequency domain signals by mathematical operators;
- (c) summing together a plurality of sub-band frequency domain signals to yield a single spectrum;
- (d) calculating the bispectrum of a plurality of sub-band time domain signals;
- (e) summing together the bispectra of a plurality of sub-band time domain signals;
- (f) calculating the diagonal of a plurality of the summed bispectra;
- (g) multiplying the single spectrum and the diagonal of the summed bispectra to produce a product spectrum;
- and
- (h) identifying at least one fundamental frequency component of the audio signal from the product spectrum or information contained in the product spectrum.
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Dependencies are inferred from the claim text.