Method and device for estimating a pattern in a signal
First Claim
1. A method for estimating a fundamental frequency pattern in a signal having a periodic, quasi-periodic or virtually periodic component, operable in a processing system, the method comprising:
- transforming, by the processing system, the signal from a time-domain to a frequency-domain to obtain a spectrum of the signal,processing, by the processing system, the spectrum to obtain a zero-phase spectrum of the signal,transforming, by the processing system, a positive portion of the zero-phase spectrum of the signal to the time-domain to obtain a correlation signal,multiplying, by the processing system, the spectrum and the correlation signal to a combined spectrum, andestimating, by the processing system, the fundamental frequency pattern of the signal based on the combined spectrum.
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Abstract
The present invention relates to a method for estimating a pattern, in particular a pitch and/or a fundamental frequency, in a signal having a periodic, quasiperiodic or virtually periodic component, wherein the signal is transformed from a time-domain to a frequency-domain to obtain a spectrum of the signal, the spectrum is processed to obtain a zero-phase spectrum of the signal, the spectrum of the signal is transformed to the time-domain to obtain a correlation signal, the spectrum and the correlation signals are combined to a combined spectrum, and the pattern is estimated on the basis of the combined spectrum.
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Citations
15 Claims
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1. A method for estimating a fundamental frequency pattern in a signal having a periodic, quasi-periodic or virtually periodic component, operable in a processing system, the method comprising:
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transforming, by the processing system, the signal from a time-domain to a frequency-domain to obtain a spectrum of the signal, processing, by the processing system, the spectrum to obtain a zero-phase spectrum of the signal, transforming, by the processing system, a positive portion of the zero-phase spectrum of the signal to the time-domain to obtain a correlation signal, multiplying, by the processing system, the spectrum and the correlation signal to a combined spectrum, and estimating, by the processing system, the fundamental frequency pattern of the signal based on the combined spectrum.
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2. A device for estimating a pitch pattern in a signal having a periodic, quasi-periodic or virtually periodic component, the device comprising:
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a processing unit in communication with a memory, the memory include code which when assessed by the processing unit causes the processing unit to; transform the signal from a time-domain to a frequency-domain to obtain a spectrum of the signal by performing a Fourier Transform of the signal, process the spectrum to obtain a zero-phase spectrum of the signal by a DC notch filter transform a positive portion of the spectrum of the signal to the time-domain to obtain a correlation signal by performing an Inverse Fourier Transform, combine the spectrum and the correlation signal to obtain a combined spectrum by multiplying the spectrum and the correlation signal and estimate the pitch pattern of the signal based on the combined spectrum. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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3. A non-transitory memory, the memory modified by encoding with a computer code, the computer code causing a computer to carry out the method of:
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transforming, by the computer, the signal from a time-domain to a frequency-domain to obtain a spectrum of the signal, processing, by the computer, the spectrum to obtain a zero-phase spectrum of the signal, transforming, by the computer, a positive portion of the zero-phase spectrum of the signal to the time-domain to obtain a correlation signal, multiplying, by the computer, the spectrum and the correlation signal to a combined spectrum, and estimating, by the computer, the pitch pattern of the signal based on the combined spectrum.
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Specification