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A harmonic signal, signal technology, applied in speech analysis, speech recognition, instruments and other directions, can solve problems such as voice increase
Inactive Publication Date: 2017-12-01
弩锋股份有限公司
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For example, when a person is speaking, the fundamental freque
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[0205] Techniques for determining the properties of harmonic signals over time are described here. For example, the characteristics of the harmonic signal may be determined at regular intervals (eg, every 10 milliseconds). These properties can be used to process speech or other signals, for example as features for performing automatic speech recognition or speaker verification or identification. These properties can also be used to perform signal reconstruction to reduce the noise level of harmonic signals.
[0206] The relationship between the harmonics of the harmonic signal can be used to improve the estimation of the characteristics of the harmonic signal. For example, if the first harmonic of a harmonic signal has a frequency f and a chirp rate c, then the higher order harmonics are expected to have a frequency that is a multiple of f and a chirp rate that is a multiple of c. Techniques that exploit these relationships can provide better results than others.
[0207] H...
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Abstract
Features that may be computed from a harmonic signal include a fractional chirp rate, a pitch, and amplitudes of the harmonics. A fractional chirp rate may be estimated, for example, by computing scores corresponding to different fractional chirp rates and selecting a highest score. A first pitch may be computed from a frequency representation that is computed using the estimated fractional chirp rate, for example, by using peak-to-peak distances in the frequency distribution. A second pitch may be computed using the first pitch, and a frequency representation of the signal, for example, by using correlations of portions of the frequency representation. Amplitudes of harmonics of the signal may be determined using the estimated fractional chirp rate and second pitch. Any of the estimated fractional chirp rate, second pitch, and harmonic amplitudes may be used for further processing, such as speech recognition, speaker verification, speaker identification, or signal reconstruction.
Description
[0001] priority claim [0002] This application is based on, and claims priority to, U.S. Provisional Patent Application No. 62 / 112,836, filed February 6, 2015, entitled "Spectral Motion Transformation"; U.S. Provisional Patent Application No. 62 / 112796, filed February 6, 2015, entitled "Peak Interval Pitch Estimation"; filed February 6, 2015, entitled U.S. Provisional Patent Application 62 / 112850 for "Pitch from Symmetrical Features," and U.S. Nonprovisional Patent Application 14 / 969029 entitled "Determining Characteristics of Harmonic Signals," filed Dec. 15, 2015; Dec. 15, 2015 U.S. Nonprovisional Patent Application 14 / 969022, entitled "Estimating Pitch Using Symmetrical Features," filed on December 15, 2015, and entitled "Estimating Fractional Chirp Rate Using Multiple Frequency Representations" Application 14 / 969036; US Nonprovisional Patent Application 14 / 969038, entitled "Estimating Pitch Using Peak-to-Peak Distance," filed December 15, 2015, the contents of which are he...
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