Formant frequency estimation method, apparatus, and medium in speech recognition
AssigneeSamsung Electronics Co., Ltd.
InventorsKwang Cheol Oh, Jae-Hoon Jeong, So-Young Jeong
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Abstract
A formant frequency estimation method which is important information in speech recognition by accelerating a spectrum using a pitch frequency, and an apparatus using the method is provided. That is, the formant frequency estimation method includes preprocessing an input speech signal and generating a spectrum by a fast Fourier transforming the preprocessed input speech signal; smoothing the generated spectrum; accelerating the smoothed spectrum; and determining a formant frequency on the basis of the accelerated spectrum.
Claims23
A formant frequency estimation method in speech recognition comprising:
- preprocessing an input speech signal and generating a spectrum by fast Fourier transforming the preprocessed input speech signal;
- smoothing the generated spectrum;
- accelerating the smoothed spectrum;
- and
- determining a formant frequency on the basis of the accelerated spectrum.
A formant frequency estimation method in speech recognition comprising:
- establishing a flag state backward;
- calculating an anchor parameter after preprocessing an input speech signal;
- executing buffering until the anchor parameter is above a predetermined threshold value;
- estimating a backward formant frequency after the anchor parameter is above the predetermined threshold value;
- and
- changing the flag state and establishing after estimating the backward formant frequency.
A formant frequency estimation apparatus in speech recognition comprising:
- a preprocess unit pre-processing an input speech signal;
- a fast Fourier transformation unit Fourier transforming the preprocessed input speech signal, and generating a spectrum;
- a smoothing unit smoothing the generated spectrum;
- an acceleration unit accelerating the smoothed spectrum;
- and
- a formant frequency determination unit determining a formant frequency on the basis of the accelerated spectrum.
- The apparatus of claim 11, wherein the formant frequency determining unit further comprises:
- a pitch frequency estimation unit estimating a pitch frequency of a preprocessed input speech signal, and
- wherein the smoothing unit is based on a moving average of the generated spectrum and smoothes the generated spectrum by using the number of tabs corresponding to the estimated pitch frequency.
The apparatus of claim 12, wherein the acceleration unit calculates a first spectral difference corresponding to the smoothed spectrum, smoothes a spectrum of the first spectral difference, and calculates a second spectral difference corresponding to the spectrum the smoothed first spectral difference.
A formant frequency estimation apparatus in speech recognition comprising:
- a flag state establishment unit establishing a flag state backward;
- an anchor parameter calculation unit calculating an anchor parameter after a preprocess of input speech signal;
- a buffering unit executing buffering until the anchor parameter is above a predetermined threshold value;
- a formant frequency estimation unit estimating a backward formant frequency after anchor parameter is above the predetermined threshold value;
- and
- wherein the flag state establishment unit changes and establishes the flag state after estimating the backward formant frequency.
A formant frequency estimation method in speech recognition comprising:
- calculating an anchor parameter from an input speech signal;
- executing buffering until the anchor parameter is above a predetermined threshold value;
- and
- estimating a backward formant frequency after the anchor parameter is above the predetermined threshold value.
Dependencies are inferred from the claim text.