SPEECH SPEED CONVERSION FACTOR DETERMINING DEVICE, SPEECH SPEED CONVERSION DEVICE, PROGRAM, AND STORAGE MEDIUM
First Claim
1. A speech speed conversion factor determining device for determining adaptive conversion factors for speech speed of an input signal, comprising:
- a physical index calculation unit including;
a sound/silence judgment unit configured to distinguish between sound intervals and silent intervals of the input signal;
a fundamental frequency calculation unit configured to calculate a fundamental frequency of the input signal in the sound interval at given time intervals and to determine stable intervals in which change in values of the fundamental frequency is within a predetermined variation range and unstable intervals in which change in the values of the fundamental frequency exceeds the predetermined variation range;
a frequency smoothing unit configured to smooth a time variation of the fundamental frequency in the stable interval;
a pseudo fundamental frequency calculation unit configured to calculate, for the unstable interval and the silent interval, a pseudo fundamental frequency by interpolating a fundamental frequency with reference to values of the smoothed fundamental frequency in the stable interval; and
a fundamental frequency general shape connection unit configured to connect the smoothed fundamental frequency and the pseudo fundamental frequency to obtain sampled values of a general shape of a continuous fundamental frequency;
the physical index calculation unit being configured to output the sampled values of the general shape of the fundamental frequency as a physical index; and
a speech speed conversion factor designation unit configured to calculate speech speed conversion factors to be designated for the input signal based on the physical index.
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Accused Products
Abstract
A speech speed conversion factor determining device has a physical index calculation unit including a sound/silence judgment unit that distinguishes between sound and silent intervals of an input signal, a fundamental frequency calculation unit that calculates a fundamental frequency of the signal in the sound intervals and determines stable and unstable intervals, a frequency smoothing unit that smoothes the fundamental frequency in the stable intervals, a pseudo fundamental frequency calculation unit that calculates, for the intervals, a pseudo fundamental frequency by interpolation , and a fundamental frequency general shape connection unit that connects the smoothed and pseudo frequencies to obtain sampled values of a general shape of the frequency, such that the sampled values are output as an index, based on which conversion factor are calculated.
29 Citations
11 Claims
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1. A speech speed conversion factor determining device for determining adaptive conversion factors for speech speed of an input signal, comprising:
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a physical index calculation unit including; a sound/silence judgment unit configured to distinguish between sound intervals and silent intervals of the input signal; a fundamental frequency calculation unit configured to calculate a fundamental frequency of the input signal in the sound interval at given time intervals and to determine stable intervals in which change in values of the fundamental frequency is within a predetermined variation range and unstable intervals in which change in the values of the fundamental frequency exceeds the predetermined variation range; a frequency smoothing unit configured to smooth a time variation of the fundamental frequency in the stable interval; a pseudo fundamental frequency calculation unit configured to calculate, for the unstable interval and the silent interval, a pseudo fundamental frequency by interpolating a fundamental frequency with reference to values of the smoothed fundamental frequency in the stable interval; and a fundamental frequency general shape connection unit configured to connect the smoothed fundamental frequency and the pseudo fundamental frequency to obtain sampled values of a general shape of a continuous fundamental frequency; the physical index calculation unit being configured to output the sampled values of the general shape of the fundamental frequency as a physical index; and a speech speed conversion factor designation unit configured to calculate speech speed conversion factors to be designated for the input signal based on the physical index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A program for causing a computer, configured as a speech speed conversion factor determining device for determining adaptive conversion factors for speech speed of an input signal, to perform the steps of:
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distinguishing between sound intervals and silent intervals of the input signal; calculating a fundamental frequency of the input signal in the sound interval at given time intervals and determining stable intervals in which change in values of the fundamental frequency is within a predetermined variation range and unstable intervals in which change in the values of the fundamental frequency exceeds the predetermined variation range; smoothing time variations of the fundamental frequency in the stable intervals; calculating, for the unstable intervals and the silent intervals, pseudo fundamental frequencies by interpolating fundamental frequencies with reference to values of the smoothed fundamental frequency in the stable intervals; connecting the smoothed fundamental frequency and the pseudo fundamental frequency to obtain sampled values of a general shape of a continuous fundamental frequency; and calculating speech speed conversion factors to be designated for the input signal in accordance with the sampled values of the general shape of the fundamental frequency. - View Dependent Claims (11)
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Specification