Method of changing a pitch of a VCV phoneme-chain waveform and apparatus of synthesizing a sound from a series of VCV phoneme-chain waveforms
First Claim
1. A pitch changing method of a VCV phoneme-chain waveform, comprising the steps of:
- producing a composite pitch pattern of an artificial waveform of a composite sound indicating characters written in a text, the composite pitch pattern being drawn in plane co-ordinates of a pitch frequency and a time;
specifying a VCV phoneme-chain portion of the composite pitch pattern corresponding to a VCV phoneme chain composed of a preceding vowel, a consonant and a succeeding vowel;
producing a pitch pattern of a VCV phoneme-chain waveform of the VCV phoneme chain from an actual voice sample;
defining an inclination of a straight line connecting a transitional portion of the preceding vowel and a transitional portion of the succeeding vowel in the plane co-ordinates as an overall inclination of a pitch pattern of a waveform corresponding to the VCV phoneme chain;
changing a pitch of the VCV phoneme-chain waveform to form a changed pitch pattern of the VCV phoneme-chain waveform while making the overall inclination of the changed pitch pattern of the VCV phoneme-chain waveform agree with the overall inclination of the VCV phoneme-chain portion of the composite pitch pattern and overlapping the transitional portion of the preceding vowel in the changed pitch pattern of the VCV phoneme-chain waveform with that in the VCV phoneme-chain portion of the composite pitch pattern; and
adopting the changed pitch pattern of the VCV phoneme-chain waveform as a pitch pattern of a waveform corresponding to the VCV phoneme chain.
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Accused Products
Abstract
A composite pitch pattern of an artificial waveform of a composite sound indicating characters is produced according to a general pitch pattern producing model, and a pitch pattern of a VCV phoneme-chain waveform of each of VCV phoneme-chains corresponding to the characters is produced from an actual voice sample. Each VCV phoneme-chain composed of a preceding vowel, a consonant and a succeeding vowel has a pitch fine structure and a pitch fluctuation. Thereafter, an overall inclination of the pitch pattern of each VCV phoneme-chain waveform is adjusted to that of a portion of the composite pitch pattern corresponding to the-same VCV phoneme-chain to overlap transitional portions of preceding and succeeding vowels in a changed pitch pattern of each VCV phoneme-chain waveform with those in the corresponding portion of the composite pitch pattern. Therefore, when changed pitch patterns of the VCV phoneme-chain waveforms are connected with each other, a synthesized sound of the characters can be obtained while the synthesized sound maintains a pitch fine structure and a pitch fluctuation.
15 Citations
6 Claims
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1. A pitch changing method of a VCV phoneme-chain waveform, comprising the steps of:
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producing a composite pitch pattern of an artificial waveform of a composite sound indicating characters written in a text, the composite pitch pattern being drawn in plane co-ordinates of a pitch frequency and a time; specifying a VCV phoneme-chain portion of the composite pitch pattern corresponding to a VCV phoneme chain composed of a preceding vowel, a consonant and a succeeding vowel; producing a pitch pattern of a VCV phoneme-chain waveform of the VCV phoneme chain from an actual voice sample; defining an inclination of a straight line connecting a transitional portion of the preceding vowel and a transitional portion of the succeeding vowel in the plane co-ordinates as an overall inclination of a pitch pattern of a waveform corresponding to the VCV phoneme chain; changing a pitch of the VCV phoneme-chain waveform to form a changed pitch pattern of the VCV phoneme-chain waveform while making the overall inclination of the changed pitch pattern of the VCV phoneme-chain waveform agree with the overall inclination of the VCV phoneme-chain portion of the composite pitch pattern and overlapping the transitional portion of the preceding vowel in the changed pitch pattern of the VCV phoneme-chain waveform with that in the VCV phoneme-chain portion of the composite pitch pattern; and adopting the changed pitch pattern of the VCV phoneme-chain waveform as a pitch pattern of a waveform corresponding to the VCV phoneme chain. - View Dependent Claims (2, 3)
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4. A sound synthesizing apparatus comprising:
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storing means for storing a large number of VCV phoneme-chain waveforms of VCV phoneme-chains produced from actual voice samples, each VCV phoneme-chain being composed of a preceding vowel, a consonant and a succeeding vowel; receiving means for receiving characters written in a text; VCV phoneme-chain determining means for determining a string of particular VCV phoneme-chains corresponding to the characters received by the receiving means; composite pitch pattern producing means for producing a composite pitch pattern of an artificial waveform of a composite sound corresponding to the characters according to the string of particular VCV phoneme-chains determined by the VCV phoneme-chain determining means; VCV phoneme-chain waveform selecting means for selecting a series of particular VCV phoneme-chain waveforms corresponding to the string of particular VCV phoneme-chains determined by the VCV phoneme-chain determining means from the VCV phoneme-chain waveforms stored in the storing means; pitch changing means for changing a pitch of each particular VCV phoneme-chain waveform selected by the VCV phoneme-chain waveform selecting means to form a changed pitch pattern of the particular VCV phoneme-chain waveform while making an overall inclination of the changed pitch pattern of the particular VCV phoneme-chain waveform agree with an overall inclination of a portion of the composite pitch pattern produced by the composite pitch pattern producing means and overlapping a transitional portion of the preceding vowel in the changed pitch pattern of the particular VCV phoneme-chain waveform with that in the portion of the composite pitch pattern; VCV phoneme-chain waveform connecting means for connecting the changed pitch patterns of the particular VCV phoneme-chain waveforms obtained by the pitch changing means with each other while overlapping a transitional portion of a succeeding vowel of a first particular VCV phoneme-chain waveform with a transitional portion of a preceding vowel of a second particular VCV phoneme-chain waveform following the first particular VCV phoneme-chain waveform for each particular VCV phoneme-chain waveform to produce a synthesized pitch pattern of a synthesized waveform of a synthesized sound; and synthesized sound outputting means for outputting the synthesized sound produced by the VCV phoneme-chain waveform connecting means. - View Dependent Claims (5, 6)
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Specification