Synthesis unit selection apparatus and method, and storage medium
First Claim
1. A synthesis unit selection apparatus comprising:
- obtaining means for obtaining a string of synthesis units to one or more orders, which satisfies received strings, based upon a minimum distortion standard, wherein the string of synthesis units is obtained by concatenating stored synthesis units, and the minimum distortion standard determines an order of distortion values that are produced upon obtaining the string of synthesis units from the stored synthesis units; and
selection means for selecting a synthesis unit to be stored in a memory based on the string of synthesis units obtained by said obtaining means, wherein at least one of a concatenation distortion and a modification distortion is produced, the concatenation distortion being produced upon concatenating a synthesis unit to another synthesis unit, and the modification distortion being produced upon modifying a synthesis unit, and wherein said obtaining means determines the modification distortion by looking up a table that stores the modification distortion.
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Abstract
Input text data undergoes language analysis to generate prosody, and a speech database is searched for a synthesis unit on the basis of the prosody. A modification distortion of the found synthesis unit, and concatenation distortions upon connecting that synthesis unit to those in the preceding phoneme are computed, and a distortion determination unit weights the modification and concatenation distortions to determine the total distortion. An Nbest determination unit obtains N best paths that can minimize the distortion using the A* search algorithm, and a registration unit determination unit selects a synthesis unit to be registered in a synthesis unit inventory on the basis of the N best paths in the order of frequencies of occurrence, and registers it in the synthesis unit inventory.
275 Citations
15 Claims
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1. A synthesis unit selection apparatus comprising:
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obtaining means for obtaining a string of synthesis units to one or more orders, which satisfies received strings, based upon a minimum distortion standard, wherein the string of synthesis units is obtained by concatenating stored synthesis units, and the minimum distortion standard determines an order of distortion values that are produced upon obtaining the string of synthesis units from the stored synthesis units; and
selection means for selecting a synthesis unit to be stored in a memory based on the string of synthesis units obtained by said obtaining means, wherein at least one of a concatenation distortion and a modification distortion is produced, the concatenation distortion being produced upon concatenating a synthesis unit to another synthesis unit, and the modification distortion being produced upon modifying a synthesis unit, and wherein said obtaining means determines the modification distortion by looking up a table that stores the modification distortion. - View Dependent Claims (2, 3, 4, 5, 12, 13)
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6. A synthesis unit selection method comprising:
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an obtaining step of obtaining a string of synthesis units to one or more orders, which satisfies received strings, based upon a minimum distortion standard, wherein the string of synthesis units is obtained by concatenating stored synthesis units, and the minimum distortion standard determines an order of distortion values that are produced upon obtaining the string of synthesis units from the stored synthesis units; and
a selection step of selecting a synthesis unit to be stored in a memory based on the string of synthesis units obtained in said obtaining step, wherein at least one of a concatenation distortion and a modification distortion is produced, the concatenation distortion being produced upon concatenating a synthesis unit to another synthesis unit, and the modification distortion being produced upon modifying a synthesis unit, and wherein in said obtaining step, the modification distortion is determined by looking up a table that stores the modification distortion. - View Dependent Claims (7, 8, 9, 10, 11, 14, 15)
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Specification