Objective measure for estimating mean opinion score of synthesized speech
First Claim
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1. A method for estimating naturalness of synthesized speech, wherein naturalness is a subjective quality of synthesized speech, the method comprising:
- generating a set of synthesized utterances from textual information;
subjectively rating each of the synthesized utterances;
calculating a score for each of the synthesized utterances using an objective measure, the objective measure being a function of textual information used to form the utterances;
ascertaining a relationship between the scores of the objective measure and subjective ratings of the synthesized utterances; and
using the relationship to estimate naturalness of synthesized speech.
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Abstract
A method for estimating mean opinion score or naturalness of synthesized speech is provided. The method includes using an objective measure that has components derived directly from textual information used to form synthesized utterances. The objective measure has a high correlation with mean opinion score such that a relationship can be formed between the objective measure and corresponding mean opinion score. An estimated mean opinion score can be obtained easily from the relationship when the objective measure is applied to utterances of a modified speech synthesizer.
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Citations
29 Claims
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1. A method for estimating naturalness of synthesized speech, wherein naturalness is a subjective quality of synthesized speech, the method comprising:
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generating a set of synthesized utterances from textual information; subjectively rating each of the synthesized utterances; calculating a score for each of the synthesized utterances using an objective measure, the objective measure being a function of textual information used to form the utterances; ascertaining a relationship between the scores of the objective measure and subjective ratings of the synthesized utterances; and using the relationship to estimate naturalness of synthesized speech. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for developing a speech synthesizer, the method comprising:
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obtaining a set of synthesized utterances based on textual information from the speech synthesizer; subjectively rating naturalness of each of the synthesized utterances; calculating a score for each of the synthesized utterances using an objective measure, the objective measure being a function of textual information of speech units for each of the utterances; ascertaining a relationship between the scores of the objective measure and ratings of the synthesized utterances; varying a parameter of the speech synthesizer; obtaining speech units for another utterance after the parameter of the speech synthesizer has been varied;
andcalculating a second score for said another utterance using the objective measure; and using the relationship and the second score to estimate naturalness of said another utterance. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification