Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2011 - zeszyt 5

Automatic prosodic modification in a Text-To-Speech synthesizer of polish language

nr katalogowy: 59596

Speech synthesis plays an important part in human-computer interaction. Communication by voice is more likely to reach the attention of the user than text messages displayed on the screen. The voice messages generated by the synthesizer need to be intelligible and sound naturally. Unnatural sound of synthesized speech is likely to be annoying to the user and can worsen the comfort of working with the application. The synthesizer described in the paper is used as a part of an application based on eye tracking technology [1, 10]. Concatenative synthesis using diphones is employed. The advantage of such method is low database size and high intelligibility. However, the naturalness of diphone synthesis is not perfect. An utterance obtained simply by concatenation of segments without any modification is often perceived as flat and unnatural. The cause of such unnaturalness is the lack of prosody. In natural language people often tend to react to prosodic features of speech, such as intonation or accent, rather than to the actual content. Therefore, it is necessary to improve the naturalness by changing the prosodic features of the synthesized voice message. Automatic modification of prosody in a Text-To-Speech system is a process which requires two stages: automatic determination of prosodic features and the modification of speech segments, forcing the desired features on the synthesized speech. Both stages are described closer in the following subsections. With the use of the described methods a more natural speech can be obtained, whose prosodic features match those of natural spoken language. The implementation of prosody also improves the functionality of human-computer communication. By changing the intonation, accent or tempo, voice messages generated in the applications can be distinguished as statements, questions, commands etc. To assess the effectiveness of the proposed modifications, auditory tests were conducted. It w[...]

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2011-5

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