Speech synthesis apparatus

Abstract

An audio synthesis device capable of embedding additional information which cannot be modified into a synthesis audio without causing audio quality deterioration or band limit includes: a language processing unit (201) for generating synthesized audio generation information required for creating a synthesized audio according to a character string; a prosody generation unit (202) for generating an audio prosody information according to the synthesized audio generation information; and a waveform generation unit (203) for synthesizing audio according to the prosody information. The prosody generation unit (202) embeds code information as watermark information into the prosody information in the area of a predetermined time width not exceeding the phoneme length containing a phoneme boundary.

Description

technical field [0001] The present invention relates to a sound synthesis device, in particular to a sound synthesis device capable of embedding information. Background technique [0002] With the development of digital signal processing technology in the past, in order to prevent the illegal copying of audio data, especially music data, and protect copyright, a technology that uses phase modulation, echo signal or auditory masking technology to embed information that does not affect audiovisual (transparent) has been developed. Way. In these methods, information is embedded after creating audio data as content, and the information is read out by a playback device to ensure that only legitimate right holders can use the content. [0003] As for voice, there is not only voice data produced by a human voice but also voice data produced by so-called voice synthesis. With the remarkable progress of the so-called voice synthesis technology that synthesizes voice from text strin...

AI Technical Summary

Problems solved by technology

Therefore, in the transmission line where the bandwidth of transmission such as telephone lines is limited to the main frequency band of the sound signal, there is a possibility that additional information will be lost during the transmission process or additional information will be added to the band that is not lost, that is, the sound signal within the main frequency band, there is a possibility of causing serious deterioration in sound quality

[0014] In addition, the conventional method of deforming a specific cycle of a waveform when synchronizing a cycle of a waveform with a tone mark is not affected by the frequency band of the transmission line, but it must be limited to a short time unit of one cycle. Control, and the amount of deformation of the waveform must also be a small deformation that is not perceived by people as deteriorating the sound quality and is not noticed by people. Therefore, there is a possibility that additional information may be lost or lost during the process of digital / analog conversion or transmission. Problems Buried in Signal Noise

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