Speech synthesis apparatus, electronic watermark information detection apparatus, speech synthesis method, electronic watermark information detection method, speech synthesis program, and electronic watermark information detection program

摘要

A digital watermark information detecting apparatus, a speech synthesizing method, a digital watermark information detecting method, a speech synthesizing program, and a digital watermark information detecting program capable of inserting a digital watermark without deteriorating the quality of synthesized speech. The information processing apparatus according to the embodiment includes a sound source generation unit, a phase modulation unit, and a vocal tract filter unit. The sound source generation unit generates a sound source signal using the basic frequency sequence of speech and the pulse signal. The phase modulation unit modulates the phase of the pulse signal for each pitch mark based on the digital watermark information with respect to the sound source signal generated by the sound source generation unit. The vocal tract filter unit generates a speech signal using a spectral parameter sequence for a sound source signal in which the phase modulation unit modulates the phase of the pulse signal.