Speech synthesizer, audio watermarking information detection apparatus, speech synthesizing method, audio watermarking information detection method, and computer program product

A speech synthesizing method comprising:

• generating a source signal by using a fundamental frequency sequence and a pulse signal;
• modulating, with respect to the generated source signal, a phase of the pulse signal at each pitch mark based on audio watermarking information;
• and
• generating a speech signal by using a spectrum parameter sequence with respect to the source signal in which the phase of the pulse signal is modulated.

A non-transitory computer readable recording medium for recording program to cause a computer to execute a speech synthesizing method in a computer, the method comprising the steps of:

• generating a source signal by using a fundamental frequency sequence and a pulse signal;
• modulating, with respect to the generated source signal, a phase of the pulse signal at each pitch mark based on audio watermarking information;
• and
• generating a speech signal by using a spectrum parameter sequence with respect to the source signal in which the phase of the pulse signal is modulated.