Abstract: This application relates to a method of synthesizing a speech of which a speed and a pitch are changed. In one aspect, the method includes a spectrogram may be generated by performing a short-time Fourier transformation on a first speech signal based on a first hop length and a first window length, and speech signals of sections having a second window length at the interval of a second hop length from the spectrogram. A ratio between the first hop length and the second hop length may be set to be equal to the value of a playback rate and a ratio between the first window length and the second window length may be set to be equal to the value of a pitch change rate, thereby generating a second speech signal of which the speed and the pitch are changed.

Abstract: A computer-implemented method of generating speech training data is proposed. The method may include generating, at a processor, a recording script corresponding to particular text. The method may also include generating, at the processor, recorded data by performing recording by a speaker based on the recording script. The method may further include labeling, at the processor, the recorded data. Various embodiments can generate a large amount of speech training data for training an artificial neural network model while minimizing a worker's inconvenience and time consumption.

Abstract: A method of synthesizing speeches by scoring the speeches is proposed. The method may include generating a spectrogram based on utterer information and a text and generating a plurality of sub-speeches corresponding to the spectrogram. The method may also include selecting one of the plurality of sub-speeches and generating a final speech by using the selected sub-speech.

Abstract: This application relates to a speech synthesis system. In one aspect, the system includes an encoder configured to generate a speaker embedding vector corresponding to a verbal speech based on a first speech signal corresponding to a verbal utterance. The system may also include a synthesizer configured to perform at least once the cycle including generating a plurality of spectrograms corresponding to verbal utterance of the sequence of the text, based on the speaker embedding vector and a sequence of a text written in a particular natural language and selecting a first spectrogram from among the spectrograms, to output the first spectrogram. The system may further include a vocoder configured to generate a second speech signal corresponding to the sequence of the text based on the first spectrogram.

Abstract: This application relates to a method of synthesizing a speech of which a speed and a pitch are changed. In one aspect, the method includes a spectrogram may be generated by performing a short-time Fourier transformation on a first speech signal based on a first hop length and a first window length, and speech signals of sections having a second window length at the interval of a second hop length from the spectrogram. A ratio between the first hop length and the second hop length may be set to be equal to the value of a playback rate and a ratio between the first window length and the second window length may be set to be equal to the value of a pitch change rate, thereby generating a second speech signal of which the speed and the pitch are changed.