A vocoder-based speech synthesis system, named WORLD, was developed in an effort to
improve the sound quality of real-time applications using speech. Speech analysis …

An algorithm is proposed for estimating the band aperiodicity of speech signals, where
“aperiodicity” is defined as the power ratio between the speech signal and the aperiodic …

A spectral envelope estimation algorithm is presented to achieve high-quality speech
synthesis. The concept of the algorithm is to obtain an accurate and temporally stable …

A fundamental frequency (F0) estimator named Harvest is described. The unique points of
Harvest are that it can obtain a reliable F0 contour and reduce the error that the voiced …

This paper presents a novel statistical singing voice conversion (SVC) technique with direct
waveform modification based on the spectrum differential that can convert voice timbre of a …

This paper describes an evaluation of a temporally stable spectral envelope estimator
proposed in our past research. The past research demonstrated that the proposed algorithm …

This paper introduces singing information processing, which is defined as music information
processing for singing voices. As many people listen to music with a focus on singing …

The perceived age of a singing voice is the age of the singer as perceived by the listener,
and is one of the notable characteristics that determines perceptions of a song. In this paper …

We propose human-in-the-loop (HITL) speech-design system with an interface. General text-
to-speech (TTS) systems generate the speech waveform from the input text without the need …

We describe an implementation of real-time waveform generation from vocoded speech
parameters. High-quality vocoders such as STRAIGHT and WORLD have been used for …