Ryohei Nakatsu

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Verified

Ryohei verified their affiliation via an institutional email.

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• Bachelor of Science, Master of Science, PhD
• Professor (Adjunct) at Kyoto University

This chapter briefly overviews the history of computer music languages and related systems, mainly focusing on those developed in the research community (hence, less focus is put on those commercial computer music software such as digital audio workstation (DAW) software or sound editor software). As is often seen in other surveys of computer music...

This paper describes how the short-term Fourier transform (STFT) and inverse short-term Fourier transform (ISTFT) are integrated within the sound synthesis framework of LC, a new computer music programming language, which the authors prototyped, and discusses its benefits for computer music programming. In addition to the traditional unit-generator...

This chapter briefly overviews the history of computer music languages and related systems, mainly focusing on those developed in the research community (hence, less focus is put on those commercial computer music software such as digital audio workstation (DAW) software or sound editor software). As is often seen in other surveys of computer music...

This article describes the design of a framework for sound synthesis in LC, a new computer music language we prototyped, together with concrete code examples. Unlike existing unit-generator languages, LC provides objects as well as library functions and methods that can directly represent microsounds and related manipulations that are involved in m...

This chapter briefly overviews the history of computer music languages and related systems, mainly focusing on those developed in the research community (hence, less focus is put on those commercial computer music software such as digital audio workstation (DAW) software or sound editor software). As is often seen in other surveys of computer music...

Conversation with computers is an important form of human computer interaction. Inappropriately designed conversational agents can easily lead to unsatisfying user experience and even frustration, and this is especially true when the application is deployed in the real world. Currently, research on casual non-task oriented systems and our understan...

This paper describes LC, a new computer music programming language currently under development. LC is a strongly-timed prototype-based programming language for live computer music with lightweight concurrency and lexical closure, the design of which takes the emergence of live-coding performance on laptop computers into consideration as a significa...

In this paper, we describe a novel programming model for microsound synthesis techniques in LCSynth, a strongly-timed sound synthesis language, with concrete examples in granular synthesis and waveset synthesis. Instead of encapsulating microsound synthesis techniques inside unit-generators, LCSynth provides objects and manipulations for microsound...

With the rapidly advancing information society, it is important to realize a balance between material and mental richness. It is deeply absorbed in new forms of entertainment based on technical innovation, but the feeling of absorption exert on people is unclear. Recently, the word 'Game Brain' has become popular in Japan. Examining the cause of th...

In this paper, we describe a visual recognition system of the audience's reactions for multi-point tel-conferences. The system, which works in real-time, can recognize and evaluate some reactions of the audience. It is mainly composed of three subsystems. The first subsystem is a detection and tracking system which is used to detect face and hands...

A viewer usually does not perceive everything in a picture. The objects in the picture that the viewer perceives depend on the structures in the view, the meanings of the objects, the mental condition of the viewer, and so on. If it is assumed that the impressions of the viewer are determined by what objects he or she pays attention to, highly attr...

This paper discusses the effect of various acoustic transmission characteristics from speech recognition viewpoints. The reflection properties of a solid wall can be approximated by an electric filter simulation. The simulation experiments show that the 3 kHz dip caused by acoustic transmission considerably degrades speech recognition accuracy. Thi...

Speech is a faster and easier method of inputting Japanese text than typing. This paper describes a method for converting monosyllable recognition results into Kanji-Kana representation. The results of a performance test are also given. This method has two features: (1) Several recognition candidates are used when converting into Japanese text, bec...

Parallel processor architecture for continuous speech recognition based on the DTW (Dynamic Time Warping) algorithm has been investigated. In designing this processor, the major effort has been focused on both achieving sufficient operation performance and designing a processor suitable for the algorithm. A sophisticated example shows that the arch...

Equipment is described which can recognize an utterance by any user without the necessity to register the voice, and its performance is not affected by the user's sex, age nor by the telephone set used. A large amount of speech data, uttered by many males and females, ranging in age from their twenties to fifties, was collected. Telephone sets used...

An acoustic processor in a conversational speech recognition system is described. The main features of the processor are: Effective feature extraction on the maximum-likelihood analysis basis; Top-down method adoption in the phoneme recognition stage; Adaptability to a new speaker by learning vowel reference patterns; High speed processing utilizin...