Naotoshi Osaka - Academia.edu (original) (raw)

Papers by Naotoshi Osaka

IEICE Technical Report; IEICE Tech. Rep., Feb 21, 2020

IEICE Technical Report; IEICE Tech. Rep., Feb 21, 2020

IEICE Technical Report; IEICE Tech. Rep., Jul 12, 2012

Acoustical Science and Technology, Feb 1, 2001

International Computer Music Conference, 1995

International Computer Music Conference, 2007

Genesynth is an analysis/synthesis framework that uses a genetic algorithm to search for a noise ... more Genesynth is an analysis/synthesis framework that uses a genetic algorithm to search for a noise band sound model. The framework is written as an open source C++ tool, which allows for both the modification and resynthesis of found sound models and also genealogical exploration of the generations of sound variations created as a side effect of the genetic algorithm. The genetic algorithm used is specialized for the problem of audio analysis by using variable chromosome length as well as hierarchical chromosome structure. The algorithm's fitness function compares cached and compressed FFT data against estimated noise band models represented in the chromosomes. The noise band model is synthesized using sinusoids that are stochastically modulated in frequency to achieve a flexible bandwidth.

Behavior Research Methods, Instruments, & Computers, 1994

An inexpensive PC-based moving window generator with an eye movement recording system is describe... more An inexpensive PC-based moving window generator with an eye movement recording system is described. The moving window technique, activated by current eye movements, has an advantage over the fixed window technique in measuring the effective visual field size during reading. A variable rectangular window, through which the subject observes the text, is generated on a PC-controlled CRT screen. The system includes a frame buffer memory, an analog-to-digital conversion unit, and an eye movement recording system. The system works well for measuring approximate field size during reading.

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), 2020

Many methods of interpolation for the spatial impulse response have been proposed to improve the ... more Many methods of interpolation for the spatial impulse response have been proposed to improve the measurement efficiency. In this paper, we propose a method of extrapolating the room transfer functions including higher-order reflections using a small number of microphones. The direct sound and reflected sounds are represented by the sparse equivalent source method and the image source method. Experiments using a finite-difference time-domain (FDTD) simulation show that the proposed method has smaller errors than linear interpolation at low frequencies.

Acoustical Science and Technology, 1994

ITE Technical Report, 1992

Proceedings of the SMC Conferences, Jul 11, 2012

(Abstract to follow)

The visualization of the sound field which is an invisible-physical phenomena is useful for detec... more The visualization of the sound field which is an invisible-physical phenomena is useful for detection of noise sources, understanding the sound propagation, and architectural acoustics. Room Impulse Response (RIR) is widely used in various acoustic applications because RIR characterizes the sound propagation between a source and a measurement point in a room. Thus, measuring the RIRs at multiple points allows us to visualize the sound field in more detail. For example, we can observe the animation of sound wave fronts by using the RIRs at multiple points. However, many microphones and repetitive measurements are required to measure the RIRs with high resolution. In this paper, we propose a method for visualization of the sound field with high spatial resolution based on the estimation of the RIRs around the microphone using a small number of microphones. The RIRs are modeled using sparse equivalent sources and the image source methods. We conducted the evaluation experiment in an an...

NTT technical review, 2003

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), 2020

Auditory display techniques require subjective evaluations of the virtual sound field to determin... more Auditory display techniques require subjective evaluations of the virtual sound field to determine the accuracy of a reproduced sound with respect to a listener’s perception of spatial information. To synthesize a physically accurate sound field, local sound field synthesis limits the controlled area inside the loudspeaker array. The size and position of the controlled area affects the accuracy of the synthesis. In this study, we investigate the sound localization accuracies at different positions inside a 2Dimensional loudspeaker array by measurement of the interaural level differences in an anechoic chamber. The results show that the sound localization of the local sound field synthesis was more accurate than the conventional wave field synthesis, if a suitable parametrization of local listening area is chosen.

Acoustical Science and Technology, 2001

ACM SIGGRAPH 2020 Posters, 2020

In this paper, we propose a measurement and visualization system for spatial impulse responses th... more In this paper, we propose a measurement and visualization system for spatial impulse responses that utilizes a moving handy microphone and Mixed Reality (MR). By enhancing the existing visualization system of sound intensity using MR, the proposed system aids in the visualization of spatial impulse responses using the estimation based on the signal measured by a moving microphone. As the visualization of the sound field varies with time, it is effective to understand the relationship between a complicated sound field, including the reflected sounds, and the reflecting objects in a room.

IEICE Technical Report; IEICE Tech. Rep., Feb 21, 2020

IEICE Technical Report; IEICE Tech. Rep., Feb 21, 2020

IEICE Technical Report; IEICE Tech. Rep., Jul 12, 2012

Acoustical Science and Technology, Feb 1, 2001

International Computer Music Conference, 1995

International Computer Music Conference, 2007

Genesynth is an analysis/synthesis framework that uses a genetic algorithm to search for a noise ... more Genesynth is an analysis/synthesis framework that uses a genetic algorithm to search for a noise band sound model. The framework is written as an open source C++ tool, which allows for both the modification and resynthesis of found sound models and also genealogical exploration of the generations of sound variations created as a side effect of the genetic algorithm. The genetic algorithm used is specialized for the problem of audio analysis by using variable chromosome length as well as hierarchical chromosome structure. The algorithm's fitness function compares cached and compressed FFT data against estimated noise band models represented in the chromosomes. The noise band model is synthesized using sinusoids that are stochastically modulated in frequency to achieve a flexible bandwidth.

Behavior Research Methods, Instruments, & Computers, 1994

An inexpensive PC-based moving window generator with an eye movement recording system is describe... more An inexpensive PC-based moving window generator with an eye movement recording system is described. The moving window technique, activated by current eye movements, has an advantage over the fixed window technique in measuring the effective visual field size during reading. A variable rectangular window, through which the subject observes the text, is generated on a PC-controlled CRT screen. The system includes a frame buffer memory, an analog-to-digital conversion unit, and an eye movement recording system. The system works well for measuring approximate field size during reading.

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), 2020

Many methods of interpolation for the spatial impulse response have been proposed to improve the ... more Many methods of interpolation for the spatial impulse response have been proposed to improve the measurement efficiency. In this paper, we propose a method of extrapolating the room transfer functions including higher-order reflections using a small number of microphones. The direct sound and reflected sounds are represented by the sparse equivalent source method and the image source method. Experiments using a finite-difference time-domain (FDTD) simulation show that the proposed method has smaller errors than linear interpolation at low frequencies.

Acoustical Science and Technology, 1994

ITE Technical Report, 1992

Proceedings of the SMC Conferences, Jul 11, 2012

(Abstract to follow)

The visualization of the sound field which is an invisible-physical phenomena is useful for detec... more The visualization of the sound field which is an invisible-physical phenomena is useful for detection of noise sources, understanding the sound propagation, and architectural acoustics. Room Impulse Response (RIR) is widely used in various acoustic applications because RIR characterizes the sound propagation between a source and a measurement point in a room. Thus, measuring the RIRs at multiple points allows us to visualize the sound field in more detail. For example, we can observe the animation of sound wave fronts by using the RIRs at multiple points. However, many microphones and repetitive measurements are required to measure the RIRs with high resolution. In this paper, we propose a method for visualization of the sound field with high spatial resolution based on the estimation of the RIRs around the microphone using a small number of microphones. The RIRs are modeled using sparse equivalent sources and the image source methods. We conducted the evaluation experiment in an an...

NTT technical review, 2003

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), 2020

Auditory display techniques require subjective evaluations of the virtual sound field to determin... more Auditory display techniques require subjective evaluations of the virtual sound field to determine the accuracy of a reproduced sound with respect to a listener’s perception of spatial information. To synthesize a physically accurate sound field, local sound field synthesis limits the controlled area inside the loudspeaker array. The size and position of the controlled area affects the accuracy of the synthesis. In this study, we investigate the sound localization accuracies at different positions inside a 2Dimensional loudspeaker array by measurement of the interaural level differences in an anechoic chamber. The results show that the sound localization of the local sound field synthesis was more accurate than the conventional wave field synthesis, if a suitable parametrization of local listening area is chosen.

Acoustical Science and Technology, 2001

ACM SIGGRAPH 2020 Posters, 2020

In this paper, we propose a measurement and visualization system for spatial impulse responses th... more In this paper, we propose a measurement and visualization system for spatial impulse responses that utilizes a moving handy microphone and Mixed Reality (MR). By enhancing the existing visualization system of sound intensity using MR, the proposed system aids in the visualization of spatial impulse responses using the estimation based on the signal measured by a moving microphone. As the visualization of the sound field varies with time, it is effective to understand the relationship between a complicated sound field, including the reflected sounds, and the reflecting objects in a room.

Contemporary Music Review vol.37, n° 1-2, February-April 2018: Electroacoustic Music in East Asia, edited by Marc Battier and Kenneth Fields, 2018

Lin-Ni Liao: "Taiwanese Women Composers of Mixed Music with Their Cultural Heritage", Electroacou... more Lin-Ni Liao: "Taiwanese Women Composers of Mixed Music with Their Cultural Heritage", Electroacoustic Music in East Asia, edited by Marc Battier and Kenneth Fields, Contemporary Music Review vol.37, n° 1-2, February-April 2018, Taylor & Francis Group, London, p. 161-173.

----- Other articles in this Book----

Twenty Years of Japanese Electroacoustic Music: Trends in 1990s and JSEM
Mikako Mizuno

Sneezing Toward the Sun: The Human Voice in the Musique concrète of Toru Takemitsu
Toshie Kakinuma

The Creative Quest into Temple Bell Sonorities: Works of Musique Concrète by Toshiro Mayuzumi
Yoshihiko Shimizu

Japanese Electroacoustic and Japanese Instruments
Hiromi Ishii

Electroacoustic Music Linked with Information Processing Research in Japan
Naotoshi Osaka

Mayuzumi’s Electronic Studies
Cathy L. Cox

The Principles of Electronic Music (1956)
Toshiro Mayuzumi (translated by Cathy L. Cox)

Electronic Music 7 Variations (1957)
Toshiro Mayuzumi (translated by Cathy L. Cox)

The Power of Arterial Language in Constructing a Musical Vocabulary of One’s Own: Inheriting the Inspiration and Gene of Innovation in Electroacoustic Music from Chinese Culture
Xiaofu Zhang

Characteristics of Early Electronic Music Composition in China’s Mainland
Qiuxiao Li

Exploration and Innovation, the Chinese Model of the Musicacoustica-Beijing Festival
Hefei Wang

Excavating the History of Electroacoustic Music in Korea, 1966– 2016
Hee Seng Kye and Jongwoo Yim