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Design and Build of a Multi-Zone Beamforming Speaker
(2025-01-01)
Tontiwattanakul, Khemapat
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Sueprasert, Jiraphat
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Nawik, Dech
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Thumwarin, Pitak
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Chitanont, Nachanant
Recently, beamforming speaker for multi-zone sound production is an application that is of interest such as conference system, public address, home cinema, and gaming. This paper presents a design of a speaker array and DS beamforming aiming to use for product advertising such that the speaker can be installed on the shelf. The limit of the space and the usable frequency range are the challenges of this work. The design of the speaker cabinet and the beamforming algorithm will be discussed.
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Lombard Speech in Noise and Reverberation between Thai and English
(2024-01-01)
Chaisittirerkkul, Channakan
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Chitanont, Nachanant
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Hodoshima, Nao
In large indoor public spaces such as train stations, airports, hospitals, and shopping malls, the public address (PA) system transfers an important announcement whether during normal or emergencies. At times, the announcement made through the PA system was not intelligible enough to understand due to reverberation, echoes, and environmental noise (i.e., airplanes, trains, cars, and noise from humans) in the spaces, especially for older adults, people with hearing-related diseases, or non-native listeners. This study investigates whether adapting the Lombard effect to simulate an indoor PA system environment affects speech intelligibility in Thai and English. Sentences have been recorded with normal and Lombard speech in Thai and English. Eighteen Thai-native speakers between 19 and 23 years old participated in this experiment. The statistical result showed that adapting the Lombard effect to simulate an announcement in a large indoor PA system has no statistically significant difference in speech intelligibility compared to normal speech; no statistically significant interaction between language and speaking condition; and a statistically significant difference between Thai and English on speech intelligibility. Future research will aim to make the stimuli more realistic, explore different speaking styles, and speakers (male or female).
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Deep Neural Networks for Sound Synthesis of Thai Duct F1ute, Khlui
(2021-04-01)
Sinjankhom, Tantep
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Chivapreecha, Sorawat
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Chitanont, Nachanant
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Kato, Tomonori
This paper introduces Thai musical instrument sound synthesis with an intelligent technique which is a combination of deep neural networks and conventional signal processing techniques. The instrument focused on in this paper is the Khlui, which is a unique Thai reedless wind instrument. Khlui sound can be synthesized by performing a combination of additive and subtractive syntheses. The synthesis system takes the pitch and loudness of any monophonic input signal. Then, multilayer perceptron and recurrent neural networks are used together in order to generate 3 parameters which are harmonic distribution, filter magnitude response, and the signal envelope. Finally, the harmonic characteristic of the Khlui along with the blowing noises are highly synthesized. The results are natural-sounding and realistic when compared with the recorded Khlui audio. This research will contribute to the more convenient natural synthesis of the Khlui sounds.
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Noise reduction by spatio-temporal filtering on parallel phase-shifting interferometry
(2020-07-01)
Chitanont, Nachanant
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Thongtangsai, Pannarong
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Tachatanachai, Dabasvee
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Chatsuksiridech, Praewa
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Imaeda, Fumihiko
Visualizing sound field is important to fully understand the acoustic behavior and phenomena. Recently, sound field visualization by using parallel phase-shifting interferometer (PPSI) has been proposed. PPSI can observe sound field quantitively and instantaneously without placing any object inside the field. However, the system has introduced some unwanted noise to the output fringe image. There is continuous development in signal processing method to reduce the noise in PPSI system. In this paper, different type of spatio-temporal filter has been tested to improve noise reduction in PPSI system upon establishing.
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Acoustical analysis of the thai duct flute, Khlui
(2020-07-01)
Chitanont, Nachanant
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Padthong, Padcharawan
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Sinpru, Bhumrape
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Sriseang, Nutwarot
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Thumwarin, Pitak
The purpose of this paper is to study the acoustical model of the Thai traditional duct flute, khlui. The relation between physical characteristics of the flute, such as acoustic length, playing hole, temperature effect, etc., and the frequency of each musical note of khluis is investigated. First, the fundamental frequencies of each finger hole of 10 khluis are measured. Then, data between the ideal musical notes and measured notes of khlui are analysed. The results indicate that the production process of khlui still has limits in accuracy. Finally, in order to develop a production standard of the Thai duct flute, a model of khlui is designed. The musical notes of the designed flute are measured. The accuracy of the designed flute is investigated to support the understanding of its acoustical model.

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