Kittimathaveenan, Kajornsak

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Kittimathaveenan, Kajornsak
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kajornsak.ki@kmitl.ac.th

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    Experimental study on sound characteristics of Ja-Khay strings
    (2019-07-01)
    Wangwiwattana, Teerawat
    ;
    Saguanrum, Sayam
    ;
    Kittimathaveenan, Kajornsak
    ;
    Pinsopon, Unnat
    This research explored sound characteristics of eight different strings on Ja-Khay, a Thai classical floor zither. The strings were investigated the suitability of being the first brightest string. Physical properties of each string such as linear density, elastic modulus and tension required to make a 262 Hz C<inf>4</inf>-note sound were tested and measured. The sound produced by each string was recorded in the recording studio of Music Engineering and Multimedia Department, King Mongkut's Institute of Technology Ladkrabang. Temporal and spectral responses of the sound produced by eight test strings were analyzed. The relationship between physical properties and sound characteristics such as maximum loudness, sustain, richness and brightness of the sound was investigated. The good sound characteristics of three most well-liked strings according to the survey: Construction string number 120, tennis string and Saw-U silk string, were confirmed by the analytical data.
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    Resonance in vocal techniques analysis
    (2018-08-13)
    Kittimathaveenan, Kajornsak
    ;
    Thumwarin, Pitak
    ;
    Pakalong, Nattaporn
    ;
    Nundrakwang, Songmoung
    Singers, especially when they start training, tend to have many questions concerning how to control their body as a musical instrument in order to create the sound they want. The fact that we humans can speak since birth does not mean that everyone can also control their vocal tract to make satisfactory singing sounds. Indeed, some people do not fully understand which organs are involved in the production of human speaking and singing sounds. To effectively teach singers, it is necessary to encourage them to observe the relationship between the voice organ and the sound they hear. This helps them understand which organs produce their singing voice as opposed to everyday speaking sounds. In this study, signal processing principles were used to analyze singing voices with the aim of helping singers and teachers to easily understand the principles of voice production, and with a focus on the effect of singing with nasal resonance. To fulfill this study, singing sounds were recorded and then processed to display the sound spectrum (amplitude of sound at different frequencies). In addition, the relationship between the voice production and the associated sounds were graphically analyzed.
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    Music recommendation based on color
    (2020-07-01)
    Kittimathaveenan, Kajornsak
    ;
    Pongskul, Chanathip
    ;
    Mahatanarat, Salisa
    This study presents an alternative way in choosing songs based on a selection of colors through Color-to-Music application. There were three stages of this study: The first stage was the preparation music library of the association between color and emotion; and the association between music and emotion. Library data used for the Hue, Saturation, and Value (HSV) color model creation were: Hue to represent musical instruments, Saturation referred to tempo, and Value was key (pitch). Second stage was to create two types of graphical user interface (GUI) for color selection. The last stage was to collect data from 120 participants participating in the trials. This study focused on two questions. First was the accuracy rate of a recommended song that matched selected colors. Second was to find the most suitable GUI that provides the highest accuracy rate to the recommendation of songs. The tests were divided into two groups: test A and test B. As for test A, participants started a trial by choosing color from the application; while test B would start by selecting an initial emotion, and then choosing colors to match the chosen emotions. The results showed that the overall accuracy rate of test A is higher than test B and the slider GUI has the highest accuracy rate.
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    Exploring the effects of room acoustics on soprano singers’ vocal performance in three virtual venues
    (2024-01-01)
    Park, Munhum
    ;
    Kittimathaveenan, Kajornsak
    In previous research, efforts have been made to understand the relationship between acoustic attributes of performance spaces and subjective/objective assessments of musicians’ performances. While some studies suggested a correlation between performance or note duration and reverberation time, prior findings have been inconsistent and often lacked statistical significance, primarily due to experimental design constraints or small sample sizes. In this study, 15 soprano singers participated in a series of repeated performances of two songs in three virtual venues simulated by using a real-time auralization system with a head-mounted display. Close-up recordings of the singers’ performances were analyzed, extracting various audio features for comparison across venues with reverberation times ranging from approximately 0.3 to 3.5 seconds. Results from repeated-measure ANOVA indicated that: 1) there was a marginal increase in rest duration with higher reverberation time, albeit statistically insignificant; 2) singers exhibited slightly louder and more resonant performances in a purpose-built music hall compared to smaller/larger venues; 3) increased reverberation seemed to correlate with decreased pitch accuracy and reduced use of vibrato and tremolo in certain notes. Future research aims to explore the interaction between venue characteristics and musical repertoire in more detail.
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    The influence of stage acoustics on the singers’ performance and perception: A pilot study
    (2021-01-01)
    Kittimathaveenan, Kajornsak
    ;
    Park, Munhum
    It is known that musicians tend to adjust their performance to the acoustical properties of the hall as they perceive. In a large reverberant hall, for example, they may play staccato notes even shorter than they would in a less reverberant hall to make the music more clearly understandable by the audience. In this study, four singers were invited to sing two (slow and fast) pieces of music in three venues, of which the reverberation times were 0.3, 1.8, and 3.4 seconds. Singers were surveyed with questions regarding the tempo, intonation, resonance and diction of their performance in each venue. Also, the singing voice was recorded by using a headset microphone and analyzed to relate the audio features to the characteristics of the venues. The results showed that the singers’ perception of the vocal resonance was significantly related to the venue (p = 0.024), and so were the average sound level and the dynamic range of the sound level (p = 0.040 for both dependent variables), which could partly be explained in relation to the reverberation time.