Joko Sarwono

Modeling and Simulation of Gamelan Bali Concert Hall Based on Objective Acoustic Parameters

Gamelan Bali music performances require special place to highlight the quality of the acoustic performances. A concert hall dedicated for Gamelan Bali was proposed to perform a better acoustic quality. Studies on Gamelan Bali has been done to achieved an optimum value of sound fields in Gamelan Bali concert hall. This paper shows a geometrical model designed to fulfill the suitable sound fields of Gamelan Bali Concert Hall. The model was modified from shoebox shaped with rear and side balconies. The acoustic performances of the model at 1 kHz summarized as follows: Tsub = 1.41 s, LL = 80.2 dBA, Δt1 = 39.43 ms, and IACC = 0.33. Those values meet the optimum values from the result of previous studies. Auralization of sound in the room was also done for the purpose of subjective judgment.

Characterizing the hearing comfort in intensive care unit using objective and subjective evaluation

Hospital is a place that should be free of acoustic problems. According to previous researches, these acoustic problems are responsible for 20.9% - 26.2% of the ICU patients recovery process. A research based on soundscape of a hospital was done through objective, subjective and simulation methods. The result has shown that the most perceived loud sound is from the ventilator at 4000 Hz with loudness level of 60 phon. The L90 score is between 55-59 dBA. The Leq ranged between 50.78-67.49 dBA at the left ear and 60.07-76.55 at the right ear from the first receiver position. From the second measuring point, L10 score is around 52.08-72.19 dBA at the left ear and 61.91-78.94 at the right ear. This value indicates that the noise level in the ICU is high enough, and caused discomfort for human hearing. Installation of panels on ceiling at the nurse ward can reduce the intensity level up to 3 dBA. Meanwhile, relocation of nurse ward can reduce up to 4 dBA.

Musical gesture recognition for interactive angklung robot

Angklung is traditional musical instrument from Indonesia that is usually played by many people. In an interactive playing session, a conductor may lead the players by using a special hand sign. It would be a good idea to use the same hand sign to command a musical robot, and thus a gesture recognition system was required. The system was built based on a kinect sensor. This paper reveals how to make use the data from the sensor for faster and more reliable recognition system.

Acoustic analysis of High Care Unit (HCU) at hospital “X” in Bandung, Indonesia

Acoustical comfort in a hospital is utterly needed for improving patients recovery progress, quality of sleep, and also working quality of medical staff. A research in the study of acoustical comfort was carried out in High Care Unit (HCU) at Hospital “X”, Bandung, Indonesia. Three parameters measured and modified in this research are definition 50 (D-50), sound pressure level (SPL), and reverberation time (T-30) through simulation, actual measurement, subjective observation, and passive acoustic recommendation methods.

Simulation and analysis of acoustical comfort in an Intensive Care Unit

Acoustical comfort in a hospital is required for recovering process, improving quality of sleep, improving patients comfort factor, and also to enhance medical staffs working quality. A research related to acoustical comfort was conducted at the Intensive Care Unit (ICU) Hospital in Bandung, Indonesia. Acoustic parameters that are discussed in this paper are definition-50 (D-50), sound pressure level (SPL), and reverberation time (T-30). These parameters are measured and modified by simulation, actual measurement, subjective observation, and passive acoustic recommendation. Data from simulation shows that both T-30 and D-50 values (especially in speech frequency) are just slightly around the standard value, while simulation and actual measurement show that SPL value is above the standard of 35 dBA. On the other hand, subjective observation shows that noise sources are dominated by speech (250Hz–1,000Hz) and intermittent noise from alarm (1,000Hz–2,000Hz). Recommendation was determined through simulation by changing/coating concrete wall with fiberglass board. After recommendation, the values for D-50 and T-30 are 17.6%–88.7% and 0.3s–1.0s, respectively. For SPL (and Leq) parameter, there is a decrease of 7.7dBA (in patients area) and 2.5dBA (in nurses area). Overall, D-50 parameter is increased while both T-30 and SPL parameters are decreased, which considered better for acoustic environment in a hospital.

Acoustic Speech Analysis Of Wayang Golek Puppeteer

Active disguising speech is one problem to be taken into account in forensic speaker verification or identification processes. The verification processes are usually carried out by comparison between unknown samples and known samples. Active disguising can be occurred on both samples. To simulate the condition of speech disguising, voices of Wayang Golek Puppeteer were used. It is assumed that wayang golek puppeteer is a master of disguise. He can manipulate his voice into many different types of character’s voices. This paper discusses the speech characteristics of 2 puppeteers. Comparison was made between the voices of puppeteer’s habitual voice with his manipulated voice.