Analisis Perbandingan Tingkat Tekanan Bunyi Terhadap Sistem Pembangkit Suara Akustik dengan Efek Surround dan Tanpa Efek Surround

<em>This study aims to determine the comparison of the sound pressure level produced by an acoustic sound generator system with surround effects without surround effects. Acoustic sound generating system with surround effects is designed and made as a sound system that produces a surround effect where the resulting sound is divided and distributed over two or many channels (multi channel). This sound system consists of four parts, namely: front cannel, rear surround channel, extra rear channel and subwoofer. This system gets input from the VCD in the form of R and L signals into the AN7397K IC then comes out through four output channels. Each output channel is connected to a 150 watt stereo and mono power amplifier. From the results of research with statistical tests using the t distribution shows that there is a difference in sound pressure level (SPL) between acoustic sound generating systems with surround effects without surround effects at a distance of 1 meter to 10 meters, where the value of the sound pressure level with a sound generator system is obtained. acoustics with a surround effect higher than the sound pressure level without a surround effect</em>

Sound Generator: Analysis of the Effectiveness of Noise in the Habituation of Tinnitus

Introduction Tinnitus is a disorder that affects 10 to 15% of de world's population. Sound therapy performed through hearing aids (HAs) with integrated sound generator (SG) is one of the forms of tinnitus treatment. Objective To analyze the effectiveness of four masking noises in relieving tinnitus in individuals with mild and moderate bilateral sensorineural hearing loss and their influence in speech perception. Methods The participants were 35 individuals with tinnitus and mild and moderate bilateral sensorineural hearing loss, divided into four groups. All groups underwent HA and SG adaptation, being regulated in the combined mode (HA and SG). In group 1 (G1), the white noise stimulus was applied, in group 2 (G2), pink noise was applied, in group 3 (G3), speech noise, and in group 4 (G4), the high tone was applied. All patients were subjected to the following procedures: audiological diagnosis, acuphenometry, tinnitus handicap inventory (THI), visual analogue scale (VAS), and hearing in noise test (HINT). The procedures were performed prior to and after hearing intervention, and after 3 months of use of HA and SG. Results All groups presented a statistically significant difference for the THI, VAS, and HINT pre and postintervention. In the case of the HINT, only pink noise presented a significant difference. However, in the comparation among groups there was no significant difference. Conclusion The present study made it possible to conclude that the four noises were equally effective in relieving tinnitus, with no statistically significant differences between the analyzed groups.

Simple Experiment of Doppler Effect Using Smartphone Microfon Sensor

Doppler effect is the physical phenomena in which the emitted frequency is a source of change at a time when accepted by the detector due to relative movement of the detector towards the source of the wave or vice versa. This research aims to identify the Doppler effect symptoms by utilizing sensors found in smartphones. This research uses experimental method that combine the mechanical instruments and microphone smartphone sensor as measurement tool. The mechanical instruments used are a smartphone with the help of frequency sound generator software, Physics Toolbox, the camera as an instrument of data collectors, and Tracker as a motion analyzer software. Based on the results of the experiments, the author retrieved the value of the error and the standard deviation of each of the observed symptoms. The symptoms of Doppler effect upon source moving closer and moving away when the silent observer shows the error value of 0.04 % and 0.1185 % respectively with a standard deviation of 0.018 and 1.005. In addition, the experiment on Doppler effect as the source is staying still and as the observer approaching the source provides error value of 8.60 % and standard deviation of 13.501. As for the experiment on Doppler effect as the source and the observers are approaching each other displays the error value of 4.31 % and the standard deviation of 0.087. Overall, this experiment generates error value of 3.267 % and standard deviation of 3.665, inferring that the experiments conducted are accurate and precise in representing the Doppler effect phenomenon. Based on the results of this experiments, the researcher recommends to carry out practicum on Doppler effects with the help of smartphone sensors.

An Efficiency Study of the Aerodynamic Sound Generators Suitable for Acoustic Particle Agglomeration

The object of this study is the acoustic field generated by aerodynamic acoustic generators of various types and designs. Six types of aerodynamic acoustic generators were studied experimentally and theoretically to determine the parameters of their generated acoustic field. It was established that the aerodynamic Hartmann type sound generator produces the necessary for acoustic particle agglomeration acoustic field and can be used in acoustic air cleaning equipment. It was established that classical theoretical calculation methods underestimate the design features of aerodynamic acoustic generators and cannot be used to calculate their characteristics.

Survey of Hardware and Software Design Approaches for Mechatronic Chordophones

Mechatronic instruments can create complex sounds that computers and digital instruments have yet to offer. As a specific example, we explore mechatronic chordophones, which use strings as a sound generator and offer a wide array of parametric affordances. The purpose of this work is to review recent approaches for chordophone design and construction, and present current, state-of-the-art devices. We explore multiple mechatronic frames and their components, and we analyze the challenges of building and interacting with these machines. Finally, we review software and hardware approaches that have been implemented to enhance these instruments and to bridge technical and creative restrictions.

Utilização de apps para o ensino do efeito Doppler

O ensino e aprendizado de física faz parte de um importante processo que possibilita ao indivíduo um olhar detalhado e uma melhor compreensão da natureza e do meio que o cerca. Ressalta-se a importância das aulas desta componente curricular (MOREIRA, 2018), proporcionar aos alunos atividades que desenvolvam o pensamento crítico, observação prática do conteúdo teórico no cotidiano, além de possibilitar e facilitar o manuseio de equipamentos tecnológicos. Partindo do princípio que a física procura descrever os eventos físicos da natureza, torna-se necessário a criação de pensamentos mais sistematizados, de forma a detalhar e classificar os fenômenos. Neste sentido, o discente de física deve desenvolver estas habilidades para uma melhor compreensão dos assuntos estudados, deixando de ter o papel de ser um espectador, para tornar-se responsável pelo processo e construção do próprio conhecimento. Assim, o trabalho apresenta uma proposta de ensino para o tema do efeito Doppler, utilizado os aplicativos “Physical Phone Experments” e “Frequency Sound Generator”. São propostas atividades experimentais que possibilitem aos estudantes perceberem o efeito Doppler associado ao som. Além da realização e comprovação experimental do fenômeno com a utilização de APPs, disponíveis através das plataformas digitais e que podem servir de suporte para favorecer a construção da relação ensino-aprendizagem.