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In this work we have developed an apparatus for studying the sound emitted by vibrating strings using the Arduino platform. Steel and nylon strings were attached to a device that made it possible to apply a strain to the strings and investigate the relationship between this force and the frequency of the sound emitted using, together with the Arduino, respectively, a force sensor based on the HX711 and an audio sensor based on the MAX4466 circuit. The audio signal has obtained from the analog-digital (A/D) conversion of the electrical voltage at the output pin of the sound sensor. To obtain a more reliable signal, we implemented programming strategies that allowed us to increase the A/D conversion speed and reduce the impact of Arduino-PC communication latency. After spectral analysis of the audio signals, we found a good agreement between theoretical predictions and the results obtained experimentally showing, thus, that the adopted approach can be used both in the development of experimental classes as well as in the manufacture of instrumentation for research in the acoustics. [ABSTRACT FROM AUTHOR]

Study about the relation of the ethnomusicology with the audio technology covering the main technological and conceptual developments of these two areas since the late nineteenth century. It aims at covering the history of the former since the systematic musicology until the present centering on the technology that characterized the way, calling attention to less covered questions. The methodological procedures were: bibliographic and field research, document and behavior analysis in recording studio and acoustic analysis. It suggests the existence of some landmarks in the historical process and that any factor related with the phonographic production process may exert influence on the acoustic result of a recorded musical manifestation. It also calls attention to the need of more research on the influence of technical and conceptual elements of phonographic production on oral transmission manifestations. [ABSTRACT FROM AUTHOR]

At the present article we refer to the pedagogical use and the construction of an experimental device whose cost is minimum to measure periods, specifically of a simple pendulum. In this case the low-cost instruments are available to the teachers at schools. Its operation is similar to the Photogate, an electronics device that contains emission and reception of infrared light. The new suggested device changes light into sound during its operation so we denominated it, Soundgate. [ABSTRACT FROM AUTHOR]