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In certain circumstances, acoustic measurements are remarkably challenging because there isn’t a practical way for a measurement system to perform reproduction and acquisition simultaneously (for example, when measuring the transmission loss between two rooms).
A solution to this problem is the use of distributed acoustic acquisition, in which sev...
Citations
... The prototype consists of two wirelessly synchronized nodes with Raspberry Pi computers as processing units. This paper builds upon the work done with the Acoustics Research Center at NTNU for a specialization project and master's thesis titled "Distributed acoustic acquisition with low-cost embedded systems" [1,2]. ...
... To provide a reference point for the analysis, these tests were also executed (when applicable) on a low-cost measurement system composed of a laptop computer, an Edirol UA-25 consumer-grade sound card, and the EASERA acoustics software. For a more detailed account of the measurements and obtained results refer to [1,2]. ...
Under some circumstances having an acoustic measurement system handling both reproduction and acquisition becomes very challenging or technically impossible (e.g. long-range outdoor sound propagation experiments or when measuring transmission loss between two rooms). A solution to this problem is distributed acquisition in which the measurement system is not composed of a single measuring device but of separate nodes that communicate wirelessly, and which are assigned specific tasks. This paper describes a prototype of such a measurement system for which the main design constraints were cost and portability. The use of the prototype was limited to the measurement of impulse responses with the swept-sine technique since it allows high signal-to-noise ratio while not requiring a tight synchronization between the clocks of the nodes in the system. The quality of the measurements obtained was checked by a reference to a commercial measurement system in a real-world situation. The obtained results suggest that at a lower cost and reduced size, the prototype offers audio quality comparable to that of commercial systems while adding the flexibility associated with distributed acquisition. Nonetheless, node synchronization proved to be a limiting factor in the usability of the system as it was not possible to achieve accurate timing of the beginning of the acquisition below five milliseconds.
