The Goertzel Algorithm provides an efficient mechanism for tone detection\udin signal processing. However, on Wireless Sensor Network nodes, there is often not sufficient\udprocessing power to implement this using floating-point arithmetic, so fixed-point\udimplementations are used. In this paper we compare the quality of the results for a typical\udaudio application with different resolutions of fixed-point support using MATLAB.\udWe also provide performance figures based on implementing this on a representative sensor\udnode platform. Our results show that, for this application-space, 16-bit fixed-point\udarithmetic provides the best tradeoff of accuracy against performance. No previous work\udhas addressed this specific aspect of implementating the Goertzel algorithm.
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