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Detecting Test Audio Signal Automatically with Fourier Analysis and Pattern Recognition

We investigate using signal detection techniques for testing the audio capability of television sets in an industrial production line with the objective of identifying defectives devices. Two approaches were investigated in this study: the first was based in searching for specific frequencies of sufficiently high magnitude, and the second on detecting specific patterns of alternating frequencies. The results suggest that the first approach is highly susceptible to noise, while the second overcomes this problem, detecting all patterns in the audio segments.