Discrete-time signal processing
Discrete-time signal processing
Speech Coding Algorithms: Foundation and Evolution of Standardized Coders
Speech Coding Algorithms: Foundation and Evolution of Standardized Coders
Noise pattern recognition of airplanes taking off: task for a monitoring system
CIARP'07 Proceedings of the Congress on pattern recognition 12th Iberoamerican conference on Progress in pattern recognition, image analysis and applications
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This work presents a computational model that allows the monitoring of aircraft generated noise. It makes spectral analysis and calculation of statistical indicators, as well as the aircrafts identification based on generated noise. This model also helps to foresee potential effects to health caused by this kind of noise during the aircraft takeoff, which is when the greatest impact are generated due to the sonorous levels that are reached. This model is implemented by means of software in a laptop, a data acquisition card and a calibrated sensor of acoustic pressure. The method can be included in a permanent monitoring system. The data acquisition is made at 25 KHz at 24 bits. The identification of the aircraft noise is done through two parallel neural networks combined with a weighted addition. In order to generate the inputs to the neural networks, parameters that were obtained from the auto-regressive model and the 1/12 octave analysis are used. This system has 13 categories of aircrafts and it has an identification level of 80% in real environments.