Abstract
A multichannel active noise control system, based on a feed forward LMS algorithm, is simulated and implemented experimentally to reduce tonal noise components from internal cooling fans in laptops. Several 3-D simulations were carried out in order to determine the proper number and location of sensors and actuators, with three different criteria of reduction: sound pressure, sound intensity at discrete points, and global sound power. Results of simulations show reductions of up to 38 dB in the radiated sound power for a configuration consisting of three control actuators, three error sensors, and one reference sensor. Subsequently, experimental tests were undertaken of active noise control in a laptop, with the proposed configuration, in an anechoic chamber. Results show reductions of up to 15 dB in the sound pressure levels of individual error sensors. Hence, it is concluded, both theoretically and experimentally, that active noise control is a promising strategy to reduce tonal fan noise in personal computers.
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