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ANC Around a human's head

ANC Around a human's head

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Active Sound and Vibration Control: theory and applications — Recommend this title to your library

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This chapter introduces a new active noise control system for optimal control of the sound field around a human's head. Geometrical arrangements of error microphones are proposed around the head in a diffused noise field. In order to evaluate the controlled sound field, a rigid sphere theoretical model is used as a human's head in the computer simulations. In previous studies it was shown that the theoretical sphere model maintains a good approximation of a head-related transfer function (HRTF) below about 5 kHz. In this chapter the relationship between the noise reduction and the corresponding configuration of the error microphone and secondary source arrangement is evaluated. As a result, we found that the closely located secondary sources to the sphere head give significant noise reduction in a large control area. A possible arrangement of the error microphones is found to provide an optimal result according to a given control strategy, such as flatness of reduced sound pressure of the quiet zone.

Inspec keywords: active noise control; optimal control

Other keywords: sphere model; controlled sound field; optimal control; rigid sphere theoretical model; head-related transfer function; diffused noise field; computer simulation; sphere head; secondary source arrangement; active noise control system; human head; error microphones; noise reduction; adaptive prediction method

Subjects: Other nonelectric variables control

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