Abstract :
Broadband (turbulent) and narrowband noises are defined, and examples are given. The limitations of passive noise control techniques (good design, absorption) are noted, and active noise cancellation, using anti-noise (a copy of the noise used to cancel the original), is discussed. An active muffler system applied to an engine´s exhaust is presented as an example.<>
Keywords :
acoustic noise; noise abatement; active muffler system; active noise cancellation; anti-noise; antinoise; broadband noises; engine exhaust; narrowband noises; passive noise control techniques; turbulent noise; Acoustic noise; Active noise reduction; Costs; Digital signal processing; Frequency; Low-frequency noise; Narrowband; Noise cancellation; Noise level; Working environment noise;
