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ANR (2)
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of civil aviation medicine. 3rd ed. Montreal, 2012. (Doc. 8984 AN/895).
- Contexto
- In recent years Active Noise Reduction (ANR) has become widespread. The mechanism is, in short, that noise is removed by emission of a sound wave of the exact same frequency as that of the incoming sound wave but in the opposite phase, thus eliminating the noise. The technique is limited to lower frequencies (up to 1 200 Hz), it is therefore important to use additional passive noise protection.