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- W2103530209 abstract "Cockpit noise measurements were carried out in a two-seat jet trainer. For the continuous time and frequency analyses a two-channel tape-recording system was constructed of two miniature microphones connected through an amplifier to a digital tape-recorder. The analysed and averaged noise exposure including radio communication was 80-81 dB when the ANC system was on and 84-89 dB when the ANC system was off. For the conventional flight helmet the same noise exposure was 86 dB, and the noise exposure in the cockpit was 104-106 dB. The effect of the ANC system on the averaged noise exposure (L(Aeq8min)) was an improvement of 4-8 dB over the noise attenuation of the same helmets when the ANC system was off. Both ANC systems worked properly during the test flights. No severe ringing or voice circulation was found except during extreme vibration." @default.
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- W2103530209 date "2001-01-01" @default.
- W2103530209 modified "2023-10-17" @default.
- W2103530209 title "Active noise reduction in aviation helmets during a military jet trainer test flight" @default.
- W2103530209 cites W1985210834 @default.
- W2103530209 doi "https://doi.org/10.1080/010503901300007452" @default.
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