| Paper ID | E-1-1.1 |
| Paper Title |
STUDY ON FEEDFORWARD ACTIVE NOISE CONTROL SYSTEM WITH OPTICAL LASER MICROPHONE TO DETECT REFERENCE SIGNAL WITH SHORT DELAY |
| Authors |
Kenta Iwai, Takanobu Nishiura, Ritsumeikan University, Japan |
| Session |
E-1-1: Active Noise Control |
| Time | Tuesday, 08 December, 12:30 - 14:00 |
| Presentation Time: | Tuesday, 08 December, 12:30 - 12:45 Check your Time Zone |
|
All times are in New Zealand Time (UTC +13) |
| Topic |
Speech, Language, and Audio (SLA): |
| Abstract |
The main problem of the feedforward ANC system is the degradation of its noise reduction performance owing to the causality constraint, that is, there is a need for the ANC system to update the noise control filter and emit the anti-noise until the unwanted noise reaches the error microphone. The proposed feedforward ANC system with the optical laser microphone is proposed to solve this problem. The proposed ANC system utilizes the optical laser microphone as the reference microphone that detects the vibration of the noise source. Since the optical laser microphone uses an optical laser, the unwanted noise is picked up more quickly than by an ordinary microphone. However, the coherence of the signals obtained by the reference and error microphones decreases and noise reduction performance may degrade since the proposed ANC system uses the ordinary microphone as the error microphone. To solve this problem, the proposed ANC system utilizes a differentiator for the reference signal to obtain the sound pressure by the differentiation of the velocity. Simulation results show that the proposed ANC system with the differentiator can reduce unwanted noise by almost the same amount as the conventional feedforward ANC system. |