Research Article
Active Noise Cancellation for Ventilation Ducts Using a Pair of Loudspeakers by Sampled-Data Optimization
Table 1
Experimental instruments.
| | Ventilation fan | Kaneka corp. SV-200U (,
energy-recovery ventilation) |
| | Loudspeaker (SPK1) | FOSTEX FW208N woofer speaker with wooden box
enclosure | | Loudspeaker (SPK2 & SPK3) | FOSTEX FW108N woofer speaker with PVC pipe
enclosure | | Microphones | Electlet condenser type | | Sound-level meter | RION NL-20 | | Power amplifier | TOSHIBA TA8213K | | High-pass filter | NF ELECTRONIC INSTRUMENTS FV-664 (2 ch, 80 Hz,
24 dB/oct) | | Low-pass filter | 500 Hz 4th-order Butterworth | | PC | Dell Dimension 2200 (RT-Linux 3.2, kernel
2.4.22) | | A/D, D/A | CONTEC AD12-16(PCI), DA12-4(PCI) (12 bit, V, ) |
|
|
