Research Article
Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed Spaces
Table 1
The list of all the accessories used in the V1.5 and V2.0 device.
| | Accessory name | Numbers | | The V1.5 device | The V2.0 device |
| | Circular chassis | 1 | 1 | | Clamping groove plate | 4 | 3 | | Cylinder | 4 | 4 | | Moving coil loudspeaker | 4 | 4 | | Electret pickup | 4 | 4 | | Noise reduction circuit board | 2 | 1 | | Low voltage power supply | 1 | 1 | | Infrared remote control switch | 1 | 1 |
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