Design of Low-Cost Active Noise Cancellation System for Automobile

The noise in the automobile affects the driving experience. The noise in the car is dominated by low-frequency noise which can be effectively reduced by active noise cancellation (ANC). The commercial ANC system employed in the car is often adopting digital signal processing (DSP) to achieve noise cancellation, in which the cost is relatively high, and it is pre-built in the automobile itself. In this work, a low-cost portable analog ANC system is designed to cancel the noise in the automobile. Extensive experimental tests are carried out to suppress the single-tone noise in the automobile, ranging from 100Hz to 500Hz in a frequency step of 100Hz. The proposed ANC system managed to reduce a maximum of 16.7dB of noise at 200Hz and a minimum of 1.7dB of noise at 400Hz. The results show that the analog ANC system designed can significantly reduce the low-frequency noise in the automobile.