PROJECT TITLE :

A Low-Power Broad-Bandwidth Noise Cancellation VLSI Circuit Design for In-Ear Headphones - 2016

ABSTRACT:

Standard active noise cancelling (ANC) headphones often perform well in reducing the low-frequency noise and isolating the high-frequency noise by earmuffs passively. The existing ANC systems typically use high-speed digital signal processors to cancel out disturbing noise, which results in high power consumption for a industrial ANC headphone. The contribution of this paper can be classified into: 1) correct filter length choice; a pair of) low-power storage mechanism for convolution operation; and 3) high-throughput pipelining architecture. With these novel techniques, we develop an area-/power-economical ANC circuit by using the TSMC 90-nm CMOS technology for in-ear headphone applications. The proposed feedforward filtered-x least mean square ANC circuit style provides the features of using lower operating frequency and consuming abundant less power that facilitate better performance than the standard ANC headphones. To verify the effectiveness of the proposed design, a series of physical measurements is executed in an anechoic chamber. Measurement results show that the proposed high-performance/low-power circuit style can scale back disturbing noise of various frequency bands very well, and outperforms the prevailing works. The proposed design can attenuate fifteen dB for broadband pink noise between 50 and 150zero Hz when operated at 20-MHz clock frequency at the costs of 84.2 k gates and power consumption of vi.59 mW only. Compared with the prevailing styles, the proposed work achieves higher noise cancellation performance in terms of 3 dB further and saves ninety seven% power consumption.