engleski

A Programmable 3-Channel Acoustic Wake-up Interface Enabling Always-on Detection of Underwater Events within 20 μA

We present an always-on acoustic wake-up sensor interface, designed for prolonging the autonomy of energy-hungry hardware for underwater acoustic surveillance. Proposed design enables the detection of a passing ship by simultaneous listening up to three arbitrarily defined frequency-bands within the 2.5 kHz range, and generates a wake-up signal upon finding a match with a digitally preset template describing signal’s discriminatory time-frequency features. In this paper, we propose the architecture of such fully programmable, multichannel, mixed-signal wakeup circuit. We show the implementation of a PCB prototype, characterize its sensitivity, analyze its current consumption, and verify its response on real-world hydrophone recordings. It is demonstrated that the design consumes only 6.4 μA per channel (in total <20 μA) with ultra-lowpower COTS components, while listening.

acoustic event detection ; underwater surveillance ; always-on sensor interface ; DSP wake-up ; low-power design

nije evidentirano