Piezoelectric MEMS device with adaptive threshold for acoustic stimulus detection

Abstract

A device comprising an adaptive acoustic detection circuit and an acoustic sensor device, such as a microphone, is described. In addition to the sensor, the apparatus includes circuitry configured to detect when an input stimulus of the sensor satisfies an adaptive threshold, and to generate, upon detection, a signal that causes a performance adjustment of the apparatus, wherein the adaptive threshold is a threshold that varies over time as a function of a detected change in the sound of the environment in which the device is located.

Description

[0001] claim priority [0002] This application claims priority under US 35 U.S.C. § 119(e) to US Provisional Application 62 / 818,140, ​​filed March 14, 2019, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to acoustic sensing, and in particular to the use of sensors, such as microphones, as used in voice-activated devices, such as smart speakers, and other types of sound-activated devices. Background technique [0004] With the growth of the Internet of Things and the increased use of acoustically activated devices, one of the challenges for acoustically activated devices is reducing power consumption. In general, an acoustic sensing device senses acoustic signals (sound, vibration, etc.) that may occur at infrequent time intervals. To address the power consumption of acoustically activated devices, one approach is acoustic wakeup detection. In the case of acoustic wake detection, typically an acous...

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Problems solved by technology

[0004] One of the challenges for acoustically activated devices is reducing power consumption as the Internet of Things grows and more usage of acoustically activated devices

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