Low power always-on microphone using power reduction techniques
AssigneeInvenSense, Inc.
InventorMichael Perrott
Life of this patent
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Abstract
An audio activity detector device is disclosed. The audio activity detector device comprises a closed loop feedback regulating circuit that supplies an input signal representative of a time-varying voltage signal to a quantizer circuit, wherein the quantizer circuit, as a function of the input signal, converts the input signal to a quantizer discrete-time signal; a first circuit that, as a function of the discrete-time signal, determines a key quantizer statistic value for the quantizer discrete-time signal; and a second circuit that, as a function of the key quantizer statistic value, determines a signal statistic value for the input signal and a gain control value.
Claims18
A device comprising:
- an electronic circuit that facilitates performance of operations, comprising:
- receiving, via a sensor device, an input signal representing an audio event;
- determining, as a function of an adaptable audio signal statistic representative of a root mean square signal energy value, that the audio event represents non-ambient audio activity;
- and
- minimizing a supply voltage to the sensor device and transitioning the sensor device from a first state to a second state as a function of the non-ambient audio activity.
An apparatus, comprising:
- an electronic circuit that facilitates performance of operations, comprising:
- receiving, via a microphone sensor device, an input audio signal;
- based on the input audio signal, determining a root mean square signal energy value associated with the input audio signal;
- determining, as a function of the root mean square signal energy value, that the input audio signal represents non-ambient audio activity;
- and
- in response to determining the non-ambient audio activity, minimizing a bias current supplied to the microphone device and transitioning the microphone sensor device from a first state to a second state.
Dependencies are inferred from the claim text.