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.
Claims17
A device comprising:
- 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.
A method, comprising:
- converting, by a device comprising an electronic circuit, a time-varying voltage signal to a discrete-time signal;
- determining, by the device, a quantizer statistic value based on the discrete-time signal;
- and
- determining, by the device, a signal statistic value for the time-varying voltage signal as a function of the quantizer statistic value and a gain control value as a function of the quantizer statistic value.
Dependencies are inferred from the claim text.