Patent ID: 11930334
Assignee: QUALCOMM TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 13:
14. An adaptive detection circuit to detect when an input stimulus to a sensor satisfies an adaptive threshold, the detection circuit comprising:
a band pass filter configured to receive an output from the sensor; and
a circuit fed from the band pass filter and configured to detect when the output from the sensor satisfies the adaptive threshold, and further configured to produce a signal upon detection to cause adjustment to operation of a device, with the adaptive threshold varying over time in accordance with detected changes in stimuli over a specified amount of time in an environment in which the device is located, wherein the adaptive detection circuit further comprises:
a variable gain amplifier having an input that receives the input stimulus, a control port and an output to provide an amplified output signal;
a comparator circuit having a first input coupled to the output of the variable gain amplifier and a second input fed by a fixed threshold level signal for producing a detection signal according to a value of the amplified output signal relative to a value of the fixed threshold level signal; and
a feedback circuit configured to produce a control signal that controls gain of the variable gain amplifier.