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

Claim 10:
11. 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 converter circuit to convert the signal from the band pass filter to a substantially DC signal;
a fixed gain amplifier to amplify the substantially DC signal;
a threshold circuit to establish a variable threshold level; and
a comparator circuit having a first input fed by the amplified substantially DC signal and a second input fed by the variable threshold level for producing a detection signal according to a value of the amplified substantially DC signal relative to a value of the variable threshold level.