Patent ID: 11921187
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A method comprising:
emitting, by a loudspeaker of a device and during a period of time, ultrasonic signals into an environment;
receiving reflected signals corresponding to the ultrasonic signals, the reflected signals originating at an object in motion;
generating, over a plurality of time frames, data including energy values corresponding to the reflected signals, wherein the reflected signals traveled respective distances to return to the device;
generating, using the data, a plot that represents the energy values at the respective different distances for the plurality of time frames;
determining, for each of the plurality of time frames, a cluster of the energy values;
identifying a group of the energy values that are above a threshold energy value, wherein each of the clusters includes at least one energy value in the group of the energy values; and
determining, using the group of the energy values, distance data that indicates distances between the object and the device during the period of time.