Touchless sensing and gesture recognition using continuous wave ultrasound signals

A computer system comprising:

• a processor;
• a memory coupled to the processor;
• an ultrasound emitter coupled to the processor;
• and
• one or more sound detectors coupled to the processor,
• wherein the processor is configured with processor-executable instructions to perform operations comprising:
• receiving, at a sound detector of the one or more sound detectors, ultrasound signals that are encoded with temporal information, wherein the ultrasound signals are frequency modulated with a pseudorandom noise signal;
• calculating a channel impulse response based on the ultrasound signals;
• processing the channel impulse response to extract at least one feature;
• comparing the extracted at least one feature to a database of channel impulse response features to identify a particular matched feature;
• and
• selecting a command to be executed by the processor based on the particular matched feature.

A computer system comprising:

• means for receiving, at a sound detector, ultrasound signals that are encoded with temporal information, wherein the ultrasound signals are frequency modulated with a pseudorandom noise signal;
• means for calculating a channel impulse response based on the ultrasound signals;
• means for processing the channel impulse response to extract at least one feature;
• means for comparing the extracted at least one feature to a database of channel impulse response features to identify a particular matched feature;
• and
• means for selecting a command to be executed by a processor based on the particular matched feature.

A non-transitory computer readable storage medium storing computer-executable instructions that, when executed by a computer, cause the computer to perform operations comprising:

• receiving, at a sound detector, ultrasound signals that are encoded with temporal information, wherein the ultrasound signals are frequency modulated with a pseudorandom noise signal;
• calculating a channel impulse response based on the ultrasound signals;
• processing the channel impulse response to extract at least one feature;
• comparing the extracted at least one feature to a database of channel impulse response features to identify a particular matched feature;
• and
• selecting a command to be executed by a processor based on the particular matched feature.