Patent ID: 11937766
Assignee: SHARKNINJA OPERATING LLC
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 12:
13. A robotic cleaner comprising:
one or more surface type sensors configured to receive robotic motor sound reflected from a surface to be cleaned, the robotic motor sound being generated by one or more motors of the robotic cleaner; and
a controller electrically coupled to the one or more surface type sensors and configured to carry out a method of surface type detection comprising:
converting a signal received from the one or more surface type sensors to a frequency domain;
integrating the converted signal over a first and a second frequency range;
calculating a ratio corresponding to the integrated signal for the first frequency range and the integrated signal for the second frequency range;
comparing the ratio to a threshold; and
based, at least in part, on the comparison determining a surface type.