Determining location using time difference of arrival

A method comprising:

• receiving a calibration signal by a wireless communication device of a computing device;
• detecting a signal by a first sensor of the computing device at a first time, a second sensor of the computing device at a second time, and a third sensor of the computing device at a third time, the signal generated by a user contact of a physical keyboard at a particular location within a virtual keyboard associated with the computing device;
• generating, by the computing device, a set of time differences of arrival (TDOAs) associated with the first time, the second time, and the third time;
• triangulating, by the computing device, the particular location within the virtual keyboard of the user contact of the physical keyboard using the set of TDOAs and the calibration signal;
• determining a character on the virtual keyboard using a cluster map, the character being associated with the particular location of the virtual keyboard;
• and
• determining, by the computing device, an angle of orientation of the physical keyboard with respect to the computing device based on the particular location within the virtual keyboard of the determined character on the virtual keyboard.

A computing device comprising:

• a wireless communication device, wherein the wireless communication device is communicatively coupled to a processor, and the wireless communication device receives a calibration signal from a physical keyboard;
• a first sensor to receive a signal at a first time, the signal generated by a user contact of the physical keyboard at a particular location within a virtual keyboard, wherein the virtual keyboard is superimposed on a surface the physical keyboard;
• a second sensor to receive the signal at a second time;
• and
• the processor to:
• calculate a time difference of arrival (TDOA) associated with the first time and the second time;
• access additional information relating to the physical keyboard with respect to the computing device;
• determine the particular location within the virtual keyboard of the user contact of the physical keyboard using the TDOA, the additional information and the calibration signal;
• identify a character on the virtual keyboard using a cluster map, the character being associated with the particular location within the virtual keyboard;
• and
• determine an angle of orientation of the physical keyboard with respect to the computing device based on the particular location within the virtual keyboard of the identified character.