Patent ID: 8766081

Claim:
A touch sensing device comprising: a first contact and second contact provided at each of a plurality of keys, the first contact and second contact being successively closable in accordance with a key press operation; a reception section that receives closed sense signals from the first contact and the second contact; a first counter that, based on the respective closed sense signals received from the first contact and the second contact, counts a first count value that indicates a duration from when the first contact is closed until the second contact is closed; a second counter that counts a second count value that indicates a duration after the counting of the first count value ends; a comparator that compares the second count value with a pre-specified attainment duration value and, when a result of the comparison satisfies a predetermined condition, outputs a control signal; and a controller that, when it receives the control signal from the comparator, sends sound emission information instructing an emission of sound by a sound emission controller, the sound emission information including touch information based on the first count value, wherein, when the attainment duration value and the second count value match, the comparator sends a match signal that serves as the control signal.