Method, apparatus, and computer-readable medium for key press determination

A system for determining a key press from a current keyboard state, comprising:

• signal storing means for storing signals indicative of a last key press, a last key press time, and a last keyboard state;
• signal receiving means for receiving signals indicative of a current keyboard state and a current time;
• first determining means for determining:
• (a) which keys on the keyboard have been released at the current time and (b) which keys on the keyboard have been pressed at the current time based on comparison with the last keyboard state;
• and
• second determining means for determining a key press at the current time if the first determining means determines a single key press at the current time and if either of:
• (a) there exists a match between the key press at the current time and the last key pressed and if the elapsed time between the key press at the current time and the last key press time is larger than a preset bounce time;
• and (b) there does not exist a match between the key press at the current time and the last key press.

A computer-readable medium comprising:

• at least one sequence of instructions, wherein execution of the instructions by a computer causes the computer to:
• (i) determine which keys on a keyboard have been released at a current time based on comparing a current keyboard state with a last keyboard state;
• (ii) determine which keys on a keyboard have been pressed at the current time based on comparing the current keyboard state with the last keyboard state;
• and
• (iii) determine a key press at the current time if step (ii) determines a single key press at the current time and if either of:
• (a) there exists a match between the key press at the current time and a last key press and if the elapsed time between the key press at the current time and a last key press time is larger than a preset bounce time;
• and (b) there does not exist a match between the key press at the current time and the last key press.

A key detect system for determining a key press on a keyboard connected thereto comprising:

• a processor for receiving signals indicative of a current keyboard state;
• and
• a memory coupled to the processor, the memory having stored therein a last key press, a last key press time, a last keyboard state, and sequences of instructions which, when executed by the processor, cause the processor to (i) determine which keys on the keyboard have been released and which keys on the keyboard have been pressed based on comparing the current keyboard state and the last keyboard state, and (ii) determine a key press if the (i) determination determines a single key press and either of:
• (a) a match exists between the key press and the last key pressed, and the elapsed time between the key press and the last key press time is larger than a preset bounce time;
• and (b) a match does not exist between the key press and the last key press.