Electronic musical instrument
AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorTaichi Kosugi
Life of this patent
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Abstract
In an electronic musical instrument which generates musical tone signals based on playing information input from a key switch circuit 10, a key scan circuit 11 includes a decode circuit 22 to which the current status information and the previous status information read out from a scan data memory 21 are input, and if status information which cannot be processed is input, the decode circuit 22 converts it to status information which can be processed, and if there is no empty space in an output data buffer 24, the decode circuit 22 detects no status change. Such construction allows malfunction to be prevented with a simple construction.
Claims5
An electronic musical instrument which generates musical tone signals based on playing information input from a keyboard having a plurality of keys, each key being provided with a first and second switches, the first switch operating first at the time of key-on, the second switch operating first at the time of key-off, the electronic musical instrument comprising:
- a scan means for sequentially generating current status information on the first and second switches,
- a memory means for storing the status information on the first and second switches,
- a decode means for being supplied, for each key, with a current status information generated by the scan means and the previous status information read out from the memory means, and if the current status information being physically irrational is supplied, converting it to a physically logical status and outputting as a corrected status information avoiding outputting malfunctions due to noise,
- wherein the memory means stores the output status information from the decode means for each key as the previous status information, and
- a playing information generation means for outputting playing information based on the output information from the decode means.
Dependencies are inferred from the claim text.