| 摘要 |
<p>A matrix switching apparatus for preventing a pseudo input condition caused by a detour of a signal as well as output of an erroneous signal caused by a noise intruding into an apparatus and the like, in which a plurality (10) of lines (11, 12) of keys (13) having a plurality of switches are arranged in the first and second directions respectively. The apparatus includes a detector (14, 15, 16, 17) for detecting an ON condition of the plurality of the switches by a time-sharing detection, a counter (21) for counting up a number of the switches which are in the ON condition simultaneously, both totally and respectively with the key lines, a storage means (20) for storing a first, second, third and fourth statuses which represent the condition of the switches respectively, and a controller (16) for inverting the second status into the first status. </p> |
