| 摘要 |
PURPOSE:To connect a keyboard to a control part via a capable with a few number of cores, by synthesizing two analog signals corresponding to one horizontal string and one vertical string including an operated key, outputting it to the control part, and converting it to a prescribed code defined at every key at the control part. CONSTITUTION:At every operation of either key in a key group in which plural keys are arranged in the horizontal string and the vertical string, respectively, two analog signals corresponding to one horizontal string and one vertical string including the operated key are synthesized, and outputted to the control part 2. And the control part 2 converts a supplied synthesized analog signal to a code defined in advance at every key in the key group. In such a way, it is possible to connect a key input part 1 to the control part 2 by using the cable 3 with a few number of cores. Also, since the analog signal from the transmitted, it is possible to extend a distance between the key input part 1 and the control part 2 larger.
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