| 摘要 |
PURPOSE:To shorten the response time by making it possble to judge whether every one bit of a detection signal is correct or not in the receiving circuit side. CONSTITUTION:Signals K1-K8 inputted from a key switch matrix 5 are detected by a key input detecting circuit 14 and are supplied to an encoded signal generating circuit 15 to generate an encoded signal, and this signal is inverted for every bit signal, and inverted signals and individual bit signals before inversion are supplied to an output synthesizing circuit 17. These inverted signals are added to bit signals in the output synthesizing circuit 17 so that each bit signal and the following signal are certainly different in level from each other. Thus, it is possible to judge whether every one bit of the detection signal is correct or not in the receiving circuit side. |
