| 摘要 |
PURPOSE:To eliminate the need for a surface/back face switching-only key by holding a station No. received at present, comparing it with the station No. of the depressed key and using an address indicator such as a flip-flop so as to discriminate the result of comparison. CONSTITUTION:In depressing a key designating the channel 2 at a key matrix section 11, a key input circuit 12 decodes the key and a station number circuit 14 generates the data of the channel 2. Since the data of a reception station No. section 13 is the data of a 2nd channel, when the data is compared with the data of the station No. section 14 by a comparator 15, the same, e.g., data 0 is outputted. An address indicator 16 gives the instruction that it is the back face of the data 0. Then an address counter 17 outputs the address of the 5th channel being the back face of the 2nd channel by the data of the 2nd channel of the station No. circuit 14 and the discrimination signal representing the back face of the address indicator to a memory 18. Thus, the surface/back face switching-only key is not required.
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