| 摘要 |
PURPOSE:To transmit many kinds of data by using plural kinds of reference frequencies in sending a data through the combination of two kinds of signals being the frequency division of a reference frequency and adding the kinds of the combinations. CONSTITUTION:The transmission side has oscillators 11, 12... of different reference frequencies F1, F2..., a frequency division integrated circuit 2 and a push button 3. The reception side has oscillators 41, 42... of different reference frequency and a decoding integrated circuit 5. Switches 6, 7 are controlled to use the combination of the oscillators 11, 41 of the same frequency. The combination kind N1 as to the reference frequency F1 using the oscillator 11 and the N2 kind... as to other frequency F2 using the oscillator 12 represent different data at the transmission side. Thus, even if a frequency division integrated circuit 2 is used in common, many kinds of data are transmitted. The reference frequency of the reception side same as that of the transmission side is switched so as to be connected to the integrated circuit 5. |
