| 摘要 |
PURPOSE:To enable to adapt the unit to any code system requested by the modulation circuit easily, by constituting the differential encoder using read only memory. CONSTITUTION:The read only memory ROM 4 having the first and second address input terminals A0, A1 and the readout data output terminal D0, and the delay circuit by D type FF6 delaying the output data read out from ROM 4, are provided, and the delayed data is fed to the input terminal A0. Further, the output of FF7 controlled with the data and clock is fed to the input terminal A1. The output read out from ROM 4 is fed to the multiplier 9 via the level converter 8 and it is modulated with the output of the oscillator 10, the logic signal inputted is outputted at the output of the multiplier 9 with the signal modulated at the modulation input level of the oscillator 10. Further, it can be adapted to any code system requested by the modulation circuit. |
