| 摘要 |
PURPOSE:To eliminate the filters for waveform shaping and deletion of undesired higher harmonic waves, by previously memorizing the waveform passed through a filter and to be transmitted into a memory and then reading the waveforme by the data and the speed of the data to turn it into a transmission signal. CONSTITUTION:The transmission data signal supplied to an input terminal 30 advances an address counter 35 in a speed of 32 times as high as the speed of tramission bit. Then a waveform sin<2> that is stored in the form of a digital signal (5 bits) is read successively out of a waveform memory 32 by the read-out address. On the other hand, the transmission data signal supplied to the terminal 30 is converted into a signal E with which the input pulse is delivered with every second units to be used for a control signal of a positive/negative reversing circuit 37 that reverses the output digital signal of a waveform memory 36 to a positive or negative state in a digital way. The output of the circuit 37 is supplied to a D/A converter 39, and a bipolar signal free from the waveform shaping and undesired higher hamonic waves emerges at the output of the converter 39. |
