TRANSMISSION BURST WAVEFORM CONTROL SYSTEM

摘要

PURPOSE:To easily revise the setting of leading/trailing characteristic of a transmission burst waveform by controlling a reference voltage of a D/A converter converting a ROM output generating the transmission waveform into an analog value. CONSTITUTION:Transmission data 1 synchronized with a burst signal 8 being a transmission start/stop signal are decoded to an address of a transmission waveform generating ROM 4 by an address decoder circuit 2, a transmission waveform passing through a desired filter characteristic from the ROM 4 is outputted as digital data 5. The data 5 are converted into an analog value at a converter 6 and become a transmission burst signal 7. On the other hand, the signal 8 is formed into a waveform with a desired leading/trailing by a specific constant circuit 9 and the result is fed to a reference voltage of the converter 6. Thus, the leading/trailing characteristic of the transmission burst waveform 7 is formed into a desired characteristic.