| 摘要 |
There is disclosed a digital modulator whose modulation parameter can be controlled and in which modulation data or modulated signals are prevented from generating interference signals with adjoining circuits through control when power supply is turned on or system is changed. The digital modulator has means for detecting that the power supply is turned on, and the transmission data is modulated with fixed data in response to an output of the detecting means for a time required for completing a required system constitution setting. The digital modulator also has means for detecting the presence of the control for changing the system after the power supply is turned on. In response to an output of the detecting means, modulation is performed with the fixed data for a time from the start till the completion of the setting with a predetermined time added thereto. <IMAGE> |
