| 摘要 |
PURPOSE: To eliminate interference between simultaneously transmitted signals to obtain a high-definition picture by changing the transmission power of a second signal in accordance with the state of a first signal. CONSTITUTION: A TV signal is radiated through a TV modulator 100 and a horizontal deflecting antenna 108. A data signal is temporarily stored in a buffer 101 simultaneously with transmission of the TV signal and is next read out in order and is transmitted through a data modulator 105 and a vertical deflecting antenna 109. At this time, a busy detection circuit 106 monitors the TV signal and increases the output power of a data converter in the period of its busy part and reduces the transmission power of the data signal in the period of its idle part. Consequently, the larger transmission power of the data signal doesn't break the TV signal practically because the TV signal allows a large extent of interference in its busy part. |
