| 摘要 |
A video device includes a video signal generation circuit, an encrypted signal detection circuit and a central processing unit (CPU). The encrypted signal detection circuit detects encrypted messages in video signals output from the video signal generation circuit and outputs stable trigger control signals to the CPU, which includes an amplifier circuit, a separation circuit, a reverse circuit, a delay circuit and a trigger circuit. The video signals are amplified via the amplifier circuit and negative phase pulse signals are extracted from the video signals via the separation circuit. The reverse circuit converts the negative phase pulse signals to positive phase pulse signals that are delayed via the delay circuit. The trigger circuit outputs the stable trigger control signals based on the delayed positive phase pulse circuit. |
