| 摘要 |
PURPOSE:To generate a highly accurate synchronizing signal by a simple circuit by specifying an address of a read-only memory stored previously with waveform data on a ternary level synchronizing signal, and converting the read data into the ternary level synchronizing signal and outputting it. CONSTITUTION:A carry signal generated when a clock counter 11 is reset is counted by a line counter 15, which is reset in response to the leading or trailing edge of a frame pulse 13 to acquire synchronism with an image frame. The output 12 of the clock counter 11 is used as a low-order address signal and the output 16 of the line counter 15 is used as a high-order address signal; and they are supplied to the read-only memory 19 stored previously with the waveform data on the ternary level synchronizing signal to read the waveform data on the ternary level synchronizing signal out of the read-only memory 19. Consequently, the highly accurate synchronizing signal can be generated by the simple circuit. |
