| 摘要 |
PURPOSE:To easily input a data to a sending buffer memory circuit when a part where a data signal is overlapped is expanded over all of horizontal scanning periods by counting the synchronizing signal of an input signal, and outputting a control pulse signal at every arrival of a count value at a setting value. CONSTITUTION:The output signal of a synchronizing separator circuit 2 which samples a vertical and a horizontal synchronizing signals from a television video signal from an input terminal 1 is inputted to an overlap timing pulse generation circuit 3, and at every arrival of horizontal scanning period when a data is overlapped, the pulse signal is outputted, and the data stored at a sending buffer memory circuit 7 is outputted. The data is overlapped on a signal from the terminal 1 with a data overlapping apparatus 9 through a sending signal processor 8, and is outputted as a data signal overlapped television video signal. The synchronizing signal from the circuit 2 is counted with a counter 4, and a count pulse signal is outputted, and a control pulse generation circuit 5 outputs the control pulse signal to a data input circuit 6 at a data signal overlapping time.
|
