| 摘要 |
PURPOSE:To realize a shared television receiving system of a standard system and a system having a horizontal scanning frequency corresponding to (n) times that for the standard system, by making the number of input signals to be a minimum, by switching the presence of absence of the auxiliary deflection, and by switching two kinds of pseudo interlace. CONSTITUTION:A signal of a standard is converted to a horizontal scanning frequency corresponding to two times the standard system by a signal conversion circuit 3. A PLL (phase locked loop) circuit 8 converts the scanning frequency of a horizontal synchronizing signal to a frequency of 2 times. And an auxiliary deflection signal Hp is produced. Only when the controlling signal Hp is supplied to an input terminal 41, a comparator circuit 44 outputs an output which is supplied to a switching circuit 46, and the output of it is supplied to a relay 47. When the controlling signal of the 1st auxiliary deflection means is supplied, the relay 47 is turned on to output the auxiliary deflection signal. When the controlling signal of the 2nd auxiliary deflection means is supplied, an auxiliary deflection signal having a two times signal amplitude is outputted. Therefore, by detecting the controlling signal of a waveform shaping circuit 9 by a detection circuit 20, the pseudo interlace state of the 1st and the 2nd auxiliary deflection means is realized. |
