| 摘要 |
<p>PURPOSE: To automate the assembling process of a product relating to a video signal by adjusting a carrier frequency and a frequency shift matching the recording standard automatically. CONSTITUTION: A microcomputer 2 controls a switch SW1 so as to select a SYNC tip level signal Vs in a 1st adjustment mode and controls a switch SW 2 to be closed. Thus, the signal Vs is frequency-modulated by an oscillator 209 via a variable gain amplifier 16 and an adder 18, frequency-divided into a prescribed number by a frequency detection section 24 and the result is outputted to the microcomputer 2. The microcomputer 2 outputs 1st control data to a carrier frequency setting section 26 so as to make the frequency of the modulated output match the reference frequency. In a 2nd adjustment mode, the microcomputer controls the switch SW1 to select a signal Vw with a white peak level and controls the switch SW2 to be closed. In the normal mode, the microcomputer 2 controls the switch SW1 to select a clamp output of a video signal of a clamp circuit 10 and controls the SW2 to be open.</p> |
