| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain highly accurate gain adjustment for an analog video signal without using a generator of a referenced analog signal. SOLUTION: An amplifier means 101 adjusts the gain of an analog video signal outputted from an output terminal I12 . A signal processing means 103 does not conduct signal processing in the adjustment mode designation by a signal processing designation means SW11 but supplies a digital video signal from an A/D converter means 102 to a delay means 104 directly. A changeover means SW12 selects a digital reference video signal from a reference signal generating means 106 in the case of designation of a 1st changeover mode by a changeover designation means SW13 and provides a digital video signal delayed by one horizontal synchronizing signal period from a delay means 104 or a digital reference video signal from the reference signal generating means 106 for each horizontal synchronizing signal period. An amplifier means 108 applies gain adjustment to the analog video signal from a D/A converter means 107 to provide an output from the output terminal I12 and an amplifier means 109 outputs an analog video signal from a D/A converter means 107 from the output terminal I11 .</p> |
