Patent ID: 8169512

Claim:
A video signal processing circuit comprising: an amplifier that amplifies an analog video signal, the analog video signal being sequentially outputted in pixel unit from an imaging element depending on a driving period, a level of the analog video signal changing depending on the quantity of electric charge accumulating in a pixel; a timing generator that outputs a first-pulse signal and a second-pulse signal at different timings; a first-sample hold circuit that samples an analog video signal outputted from the amplifier at a timing when the first-pulse signal is provided and holds a level of the analog video signal; a second-sample hold circuit that samples an analog video signal outputted from the amplifier at a timing when the second-pulse signal is provided and holds a level of the analog video signal; an acquirer that acquires a difference between the level of the analog video signal held at the first-sample hold circuit and the level of the analog video signal held at the second-sample hold circuit; an analog/digital converter that obtains a digital video signal corresponding to the analog video signal on the basis of the difference generated by the acquirer; and a changer that changes the timing when the first-pulse signal is provided to the first-sample hold circuit, the timing when the second-pulse signal is provided to the second-sample hold circuit and a bias current depending on the driving period.