Signal pick-up circuit

Details Signal pick-up circuit Signal pick-up circuit

H - Electricity

04

N

350/48

H04N 5/21 (2006.01) H04N 5/217 (2006.01)

Patent

CA 1165434

ABSTRACT OF THE DISCLOSURE A signal pick-up circuit is disclosed which has the base on the fact that the noise level in an output from an image picking-up device is constant during one bit interval and no signal component exists during pre-charge period or interval thereof and eliminates the noise upon the pre-charge operation by using the difference between the level of the output during the pre-charge and signal levels intervals. The signal pick-up circuit includes an image picking-up device having a charge transfer element and producing an output charge corresponding to an object to be picked up, a circuit for receiving the output charge from the image pick-up device and producing a charge detecting signal including a reference level portion and a signal portion provided by charge or discharge in response to the output charge, the reference level portion and the signal portion being repeated at every one bit of the output charge, and a circuit for providing difference output between the reference level portion and the signal portion.

427684

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