SIGNAL PROCESSING CIRCUIT FOR SOLID-STATE IMAGE PICKUP DEVICE

PURPOSE:To remove a noise included in an output signal by holding an image pickup signal level in an idle period existing in every one line period of the output image pickup signal of an image pickup part as a zero level after sampling it, and subtracting it from an original image pickup signal by subtractor. CONSTITUTION:The image pickup signal is integrated by an integrator 28 during the idle period ta at each line, and the variation of the zero level having a period shorter than one line period is extracted while the noise is suppressed, and sampled and held by a sample-hold circuit 22. Therefore, integration and sampling-hole can be executed while spending sufficiently long period compared with the zero level period at each picture element. The signal level of the idle period ta at every one line extracted from the sample-hold circuit 22 in such a manner is supplied to the subtractor 23. It is subtracted from the original image pickup signal, and a processed image pickup signal whose zero level variation is canceled, i.e., whose noise is nearly removed is generated.