Image signal processing apparatus with analog to digital image conversion

An image signal processing apparatus for processing an image signal comprising:

• (a) clamping means for clamping an inputted analog image signal to a desired clamp level;
• (b) analog/digital converting means for converting said analog image signal clamped by said clamping means into a digital image signal;
• and
• (c) digital signal processing means for offsetting said digital image signal outputted from said analog/digital converting means to a first level during a blanking period, adjusting said clamp level of said clamping means by using said digital image signal offset to said first level during said blanking period, to adjust the black level of the blanking period of said digital image signal corresponding to said analog signal whose black level has been adjusted, to a second level, and outputting said digital image signal having said second level;
• and
• (d) second digital signal processing means for digitally processing said digital image signal outputted from said digital signal processing means in a different manner from said digital signal processing means, and outputting said processed digital image signal.

An image signal processing apparatus for processing an image signal, comprising:

• (a) clamping means for clamping an input analog color image signal to a desired clamp level;
• (b) analog/digital converting means for converting said analog image signal clamped by said clamping means into a digital image signal;
• and
• (c) digital signal processing means including offset means for offsetting a level of a blanking period of said digital color image signal output from said analog/digital converting means to a first level, for adjusting a black level of said analog color image signal by adjusting the clamp level of said clamping means using the digital color image signal output from said offset means and converting said first level of the blanking period of said digital color image signal converted by said analog/digital converting means from the analog color image signal clamped by said clamping means whose level has been adjusted by the black adjustment, to a second level.