| 摘要 |
PURPOSE:To eliminate a fixed pattern noise without using a reset pulse, by clipping an input signal at the reference level, adding an inverted input signal with the input signal and then adding a delayed input signal with the clipped input signal. CONSTITUTION:An input signal 1 containing a fixed pattern noise signal is applied to a buffer amplifier 8, and a output signal is fed to clipping circuits 9. The circuits 9 clips a positive signal and a negative signal of the signal 1 respectively. A part of the output of the circuit 9 is inverted 10 and added 11 with the input of the circuit 9, and the signal is delivered from the circuit 11 and delayed 12 for its phase. Then the output of the circuit 12 is added by an adder 13 with the output of the circuit 9. As a result, the fixed pattern noise is eliminated. Thus an output signal containing no noise is transmitted without using a reset pulse generator. |
