| 摘要 |
A high speed image density converting apparatus includes an amplifier for amplifying an analog video signal, an A/D converter for converting an output of the amplifier into a digital video signal, and capable of setting a reference voltage, a memory for storing an output image of the A/D converter, an arithmetic device for calculating a reference signal value on the basis of the data stored in the memory, and a D/A converter for converting the reference signal issued from the arithmetic device into an analog signal to be supplied as reference voltage to the A/D converter.
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