| 摘要 |
<p>PURPOSE:To reduce noise by inputting the same analog signal to excess A/D converters, summing their digital outputs and dividing the result by the number of added signals when analog signals less than number of the A/D converters in a digital TV in which plural number of the A/D converters are employed. CONSTITUTION:An analog switch 7 is provided, which switches an SVHS C signal also to an input composite video signal of an A/D converter 4. Outputs of two A/D converters 3, 4 are added by an adder 8 and the result is divided by 2 at a multiplier 10. In order to halve the gain, the multiplier 10 is to be shifted by one bit. Thus, analog noise caused at the MSB change point is halved and the nose is divided into two and outputted with a timewise deviation. That is, the level of the analog noise generated at the MSB change point is decreased and scattered timewise.</p> |
