| 摘要 |
PURPOSE:To reduce an error in sampling by providing a filter circuit, which estimates a real sampled value from the output sampled value of a sample holding circuit and then inputs it to a quantizing circuit, between the sample holding circuit and quantizing circuit. CONSTITUTION:An analog signal inputted from an input terminal 1 is passed through a low-pass filter 2 to eliminate an unnecessary high frequency component, and the output of the low-pass filter 2 is sampled by a sample holding circuit 3 and then inputted to a filter circuit 7. The filter circuit 7 estimates a real sampled value from the output sampled value of the sample holding circuit 7 and then inputs it to a quantizing circuit 4. The quantizing circuit 4 converts the analog signal into a digital signal, which is processed variously by a digital signal processing circuit 5 to output the result from an output terminal 6. |
