| 摘要 |
<p>PURPOSE:To prevent the generation of quantization variation by deciding whether the time variation width of a quantizing input due to analog/digital conversion is included within a prescribed range or not, and when the value exceeds the prescribed range, outputting the quantizing input as a new quantizing input. CONSTITUTION:New A/D converted quantizing input data are inputted and stored to/in an input buffer 61. The absolute value of a difference between quantizing input data outputted from an output buffer 63 to a digital processor 3 to be the succeeding step and the new quantizing input data is calculated and compared by a comparing part 66. When it is decided that the variation width of the quantizing input is included within the prescribed range, the initial quantizing input is continuously outputted to the succeeding step by the output buffer 63, and at the time of deciding that the value exceeds the prescribed range, the quantizing input is outputted to the succeeding step as a new quantizing input. Consequently, the generation of quantization variation due to noise, power supply variation, the reference voltage variation of an A/D converter, etc., can be prevented.</p> |
