| 摘要 |
Disclosed is a method for overcoming one of the limiting factors in applying digital techniques to measuring analog signals over a wide dynamic range, namely, the uncertainty introduced into the measurement by noise and A/D conversion, particularly at low signal levels. A central feature of the technique is the filtering of the signal with a variable time constant digital filter, the time constant being a function of the measured signal in such way as to increase the effective resolution of small signals at the expense of an increased transient delay. For large signals, the time constant is reduced so that adequate transient response is provided when it is most needed and when there is already adequate resolution.
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