| 摘要 |
The present invention concerns a method for differential sampling with a fixed sampling frequency fo. When sampling a signal varying between +Vmax and -Vmax, the dynamics of the sampled signal is large close to the ends of the interval but it is small close to zero. The present invention, however, gives a solution to the problem of measuring the fine structure of a signal, with constant resolution over a large amplitude interval. This is done by measuring an analogous signal and on every sampling occasion directly sampling the signal V and forming the difference, Vdiff, between the signal on this sampling occasion and the preceding. The difference is then amplified in order to increase the dynamics in the following sampling and the present signal value is reconstructed from the direct value V of the signal at a starting point, the initial value, and the sum up to the present time of the following differential values Udiff, (6), divided by their amplifications. |
