This article presents a method for digital acquisition of low-frequency signals immersed in high-frequency noise when noise frequency is higher than the sampling one. This method uses no antialiasing filters, but random sampling and filtering instead. Its formulation is developed for JRS (jitter random sampling) and finite impulse response (FIR) filters. The proposed method is experimentally tested on three FIR filters: moving average, windowed linear phase, and constrained least square.

TCONICET Abstract -This paper presents a digital acquisition method for low simulations were made and typical examples are presented with frequency signals immersed in high frequency noise. The method the logistic map (with a non uniform IPDF) and three piecewise reduces the aliasing with no use of hardware aliasing filters. Several linear maps (with uniform IPDF): the Three Way Bernoulli Shift

This paper introduces the use of random sampling for the recovery of dc signals immersed in noise. This technique avoids the use of antialiasing filters even if the disturbance frequencies are higher than the maximum sampling frequency available. The use of random sampling and a moving average (MA) filter for the measurement of dc signals is mathematically and experimentally demonstrated.

A method for controlling line-commutated converters in discontinuous conduction mode is presented. The proposed strategy is based on the modification of the firing angle α in order to produce the same effects on the average output current regardless the conduction mode. The compensation is based in an on-line estimation of the rectifier average output current in order to achieve the compensation angle. Simulations on a high-precision current control system are presented.

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