A Simple Denoising Technique
  The measurements of very low level signals at low frequency is a very difficult problem, because environmental noise increases in this frequency domain and it is very difficult to filter it efficiently. In order to counteract these major problems, we propose a simple and generic denoising technique, which mixes several features of traditional feedback techniques and those of noise estimators. As an example of application, large band measurements of the thermal fluctuations of a mechanical oscillator are presented. These measurements show that the proposed denoising technique is easy to implement and gives good results. 
F. Douarche, L. Buisson, S. Ciliberto, A. Petrosyan