A KIS solution for high fidelity interpolation and resampling of signals

A keep-it-simple (KIS) solution is introduced that interpolates a signal up to an arbitrary accuracy. It consists of interpolating the complex envelopes at the output of a perfect-reconstruction filter-bank: if K subbands are used, the proposed interpolation scheme is shown to have a similar figure of merit as if the signal was initially oversampled by factor K at the acquisition stage, yet without the storage burden implied by the latter method.

► High-fidelity interpolation of vibration and acoustic signals. ► Is crucial in many condition monitoring applications. ► An original and very simple solution is proposed. ► It consists of interpolating K subbands at the output of a PR filter-bank. ► Dramatically reduces interpolation error.