1. A method of detecting and isolating at least one rhythmic signal component from a discrete-time input signal, comprising: subjecting the input signal to discrete wavelet packet transform multi-resolution analysis; applying wavelet packet basis selection criteria to the result of the analysis, at each stage of the analysis, to evaluate the wavelet packet transform decomposed signal components of the input signal; detecting at least one rhythmic signal feature from the input signal based on the evaluation; and isolating the detected at least one rhythmic signal feature from the input signal.