A PLL includes a fractional divider to generate a periodic PLL output signal in response to REFHF. Said method, based on the hierarchical subband encoding process called set partitioning in hierarchical trees, leads from the original set of picture elements of the video sequence to wavelet transform coefficients encoded with a binary format. The memory includes an audio buffer capable of continuously accumulating the audio signal until the buffer becomes full, and thereafter storing a predetermined time amount of the most recent audio signal.