Abstract: An exemplary data processing device includes a clock recovery system for locking a clock frequency to time stamps (PCR) of an incoming data stream, e.g. MPEG. The exemplary device uses a free running clock (20) that generates a reference frequency (FREF) from which a desired locked clock frequency is synthesized (25,35) under control of a processing unit (24,34) that compares (241,341) the locked clock frequency to the time stamps (PCR). MPEG audio and video processing clock frequencies are synthesized (25,35) from a free running reference frequency (FREF) and locked to the MPEG time base on basis of time stamps (PCR) provided in the MPEG data stream. Other sub-systems (23,23′) run on frequencies that are not locked to the time base, e.g. simple multiples (22,22′) of the free running reference frequency (FREF).