Method and apparatus for multiplexing complete MPEG transport streams from multiple sources using a PLL coupled to both the PCR and the transport encoder clock

DETAILED DESCRIPTION The present invention is a method and apparatus for splicing transport streams from multiple sources without violating the clock slew rates specified for a receiver.
The method locks both the transport output clock of the digital studio and the transmission symbol clock to a stable reference clock.
More specifically, the present invention employs a digital phase lock loop circuit (PLL) to lock the transport output clock of the digital studio and the transmission symbol clock to the reference clock, where the reference clock, e.
g.
, 27 MHz, is used to generate the PCR values.
The reference clock is manipulated in accordance with a specific relationship, using frequency divider factors, to effect the locking of the various studio clocks.