JSmith
Master Contributor
DPLL is used to eliminate clock jitter. The DPLL value defines the bandwidth of the clock lock. The wider the bandwidth, the easier the locking. The narrower the bandwidth, the more effective the jitter removal.
Some sources (like some TVs for example) have a too high clock jitter, which can cause an inability of the PLL chip to perform its locking, resulting in a jerky sound. Increasing the DPLL can then correct this problem.
JSmith