65.19.76.104
In Reply to: RE: ASRC not necessarily bad. posted by Todd Krieger on November 02, 2009 at 18:04:19
"What happens is if the input signal is time-shifted from jitter, which the intermediate interpolated signal is correlated to, what's sent to the output will not be of correct amplitude, and these amplitude errors, which is a function of the input jitter, introduce noise."
This noise comes from three sources, all of which can be addressed.
1. Error in estimating the time at which the input signal should have arrived if it were jitter free. (Reduce this error by using a better digital PLL, one that averages over a longer time period and which using more bits of virtual time resolution.)
2. Error in performing the interpolation between output clock points due to inaccurate algorithm. (Reduce this error by using a higher order interpolator or a higher output sample rate or a combination of the two.)
3. Error in calculating the interpolated values. (Use a longer word length in the interpolation calculations.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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