how to determine the low end and high end for phase noise calculation

felixlee

Member
2014-12-22 1:25 am
Hi all, this is my first thread on diyAudio. I don't know whether I post this thread here is appropriate or not. If not, please let me know.

I'm a newbee for HIFI audio. I was told the phase noise for MCLK of the DAC should be as low as possible. But for a typical phase nosie plot, there will be several number point on the plot from 1Hz, 10Hz, 100Hz, 1K, etc, and the phase noise's value would drop with the offset increasing. So here is the question: how to choose the right low and high integration limit to calculate the right jitter value. Is it correct to integration from 1Hz to 100kHz, or case by case?

BTW, If the phase noise performance is not so good, which performance will be sacrificed?

Thanks guys.


 

jcx

Member
2003-02-17 7:38 pm
..
audio wow and flutter frequencies aren't a problem with bog standard quartz xtal oscillators

perceptible audio band noise influence of digital audio clock phase performance isn't a simple 1:1 mapping

its hard to find a quartz xtal oscillator that approaches the 10s-100s nanoseconds for jitter human listening tested hearing threshold

there are other estimates of jitter requirements for sub 16th lsb added noise with 20 kHz full scale signal which are much smaller than anything it has documented that humans can detect
 

felixlee

Member
2014-12-22 1:25 am
audio wow and flutter frequencies aren't a problem with bog standard quartz xtal oscillators

perceptible audio band noise influence of digital audio clock phase performance isn't a simple 1:1 mapping

its hard to find a quartz xtal oscillator that approaches the 10s-100s nanoseconds for jitter human listening tested hearing threshold

there are other estimates of jitter requirements for sub 16th lsb added noise with 20 kHz full scale signal which are much smaller than anything it has documented that humans can detect

Hi JCX, would you mind to share more info of "sub 16th lsb added noise with 20 kHz full scale signal " test method? Thanks.