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In Reply to: RE: jitter sensitivity posted by sbrians on June 23, 2014 at 13:10:56
Upsampling without noise shaping will not increase jitter sensitivity, because sensitivity depends on the rate of change of the audio signal. However, upsampling with noise shaping may increase jitter sensitivity, because high frequency noise added by the shaping process increases the rate of change of the audio signal.
Delta sigma DACs use noise-shaping, making them potentially more sensitive to jitter than other types of DAC, such as NOS ladder DACs and OS ladder DACs. The amount of increased jitter sensitivity will depend on details of the noise shaping process, e.g. it will be larger if a lot of noise shaping is used (as with a 1 bit DAC) and less if only a little noise shaping is used (as with an 8 bit DAC).
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
I did not know that there were 8-bit DACs.
Where does one see those in use?
The SABRE DAC chips take the input format and convert it to 32 bits, perform volume adjustments if selected, convert to the high master clock rate (e.g. 1024x( and then noise-shape down to 6 or 8 bit format. When running in 8 channel mode the actual DAC is 6 bits wide (64 switches per channel) while running in 2 channel mode the DAC is 8 bits wide (256 switches per channel). The specific current output into the load depends on the desired level, which is encoded by the number of switches that are turned on or off. (This is described in the white paper, and more details can be found in the ESS patents.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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