Home |
Search |
Today's Posts |
#2
|
|||
|
|||
"kbc" wrote in message
om Consider a sigma delta adc which first oversamples, does noise-shaping and then filters and decimates to give final output at Nyquist rate and with 16 bits per sample. For this final output, note that quantisation stepsize is uniform. Only for *perfect* sigma-delta ADCs. Sigma-delta ADCs tend to be more perfectable at a relatively low cost than other kinds, but they aren't totally perfect. Now, is it possible to get this same output using a normal adc for some sampling phase and uniform sampling of the analog signal ? Just find a *normal* ADC that is perfect. ;-) This is going to be harder, but you'll never find that perfect sigma-delta ADC to compare it to, so where's the beef? Or will it be correct to say that the final output is a non-uniformly sampled version of the original analog signal ? That's always true. It's just a matter of degree. ( I understood the functionality in freq domain, and am trying to figure out in time domain . ) I guess effectively, sigma-delta adc is equivalent to adding dither to analog signal and then using a normal adc. More or less. Sigma-Delta ADCs have artifacts of their own. I seem to recall something about limit cycles, etc. How does this question differ philosophically from debating the number of angels dancing modern ballet on the head of an antique dressmaker's pin? |
#3
|
|||
|
|||
(kbc) writes:
reposting (kbc) wrote in message . com... nobody reading this ?? (kbc) wrote in message . com... Hi, I posted this sometime back in comp.dsp. http://groups.google.com/groups?dq=&...p%26start%3D25 Dont think got the answer there. You mean you didn't get the answer you were looking for. I answered you at least twice on this. -- Randy Yates Sony Ericsson Mobile Communications Research Triangle Park, NC, USA , 919-472-1124 |
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Any 2 channel Souncard similar to Delta 44? | Pro Audio | |||
stupid newbie question - will the Delta 1010lt work for me? | Pro Audio | |||
Synching Muyltiple M-Audio Delta Cards | Pro Audio | |||
DELTA 44 problems when USB enabled (sorry...) | Pro Audio | |||
Use of 2 M-Audio Delta boards in parallel ? | Pro Audio |