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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Ok, y'all know about digital recording and sampling, then? posted by Silver Eared John on November 17, 2005 at 19:23:29:
Ok, tell me then, does dithering:
1) Get rid of correlated artifacts due to quantization completely (no, won't get rid of correlated artifacts due to anything else)
2) Get rid of them partially
3) Mask themThe answer is "2".... For dither is not a "perfect" solution to the quantization error problem.
What is the interchannel resolution (in time units)of a high frequency signal between the two channels of a Redbook CD. Pick the answer that's closest.
1) 1/44100 seconds
2) 2/44100 seconds
3) 1/(44100*65546) seconds
4) pi/(44100*16484) seconds
5) 1/(pi*22050*65536) secondsThere is no "closest" answer.... For each system has an error that is different.... And likely for different reasons.... And most systems have an error low enough to where this has almost never been an issue.
What is the meaning of the "beating" that is reported to occur when a sine wave near 20kHz is sampled at 44100 Hz?
1) It shows that the sampling theorem doesn't work.
2) It shows that somebody forgot to use an anti-imaging filter
3) It shows that somebody put the probe at the wrong place in the circuit
4) It shows extra in-band sine waves that result from sampling errors.Once again, there is no good answer listed... The only way the "beats" would occur is if one chooses a D/A chip that is non-oversampling or utilizes a "time-resolute" digital filter....
And by the way.... How can someone "forget" to use an anti-imaging filter?? It would be like someone building a car and "forgetting" the wheels.... For unless one *expressly* specifies a non-OS D/A converter chip, the D/A chip has the anti-imaging filter *already* built in!!
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Follow Ups
- Ignorance..... - Todd Krieger 20:42:47 11/20/05 (0)
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