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In Reply to: Slight correction... posted by Frank.. on September 15, 2005 at 02:54:35:
*** "What the diagrams don't show of course is that the noise shaping continues into the ultrasonics"
The noise energy can only be distributed within the systems bandwidth if pcm is used. ***If you look at the diagrams, they all cut off at 30kHz. What I said was (and I think you are agreeing with me) that the noise shaping continutes beyond 30kHz into whatever the upper limit is.
*** With pcm this depends on the hardware/software algorithms used. ***
Well, that is a moot point, since there will be embedded noise in PCM whenever delta sigma A/D is used. The only way you can avoid ultrasonic noise is by using ladder A/D (which has linearity issues) or by generating waveforms synthetically.
There is also additional ultrasonic noise generalted by sigma delta DACs, above and beyond noise embedded in the recording. My sound card implements a filter that is down -2dB at 50kHz to counteract this noise.
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Follow Ups
- Corrections to your corrections! - Christine Tham 13:55:25 09/15/05 (5)
- AD converter issues.. - Frank.. 03:06:28 09/19/05 (0)
- Re: Corrections to your corrections! - Frank.. 23:32:39 09/18/05 (0)
- If you've ever used any of Philips' DSD software, Frank... - Michi 14:27:48 09/16/05 (2)
- Re: If you've ever used any of Philips' DSD software, Frank... - Frank.. 23:37:19 09/18/05 (0)
- Interesting! I did not know that! (nt) - Christine Tham 15:48:41 09/16/05 (0)
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