In Reply to: Re: SACD ultrasonic noise irrelevant... posted by Christine Tham on September 14, 2005 at 14:44:22:
Chances are, if you are listening to a PCM recording that has undergone dither at some stage in it's lifecycle, it will contain ultrasonic noise, in many cases similar to DSD ultrasonic noise.Check out the following URL for comparisons of noise shaping curves for various dithering algorithms. What the diagrams don't show of course is that the noise shaping continues into the ultrasonics, and most algorithms work on the principle of shifting noise from the audible band up into the ultrasonic spectrum.
In this respect, DSD is no better or worse than any of the commonly used algorithms.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Forgot to mention, most PCM dithering algorithms generate similar ultrasonic noise - Christine Tham 20:42:40 09/14/05 (13)
- Slight correction... - Frank.. 02:54:35 09/15/05 (12)
- 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)
- Exactly right. Besides we're talking about audibilty... - meisterkleef 08:26:56 09/15/05 (5)
- Re: Exactly right. Besides we're talking about audibilty... - Christine Tham 14:09:33 09/15/05 (2)
- Re: Exactly right. Besides we're talking about audibilty... - evector 18:22:03 09/16/05 (0)
- Great charts! Thanks! (NT) - meisterkleef 10:41:08 09/16/05 (0)
- Another slight correction.. - Frank.. 11:07:28 09/15/05 (1)
- Thanks! I differentiated because PCM is filtered above passband. (NT) - meisterkleef 13:11:17 09/15/05 (0)