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In Reply to: OK... posted by ducati on April 27, 2003 at 07:35:57:
Here are some excepts from a paper presented to AES.--------------------------
At 750kHz the signal is only 10 dB down. Hence, it is clear that DSD as a carrier provides a signal bandwidth which exceeds 100kHz by far. Obviously, the SNR decreases for high frequencies.
As far as experimental evidence shows [17] the human auditory system is sensitive to ultra sound only if it is correlated with the signal in the 0-20 kHz band, hence, the increase in noise at high frequencies is not important. The excess in bandwidth can subsequently be used to allow for very slow low-pass filtering, which keeps the time response very accurate.
This effect is clearly illustrated in Fig.9. The impulse responses of 4 different systems in a multichannel configuration is depicted : a 48 kHz system, with a bandwidth of 20 kHz (that is, 8 kHz transition bandwidth is allowed for anti-aliasing filtering), a 96 kHz system with 35 kHz bandwidth (26 kHz transition bandwidth), a 192 kHz system with 75 kHz bandwidth (42 kHz transition bandwidth) and an SACD system with 96 kHz bandwidth. Though none of the systems reproduces the input exactly, the DSD system shows the least artifacts.
Clearly, the 48 kHz system has great difficulty in reproducing the click; due to the steep filtering it starts ringing at a -30 dB level approximately 1ms before the click, which is very audible. Also at the higher sampling frequencies, the rining phenomenon cannot be remove, though it is reduce significantly. Only the DSD system is very effective in suppressing the ringing effect, due to very slow filtering above 95 kHz.
....
read stuff about bit rates
....
Moreover, it is argued that the DSD format complies with the minimal requirements set by the human hearing system in order to avoid audible artifacts caused by digitizing the analog signal. For example, the minimal sampling rate needed is about 350 kHz, which is not covered by a 192kHz PCM recording. Moreover from 20 kHz and onwards the neccessary signal-to-noise ratio becomes increasingly less important, which is in concodrance which the natural behavious of a SDM. Due to the latter feature of DSD, the signal becomes very bit-efficient compared to existing PCM formats closest to the afore mentioned minimal requirements. These statements include lossless coding for both kinds of signals. For example, on SACD a 6-channel DSD recording of 95 minutes can be stores where for 20bit 192Khz PCM only 55 minutes can be stored.
http://www.sacd.philips.com/b2b/downloads/dsd_2.pdf
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Follow Ups
- Why DSD is the best choice as a digital format : Read the PDF - SnaggS 00:44:42 04/29/03 (15)
- It's not. This document contains too much marketing rubbish.. - Frank 13:19:54 04/29/03 (4)
- Meridian debunk your comments too, seems most scientists do. - SnaggS 15:02:42 04/29/03 (3)
- You're not a scientist... - Frank 15:22:31 04/29/03 (2)
- Just out of interest, whats your thought on midband - SnaggS 16:19:12 04/29/03 (1)
- PCM - Frank 14:31:00 04/30/03 (0)
- Re: Why DSD is the best choice as a digital format : Read the PDF - ducati 06:11:33 04/29/03 (9)
- Re: Why DSD is the best choice as a digital format : Read the PDF - SnaggS 06:44:16 04/29/03 (8)
- Good arguments but.... - RdH 07:56:24 04/29/03 (5)
- Yes and No - SnaggS 08:19:25 04/29/03 (4)
- Re: Yes and No - Frank 13:06:24 04/29/03 (3)
- Grasping at straws. - SnaggS 15:04:10 04/29/03 (2)
- Nope.. - Frank 15:37:19 04/29/03 (1)
- Thats the day I'll stop buying music.... - SnaggS 16:15:24 04/29/03 (0)
- Re: Why DSD is the best choice as a digital format : Read the PDF - ducati 06:58:31 04/29/03 (1)
- Re: Why DSD is the best choice as a digital format : Read the PDF - SnaggS 08:05:17 04/29/03 (0)
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