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本帖最后由 chenzhaoyi 于 2014-6-26 22:12 编辑
回复 jasonzhangy 的帖子
德国MBL给我回复了,终于有了明确答案。
Dear Chenzhaoyi,
Many thanks for your mail and the expressed interest in our product line.
In fact a USB input would be the best possible signal into the D/A-Converter. For the price of an upgrade please contact your local dealer.
The USB (and all the other digital inputs) will only accept 96kHz - but with a timing accuracy of a 192kHz signal. To give you some background on this I copy sentences from our chief engineer send to a reviewer:
"1. Jitter. Whenever you are going to higher Sample Rates, you have to increase the bandwidth of the input receiver and so rise the jitter. About 15 years ago, when we went from 48K max to 96K max, we have had about two times higher jitter, but still by far low enough. So we went for 96K in serial production.
2. It is fact, that everyone can not hear above 20 kHz, but this states only for steady state signals. But the ear can hear about 4 times finer in timing, that what a 20 kHz does ring. So, you do not hear for example a 30 kHz tone alone, but you do hear if 20 kHz does arise or decay differently. So now comes the trick. We have psycho acoustically optimized the digital oversampling filter in that way, to have an relation between Pre-Ringing and Post-Ringing of 1/5 to 4/5. So our digital filter sounds like a 4-times higher sample rate.
3. When we sum up point 1 and 2. With our latest DAC technology, we have the low jitter performance of a 96K max Interface but have the timing accuracy of a 192 kHz Sample Rate. We do convert every incoming sample to 352.8 kHz / 384 kHz to get this timing accuracy. I know this is a bit difficult to understand just in some sentences, because this is mostly based on psychoacoustic, but because I am coming from making music, over recording music, I know how it should sound when playing back music.
4. And additionally, I can assure you, that there is no music that have higher frequency contents in it as about 40 K. So when you are able to play back this 40K max, with a correct timing (ringing) as I described above, than even for bats, you reproduce every recorded sound correctly. So when you have for example a 192 K file, and you play it back as 96K file, with our psycho acoustic optimized filter, there is nothing lost, but you have lower jitter. No audio content is lost.
5. Just give it a try. Take your computer and set up either AudirvanaPlus (for Mac) or JRiver (for Mac & PC) and play back a 192 K or even 384 K file on an regular 192 DAC and compare this sonically with the playback of the down sampled to 96 K sample rate, with our psychoacoustic optimized filter you can judge my saying. Trust your ears."
Mit freundlichen Grüßen / Kind regards
Sales Manager
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