HQplayer 7ec升频dsd可能是不归路

鱼花

这类超迷你主机或电脑棒也是一个选择，还有支持gpio40的一些x86开发版(up board　，Tinker　board)  也很好的可玩性或扩展性，因为一些树莓排派的hat套上也一样可以用。改晶振，改数字输出板也方便。

up board 升频768，大约30秒左右会一卡，可能散热不行？

鱼花

seeteeyou 发表于 2021-7-31 07:48
https://audiophilestyle.com/forums/topic/62699-a-toast-to-pggb-a-heady-brew-of-math-and-magic/

PG ...

生成的dsd文件再听？没搞过呢.
7ec dsd真的是不归路，太难了

鱼花

seeteeyou 发表于 2021-7-31 14:02
暂时 PGGB 的一众用家都有 Taiko Audio SGM Extreme 或者 Antipodes Audio K50 那种旗舰级别的数播，ASDM7E ...

8G主频，真的不可能的是了，民用主机话。

之前部过作者可不可以利用 fpga的pice版去解决呢，他回答成本更高，还有主流卡主频太低。

鱼花

clark8888 发表于 2021-7-31 15:03
PGGB有点像挖矿，需要大内存，大硬盘。 还是HQ的on the fly及时运算升频更现实， pro测试玩一下

有竟争者才有进步

鱼花

seeteeyou 发表于 2021-7-31 14:02
暂时 PGGB 的一众用家都有 Taiko Audio SGM Extreme 或者 Antipodes Audio K50 那种旗舰级别的数播，ASDM7E ...

要是下载官方软件就可以线离进行吗？还要接解码器？？


请教：WavPack 格式用什么解码器？是要支持nos的才可以真正还原？？

本地机sata　4T硬盘不行吗？？生成文件有多大？？




不河蟹话，不好玩。
还是老实hq

鱼花

clark8888 发表于 2021-9-5 11:32
"NOS 模式是先决条件，没有 NOS 模式的话就无法避免二次升频的问题"

怎么会二次升频呢

鱼花

clark8888 发表于 2021-9-9 12:31
我是引用他的原话。但是这张图能证明什么

你理解错作者原话吧？
nos会有什么差别，我猜你还没答案 。

鱼花

clark8888 发表于 2021-9-9 14:53
"NOS 模式是先决条件，没有 NOS 模式的话就无法避免二次升频的问题" 是seeteeyou说的。  没有确切证 ...

nos最大功效是，扰过数字滤波。

鱼花

处理器 发表于 2021-9-9 17:13
换个名字，不是真正NOS，像拓品的解码器中文和英文说明书也是这样玩。

那这个价位的船－6呢？

鱼花

处理器 发表于 2021-9-9 17:13
换个名字，不是真正NOS，像拓品的解码器中文和英文说明书也是这样玩。

找到对应的

1. Some other dacs like some of the teac and ifi dacs have a 'pseudo-NOS' option made possible by the architecture of the burr-brown chip it seems. Though it's not actually NOS all the way through. The top 6 bits are though.
   
2. 
   
3. Others like the ADI-2 and more recent AKM dacs have a 'super slow' filter which is basically a zero-order-hold OS filter. Still OS, but produces a result very similar to actual NOS.

复制代码

"NOS" in these cases means it bypasses the 8x digital filter, and just leaves the zero-order-hold OS in place. Same for TI and AKM.

DAC chips just don't have enough DSP power to run proper 256x or higher digital filters, so they typically have digital filter up to 352.8/384k rate and rest is just OS by copying same sample N times.

However, TI chips pass DSD inputs straight to analog FIR conversion stage and now AKM chips have similar feature feeding DSD data straight to their SCF conversion stage. So DSD inputs can be true NOS. This allows running proper 256x or higher digital filters and high quality modulators not constrained by the on-chip DSP.

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RME has DSD Direct mode for playing DSD. And for PCM it has digital filter disable option. And if you input 352.8 - 768k PCM it's digital filters are bypassed anyway. With PCM input it is however always oversampling (at least with S/H aka ZOH).

Holo being more similar to the DAC8 DSD as having two separate DACs for PCM and DSD. But with the difference that also PCM side is discrete R2R and both PCM and DSD side can be run NOS without digital filters.