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发表于 2022-7-9 21:39
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本帖最后由 xieqiao 于 2022-7-9 21:54 编辑
我这个多年前的帖子,主要还只是涉及耳机,近年来陆续更新了音响设备,发现其实好多发烧友追求发烧音响的目的是寻找传统模拟音响的音色,而这里解码器是关键。最近反复读了一篇比较Delta Sigma和NOS R2R DAC解码器的文章很精彩,发现其中有几段很精辟,而给R2R解码器升频其实是画蛇添足。
https://sw1xad.co.uk/delta-sigma-vs-nos-r2r-dac-designs/
The analogy is akin to comparison of pictures taken with a) a camera equipped with proper optical lens (non-oversampling R2R DAC) and b) with a camera taken with a digital zoom and a lot of DSP post-processing, done by the software and hardware of a camera (DS DAC).
这个类比类似于比较 使用
a) 配备适当光学镜头(非过采样 R2R DAC)的相机拍摄的照片 和 使用 b) 数码变焦和大量 DSP(数字音频处理器) 后期处理的相机拍摄的照片,由相机(DS DAC)软件和硬件共同完成。
Pictures taken with a) have sense of depth, are more natural in their textures and are smoother in their transients. There is no post-processing and all original data is presented more or less as captured. Pictures taken with b) are flatter, textures are more synthetic and are edgier in the transients as post-processing was applied to interpolate the missing data and all results heavily depends on post-processing algorithm chosen. The same pretty much applies to the sonic presentation. There is obviously more to it than whether the DAC is DS or R2R type but overall it is a valid analogy as long all other variables are kept equal.
使用 a) 拍摄的照片具有深度感,纹理更自然,瞬态更平滑。 没有后处理,所有原始数据或多或少都以捕获时的形态呈现。 使用 b) 拍摄的照片更平坦,纹理更以合成形态呈现,并且在瞬态方面处理得更锐利,因为应用了后期处理来插入丢失的数据,并且所有结果在很大程度上取决于选择的后期处理算法。 这几乎同样适用于声音演示。 显然,除了 DAC 是 DS 还是 R2R 类型之外,还有更多的问题,但总的来说,只要所有其他变量保持相等,它就是一个有效的类比。
One can have R2R design with oversampling and that design is not much better than Delta Sigma because of the digital filtering involved and is a sort of the worst of both worlds. As matter of fact most commercially available TDA154X CD players came with oversampling, usually with a SAA7322 chip (that is perhaps the reason why most people think that those old R2Rs are obsolete).
可以使用带有过采样的 R2R 设计,由于涉及数字滤波,该设计并不比 Delta Sigma 好得多,是一种两头吃亏的最糟糕的情况。 事实上,大多数市售的 TDA154X CD 播放器都带有过采样功能,通常带有 SAA7322 芯片(这可能是大多数人认为那些旧 R2R 已过时的原因)。
我用泉3(纯NOS R2R)和如今代表DS阵营天花板的双AK4499芯片DAC-A22作了比较,都通过Holo Audio的晴前级,A22还接了泰坦鸟USB处理器。不比不知道,结果发现两者音色有明显不同,毕竟一分钱一分货,仿佛泉3是经过水晶播放,而A22是经过木块播放,尤其是涉及人声时。泉3适合泡杯茶慢慢品味,余音袅袅,浮想联翩,给人留下丰富的联想空间。当然,A22也不是吃素的,有些温柔,又不过于做作,如果没有参照的话,其实调音还是到位的,深谙中庸之道。
补充内容 (2022-7-11 10:14):
另外,想要获得类比模拟的自然宽松味,最好不要用D类功放以及主动式有源音箱。我只是在家庭影院系统中用有源音箱。 |
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