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本帖最后由 lszyc 于 2017-2-25 11:11 编辑
1bit就是1bit,这个没什么好说的,比较公认分析和测量都表明DSD64和20bit 88.2K的PCM音频相当,考虑DA的因素,我可以认同相当于24/88.2的数据:
MEASURED PERFORMANCE
DSD is a high-resolution digital audio format, and few recordings can fully utilize the SNR and bandwidth available in the DSD format. Nevertheless, the measured performance of DSD falls between that of the CD and 96 kHz 24-bit PCM. DSD can achieve a 120 dB 20 Hz to 20 kHz SNR with a usable bandwidth of about 50 kHz. For this reason, DSD is almost exactly equivalent to a 20-bit 96 kHz PCM system. Notice that I said "20-bit" and not "24-bit". In theory, a 24-bit system is about 24 dB quieter than DSD, but it is virtually impossible to use all of the available SNR in either system.
90年代CD初盛时,1bit和16bit的DA,是两条路,但现在音频工业方面已经基本统一了,那就是两者结合,做5bit左右的delta-sigma,看看性能好点的音频AD和DA芯片,基本都是这种结构。
如果带外噪音大是优点,那PCM结构的DA通过简化滤波器,也可以做出很大的带外噪声。
https://benchmarkmedia.com/blogs ... eam-from-a-d-to-d-a
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