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發表於 2023-11-3 22:51:42
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Hi Relax hing ,
For Rockna & MSB , they can decode in NOS or up sampling fashion, selected by user. 唔一定係 upsampling 的呢.... 係menu 內選擇呀.
而 WLS 之所以比我地選擇是否要 FPGA upsamping or re-sampling or bit perfect, 就是比我地選擇呢. 之前試過某一個品牌DAC , 全部convert 做 24/96最好聲. 佢自己內部係 FPGA DAC 來的.
所以我覺得, WLS 的做法, 比我地選擇 bitperfect or re-sampling , 是想比我地 mix & match自己部DAC. 佢只是確保佢用哂粒FPGA CPU, 唔行 OS , 已最低latency 的做法做好佢.
如果match 的一部DAC , 佢唔受 . 就變返 bitperfect 呀 (in the backend app) ...... 咁個 FPGA CPU 就只用 internal femto clock 做bit perfect re-clocking , 再出 AES / coaxial and I2S 呢. 有得選擇呢.
而Rockna DAC and MSB DAC can do NOS mode, 咁你即係將 upsampling 提前係 WLS 做左, 而 MSB/ Rockna 就入到去, 唔做. 可能個latency 可以再低一點. 但我還未試! bit perfect to DAC and let DAC do upsampling , 定係 Server do hardware upsampling and DAC do NOS decode 好一點.
下星期報告你知,
blau
VOLENT
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