修改WM8741播放DSD達成_23#真正實現DSD_PCM解碼

zoneaudio · 發表於 2013-6-3 16:53

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本帖最後由 zoneaudio 於 2013-6-25 20:47 編輯

首先準備一件usb to dsd轉換板,
單粒WM8741平價DAC一部,
跟據Datasheet要求一步一步做是無難度的,

edison133 · 發表於 2013-6-4 11:05

Ching, 你D diy 功力真係出神入化!
現在play pcm 要 switch mode 嗎?

zoneaudio · 發表於 2013-6-4 12:37

edison133 發表於 2013-6-4 11:05
Ching, 你D diy 功力真係出神入化!
現在play pcm 要 switch mode 嗎?

只是固定dsd mode........

edison133 · 發表於 2013-6-4 12:41

zoneaudio 發表於 2013-6-4 12:37
只是固定dsd mode........

So you need to design one logic switch to switch PCM and DSD modes right?

zoneaudio · 發表於 2013-6-4 15:40

edison133 發表於 2013-6-4 12:41
So you need to design one logic switch to switch PCM and DSD modes right?

純粹試驗一下, 要轉換有排攪

edison133 · 發表於 2013-6-5 08:58

zoneaudio 發表於 2013-6-4 15:40
純粹試驗一下, 要轉換有排攪

add oil!!

8po · 發表於 2013-6-24 16:49

Hi zoneaudio Ching,

I did the same as you achieved and I like the sound of WM8741 very much. If your DAC board is running in HW mode, you can try connect the DSD_ON pin on your USB receiver to the PIN27 of WM8741 IC. When the USB receiver get DSD signal from your player, DSD_ON pin will be on Hi position, i.e. 3.3V; PIN27 of WM8741 detect there is Hi (3.3v) it will switch to DSD mode. Forgive me my suggest is very preliminary or just a idea for you since I don't know much about the config of your DAC board.

zoneaudio · 發表於 2013-6-24 18:09

8po 發表於 2013-6-24 16:49
Hi zoneaudio Ching,

I did the same as you achieved and I like the sound of WM8741 very much. If you ...

多謝師兄提點,

正在研究中將會自動化轉換,
dsd_on out 3.3v 這個已知,
wm8741的i2s跟dsd訊號不是共用的,
由pcm轉dsd,再由dsd轉pcm有好多問題要處理,
不是pin27,Hi / Lo這麼簡單,還有轉換時mute訊號都要處理,
pin22都係一個問題

8po · 發表於 2013-6-24 18:17

zoneaudio 發表於 2013-6-24 18:09
多謝師兄提點,
正在研究中將會自動化轉換,
dsd_on out 3.3v 這個已知,

I connect both board with all 6 wires. The DAC can switch between DSD and PCM in HW mode, however it will have pop pop sound when switching mode. I will make use of the mute pin on USB PCB to control the analog mute on 8741. The biggest question for me is change the i2s format for PCM input.......i'm will exploring......nice sharing with you.

PS i'm using voyage MPD too

zoneaudio · 發表於 2013-6-24 20:35

本帖最後由 zoneaudio 於 2013-6-24 20:42 編輯

8po 發表於 2013-6-24 18:17
I connect both board with all 6 wires. The DAC can switch between DSD and PCM in HW mode, however ...

你的wm8741是什麼板,PIN22怎樣處理?
在PCM時是控制濾波器工作,有Hi _Z_Lo,而DSD是DSDR,
你接六線播dsd,左右聲道沒有反轉嗎?

[討論] 修改WM8741播放DSD達成_23#真正實現DSD_PCM解碼

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