ericintpe wrote:
迫不急待的，先來欣賞(恕刪)
要來說說聆聽一天之後的心得了！
先說結論(依照開機發聲>>欣賞聆聽>>持續沉浸音樂中)：
聲音剛傳入耳中，讓人嚇一跳---太美妙的音樂呀！
音樂持續播放，你更會驚異的發現，這麼精簡的系統竟然有如此微妙的聲音！
既熱情又嚴謹的詮釋音樂(真是矛盾的形容)
聲音的描述實在是一大難題，只能歸結一句話：
只可意會(親身聆聽)，無法言傳！
反正聽得愈久，你就愈沉浸其中，愈不想結束它…
廠商的網頁淡淡地介紹其特點：
升級後聲音兩端延伸加強，通透乾淨，細節清晰。
一點都沒有加油添醋，而且越聽越好聽，會有欲罷不能強烈感覺。
孰悉的專輯乍聽起來，怎麼感覺變慢了？
其實是演譯得更完整，更加淋漓盡致，
細節更清晰、更到位，讓人容易聽到以往不曾聽過的樂器聲音。
最終我給OCXO 時鐘板的形容就是：
(重劍無鋒 大巧不工)
外表簡單樸拙，一點都不起眼，
也不需要加電源淨化板(事實上也無法加上去/即使用到GPIO的長排針)；
只需用兩顆GaN充電插座(一個給樹莓派4B，一個給時鐘板)，一切搞定！
沒錯！OCXO時鐘板系統就是樹莓派世界裡的(屠龍寶刀)了！
觀人年少成鴻業；憐我有歲無寸名。
v0911 wrote:
要再往上堆的話 可以(恕刪)
如果你有一部不錯的USB DAC，這套OCXO極簡的播放器，絕對可以滿足你對聲音的要求！
如果想要往上再加入其他的I2S輸出板，我建議你可以考慮參考我的---
雙劍合璧---玩法
會有如何驚人的效果呢？
且待.....
觀人年少成鴻業；憐我有歲無寸名。
ericintpe wrote:
如果你有一部不錯的USB...(恕刪)
插播報導：
雙劍合璧方案竟然引起Iancanada的關注：
Originally Posted by Lerictpe168 View Post
It is exactly what I have done!
No matter it plays Native DSD or PCM, it is very good, there is no problem at all.
In addition, the software I use is moOde or piCorePlayer
Attachment 979580
@Lerictpe168
That's an interesting project. Thank you for sharing the experiences.
If I'm not wrong, it should be a PLL board with a 10MHz OCXO as reference clock input. It has two outputs, 25MHz and 54MHz.
What I'm concerned about are:
1. OCXO has lower phase noise and higher frequency stability than normal XOs, that's for sure. But after the PLL, are those 25MHz and 54MHz clocks really better than the original XO crystal oscillators on the RPi? If yes, better for what? Close-in phase noise? phase noise floor? or both?
2. Both 25MHz and 54MHz are not the finial audio clocks of a RPi, the real audio clocks are generated by another digital PLL inside the RPi SoC. So the audio clocks from RPi always have very big systematical jitter (more than 600ps, please see the measurement result below). With this solution, can the finial audio clocks of a RPi really benefit from?
3. What are the other possible benefits for the sound quality?
Thanks again, just hope I can buy one to make some measurements.
Regards,
Ian
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
PS.
原post：
https://www.diyaudio.com/forums/digital-line-level/192465-asynchronous-i2s-fifo-project-ultimate-weapon-fight-jitter-717.html#7170
回覆文：
https://www.diyaudio.com/forums/digital-line-level/192465-asynchronous-i2s-fifo-project-ultimate-weapon-fight-jitter-720.html#7194
觀人年少成鴻業；憐我有歲無寸名。
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