NAS Streaming可以比CD靚聲嗎？CH Precision C1來告訴你

nickif

diamondblack 發表於 2014-7-21 20:20
Instead of ripping across different machines, have you tried ripping the same cd using the same ma ...

I'm not crazy enough to have tried to compare ripped files from difference cd drives, however I did try with different ripping softerwares, they do make a difference and this should be measurable.

petertang88

Bubble 發表於 2014-7-21 21:38
Adyc 兄， thank you so much putting information to this track.

May I try to wrap up what your poi ...

Bubble兄，

一般我們說的LAN是TCP／IP，是以數據包的方式傳送，即是一個檔案分成很多次傳送。數據包從A點到B點（eg. NAS to  DAC）是有可能會壞掉的, 如果壞了的話，接收方會叫發出方再傳送。

如果不是播歌的話，貴與平的Lan線最後的傳送結果是一樣的，但平線可能要多點時間才能完成。

在播歌的時候，分別便出來了。因為所需要的數據是需要在指定的時間內收到。情況有點象看網上的圖片，網絡不好時，圖片開始會比較差，一步一步才變好。

所以好的LAN線在player需要時提供足夠的資料，差的線只提供了部份的資料，播出來的聲音便會有分別。

petertang88

nickif 發表於 2014-7-22 01:05
I'm not crazy enough to have tried to compare ripped files from difference cd drives, however I di ...

because ripping is not just copying, it involve format changes most of the time, so different software are likely to produce different result.

diamondblack

adyc 發表於 2014-7-21 20:56
How about I rip the CD with a laptop using battery? There is no switching power supply. It is as D ...

I agree that's a cleaner source of electricity.

If you cannot hear a difference, so be it. You are the lucky ones.

Bubble

petertang88 發表於 2014-7-22 01:14
because ripping is not just copying, it involve format changes most of the time, so different soft ...

這個説法是不是就是即使rip出來的checksum一樣，但都會引致聲音不同的原因來？

adyc

Bubble 發表於 2014-7-21 21:38
Adyc 兄， thank you so much putting information to this track.

May I try to wrap up what your poi ...

When one streams data from NAS to DAC, lan cable will most likely transfer noises from NAS together with data. Noises may confuse DAC and increase jitter. Furthermore, these noises may creep to your amplifier and your amplifier may send these noises to your speaker. Electrical noises is No.1 enemy in music playback. That's why a lot of C-hings in here try to keep the noises as low as possible using cable, LPS,... etc.

However, when one transmits data from NAS to computer, TCP protocol will ensure the data is transmitted and written to harddisk correclty. Since the file is just a stream of 0 and 1, if the noises corrupts the file, the copied file will have different stream of 0 and 1. For good checksum algorithm, different stream of 0 and 1 will produce different checksum numbers. That's why when two files have the same checksum, you are pretty sure the files are the same with the confidence level almost 100%.

adyc

petertang88 發表於 2014-7-22 01:14
because ripping is not just copying, it involve format changes most of the time, so different soft ...

I do not want to go through your argument ripping may change the data on CD to computer. However, when two different software produce the same checksum ripped files, why would be a difference?

阿鐵

diamondblack 發表於 2014-7-22 06:40
I agree that's a cleaner source of electricity.

If you cannot hear a difference, so be it. You ar ...

黑鑽兄，你是黑五類，不要多事，妖言惑眾

nicknick

阿鐵 發表於 2014-7-22 09:45
黑鑽兄，你是黑五類，不要多事，妖言惑眾

我都叫咗佢慳返啖氣㗎啦。

obee

其實大家講出左大家的觀點, 主觀又好客觀又好就OK.

我看完, 有些我同意, 有些不同意. 我覺得聲音重播當中太多變數, 有些看似很有道理的客觀事實, 其實可能有些人類未知的變數在當中. 因為人類談的物理, 數學, 電腦, 心理學等只是基於人類文明發明發現出來, 有些事情在今天的人類文明或者未知. 這也是snake oil 由來的一個主要原因.

與其在把已知的客觀事實不斷重申, 倒不如番去起點, 當自已乜野物理, 數學, 電腦都唔識, 以赤子之心去做一些測試, 自己聽聽或SEND 俾朋友聽聽, 叫佢地COMMENT下有無分別. 當然朋友聽到乜也只係個參考, 自己聽到乜先最重要. 都係果句, 太多因素!!!

實踐是檢驗真理的唯一標準

petertang88

Bubble 發表於 2014-7-22 07:49
這個説法是不是就是即使rip出來的checksum一樣，但都會引致聲音不同的原因來？ ...

不是，我也覺得checksum一樣的file在相同的播放情況下聲音應該一樣。起碼我想不到不同的原因。

我說ripping時很多時候有格式的轉換，是指在CD時是保存的檔案格式是CD-DA，但最後我們得到的是wave，mp3, aiff etc. 不同的軟件在轉換過程中生出的最後檔案, 同樣是wave格式的話，也可能有所不同，checksum 也不一樣。

diamondblack

nicknick 發表於 2014-7-22 10:39
我都叫咗佢慳返啖氣㗎啦。

鐵兄同nicknick兄這樣說...... 我沒辦法

mahi

玩hifi都是不要傳道，好易搞到打大架！

佛家話齋。。。隨緣吧，今日未聽到即係緣份未到遮，又或著未夠六根清淨遮。

obee

玩HIFI好多野可玩, 好多時要做到好 extreme 唔難, 但要取個平衡唔易. "The Law Of Diminishing Marginal Returns" 話, 當你好大投放但回報好少, 係時侯諗諗應唔應該去尋找其他可以玩得更好聲的地方.                                                                                                                        

Bubble

petertang88 發表於 2014-7-22 11:04
不是，我也覺得checksum一樣的file在相同的播放情況下聲音應該一樣。起碼我想不到不同的原因。

我說ripp ...

多謝詳盡解釋分享。

Bubble

adyc 發表於 2014-7-22 09:24
When one streams data from NAS to DAC, lan cable will most likely transfer noises from NAS togethe ...

多謝詳盡解釋分享。

阿鐵

nicknick 發表於 2014-7-22 10:39
我都叫咗佢慳返啖氣㗎啦。

咪係，自己係傻佬都唔知，仲係到大大聲講歪理

阿鐵

diamondblack 發表於 2014-7-22 11:07
鐵兄同nicknick兄這樣說...... 我沒辦法

算你有自知之明

里克1

個討論令我呢個非電腦人用家知道多咗. 幾好幾好.

petertang88

Bubble 發表於 2014-7-22 11:33
多謝詳盡解釋分享。

其實小弟也沒甚麼經驗，只是紙上談兵