The reason,I think,which causes the transformed data different from the original should be the main question.
Forgive my poor English.I'm not an expert.If I've been far away from the topic,please ignore me and go on
![:$](./images/smilies/icon_redface.gif)
Peace and cheers.
版主: DearHoney
The argument in your first paragraph is wrong.Ares 寫:I just wonder that adobe audition(or Cooledit Pro) made the line between dots for visualization,but it didn't apply any fomula to the curve,that is to say,the waveform consists of time information and amplitude,not the formula.In that case,I think figure 10 is ok,although it may not be very precise and suitable for some case.Whether it presents as curve or histogram,the waveform is just amplitude vs time at all...
The reason,I think,which causes the transformed data different from the original should be the main question.
Forgive my poor English.I'm not an expert.If I've been far away from the topic,please ignore me and go on![]()
Peace and cheers.
Sorry if I made your misunderstanding.I know the Nyquist theory and the restoration of 1/2 Nyquist frequency.Maybe we are telling different stroies.I guess Ssss1 didn't intend to talk about the signal which has been reproduced at the final stage,but he focused on the digital part before the data being regenerated by the DAC.I didn't said anyone is incurrect,but I just want to said maybe Ssssss1's intention is to explain why the different sampling rate will cause those controversial results and he try his best to put everything into a simple explaination.I think a working SRC is the most interesting part in this topic and many prople are willing to see what really happened in SoundCard's SRC and SSRC.JamesT 寫: The argument in your first paragraph is wrong.
Pulse Amplitude Modulation, as a modulation, which means to represent something via another form, is meant to represent continuous signal via discrete pulses. The "continous signal" mentioned above equals the "formula" in your words. The reason why discrete PAM can represent continuous signal is -- the Nyquist sampling theory. Signals of 1/2 sampling frequency or lower can be losslessly represented by means of PAM provided you have absolute accuracy and infinite arithmetical capability.
I suggest you post articles in a language which you handle better than English, lest you cannot accurately express things in your mind and may result in more misunderstanding. And if you intended to be ignored in the first place, you shouldn't have posted anything at all.
Yes,I know and thank you for your comments.I read the entire argument again and I finally realize what all of you are talking about.I think Sssss1 is talking about AD,and other people are talking about the representation of DA.I guess Figure 10 is not the picture of the final DA result,but the initial process of AD.Maybe that is why make us so confused.JamesT 寫:To Ares,
ssssssss001 在他第一篇發言(本討論串第3頁)當中,對於數位取樣的描述以及示意,是有一些錯誤的,這是無可否認的。這與他想針對什麼東西做討論並沒有關係。
關於「許多人想知道音效卡的 SRC 與各種軟體 SRC 例如:SSRC、PPHS、KMixer...等,它們到底真的做了什麼...」這一個問題,我想提出一個此問題背後的問題:請問這些人他們想要瞭解這個問題,其動機為何?請問這些人他們想要瞭解這個問題,是想瞭解到哪個程度?
事實上,在這個討論區當中,要將這類涉及工程專業的問題圓滿的呈現給所有閱讀這個討論區的人,是有相當大的困難的。因為每一位不同讀者的需求,存在著相當大的差異,而每一位發言者的切入角度,也都有所受限。
所以,爭執,並不是一件壞事,只要每位參與者都能保持學習的態度,那麼即使在強烈的爭執之後,也能夠幫助到深廣的層面;反之,如果參與的人,並不是抱持學習的態度而來,那麼即使用再怎麼文雅婉轉的辭藻,心中已樹起了成見,背後的意義仍然是不歡而散。