一篇關於DSP技術取代真空管的學術文章 （ZT)，兼評 《真空管為什麽好聽， 是音樂愛好者的最愛 -imagefly2008-

 

 

在音頻放大器應用領域，DSP （數字信號處理）技術日臻完善， 已經可以 完全取代真空管電路。 內容詳見下麵鏈接：
 

 

http://www.mitpressjournals.org/doi/pdf/10.1162/comj.2009.33.2.85


附一個博士論文：


http://cegt201.bradley.edu/projects/proj2003/dtubeamp/

DSP Implementation of a 1961 Fender Champ® Amplifier

By: James Siegle

Advisor: Dr. Thomas L. Stewart
 

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Abstract

Solid-state technology may dominate the present electronics world, but vacuum tubes continue to hold influence in the guitar amplifier industry. The sound of a guitar playing through a vintage vacuum tube amplifier has become a standard for most guitarists. Unlike solid-state guitar amplifiers, vacuum tube amplifiers produce specific, disorted guitar sounds. The quality and amount of harmonic distortion in overdriven vacuum tube guitar amplifiers has been found to be pleasing to several musicians. This desirable effect has been termed "tube distortion." Even though vacuum tube designs for guitar amplifiers are characterized by their superior sound, their disadvantages include high cost, fragility, limited availability of components, high waste heat generation, and manufacturing inconsistencies in the tubes. The objective of this project is to reproduce the distinct harmonic distortion of a 1961 Fender Champ with a low-cost DSP and thus implement a guitar amplifier with tube distortion without the bulky and awkward features of a tube amplifier. Once the DSP-based design is completed for this small amplifier, the algorithm can be reconfigured for other vintage vacuum tube amplifiers.

所有跟帖： 

• 除非人腦直接理解010110，模擬還是比數字高，隻是高得越來越不清楚 -wooddiy- ♂ (0 bytes) () 06/07/2014 postreply 17:55:55

• 很哲學。屋頂雜文《 真空管為什麽好聽， 是音樂愛好者的最愛》把"GUITAR AMPLIFIER" -tianfangye- ♂ (44 bytes) () 06/07/2014 postreply 19:23:05

• 這基本是瞎扯蛋 數字的東西不好聽和模數轉換時的aliasing導致的瞬態響應不平滑有關 -大大V- ♂ (0 bytes) () 06/09/2014 postreply 11:46:39

• 如果用DSP解決，運算量太大 -大大V- ♂ (0 bytes) () 06/09/2014 postreply 11:47:39

• 文科生吧？ 知道柯達為什麽BK嗎？ -tianfangye- ♂ (0 bytes) () 06/09/2014 postreply 17:55:40

• 你知道奈奎斯特定律？零點，極點？瞬態響應的群相位延時特性？草垛曲線？ -大大V- ♂ (0 bytes) () 06/10/2014 postreply 09:32:27

• 象個物理教授，老大似乎在穿越吧？DSP技術2000年左右就成熟並形成工業規模， -tianfangye- ♂ (37 bytes) () 06/10/2014 postreply 16:48:54

• 你沒明白我說的是什麽，頻域裏“磚牆”濾波器和“草垛”型濾波器。。。 -大大V- ♂ (1186 bytes) () 06/11/2014 postreply 06:13:31

• 關於音頻信號濾波，采樣題目，您說的都是在數字電路裏才能實現的， 與真空管不搭界或做起來很困難 -tianfangye- ♂ (0 bytes) () 06/12/2014 postreply 16:09:00

• Nyquist frequency... -slow_quick- ♂ (69 bytes) () 06/12/2014 postreply 13:21:14

• 是Nyquist sampling criterion -slow_quick- ♂ (0 bytes) () 06/12/2014 postreply 13:36:28

• 在應用上這不就正是固體電路DSP技術嗎？那裏有真空管的影子？ -tianfangye- ♂ (2793 bytes) () 06/12/2014 postreply 16:25:06

• 這個就是analog與digital的區別 -slow_quick- ♂ (76 bytes) () 06/12/2014 postreply 17:48:28

• 所以除了低頻音頻放大，真空管無用。反之，數字信號處理離不開固體電路 -tianfangye- ♂ (0 bytes) () 06/12/2014 postreply 18:13:01

• 對，電子管其實是濾除了部分高頻的，是失真的。 -企鵝肥肥- ♂ (0 bytes) () 06/13/2014 postreply 13:23:08

• 竟敢侮辱我們老T！ -slow_quick- ♂ (0 bytes) () 06/11/2014 postreply 20:48:24

• 不明白您的意思。 沒見TA說DSP取代tube是。。。。？ 在高頻音頻處理上， tube曲線相應很差 -tianfangye- ♂ (67 bytes) () 06/12/2014 postreply 15:53:26

• 我們老T一點文也不懂的 -slow_quick- ♂ (0 bytes) () 06/12/2014 postreply 17:39:18

• 他應該知道“應用範圍”吧？ 怎麽也不能把數字處理問題和tube連在一起吧？ -tianfangye- ♂ (0 bytes) () 06/12/2014 postreply 18:15:16

• 爭來爭取，好像還是沒人否認真空管好聽 -ken222- ♂ (0 bytes) () 06/09/2014 postreply 17:57:18

• true：“電吉他”；false：其他音頻放大領域 -tianfangye- ♂ (0 bytes) () 06/09/2014 postreply 18:34:49

• 有幾個聽過真空管的？裝過的？比較過Si/Ge/Williams產品的？ -chinomango- ♂ (46 bytes) () 06/17/2014 postreply 13:45:53

• 也是。不光說tubes 10幾年就會漏氣質變-15%， 金屬打擊樂，爆炸聲等tube都會壓沒了變味了， -tianfangye- ♂ (63 bytes) () 06/17/2014 postreply 15:12:39