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Old 22nd April 2013, 02:26 PM   #4141
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You don t have to do the sound card thing kiven.
Your rigol scope can do FFT, with the math function
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Old 22nd April 2013, 02:55 PM   #4142
generg is offline generg  Germany
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Quote:
Originally Posted by kiven chen View Post
Read an article today, seem to say.
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Hi Kiven Chen I am not allowed to enter these area in the Chinese forum.

Would be nice if you could do like dimkasta says......
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Old 23rd April 2013, 03:27 AM   #4143
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Quote:
Originally Posted by generg View Post
Hi Kiven Chen I am not allowed to enter these area in the Chinese forum.

Would be nice if you could do like dimkasta says......
You can try this address.
QQ??
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Old 23rd April 2013, 03:35 AM   #4144
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Comes to most tube amplifier will say their sense of even harmonic-rich fruity permeability adjectives
Comes to transistor amplifier has an odd harmonic distortion loud digital sound
Are divided into even and odd distortion of power amplifier distortion according to this comment is too general (is wrong) above is completely wrong
Today I have to correct everyone think even harmonics is even listening to mellow and odd harmonics is harsh is Concord 2 part 3 secondary harmonics part 2 should argue that odd sense of hearing is not good 3 should be deafening Concord
So I'm a tough---in fact, this is wrong! Both distortion is also not a poor sense of hearing and do not have a good sense of hearing can say 3 times and 2 times the same ear can not hear the difference
This is why? No credentials are affixed with a photo caption says harmonic distortion of power amplifier amplifier 2 harmonic Max -60dB (here not talking about total harmonic distortion is too general) or 0.1% already low distortion it simply in order to look more obvious bottom 10% distortion simulation I use to demonstrate
Green lines are fundamental secondary distortion components of Red 10% blue as a synthesis of waveforms

Click the image to open in full size.
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Old 23rd April 2013, 03:37 AM   #4145
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Figure can be seen on -20dB a huge blue wave distortion
Just somewhat inclined and do not see there is a new wave form generation
Fact the wave ear cannot distinguish between it and the fundamental differences in the green line single-ended amplifier is prone to this kind of distortion


See third harmonic distortion

http://bbs.hifidiy.net/data/attachme...g4r7054rrg.png
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Old 23rd April 2013, 03:44 AM   #4146
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Click the image to open in full size.

This huge distortion of the top and just makes the blue waveform peak becomes more round and no new waveform generation
The third harmonic distortion ear cannot distinguish the difference between it and the green of the original waveform before Xiao Buo easy output of any amplifier that


See below 4 harmonic distortion waveform

Click the image to open in full size.

4 harmonic distortion and the top 2 times 3 times have significantly different waveforms can be seen now, twist-7 8, this is obviously a new waveform generation
Obviously listening ear for this waveform has a (separate) the fundamental ingredient is not outside of Concord had a b class-AB amplifier sound prone to distortion

See 5 waveforms

Click the image to open in full size.

And the top four times as new wave is not explained
Class-AB amplifiers (note there's no b class) were most prone to distortion of the

6 waveforms

Click the image to open in full size.

Ditto b class-AB prone
"Classmates" to ask like this didn't mention push-pull class a amplifiers may give rise to distortion of what the answer is: not here say that any distortion of the waveform is the infinite green fundamental to enlarge (precious)
Higher harmonics and 4 new waveforms appear 6 times as this is seriously affecting sense of hearing

Speaking of which, I think low harmonic distortion power amplifier harmonic distortion should be divided into 2 and 3 (does not affect the sense of hearing) and more than 4 times higher harmonic distortion and are not capped, will obviously affect the sense of hearing!
Even and odd harmonic distortion of power amplifier (here only on the harmonic distortion of power amplifier harmonic distortion sounds, and this is a difference does not talk about here) talk about its impact on the sense of hearing is clearly wrong!


Come to the conclusion that so-called even-order harmonic distortion of the amplifier (in fact, only 2 and 3----has been rarely go there because it is a class A amplification) is not the sense of mellow listening source actually has no effect on the sense of hearing is basically only there 4 times and higher harmonic presence reflects round (no high-frequency noise)
I mentioned this thread and this point is unity
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Old 23rd April 2013, 03:46 AM   #4147
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It is posted at 提示信息 - HIFIDIY论坛 - Powered by Discuz!
Use online machine translation
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Old 23rd April 2013, 09:20 AM   #4148
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Putting "Fruity Permeability" aside for one sec....
Some day this world will be a much smaller place - when machine translation worked on the fly and worked well. We spent so much on the human genome project, how about the powers fund the development of decent translation 'source-dictionaries' ...Imagine the contribution to sciences, the humanities, to travelling, chatting up birds ... to diy audio ...

Until then though, anyone who knows mandarin can help read the article and improve the translation above ? It looks intriguing ! Thanks kiven ....
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Old 23rd April 2013, 10:01 AM   #4149
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Every day I say is Mandarin, but this article does not help, because my English is so poor.
If you are interested in this, I try translation using a dictionary of single words. When I have time.
But there is little hope that, even if a single word translation estimate is also very difficult to understand.
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Old 23rd April 2013, 10:12 AM   #4150
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