本帖最后由 笨鸟先肥 于 2018-2-22 23:07 编辑
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俺说话不是象楼主这样随便撸出新理论。
俺读书少, 所以特别怕说错话。
爱华用什么芯片呢, 这些芯片的性能都是公开的, 不是俺可以随口更改的。
比如这个随身听 爱华JS-345随身听, 古老吧?
它用的是 NJM2073 Dual Low Voltage Power Amplifier。
DATASHEET 在这里
https://www.njr.com/semicon/products/NJM2073.html
大家自己可以随时查看。
俺有随口瞎编吗? 目前还没有吧。
这几段是英文的, 查字典吧。
it has now been demonstrated that the human ear cannot perceive distortion levels of less than 6–12% on "normally complex music." If you think you can hear 0.1%, you are deluding yourself.
That, believe it or not, is the gist of an article by Robert Carver of Phase Linear Corp., in the May 1973 issue of Stereo Review.
Read more at https://www.stereophile.com/asweseeit/673awsi/index.html#W2rhpQKopvbDwiRK.99
Since audio amplifiers amplify signals for humans to hear, the psychoacoustics of human hearing should be considered. There is no point in designing a system that drops THD well below the threshold of human hearing. Humans typically cannot detect THD less than 1%, but a single THD measurement doesn’t tell the whole story.
Our sensitivity is frequency dependent, and we are also more sensitive to higher-order distortions. With training and with certain types of distortion, some distortion effects as low as 0.3% can be heard.1 When designing an audio amplifier, if cost is no object, it would make sense to design a system with THD below the threshold of human hearing across all frequency ranges.
https://www.allaboutcircuits.com/technical-articles/total-harmonic-distortion-audio-systems-harmonics-subjectivist-rationalist/
这两篇不够, 还有 B&K 的
https://www.bksv.com/media/doc/BO0385.pdf
J. Moir, "Just Detectable Distortion", Wireless World, vol. 87, no. 1541, Feb. 1981.
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欢迎撕逼, 欢迎来搞:
https://zhuanlan.zhihu.com/p/33880583
https://zhuanlan.zhihu.com/p/33835484
https://zhuanlan.zhihu.com/p/32320392
https://zhuanlan.zhihu.com/p/33807183
https://zhuanlan.zhihu.com/p/33835456
https://zhuanlan.zhihu.com/p/33783884
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