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发表于 2006-5-4 10:49
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原帖由 wkz 于 2006-5-4 10:39 发表
看看我的先锋3500的技术指标:
频率响应:4-44000hz
信噪比:118db
总谐波失真:0.0016%
够高了吧。
总谐波失真是在1Khz正弦波下测试的,所以有非常高的指标,但是在接近采样频率时候失真大大增加,这个失真指标厂家没有给出,要靠实测试,如果在人耳无法听到的高频部分有靠近基频的谐波(如20khz 旁边有22khz的谐波,人耳的非线性还是可能会生物解调出22khz-20khz=2khz的音频
trevor 博士的实验结果如下:
Looking at the waveforms, there has definitely been a change to the input. But if, as is generally accepted, the human ear can only hear to 20 KHz, surely any changes above that frequency would not make any audible change to the output sound?
I don't believe this is true. I have personally set up two sinewaves at 19 KHz and 20 KHz into two different amplifiers and two separate tweeters. When the volume gets high enough, my ears become non-linear, and I can hear the 1-KHz difference frequency quite clearly.
所以不是说指标与听感完全不对应,而是看你测试指标的方法是否足够科学
[ 本帖最后由 leowood 于 2006-5-4 10:51 编辑 ] |
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