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注册时间 2012-9-15
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引用第206楼鸡蛋灌饼于2012-12-02 01:46发表的 :
这贴怎么战了这么久……
好吧我来给致命一击
认为人类对20kHz上声音没感觉,所以不需要保留这些数据的人速速补修听觉心理学去
The World Beyond 20kHz 
妈呀,致命一击。。。
还让人补习听觉心理学,您怎么把听觉心理学里最最最最最最重要的命题之一ABX盲听测试给扔了,几乎所有当代有损压缩都是以ABX为基础的。
还有,成年人听不到16KHZ以上的可是实实在在写在听觉心理学里的。
http://en.wikipedia.org/wiki/PsychoacousticsLimits of perception
The human ear can nominally hear sounds in the range 20 Hz (0.02 kHz) to 20,000 Hz (20 kHz). The upper limit tends to decrease with age; most adults are unable to hear above 16 kHz. The lowest frequency that has been identified as a musical tone is 12 Hz under ideal laboratory conditions.[5] Tones between 4 and 16 Hz can be perceived via the body's sense of touch.
总有人让人补习这补习那,说这话之前自己搞清楚好不好
没有ABX盲听基础的理论都是真玄学。
你找的那篇本质是BLOG,这种BLOG要多少有多少。
为什么SACD理论是和商业上都破产了?
理论基础是人类听不到20KHZ以上的,
实验验证了盲听普通人区分不出来高采样
如果你的意思是超声波有没有可能起到扰乱人心智的作用,当然有。但这对音乐本身毫无意义。
超声波会不会影响20khz以下听感,可能会,但是盲听实验无法证明。
有没有人天赋异禀能听到超声波,地球上好几十亿人,不排除这个可能,但我认为自己没这能力。
坚持认为声音回放应该在18KHZ切干净的专业人士也大有人在,真这么去做的回放器材也有的是。
我又回这贴了我真SB
http://en.wikipedia.org/wiki/Super_Audio_CDIn the audiophile community, the sound from the SACD format is thought to be significantly better than older Red Book CD-DA format CD recordings.[sup][41][/sup] However, in September 2007 the Audio Engineering Society published the results of a year-long trial in which a range of subjects including professional recording engineers were asked to discern the difference between SACD and compact disc audio (44.1 kHz/16 bit) under double blind test conditions. Out of 554 trials, there were 276 correct answers, a 49.8% success rate corresponding almost exactly to the 50% that would have been expected by chance guessing alone.[sup][42][/sup] The authors commented:
[blockquote]Now, it is very difficult to use negative results to prove the inaudibility of any given phenomenon or process. There is always the remote possibility that a different system or more finely attuned pair of ears would reveal a difference. But we have gathered enough data, using sufficiently varied and capable systems and listeners, to state that the burden of proof has now shifted. Further claims that careful 16/44.1 encoding audibly degrades high resolution signals must be supported by properly controlled double-blind tests.[sup][1][/sup][sup][43][/sup]
[/blockquote]This conclusion is contentious among the audiophile community.[sup][44][/sup] Some have questioned the basic methodology and the equipment used in the AES study.[sup][45][/sup]
Double-blind listening tests in 2004 between DSD and 24-bit, 176.4 kHz PCM recordings reported that among test subjects no significant differences could be heard.[sup][46][/sup] DSD advocates and equipment manufacturers continue to assert an improvement in sound quality above PCM 24-bit 176.4 kHz.[sup][47][/sup] Despite both formats' extended frequency responses, it has been shown people cannot distinguish audio with information above 21 kHz from audio without such high-frequency content.[sup][48] [/sup] |
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