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原帖由 reg-neo 于 2016-12-2 15:59 发表 posted by wap, platform: iPhone 非CD源的凭啥转44.1？都糊了
原帖由 samusialan 于 2016-12-2 18:14 发表 其实说44.1khz是人耳上限的话 乐器高音上限不是5khz左右吗，怎么没人说11khz就够了？
原帖由 giant 于 2016-12-3 11:02 发表 posted by wap, platform: iPhone 为什么黑胶唱片销量据说现在还可以？
原帖由 samusialan 于 2016-12-3 12:22 发表 采样高于44.1khz没用的话，同理22khz当然够了啊 超过的乐器又没多少，就算有乐器超过了你听的曲子里又不一定用是吧？ 就算用了，也没多少人听得出是什么乐器对吧？ 就算听得出是什么乐器，你也说不出规格不是吗？ ...
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 a compact disc audio (44.1 kHz/16 bit) conversion of the same source material 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.[40] When the level of the signal was elevated by 14 dB or more, the test subjects were able to detect the higher noise floor of the CD quality loop easily.[1] The authors commented: 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.[1][41] Following criticism that the original published results of the study were not sufficiently detailed, the AES published a list of the audio equipment and recordings used during the tests.[42]
原帖由 pradafx 于 2016-12-3 18:31 发表 4k和2k离50米看的区别
