人耳最多能听到20khz的声音,为什么录音时的采样率要用44.1khz?录音的时候直接用20khz不得了?顺带一问啊,还有一些耳机频响范围都大于20khz,那是超声波了啊,人耳又听不到,岂不是没用吗?
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