For general exploringobjects requirement, narrow pulse signal with tens millimicro second to millimicrosecond has the frequency spectrum from DC to thousands MHz.
按目标探测的一般需要,通常采用纳
到十纳
量级的电磁探测窄脉冲,信号
谱具有从直
直到千兆赫兹的宽带。
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Our ears are most sensitive to sound, where most of the information in speech is contained, and that's between about 500 hertz and 2 kilohertz, which is somewhere between the middle and the upper three-quarters of a piano keyboard.
我们的耳朵对音最敏感的地方是大多数语音信息所在的地方,大约在 500 赫兹
2 千赫兹之间,这大约是在钢琴键盘的中间
上四分之三之间。
One thing to note is that if your clock is either fast or slow, it's most likely because the crystal oscillator doesn't oscillate exactly at 32.768 kilohertz due to the geometry and incorrect resonant frequency of tines.
需要注意的一点是, 如果您的时钟很快或很慢,很可能是因为晶体振荡器由于齿的几何形状和不正确的谐振频率而没有准确地以 32.768 千赫兹振荡。