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外差转换[Heterodyne Conversion] [2005-10-22]
iamet 发表在 Ω〖物理〗
| | Use of a local oscillator to mix a radio frequency signal to a more convenient intermediate frequency. The mixer generates upper and lower sidebands, either of which may be filtered out if desired. |
学好数理化，走遍天下都不怕！ | |
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