Impressed Frequency(外加频率), 此释义来源于网络辞典。
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A form of frequency modulation in which the carrier frequency is shifted between a mark frequency and a space frequency in response to the impressed intelligence signal (frequency-shift keying).
频率调制的一种方式,其中载波频率在标志频率和场频率之间移动,以响应外加的情报(数据)信号。
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