n.外差作用

The heterodyning principle is well known in nonlinear optics as difference frequency generation (DFG). 在非線性光學(xué)領(lǐng)域,超外差原理就是著名的差頻產(chǎn)生(DFG)技術(shù)。

Using this CO2 laser, the experiment of three-frequency heterodyning is suooefully carried out. 利用該激光器,成功地進(jìn)行了三頻外差測(cè)量研究。

But by using a heterodyning architecture, the Harvard researchers demonstrated twin quantum cascade lasers, whose mixed output is in the terahertz gap. 然而,通過(guò)采用超外差架構(gòu),哈佛的研究人員證明,兩個(gè)量子級(jí)聯(lián)激光器的混合輸出可以覆蓋太赫茲頻段。

Again, due to the nature of heterodyning in the first detector,“holes” were left in the incoming radio spectrum when it mixed with the localoscillator. 再一次地，因?yàn)榈谝粰z波極里外差作用的特性所致，當(dāng)與本振信號(hào)混合時(shí)，在輸入頻率的范圍內(nèi)會(huì)出現(xiàn)死點(diǎn)，這導(dǎo)致有些電臺(tái)完全無(wú)法被受到。

The carrier signal injection method and the heterodyning algorithm for the extraction of high frequency current containing rotor space-position information are all discussed. 討論了載波信號(hào)的注入、提取以及包含轉(zhuǎn)子位置信息的高頻負(fù)序電流的外差處理技術(shù)。

(electronics) produced by heterodyning two oscillations. （電學(xué)）由兩股不同頻率的交替電流聯(lián)合產(chǎn)生。