... two-frequency signal receiver 双频制信号接收机 two-frequency signal 双频信号 two-funneled 双烟囱的 ...
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For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.
对于无线数字通信而言,通常将数字用户信号首先转换到模拟域中,然后通过一个或两个步骤将其调制到无线电频率。
Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
相乘器是由非线性元件组成,可以实现两个信号的相乘,完成频率变换的电路。
Combining two methods, it is detected and analyzed that the weak signal slowly frequency change accompanied by noise.
结合所提出的两种方法,对带噪声的频变微弱振动信号进行了检测分析。
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