摘 要：調(diào)制是將要傳送的信息裝載到某一高頻 (載波)信號上去的過程。振幅調(diào)制是用調(diào)制信號去控制載波的幅度，使其隨調(diào)制信號線性變化，而保持載波的頻率不變。在幅度調(diào)制中，根據(jù)已調(diào)信號的頻譜分量不同，分為普通調(diào)幅(標(biāo)準(zhǔn)調(diào)幅AM)、抑制載波的雙邊帶調(diào)幅(DSB)、抑制載波的單邊帶調(diào)幅(SSB)。它們的主要區(qū)別是產(chǎn)生的方法和頻譜結(jié)構(gòu)不同。

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關(guān)鍵詞：載波；調(diào)制；調(diào)幅;頻譜

Research on Amplitude Modulation

ZHANG Wei，DONG Yunfeng，XIA Yunbo

(Daqing Teachers College，Daqing，163712，China)

Abstract：Modulation is the transmission of information to be loaded onto a high-frequency (carrier) signal in the process.Amplitude modulation using signal to control the rate of carrier，with its linear modulation signal changes，and maintain the same carrier frequency.In the amplitude modulation，in accordance with the strength of signals in the spectrum of different components，it is divided into ordinary AM (amplitude modulation standard AM)，with inhibition of bilateral carrier AM (DSB)，the carrier single sideband suppression AM (SSB).The main difference is the different methods and structure of the spectrum.

Keywords：carrier;modulation;AM;frequency spectrum

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把要傳送的信號裝載到某一高頻振蕩(載頻)信號上去的過程叫做調(diào)制，當(dāng)載波為正弦波信號時，為連續(xù)調(diào)制。連續(xù)波調(diào)制以單頻正弦波為載波，受控參數(shù)可以是載波的幅度um，頻率ω或相位φ。因而出現(xiàn)了調(diào)幅(AM)、調(diào)頻(FM)和調(diào)相(PM)三種調(diào)制方式。

振幅調(diào)制是用調(diào)制信號去控制載波的振幅，使其隨調(diào)制信號線性變化，而保持載波的頻率不變。在幅度調(diào)制中，根據(jù)所取出已調(diào)信號的頻譜分量不同，分為普通調(diào)幅(AM)、抑制載波的雙邊帶調(diào)幅(DSB)、抑制載波的單邊帶調(diào)幅(SSB)。