As we all know, communication plays an extremely important role in human society, along with social development, mutual exchange of message types, more and more increasing volume and speed have become increasingly demanding. Thus the requirements for communications have become more sophisticated, modulation in communication systems are a very important role.
Through the modulation spectrum can be removed not only the modulation signal spectrum move to the desired position, which will convert the modulated signal suitable for transmission of signals have been transferred, and the effectiveness of its transmission system and transmission reliability of a a great impact, often determines the modulation of a communication system performance.
This paper introduces the concept of modulation, the role and classification. Analysis of the working principle of modulation, the modulation system analysis module, which focuses on issues related with the DSB-SC modulation of the Design and Implementation of modules.Key words: modulation, Demodulation, DSB-SC modulation
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