Telephone modems - PowerPoint PPT Presentation

Chapter Twelve: Digital Modulation and Modems

Chapter Twelve: Digital Modulation and Modems. Introduction. Digital signals have become very important in wired and wireless communications To send data by radio, higher frequency carrier waves are necessary Amplitude, frequency, and phase are all used in digital communication systems.

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Electronic Marketing

Electronic Marketing. Chapter 5 An Introduction to the Internet. The Internet as a Whole. The Internet began as a federal government project and is still growing because of the support of the government More recently, the Internet has evolved to satisfy the demands of commercial interests.

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