electronics

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Title: electronics

Essay Details:

Subject: Technology

Author: Alma M

Date: May 16, 2015

Level: University

Grade: B

Length: 13 / 3733

Essay text:

There are two basic types of electrical signals: analog and digital. In analog signals, some continuously variable aspect of the electrical current represents the information. In amplitude modulated (AM) radio transmissions, for example, the amplitude, or strength, of the electromagnetic radio wave is proportional to the amplitude of the signal--the volume of the sound that the radio wave carries. The greater the amplitude of the radio wave, the louder the sound that radiates from the radio speaker. In contrast, digital signals use standardized pulses to represent numbers. With a digital audio signal, the amplitude of the signal for a set amount of time is converted to a number represented by, for example, 16 pulses of fixed duration and amplitude...

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