progress bar code in vb.net 2008 Figure 1-13 Creating a sine wave in Software

Drawer Code 3/9 in Software Figure 1-13 Creating a sine wave

Figure 1-13 Creating a sine wave
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Figure 1-14 Sine wave
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Figure 1-15 Amplitude modulation
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dashed line represents a high-amplitude signal, while the solid line represents a lower amplitude signal. So, how could this be used in the data communications realm Simple: Let s let a high-amplitude signal represent a digital zero and a low-amplitude signal represent a digital one. If I then send four high-amplitude waves followed by four low-amplitude waves, I have actually transmitted the series 00001111. This technique is called amplitude modulation (AM); modulation simply means variation. This is how AM radio works and why it s called AM. Frequency Modulation Frequency modulation (FM) is similar to amplitude modulation except that instead of changing the loudness of
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1
the signal, we change the number of signals that pass a point in a given second (see Figure 1-16). The left side of the graph contains a lower frequency signal component, while a higher frequency component appears to its right. We can use this technique in the same way we used AM: If we let a high-frequency component represent a zero and a lowfrequency component represent a one, then I can transmit our 00001111 series by transmitting four high-frequency signals followed by four lowfrequency signals. An interesting historical point about FM: The technique was invented by radio pioneer Edwin Armstrong in 1933. Armstrong created FM as a way to overcome the problem of noisy radio transmission. Prior to FM s arrival, AM was the only technique available and it relied on modulation of the loudness of the signal and the inherent noise to make it stronger. FM did not rely on amplitude, but rather on frequency modulation; therefore, it was much cleaner and offered significantly higher fidelity than AM radio. Keep in mind that signals pick up noise over distance; when an amplifier amplifies a signal, it also amplifies the noise. Many technical historians of World War II believe that Armstrong s invention of FM transmission played a pivotal role in the outcome of the war. When WWII was in full swing, FM technology was only available to Allied forces. AM radio, the basis for most military communications at the time, could be jammed by simply transmitting a more powerful signal that overloaded the transmissions of military radios. FM, however, was not available to the Axis powers and, therefore, could not be jammed as easily. Phase Modulation Phase modulation (PM) is a little more difficult to understand than the other two modulation techniques. Phase is defined
Figure 1-16 Frequency modulation
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mathematically as the fraction of a complete cycle elapsed as measured from a particular reference point. Any questions OK, Now let s make that definition make sense. Consider the drawing shown in Figure 1-17. The two waves shown in the diagram are exactly 90 degrees out of phase of each other, because they do not share a common start point wave B begins 90 degrees later than wave A. In the same way that we used amplitude and frequency to represent zeroes and ones, we can manipulate the phase of the wave to represent digital data. A few years ago I saw a very graphic (and way too cool) example of how phase modulation can be used in a practical way. I was in Arizona with a film crew, shooting a video for one of my corporate clients. The theme of the video was based on the statement that if we don t intelligently deploy technology, the competition will leave us in the dust. Building on that phrase about dust, we rented a ghost town in Arizona and created a video metaphor around it. In the last scene of the video, a horse-drawn wagon loaded with boxes of technology products disappears into a bloody Arizona sunset, and just before the wagon disappears over the hill, it blasts into the sky on a digital effect that looks like a rocket trail. We loved it. The only problem was that when we got back into the postproduction studio and began to assemble the final show, we discovered to our horror that the sound of an airplane could be heard
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