progress bar code in vb.net Figure 1-17 Phase modulation in Software

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Figure 1-17 Phase modulation
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behind our narrator. Since airplanes didn t exist in the old west, we had a big problem. Not to be bested, our audio engineer asked us to pipe the sound into the audio booth. Listening to the recording, he went to his wall of audio CDs and selected a collection of airplane sounds. He listened to several of them until he found one that was correct. Setting the levels so that they matched those of the video soundtrack, he inverted the CD signal (180 degrees out of phase with the soundtrack signal) and electronically added it to the soundtrack. The airplane noise disappeared from the narration.
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Digital Signaling
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Data can be transmitted in a digital fashion as well. Instead of a smoothly undulating wave crashing on the computer beach, we can use an approximation of the wave to represent the data. This technique is called digital signaling. In digital signaling, an interesting mathematical phenomenon called the Fourier Series is called into play to create what most people call a square wave, shown in Figure 1-18. In the case of digital signaling, the Fourier Series is used to approximate the square nature of the waveform. The details of how the series actually works are beyond the scope of this book, but suffice it to say that, by mathematically combining the infinite series of odd harmonics of a fundamental wave, the ultimate result is a squared-off shape that approximates the square wave that commonly depicts digital data transmission. This technique is called digital signaling, as opposed to the amplitude-, frequency-, and phase-dependent signaling techniques used in analog systems. In digital signaling, zeroes and ones are represented as either the absence or presence of voltage on the line and, in some cases, by either positive or negative voltage or both. Figure 1-19, for example, shows a
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Figure 1-18 Square wave
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First Things First
technique in which a zero is represented by the presence of positive voltage, while a one is represented as zero voltage. This is called a unipolar signaling scheme. Figure 1-20 shows a different technique, in which a zero is represented as positive voltage, while a one is represented as negative voltage. This is called a nonreturn to zero (NRZI) signaling scheme, because zero voltage has no meaning in this technique. Finally, Figure 1-21 demonstrates a bipolar signaling system. In this technique, the presence of voltage represents a one, but notice that every other one is opposite in polarity from the one that precedes it and the one that follows it. Zeroes, meanwhile, are represented as zero voltage. This technique, called alternate mark inversion (AMI), is commonly used in T- and ECarrier systems for reasons that will be discussed later. There are other techniques in use, but these are the most common.
Figure 1-19 Unipolar signaling scheme
1 1 1
Figure 1-20 NRZI signaling scheme
Figure 1-21 Bipolar signaling scheme
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First Things First
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Clearly, both analog and digital signaling schemes can be used to represent digital data depending upon the nature of the underlying transmission system. It is important to keep the difference between data and signaling clearly separate. Data is the information that is being transported, and it can be either analog or digital in nature. For example, music is a purely analog signal because its values constantly vary over time. It can be represented, however, through both analog and digital signaling techniques. The zeroes and ones that spew forth from a computer are clearly digital information, but they, too, can be represented either analogically or digitally. For example, the broadband access technology known as DSL is not digital at all: There are analog modems at each end of the line, which means that analog signaling techniques are used to represent the digital data that is being transmitted over the local loop.
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