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Digital-to-analog conversion
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When receiving a digital signal such as pulse code modulation (PCM), a digital-to-analog (D/A) converter is used. This reverses the process of A/D conversion at the transmitter, so that the original analog data is recovered.
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510 Data reception You might ask, Why convert a signal to digital form in the first place, if it s going to be changed back to analog form at the receiver anyway The reason is that a digital signal is inherently simpler than an analog signal, in the sense that is less random. Thus, a digital signal resembles noise less than an analog signal. It s good to make a signal as different from noise as possible, in as many ways (or senses) as possible. This is because the more different a signal is from unwanted noise, the easier it is to separate the data from the noise, and the better is the realizable S/N ratio. You might think of signal/noise separation in terms of apples, oranges, and a watermelon. It takes awhile to find an orange in a tub of apples. (You ll probably have to dump the tub). Think of the orange as an analog signal and the apples as noise. But suppose there s a watermelon in a bushel basket with apples. You ll have no trouble at all finding the watermelon. Think of the melon as a digital signal and the apples as noise. Another, more interesting feature of digital communications arises when you think of a watermelon in a tub of oranges. It s as easy to separate a digital signal from a jumble of analog signals as it is to extract a digital signal from noise. In a band occupied by thousands of analog signals, a lone digital signal can be picked out easily far more easily than any of the analog signals. In recent years, digitization has become commonplace not only in data communications, but in music recording and even in video recording. The main advantage of digital recording is that a selection can be recorded, re-recorded, re-re-recorded, etc., and the quality does not diminish.
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A new and rapidly advancing communications technique, digital signal processing (DSP), promises to revolutionize voice, digital, and image communications. In analog modes, DSP works by converting the received voice or video signal input into digital data by means of an analog-to-digital (A/D) converter. The digital signal is processed and is reconverted back to the original voice or video via a D/A converter (Fig. 27-9).
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In digital modes, A/D and D/A conversion is not necessary, but DSP can still be used to clean up the signal. This reduces the number of errors. It is in the digital part of the DSP circuit that the signal enhancement takes place. Digital signals have a finite number of discrete, well-defined states. It is easier to process a signal of this kind than to process an analog signal, which has a theoretically infinite
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27-9 Digital signal processing.
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The principal of signal mixing 511 number of possible states. The DSP circuit gets rid of confusion between digital states. The result is an output that is essentially free from interference. Digital signal processors are available from several commercial sources. They can be installed in existing communications receivers. The benefits of DSP are improved signal-to-noise ratio, superior intelligibility, and enhanced fidelity or image clarity. In addition, DSP can make a CW, AM, or SSB receiver less susceptible to interference from atmospheric noise and ignition noise. This is because a digital signal is as different from noise as a watermelon is from an apple.
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The principle of signal mixing
A mixer is a circuit that combines two signals having different frequencies, producing a signal whose frequency is either the sum or the difference of the input frequencies. One of the signals is usually an unmodulated carrier, so that the mixer has the effect of converting a modulated signal at one frequency to a modulated signal at some other frequency. A mixer has two inputs and one output.
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