barcode printing using vb.net Acoustics, audio, and high fidelity Output Input wave in Software

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31-2 A linear circuit produces no distortion of the input waveform.
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31-3 A nonlinear circuit distorts the input waveform.
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distortion meters, excessive input will cause the needles to kick into the red range of the scale during peaks. If the input is driven up still more, the needle will stay in the red range much of the time. Some people might say it s cool to run a hi-fi amplifier this way. If lousy sound is what you want, maybe that is true. But generally it s stupid, and in some cases can damage system components.
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Dynamic range is a prime consideration in hi-fi recording and reproduction. In general, the greater the dynamic range, the better the sound quality over a wide range of volume levels. Dynamic range is expressed in decibels (dB). The larger the dynamic-range specification in dB, the better the system, all other factors being constant. At low volume levels, the limiting factor in dynamic range is the background noise in the system. In a traditional analog system, most of this noise comes from the audio
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Basic components 589 amplification stages. In tape recording, there is also some tape hiss. A scheme called Dolby (a trademark of Dolby Laboratories) is used in professional recording studios, and also in high-end consumer tape equipment, to minimize this hiss. Digital recording techniques, such as is used in compact disk (CD) or digital audio tape (DAT) recording, have less internal noise than older analog systems. At high volume levels, the power-handling capability of an audio amplifier limits the dynamic range. If all other factors are equal, a 100-watt system will have greater dynamic range than a 50-watt system. The speaker size is also important; the larger the speakers, the greater the dynamic range. This is why serious audio enthusiasts sometimes purchase sound systems with amplifiers and speakers that seem unnecessarily large. The reason for such overengineering is usually twofold: (1) to ensure that the sound peaks will always be distortion-free and cannot possibly damage the speakers and (2) to impress people.
Basic Components
There are myriad ways to set up a hi-fi system. Almost every true audiophile (literally, sound lover ) builds a system over a period of time, component by component. Some people own two or three stereo systems. Here are some basic considerations.
Configuration
The simplest home stereo system is contained in a single box, with an AM/FM radio receiver, a tape player, and a CD player. The speakers are generally external. The assets of a so-called compact hi-fi system are small size and low cost. More sophisticated hi-fi systems have separate boxes for the radio receiver, the tape player, the CD player, and, in some cases, a turntable, a computer, or other nonstandard peripheral. The units in such a component hi-fi system are interconnected with shielded cables. This allows you to choose each unit to suit your own taste and needs. A typical component system costs several times as much as a compact system, but the sound quality is better, and you can have high-power audio. Some hi-fi manufacturers build all their equipment cabinets to a standard width so they can be mounted one above the other in a rack. A rack hi-fi system has an appearance reminiscent of military hardware. This scheme saves floor space and makes the system look professional. The rack can be mounted on wheels so the whole system (except for the external speakers) can be rolled from place to place. Figure 31-4 is a block diagram of a typical home stereo hi-fi system. The amplifier chassis should be grounded to minimize hum and noise and to reduce the system s susceptibility to electromagnetic interference (EMI). The AM antenna is typically a loopstick built into the cabinet or mounted on the rear panel. The FM antenna can be an indoor type, such as television rabbit ears, or a sophisticated outdoor antenna. If an outdoor antenna is used, lightning safety precautions must be observed.
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