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Follow on Google News | Electronixwarehouse.com Adds Vital Information about Excess Noise to its Car Stereo GlossaryAn update on changes and additions to the Electronixwarehouse Glossary of Technical Terminology
By: D. Harbaugh “NOISE Perceived sounds not in the original soundtrack. Such things as hiss, crackle, pops, hum, and buzz, are typical of the types of extraneous signals described as noise. Inherent noise in the electronic processing in any system is measured in decibels relative to the amplitude of the original signal. Sounds perceived as noise are heard in contrast to the sound that is the object of attention. Thus, a noise signal measured at 15 decibels below the output of Tchaikovski's 1812 Overture finale would probably not even be heard; while a slight hiss at 55 dB below the level of a soft piano passage would be annoyingly obvious. Generally, any piece of equipment which generates ambient noise of more than 90 dB below the level of a typical audio signal is noise free as far as most human perception is concerned. (also see Getting Rid Of Noise) “NOISE FLOOR Normally the lowest threshold of useful signal level (although sometimes audible signals below the noise floor may be recovered). “NOISE GATE An expander with a fixed "infinite" downward expansion ratio. Used extensively for controlling unwanted noise, such as preventing "open" microphones and "hot" instrument pick-ups from introducing extraneous sounds into the system. When the incoming audio signal drops below the user set-point (the threshold point) the expander prevents any further output by reducing the gain to "zero." The actual gain reduction is typically on the order of -80 dB, thus once audio falls below the threshold, effectively the output level becomes the residual noise of the gate. Common terminology refers to the gate "opening" and "closing." Another popular application uses noise gates to enhance musical instrument sounds, especially percussion instruments. Judicious setting of a noise gate's attack (turn-on) and release (turn-off) times adds "punch," or "tightens" the percussive sound, making it more pronounced.” In its Technical Advice and Assistance section, technical editors explain how to deal with excess noise, enumerating subjects like The Genesis of Noise, How Alternator Noise Becomes Audible, Noise Filters, and Troubleshooting Tips. Updating of these popular consumer advice and education sections is ongoing, and additional status reports will be forthcoming. The Glossary can be found at http://www.electronixwarehouse.com/ Established in 1999, Electronixwarehouse.com (http://www.electronixwarehouse.com/ End
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