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HipHop for PHP (HPHPc) is a discontinued PHP transpiler created by Facebook. By using HPHPc as a source-to-source compiler , PHP code is translated into C++ , compiled into a binary and run as an executable , as opposed to the PHP's usual execution path of PHP code being transformed into opcodes and interpreted .
Background noise is an important concept in setting noise levels. Background noises include environmental noises such as water waves , traffic noise , alarms , extraneous speech , bioacoustic noise from animals, and electrical noise from devices such as refrigerators , air conditioning , power supplies , and motors .
Electric and hybrid vehicles could reduce noise pollution, but only if those vehicles make up a high proportion of total vehicles on the road; even if traffic in an urban area reached a makeup of fifty percent electric vehicles, the overall noise reduction achieved would only be a few decibels and would be barely noticeable. [12]
The L90 is the sound level that exceeds 90% of the time period; this is commonly referred to as background noise. [12] Researchers with the US National Park Service found that human activity doubles the background-noise levels in 63 percent of protected spaces like national parks, and increases them tenfold in 21 percent.
Environmental noise is an accumulation of noise pollution that occurs outside. This noise can be caused by transport, industrial, and recreational activities. [1] Noise is frequently described as 'unwanted sound'. Within this context, environmental noise is generally present in some form in all areas of human, animal, or environmental activity.
A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution. Noise barriers are the most effective method of mitigating roadway, railway, and industrial noise sources – other than cessation of ...
Worley noise, also called Voronoi noise and cellular noise, is a noise function introduced by Steven Worley in 1996. Worley noise is an extension of the Voronoi diagram that outputs a real value at a given coordinate that corresponds to the Distance of the nth nearest seed (usually n=1) and the seeds are distributed evenly through the region.
In filmmaking, ambience (also known as atmosphere, atmos, or background) consists of the sounds of a given location or space. [1] It is the opposite of "silence". Ambience is similar to presence , but is distinguished by the existence of explicit background noise in ambience recordings, as opposed to the perceived "silence" of presence recordings.