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The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...
PIR sensors identify abrupt changes in temperature at a given point. As an intruder walks in front of the sensor, the temperature at that point will rise from room temperature to body temperature and then back again. This quick change triggers the detection. PIR sensors designed to be wall- or ceiling-mounted come in various fields of view ...
Smartphone optical proximity sensor without the phone's casing. The sensor itself is the black object on top of the yellow block below it; this block is actually a printed circuit board serving as an interposer. A proximity sensor (often simply prox) is a sensor able to detect the presence of nearby objects without any physical contact.
A hot shower might help return the head to its original shape, but taking breaks from wearing headphones is the most effective way to avoid causing a dent in the scalp. @curtoss
A glass break detector is a sensor that detects if a pane of glass has been shattered or broken. [1] These sensors are commonly used near glass doors or glass storefront windows. They are widely used in electronic burglar-alarm systems. The detection process begins with a microphone that picks up noises and vibrations coming from the glass.
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...
The term may also be used to describe a video artifact common in older video cameras. Before the introduction of solid-state charge-coupled device (CCD) sensors to produce the image, vacuum tubes performed this task. Loud noises in the studio, such as rock bands or gunshot effects would cause the tubes to vibrate, producing a characteristic ...
This includes headwear that places pressure on the head — including tight hats, helmets, headbands, wigs and other artificial hair accessories, headphones and goggles. It is not known why some people are more sensitive than others to this type of pressure. External compression headaches can affect anyone who uses headwear.