Active Speaker is also called Active Speaker. Usually refers to speakers with power amplifiers, such as multimedia computer speakers, active subwoofers, and some new home theater powered speakers. Active speaker Since the power amplifier circuit is built-in, the user does not have to consider the problem of matching with the amplifier, but also facilitates direct drive with a lower level audio signal.
In addition, there are professional recording monitor speakers with built-in amplifier circuits and electronic crossover speakers with built-in electronic crossover circuits and amplifiers that can also be classified as active speakers.
Passive Speaker (Passive Speake), also known as "passive speaker." The passive speaker is a common speaker that we usually use. It does not have an amplifier circuit inside. Passive speakers do not have amplifiers, but often have crossover networks and impedance compensation circuits.
Active speakers usually have parameters such as the output power of the built-in amplifier, input impedance, and input signal level. Active ultra-low speakers also specify the frequency characteristics of the input signal (such as full-band or low-frequency signals), low-pass filter characteristics and other parameters. Passive speakers are generally marked with impedance, power, frequency range and other parameters.
Hunting Trail Camera is a device that records images, either as a still photograph or a video. It is a rugged and weatherproof camera designed for extended and unmanned use outdoors. The images it produces are used for Wildlife Surveillance by hunters.
Most Trail cameras come with a strap that allows it to be hung from a tree and a lock to prevent theft. It will automatically take a picture when it senses motion. Each image is stamped with data which includes the date, time it was recorded, as well as a number of other data points. The hunting Trail Camera will usually function day and night by sensing out to around 100 feet.
The first hunting trail monitor used heat sensing motion detectors to trigger a counter to count the number and record the time of animals passing by. The sensors are also known as passive infrared light sensors or PIR sensors. Normally, hunters are never around so they do not know what kind or size animal was being counted. Later, a camera was added. Game Camera technology has evolved since then. Originally wildlife photography was only available by using film, but now there is a choice of film or digital cameras. The ability of Game Cameras to tell hunters where game is located is useful for pre-season scouting. The information when used in conjunction with Trail Camera software tells hunters where to best place their blind or tree-stand. For Digital Cameras, all images are recorded onto a memory card, such as a commonly available SD card. This also allows hunters to conveniently transfer the images to a home computer or they can be viewed, copied and deleted by a Viewer in the field. More expensive units have the ability to wirelessly upload captured images to a computer or website without any user interference.
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