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    Spy Hearing Parabola adalah Alat Penyadap suara / mendengarkan suara pembicaraan jarak jauh (sampai dengan 100 meter), dan juga dapat merekamnya dan dapat diputar kembali untuk mendengarkannya. Memory internal hanya dapat merekam selama 12 detik saja, akan tetapi terdapat 123out audio yang memungkinkan untuk disambungkan ke alat perekam suara ...

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    Spy Hearing Parabola ( Alat Sadap Suara Jarak Jauh) Spy Hearing Parabola adalah Alat Penyadap suara / mendengarkan suara pembicaraan jarak jauh (sampai dengan 90 meter), dan juga dapat merekamnya dan dapat diputar kembali untuk mendengarkannya.

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  • How to Build a Parabolic Microphone Dish - Videomaker

    A parabola is a specific geometric curve that has a distinct mathematical property. When a straight line hits any point on the inner surface of a parabolic curve it reflects off the slope to a single common point centered in front of the curve. This position is the focal point of the parabola.

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  • How a Parabolic Microphone Works Sciencing

    2017-4-24  A parabola is a geometric curve with a fascinating property: when a line (Q) hits the inner surface at any point (P), the slope at that point will reflect the line into a single location, the "focus" of the parabola (F). Therefore, if an infinite number of parallel lines hit the parabola straight on, every ...

  • Eavesdrop from a Distance with This DIY Parabolic

    Image via sourcedns. A parabolic microphone uses a parabolic reflector to focus sound waves onto a receiver. This makes it a lot more sensitive than a normal microphone (think of it like a satellite dish for audio). They're used for everything from sports broadcasting to nature recording, to more nefarious purposes like eavesdropping and law enforcement.

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  • Parabolic Microphones - The amplification of sound

    2011-10-31  Parabolas only focus waves with a wavelength much smaller than the diameter of the parabola. Since sound waves travel at 342 m/s (meters per second - the speed of sound) through the air, obtaining hi-fidelity sound (down to 20 Hz, the lower limit of human hearing) would require a parabola with a diameter greater than 17 meters (= 342 m/s / 20 Hz).

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    2019-9-15  Parabolas only focus waves with a wavelength much smaller than the diameter of the parabola. Since sound waves travel at 342 m/s through the air (speed of sound), obtaining hi-fidelity sound (down to 20 Hz, the lower limit of human hearing) would require a parabola with a diameter greater than 17 metres (= 342 m/s / 20 Hz).

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  • 9' Satellite dish turned into Parabolic Listening Device ...

    2015-6-11  Greetings, Is it possible turn a 9' Satellite dish into a semi long range listening device. I ask this because a neighbor has installed a 9' satellite dish facing our property. The dish is roughly 2000 feet away with an unobstructed view from on top of a hill. The dish is pointed directly...

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    2 天前  The equation describing a parabola is y = x 2 / 4P where P is a constant, as shown on the graph. What’s so special about a parabola? It’s all about that point P, called the focal point. Imagine a bunch of ball bearings rolling across a table in straight lines parallel to the y-axis and hitting the inside of the parabola, which is lying on ...

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  • Roll Your Own Parabolic Microphone Hackaday

    2012-9-26  Parabolic microphones are used to listen in from a distance. You see them on the sidelines of NFL football games, but they’re part of the standard issue in detective and spy novels. Now you c

  • Dollar Store Parabolic Mic : 9 Steps (with Pictures ...

    Dollar Store Parabolic Mic: This is a ridiculously easy way to build a very functional parabolic microphone using mostly items purchased from one of those stores where everything is a dollar. Check out the original design at: .Dollar Store Parabolic Microphone

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    2018-3-16  With the birth of listening devices able to amplify sounds from a distance, listening to birds has been an integral part of bird watching or birding. The advancement in this technology has also encouraged many people to try birding as a hobby. Many birders enjoy bird listening rather than bird watching to the point ...

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