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Topic: Parabolic microphone

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	Parabolic Microphones
		A parabolic microphone is an ordinary microphone mounted inside a sound-reflecting dish having a parabolic cross section.
		Sound waves passing straight into the parabolic reflector are focused by it on the microphone; sounds entering the reflector dish from other angles impinge directly on the microphone, but are not focused on it by the reflector.
		In a parabolic microphone system, the microphone is placed at this point; sound waves entering the dish parallel to the axis are focused on the microphone and, thus, amplified.
	www.espionageinfo.com /Nt-Pa/Parabolic-Microphones.html (292 words)

	Parabolic
		A Parabolic Microphone uses a parabolic reflector (or dish) to collect and focus sound waves onto a microphone receiver, in much the same way that a parabolic antenna (e.g.
		Parabolic Microphones are generally not used for standard recording applications, because they tend to have poor low frequency response as a side effect pf their design.
		The means and uses of the Parabolic Mics are far and wide, however it is up to the Investigator to put it to the test and use it under a controlled environment (interior).
	www.epicparanormal.com /parabolic.htm (352 words)

	Microphones - █ further reading:
		Parabolic microphones are the most unidirectional microphones, therefore, they have to be pointed directly at the source of sound.
		Parabolic microphones are used for distance surveillance as the best ones can pick up sounds from as far as 300 yards.
		Microphones are used as security devices alone or in combination with other instruments such as fingerprint scanners, retinal scanners or passwords, to secure access to high security areas or computers.
	www.espionageinfo.com /Lo-Mo/Microphones.html (692 words)

	Types of Microphones
		Shotgun microphones, the most directional form of studio microphone, reserve most of their sensitivity for sounds directly in front of, and to a lesser extent, the rear of the microphone.
		Parabolic microphones are not typically used for standard recording applications, because they tend to have poor low-frequency response as a side effect of their design.
		A microphone with a cardioid directional characteristic is effectively a superposition of an omnidirectional and a figure-8 microphone; for sound waves coming from the back, the negative signal from the figure-8 cancels the positive signal from the omnidirectional element, whereas for sound waves coming from the front, the two add to each other.
	www.edinformatics.com /inventions_inventors/microphone.htm (2304 words)

	Telinga Microphones - Whitepapers
		Conversely, a microphone which records something, as it sounds 50 meters away from it, is a microphone which is actively doing something with the incoming sound.
		We have a recordist with a microphone 50 meters away from a bird, and he wants to reproduce the sounds of the bird as it sounds where the bird is. He cannot move closer - which is the only correct way - because he fears that the bird will fly away.
		The Pressure Zone Microphone: The PZM principle uses the compression and decompression of air between a plate and a membrane in parallell with the plate, very close to it, a millimetre or less.
	www.telinga.com /attach.htm (1719 words)

	microphone, microphones wireless microphone parabolic microphone stands, dynamic microphone stand, directional ...
		The ADX51 is a pre-polarized condenser microphone designed to handle a wide variety of live, studio and broadcast applications.
		The ADX-60 is a pre-polarized condenser microphone designed to handle a wide variety of recording and live sound applications as well as permanent installations.
		SSE Music offers microphone, microphones, wireless microphone, wireless microphones, parabolic microphone, microphone stands, dynamic microphone, microphone stand, directional microphone, cordless microphone, for la crosse, wisconsin, minnesota, minneapolis, madison, eau claire, milwaukee, st paul, twin cities, iowa, and surrounding Wisconsin communities.
	www.ssemusic.com /microphones.asp (322 words)

	Parabolic microphone for spying short guide
		A parabolic microphone, often referred to as shotgun microphone(altough to be a parabolic one it needs to have a dish), can be used to to pick up and record wildlife sounds or spy on people by listening to their conversations from a distance.
		In a nutshell, a parabolic microphone employs a dish to collect and focus available sound into the waiting mouth of a mic element mounted in front of the dish at it's focal point.
		These parabolic microphones are not to be used as spy equipment by anyone outside law enforcement and intelligence agencies.
	www.spy-equipment-buying-guide.com /parabolic-microphone.html (262 words)

	Parabolic microphone (Site not responding. Last check: )
		A parabolic microphone uses a parabolic reflector to collect and focus sound waves onto a microphone receiver, in much the same way that a parabolic antenna (e.g.
		Parabolic microphones are generally not used for standard recording applications, because they tend to have poor low-frequency response as a side effect of their design.
		Sound entering the parabolic dish from the front axis is reflected into a sphere around the "focus" of the dish, where the microphone element is located.
	www.serebella.com /encyclopedia/article-Parabolic_microphone.html (313 words)

	quiet american
		Microphones require 'monitoring' (listening to the recording as it is made, by wearing headphones) in direct proportion to their degree of directionality.
		I wear microphones in a headband that appears, to the casual observer, to be a pair of headphones, and I don't monitor with headphones.
		Schoeps microphones, praised for their sound, are widely described as being sensitive to such factors (particularly humidity), though whether this is a result of their design or something that can be alleviated by rigorous cleaning is less clear (and I might add irrelevant if your mics fail you in the field).
	www.quietamerican.org /links_diy-mics.html (2813 words)

	The Macaulay Library
		The parabolic reflector system is the combination of a reflector dish, typically between 13" and 36" in diameter, and a microphone.
		The microphone is positioned in the focal point region of the reflector (the area where all the collected sound is concentrated).
		Microphones suitable for use in parabolic reflectors range in price from $300-$1,200, with the more expensive units yielding flatter frequency response, improved signal-to-noise ratios, and higher signal level overload capabilities.
	www.birds.cornell.edu /MacaulayLibrary/contribute/equipParabola.html (287 words)

	JVC Professional Technical Description page
		One of the most obvious uses for the "Super Beam" microphone is at a live sporting event where the broadcaster wants to pick up sounds from the playing field, boxing ring, or race track from a distance.
		Parabolic microphones have been previously used in these applications, and the benefit of using the "Super Beam" microphone is greatly improved sound quality.
		When connecting directly to the microphone head, a breakout cable with a 7-pin connector on one end, and two 3-pin XLR connectors on the other must be used.
	pro.jvc.com /prof/attributes/tech_desc.jsp?model_id=MDL100372&feature_id=02 (1627 words)

	Microphones, newcomer's guide to wildlife sound recording from the Wildlife Sound Recording Society
		The microphone is your first point of contact with the sound, and it is a false economy to skimp on this vital part of the system.
		The microphone needs to pick up sounds from the whole surface of the dish, which is why using a very directional mic like a shotgun mic is not recommended.
		Telinga manufacture a range of parabolic microphone systems commercially, although the cost of over £800 is a bit more than many people wish to spend at the beginning.
	www.wildlife-sound.org /equipment/newcomersguide/microphones.html (1076 words)

	Big-E Stereo Parabolic Microphone
		Typical parabolic microphones are monophonic, this unit has a stereo audio path that helps produce more realistic sounding audio.
		The microphones are mounted on a metal standoff that places them at the focal point of the parabolic reflector.
		The optimal microphone position can be found by pointing the reflector at a distant audio source, then moving the microphones for the loudest sound.
	www.technick.net /public/code/cp_dpage.php?aiocp_dp=cir_solorb_bige (750 words)

	Pointsource - Audio Project Idea; Boundary-layer dish microphone.
		The microphone capsule that you use for this project needs to be an electret unit with an omnidirectional polar pattern.
		One possibility for improving the distortion characteristics of the microphone is to use a polypropylene capacitor in the biasing circuit.
		Boundary-layer microphones are not overly sensitive to wind-noise, but in the case of the dish microphone, at least, it can sometime cause the odd problem.
	free.prohosting.com /~pointsrc/audio/dish.html (1946 words)

	Parabolic Microphone - Audio amplification (Site not responding. Last check: )
		For its size, this is probably the world's best "parabolic" microphone.
		Developed and constantly updated, this professional quality "long range" microphone is widely accepted by video, film and recording engineers.
		It has excellent sensitivity: the EPM is capable of picking up and magnifying signals up to 75 times that of a normal omni-directional microphone while remaining virtually impervious to overload.
	www.polsec.com /products/parabolic_microphone.php (96 words)

	diyAudio Forums - Parabolic Microphone Reflector
		The position of the microphone must be carefully adjusted by extensive tests, because it's not possible to simply put the microphone instead of the LNA, which phase center is generally not well known.
		The increasing efficiency with frequency of parabolic reflector is normal at audio frequencies, as well as radio frequencies.
		But this is true only for a near strictly parabolic reflector (as SATV dish) not for umbrella or such approximate reflector, which exhibit a maximum efficiency for a particular wavelenght, depending of the actual incurvated form.
	www.diyaudio.com /forums/showthread.php?postid=73438 (440 words)

	Telinga Microphone Sales
		They are the finest handheld parabolic microphones available for nature recording.
		To demonstrate the differences in microphone types, I have done a comparison between a typical voice mic (a Sony ECM-959A), a "Long Shotgun" (Sennheiser K6/Me-67) and a Telinga "Dual Science" parabolic microphone.
		The Stereo Microphone, which is a wonderful stereo parabolic mic.
	www.naturesongs.com /Telinga.html (712 words)

	Audio Equipment - Intercept Investigations (Site not responding. Last check: )
		The 12" plastic parabolic reflector is specially designed to reflect low frequency sound waves towards the microphone and reject unwanted 'background' noise, providing the highest possible gain and signal to noise ratio.
		The omni-directional microphone and amplifier may be used without the reflector, or add the included reflector for higher audio gain and directivity.
		This microphone looks like an ordinary pen, and is actually contained within a real (non-working) pen, but it’s actually an extremely high gain, two-stage, pre-amplified microphone which significantly increases audio levels over those achieved with non-amplified microphones.
	www.intercept-spytech.com /Audio.html (1451 words)

	Microphones: SPY SHOPS 1st stop for spy,surveillance,camera,stealth,police,microphone equipment spy shop (Site not responding. Last check: )
		Developed over a three year research period and constantly updated, this professional quality "long range" microphone is widely accepted by video, film and recording engineers the world over as the "beat in its class.' Unit comes complete with a vinyl covered 'hard' carrying case with fitted compartments for the microphone components.
		PROFESSIONAL QUALITY The newly designed EPM Parabolic microphone is a high performance unidirectional microphone perfectly suited to the requirements of the motion picture and broadcast industries, tape recordings, monitoring and other applications.
		The EPM is one of the most directional microphones ever produced; making it possible to hear and record voices, sounds, practically anything - to professional standards without having the microphone anywhere near the source.
	www.netside.net /~spyshops/Microphones3.html (241 words)

	microphone
		The rubber bands that stretch between the rods hold the microphone element and insulate it from sounds passing through the mounting.
		This system allows you to adjust the position of the microphone so that it is at the focal point of the parabolic dish, which for me was 4 1/2".
		Since the parabolic reflector has a mirror surface you should paint it with a dull color to prevent startling either the birds or your neighbors.
	www.bio.umass.edu /biology/kunkel/gjk/microphone.htm (241 words)

	Instructions for use on the parabolic microphone during EVP collection
		This microphone (pictured above left) is based on certain information I have gathered while investigating evp activity when you have a clear understanding of my research findings the mike should function above its normal capacity to record sounds.
		However with a parabolic microphone it can pick up whispers at 100 feet this should allow it to pick up evps in a tight area the paranormal subject may not even realize that it can be recorded at far distances and therefore would not hesitate to speak.
		The other unique thing about this microphone is the incorporated PZM technology this allows all sound to be received at roughly the same impact.
	www.pararesearchers.org /Ghosts/parabolicmic/parabolicmic.html (570 words)

	Parabolic microphones and stereo sound (Site not responding. Last check: )
		The microphone connection is improved and - to allow long cables - the output impedance is lowered to 200 Ohms.
		The stereo separation depends on the size and characteristics of the separating shield and the distance between the shield and the microphones.
		Because the microphone elements are very close to the shield - only 1 mm - the shield is still big enough to create a stereophonic "space" of the background sound picture, which disappears completely if the channels are shorted, or if one uses one channel only.
	user.bahnhof.se /~telinga/stereo.htm (1527 words)

	Parabolic Microphone
		Parabolics should be at least 18 inches in diameter for this purpose.
		Any Type of Microphone can be used, But I prefer using a speaker as a Microphone.
		For a better setup, Use a Large parabolic as your main dish and a Small parabolic behind the Mic.
	www3.telus.net /chemelec/Projects/Parabolic-Mic/Parabolic-Mic.htm (234 words)

	A typical parabolic microphone setup will pick up a narrower cross
		The frequencies for which this generalization applies depends on the width of the parabolic dish and the dinner plate (or boundary) of the flowerpot mic.
		From what I understand, parabolic microphones do not amplify all frequencies equally, so when recording bird calls you get what is called a "colored" frequency response.
		A typical parabolic will produce much more signal gain compared to the PZM "flowerpot" design on the oldbird website, but the latter will pick up a wider cross-section of sky.
	www.oldbird.org /parabolic-a.1.htm (293 words)

	Homemade Parabolic Shotgun Mic Microphone
		Build a parabolic mic out of a plastic umbrella, a 18" and up satellite dish or something like the green one shown above this is a 30" plant aquarium that is mount on a steel frame and has survived 35 years in the weather and one bullet wound.
		Most of the reasonably well-made cassette recorders coupled with a microphone mounted in a parabolic dish make for a pretty good recording system they must have a microphone input jack.Look for these Features are: Stereo record input, graphic equalizer, tape counter, VU meter, headphone jack, tape/source monitor switch, and a carrying case/strap.
		The microphone elements will be improved by mounting them in a parabolic dish, and will greatly improve both the amplification and direction.
	www.zteck.com /alien/parabolic.htm (1501 words)

	Making Your Own Parabolic Microphone - Bigfoot Forums
		When you begin to bend the wire to make the microphone frame, the easiest thing I found to do was to straighten out the wire first, then, using the extra PVC pipe that you have, bend the wire around the pipe to form a circle in roughly the middle of the length of wire.
		A parabolic shaped dish is absolutely crucial if you really want to extend the range of the mic to hear/record those sounds that are far away or even really quiet sounds that are close by.
		There are ways to build a true parabolic dish, but by the time you research it, buy the materials, assemble it and test it for suitablility/durability under field conditions, the $30 to $40 price tag for a lightweight aluminum dish from American Scientific will look cheaper and cheaper all the time.
	www.bigfootforums.com /index.php?showtopic=524&hl=parabolic (3219 words)

	Microphones
		Early crystal microphones used Rochelle salt because of its high output, but it was sensitive to moisture and somewhat fragile.
		The electric output of crystal microphones is comparatively large, but the frequency response is not comparable to a good dynamic microphone, so they are not serious contenders for the music market.
		One directional technique used is the "stereo microphone" which may be constructed from two condenser microphones attached to each other so that their peak response directions are 90° apart.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/mic3.html (291 words)

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