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Topic: Horn (acoustic)

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	Acoustic Radar.
		Acoustic location was originally applied to determining the presence and position of ships in fog.
		Acoustic location was used from mid-WW1 to the early years of WW2 for the passive detection of aircraft by picking up the noise of the engines.
		Whether the horns were of crude flat wood construction as they appear to be, or if the flat panels were a protective casing for a more conventional horn remains a matter for speculation at present.
	www.dself.dsl.pipex.com /MUSEUM/COMMS/ear/ear.htm (1405 words)

	Horn (acoustic) (Site not responding. Last check: )
		Bicycle horns usually consist of a single horn operating at a single resonant frequency, with a reed made of stainless steel, located in the throat of the horn, and supplied with air by a rubber squeeze bulb.
		Automobile horns are generally arranged in pairs, to produce a major third chord consisting of two notes: F and A, sounded together.
		The word "horn" by itself is often used to refer to certain musical instruments, most commonly the French horn (as in the words to the popular children's song: "The horn, the horn, it sounds so forlorn"), as well as the tuba.
	www.toolhost.com /Horn_(acoustic).html (789 words)

	Acoustic horn for use in cellular flip phones - Patent 5832079
		In a preferred embodiment, a flared acoustic horn of the exponential type is formed as an interior cavity within a flat, planar flip element associated with a cellular radiophone unit.
		In a particularly preferred embodiment, the flared horn 26* is (as is the flared horn 26' of FIG.
		Clearly, acoustic reciprocity dictates that the methods and apparatus taught in the present invention are equally applicable to routing the output sound from interiorly mounted electromagnetic transducers via a rotary acoustic joint to an output acoustic horn.
	www.freepatentsonline.com /5832079.html (2845 words)

	Acoustic Fingerstyle Guitar Page
		It is used for classical guitar, and some other acoustic styles, but it has found its way into other genres as well.
		American fingerstyle guitar is commonly played on steel string acoustic guitars with 6 or 12 strings.
		Acoustic Fingerstyle Guitar, copyright © 1998 Paul Kucharski.
	www.acousticfingerstyle.com (493 words)

	OrdinaThor_Loudspeakers_Horn - fullrange speakers, horn, high efficiency, tqwt, multiple arrays, general audio topics>
		After 1928, horn loudspeakers were only found in theater PA systems, until the introduction in the late '40s of the Klipschorn, which spawned a revival of horn loudspeakers in the '50s.
		A horn can be seen as an acoustic transformer that couples the air at the surface of the diaphragm with the air in the listening room, thus matching high pressure/low volume to low pressure/high volume.The name acoustic (impedance) transformer derives from this model of description.
		The front horn will (again depending upon it's profile) give a certain reinforcement to the lower midrange, so ideally this horn is designed to raise the lower midrange to the level of the "bump" in the drivers frequency response.
	yu-ra.tripod.com /horn.htm (1555 words)

	Horn Loudspeaker Design - Theory And Practice by Randy Bankert of O. S. Services, Inc. and North American Distributor ...
		The first horn speaker was basically a horn attached to a receiver, and although the sound quality was quite bad it was better than what had been possible prior to the invention of the triode output tube.
		With an OMNIRAY HORN, the acoustic image and the timbre of musical instruments is reproduced with uncanny fidelity, perfectly restoring the "live" scenery with all its dynamic qualities in a fashion never possible before.
		The only circular horns prior to the Omniray design were megaphones which merely amplified the human voice and were not suitable for use in high-end audio applications.
	www.enjoythemusic.com /magazine/manufacture/zingali.htm (1630 words)

	"Horn Sound" in defense of conical horns
		By virtue of the changing wall angle, the curved wall horn horn has a dramatic change in its radiation pattern (the main reason constant directivity horns were developed).
		Horns like an Altec 311 / 511 / 811 can produce close to flat response on axis, not because there drivers are flat up that high but because of narrowing directivity with increasing frequency.
		Seriously, I have measured hundreds of horns with my TEF and built many, I am not able to think of any aspect of a straight sided horn that is a negative, other than the inferior low frequency loading, there constant angle, simply mimics the acoustics of radiating into some specific angle.
	www.snippets.org /pipermail/diyspeakers.new/2002-May/009284.html (1655 words)

	What is horn antenna? - a definition from Whatis.com
		In order to function properly, a horn antenna must be a certain minimum size relative to the wavelength of the incoming or outgoing electromagnetic field.
		Horn antennas are commonly used as the active element in a dish antenna.
		Horn antennas are used all by themselves in short-range radar systems, particularly those used by law-enforcement personnel to measure the speeds of approaching or retreating vehicles.
	searchmobilecomputing.techtarget.com /sDefinition/0,,sid40_gci214327,00.html (369 words)

	Chris Report - 05-07-2001
		The horn of the gramophone amplified the mechanical oscillations of a pin running along a groove in a disc producing a sound that could be heard by the human ear.
		Horn loudspeaker pioneers designers as Gustavas, Webster, Klipsch and Voigt required decades in order to explore the laws of the horn technology.
		Famous classics horn loudspeakers designs were “The Voice Of The Theatre” designed by Altec Lansing, the Klipschorn by Paul Klipsch, the Imperial Hyphex Horns by Jensen Manufacturing Company, the Voigt Domestic Corner Horn by Paul Voigt of Voigt Patents Ltd and Acousta and Audio-vector by Lowther.
	www.1388.com /news/chris_report/05-07-2001/index.html (566 words)

	horn antenna - a definition from Whatis.com
		A horn antenna is used for the transmission and reception of microwave signals.
		Horn antennas are commonly used as the active element in a dish antenna.
		Horn antennas are used all by themselves in short-range radar systems, particularly those used by law-enforcement personnel to measure the speeds of approaching or retreating vehicles.
	whatis.techtarget.com /definition/0,289893,sid9_gci214327,00.html (274 words)

	GE Energy - Frequently Asked Questions
		Placement of the acoustic cleaner is also important to ensure buildup areas are properly addressed.
		For example, the ambient noise of an acoustic cleaner being sounded in a thin wall storage bin will be louder than an acoustic cleaner being sounded in a well-insulated boiler.
		Acoustic cleaners also require gravity and/or gas flow to sweep away the particulate that has been resonated or fluidized by the acoustic energy.
	www.gepower.com /prod_serv/products/particulate_matter/en/bha_pacs/faq.htm (472 words)

	A Small Coal Ash Generator Used For Acoustic Agglomeration
		The acoustic horn was made in three sections (2 aluminum sections near the horn and 1 stainless steel type 304 section next to the hot inconel pipe).
		The stainless steel horn section was water cooled to prevent heat transfer to the rest of the horn from the adjacent high temperature pipe and flows.
		The large acoustic pressure fluctuations actually result in increases (and decreases) in sound speed at the peak (or trough) of the wave until acoustic shock waves are produced similar to the wave breakers in the ocean.
	www.tvu.com /PAAWeb.htm (6646 words)

	FEM's of Bass horns in Various Orientations in Rooms (Site not responding. Last check: )
		The primary goal was to investigate alternative methods of using the room corner and a space between the horn and the wall to extend the acoustic length of the horn.
		It is about the size of a LAB horn (24" x 48") which is also the size of the 27hz horn that was measured.
		This orientation puts the horn mouth at the rear of the 'wedge' of air between the room boundary and the horn wall.
	ldsg.snippets.org /HORNS/basshornfea.html (481 words)

	Corner reflectors
		The operation of a horn as an electromagnetic directing device is analogous to that of acoustic horns.
		However, the throat of an acoustic horn usually has dimensions much smaller than the sound wavelengths for which it is used, while the throat of the electromagnetic horn has dimensions that are comparable to the wavelength being used.
		Horn radiators are readily adaptable for use with waveguides because they serve both as an impedance-matching device and as a directional radiator.
	www.tpub.com /neets/book18/81d.htm (898 words)

	Axess - Plastic Joint Technology (Site not responding. Last check: )
		In this technology the contact of the horn to the plastic part is further from the joint welding area.
		It is the extension of the horn and behaves to the same physical laws.
		The horn is transmitting the mechanical vibration energy to the stud.
	www.axessultrasonics.com /technology.aspx (506 words)

	Avantgarde Acoustic
		The horn curvature follows exactly the physical-mathematic terms of spherical horn calculations and the proportions of the 2 new horns preserve the typical Avantgarde Acoustic appearance.
		Compared to the smallest Avantgarde Acoustic midrange horn so far, the SH5702 of the UNO, the horn mouth of the SH5003 has been reduced to 500 mm (instead of 570 mm), but the horn throat has been expanded to 75 mm (instead of 50 mm).
		Thus Avantgarde Acoustic was able to significantly reduce the cabinet dimensions and still ensure a precise reproduction of even the lowest notes.
	www.avantgarde-acoustic.de /hoerner/02.php?sprache=en&produkt=metapicco&produkt_id=9 (924 words)

	Untitled Document (Site not responding. Last check: )
		The way the horn achieves this performance advantage is by coupling the motion of the solid diaphragm to the fluid air more efficiently.
		Horns played an important part in the motion picture industry from the beginning and are still utilized today in the vast majority of movie theaters.
		Coupling the compression driver to a horn provides a frequency response capability the size of the mouth of the horn, as well as an improved acoustical load on the diaphragm.
	home.earthlink.net /~krluzzi/outpost/k2.html (1259 words)

	Single Driver Website
		Horns can be thought of as providing sound reinforcement to a transducer (usually a compression driver).
		A horn increases the directivity of the compression driver, providing increased SPL in a certain area, over the frequency range for which the horn is designed.
		However, round horns and radial horns tend to change their angles of spread (their directivity, measured by the directivity index, or DI) as the frequency changes.
	melhuish.org /audio/horn.html (827 words)

	Sound & Communications - Audio
		An acoustic horn is a device in which the sound is channeled through a gradually expanding cross-sectional area from the driver end (throat) to the radiating end (mouth).
		The top region of horn directivity is that produced by the directional characteristics of the throat, generally as defined by the opening where the compression driver is mounted.
		Where multiple horns are arrayed to cover the same frequency range, interference effects will cause response irregularities (called comb filtering because of the shape of the resulting frequency response curve) in the overlap zones.
	www.soundandcommunications.com /audio/2005_09_audio.htm (3375 words)

	Acoustic Horn - aluminum horn loudspeakers - Measure
		Until this point, all horns used the exponential, hyperbolic and tractrix flare.
		In 1986, while making a pattern for a bi-radial type flare, I came across the straight conical horn, a wood mock-up which was used as a development tool.
		Using cast aluminum, a horn was made for the specific use on these speakers of the past.
	www.acoustichorn.com /about_ah.html (474 words)

	VictorySiren.com - Horn & Whistle - Issue 10 - More on Loudest Sounds
		With all the recent trends to electronics and electronic related devices (radio, satellites, lasers, etc.), the acoustic signal seems to be all but forgotten.
		An air cooled diesel or gas turbine engine of similar power and torque characteristics as the original engine, independent rotor-chopper drive, and horn extension, along with a complete overhaul and dimension tolerance check and balancing of moving parts, would bring it up to date.
		Using 3 or 4 air horn diaphragm assemblies merged into a common horn is another way of developing a high power signal.
	www.antiqueweekend.com /x/articles/HW10/HW10.htm (995 words)

	Horn (Site not responding. Last check: )
		The hornist would grip the horn on the piping near the mouthpiece and rest the body of the horn across his arm so that only one hand was needed to play and the other could be free to guide his steed.
		The player now held the horn with both hands, holding the tubing near the mouthpiece with one, and putting the other into the bell, which was either rested upon the right knee of the player or the entire horn was lifted into the air.
		Around 1815, the horn took on new form, as valves were introduced, which allowed the player to switch between crooks without the effort of manually removing one from the horn and inserting a new one.
	www.websters-online-dictionary.com /definition/horn (4660 words)

	Acoustic Horn - solid cast high quality aluminum horn loudspeakers
		As mentioned down-page, one of his horns got held up in customs (last year some of his stuff got sent to Peru, and didn't come back for 6 months!), but he still was able to come up with a very good sounding rig with two mismatched mid/treble horns!
		The “basic” speaker is a two-way design utilizing two in-house designed and built field coil compression drivers: a midrange unit which fires into a conical horn (designed by Bill Woods of Acoustic Horn Audio), and a woofer driver firing into an approximately 10 foot long bass horn.
		This years’ iteration included a small tweeter horn, as well as two “conventional” subwoofers (the latter used in lieu of the enormous Cogent subwoofer horn).
	www.acoustichorn.com (467 words)

	Horn and Whistle Magazine: Source for horns, whistles, sirens, and related information
		Horn and Whistle is the quarterly journal of the Horn and Whistle Enthusiasts' Group (HWEG), founded by Jack Hardman in 1982.
		HWEG is dedicated to the preservation, increase and dissemination of knowledge re-garding horns, whistles, sirens, bells and other acoustic devices used in signaling and warning applications in industrial, mun-icipal, maritime and railroad environments.
		Horn and Whistle takes you to normally off-limits power plants, pumping stations and other steam powered facilities with professional articles packed with detail.
	www.hornandwhistle.net (505 words)

	horn.demo (Site not responding. Last check: )
		The French horn passage that can be heard by clicking on the image below was passed through a waveform analyzer, and its spectrogram was computed.
		The spectrogram (right panel) represents the distribution of acoustic energy at different frequencies over time (the redder the area, the greater the intensity of the acoustic energy).
		Compare the spectrogram for the French horn passage with the one at the bottom of the page for a passage on a bugle, which is a higher-pitched and acoustically-simpler instrument.
	www.columbia.edu /itc/psychology/rmk/T2/horn.demo.html (155 words)

	Avantgarde Reviews: UNO - Udo Ratai, Image HiFi
		Horn loudspeakers were born at a time when [tube] amplifier watts were rare.
		Spherical horns do not focus the sound as much as their exponential cousins but do concentrate the direct wave front to a far higher degree than conventional loudspeakers.
		Only corner horns that use the listening room sidewalls as an extension of their throat area are capable of reproducing truly low bass.
	www.avantgarde-usa.com /review_12.html (1715 words)

	AudioEnz - Customised or correct? (Site not responding. Last check: )
		Horn speakers endured a similar economic squeeze, or should that be '80's speak, "downsizing" back in the late fifties when stereo hit and "whoops, you can't fit two of those here".
		Acoustic suspension, or latter fancy tuned venting, really requires big clean multi-kilowatts for fidelity with sonic impact that's comparable to a proper horn system.
		Folding the horn around and around works, but it's very expensive because you have to be extremely careful that the folding process doesn't introduce extra tonal characteristics whereby your Fender bass guitar develops interesting, but decidedly naff tuba-like voicing.
	www.audioenz.co.nz /2000/1104.html (1641 words)

	Edward Christopher Wente
		In the acoustic phonograph, the recording artist spoke or played into a large acoustic recording horn, at the end of which was a recording stylus poised over a spinning disk of highly polished soft wax.
		Still needed for good sound with motion pictures were high-quality transducers to convert from acoustic to electric energy, from electric to acoustic energy, and from electric energy to a permanent reproducing record.
		Truly, “Modern acoustics may be said to have begun with the development of the condenser microphone by Wente,” as stated by Olson and Massa (Applied Acoustics, 2nd ed.
	www.coutant.org /ecwente.html (1031 words)

	Stereophile: Calix Phoenix Grand Signature loudspeaker
		The farfield acoustic measurements are therefore affected by an early reflection from the floor; while it was possible to window this reflection out of the MLSSA time window in order to calculate the frequency responses, this does degrade midrange resolution.
		The horn was aimed precisely at the microphone for the measurements, using the precision screw on the horn support pillar.
		As mentioned earlier and as revealed by the step responses in fig.6, this late arrival is the horn's output (red trace), connected, as it appears, in inverted acoustic polarity to the tweeter and woofer (blue).
	www.stereophile.com /loudspeakerreviews/861/index5.html (1581 words)

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