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Topic: Acoustic coupler

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	Response-modifying acoustic couplers for hearing aids - Patent 4677675
		As aforementioned, the acoustic mass increases inversely with the cross-sectional area and the acoustic resistance increases inversely with the square of the cross-sectional area and in proportion to the square root of frequency, at higher frequencies.
		In the coupler 50, the path of acoustic energy propagation is from the output port 16 of the hearing aid unit and through the passage 60 and thence through the chamber 67 and into the passage 56 of the output coupling 54.
		Resistor 75 and inductor 76 represent the resistance and inertance of the passage 60; capacitor 77 represents the compliance of the chamber 67; resistor 79 and inductor 80 represent the resistance and inertance of the passage 68; and capacitor 81 represents the compliance of the chamber 59.
	www.freepatentsonline.com /4677675.html (5326 words)

	Universal flexible acoustic coupler muff system - United States Patent 3,992,583
		This universal acoustic coupler system is comprised of a pair of flexible muffs, which are rotatably mounted to permit connection to any length telephone handset receiver/transmitter; this feature also permits any varying angles of the earpiece and mouthpiece.
		Accordingly, it is an object of the present invention to provide a universal, flexible acoustic coupler muff system which allows flexibility of movement to accommodate various sizes of telephone receiver handsets, both in earpiece/mouthpiece diameters, as well as varying center distances between earpieces and mouthpieces.
		Acoustic muffs 12 and 14 are connected to terminal 10 by way of a screw or snap-in retaining pin 54 which passes through circular aperture 48 (as shown in FIG.
	xrint.com /patents/us/3992583 (2506 words)

	Acoustic coupler - Patent 5265614
		An acoustic coupler according to claim 1, wherein said acoustic coupler further comprises stopper means fitted to the ultrasound probe for increasing friction between the ultrasound probe and said inlet means when the ultrasound probe is pushed into said inlet means, said stopper means being able to be removed from the ultrasound probe.
		An acoustic coupler according to claim 1 further comprising stopper means fitted to the probe for increasing friction between the probe and said inlet means when the probe is pushed in said inlet means, said stopper means being able to be removed from the probe.
		The second object of fabricating the acoustic coupler using the PVA gel is achieved by increasing the hardness of the PVA gel around the inlet structure by partially increasing the concentration, polymerization degree and/or the degree of hydrolysis of the PVA gel and/or partially repeating the refrigerating process.
	www.freepatentsonline.com /5265614.html (7016 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-21)
		acoustic data transmission helps to reduce strongly the complexity of the communication interface in the payment terminal device and the costs connected thereto, as the acoustic coupler is a well known data transfer method, so no difficulties are to be expected in the realisation of the payment terminal.
		The use of an acoustic coupler has the additional advantage that the data connection between the mobile phone and the payment terminal is universal, and can be used by any phone independently of connectors, manufacturer design, appropriate interfaces and the like.
		The coupling means 20 may use an acoustic coupling or an acoustic coupler using the microphone 17 in order to receive information using voice as a carrier from a loudspeaker 16 of the mobile telephone 14 that is attached or mounted to the acoustic coupler of the coupling means 20.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/88165.031023&ELEMENT_SET=DECL (5727 words)

	Acoustic coupler -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		With the increased use of computing, acoustic couplers were used to connect ((from a combination of MOdulate and DEModulate) electronic equipment consisting of a device used to connect computers by a telephone line) modems to the telephone network.
		Usually, a standard telephone handset was placed into a cradle that had been engineered to fit closely (by the use of rubber seals) around the (Device for converting sound waves into electrical energy) microphone and earpiece of the handset.
		Speeds were typically 300 bits per second achieved by modulating a (A rack attached to a vehicle; for carrying luggage or skis or the like) carrier at 300 ((computer science) a data transmission rate (bits/second) for modems) baud.
	www.absoluteastronomy.com /encyclopedia/a/ac/acoustic_coupler.htm (378 words)

	Acoustic coupler - Patent 4119941
		1 one embodiment 10 of the acoustic coupler which is connected to an existing hydrophone 12, and another embodiment 14 of the acoustic coupler which is connected to an existing hydrophone 12, both existing hydrophones 12 being connected by a cable 16 to a shore station 18.
		The acoustic coupler embodiment 10 includes a strength line 34, such as a wire, an anchor 36 which is connected at one end of the strength line, and a float 38 which is connected at the other end of the strength line so that the strength line will be suspended vertically upward in the water.
		The acoustic coupling may be accomplished by feeding the modulated carrier wave to the projector 22 and directly connecting the projector 22 to the existing hydrophone 12 by the clamp 26.
	www.freepatentsonline.com /4119941.html (2245 words)

	Acoustic coupler
		Popular in the 1970's the acoustic coupler was a device that allows a computer to connect to other computers.
		The first acoustic couplers connected to the phone handset and transmitted at a speeds of 300 baud as analog sound signals that were transferred to digital by the acoustic coupler.
		Although couplers are not commonly used today, they are still used as a solution for travelers who may not have access to a modem or network connections and are capable of transmitting at much faster speeds than the early couplers.
	www.computerhope.com /jargon/a/acoustic.htm (146 words)

	acoustic coupler
		The acoustic coupler converts digital output from a computer to sound signals that can be sent via a telephone line.
		At the receiving telephone, a second acoustic coupler or modem converts the sound signals back into digital data for input into a computer.
		Unlike a modem, an acoustic coupler does not require direct connection to the telephone system.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0034255.html (226 words)

	Four-Port Fibre Frequency-Shifter with a Null Taper Coupler
		The mechanism of the acousto- optic interaction is unchanged, because the waist of the taper coupler is a similar waveguide to the waist of a single taper.
		In the latter, both modes of the coupler waist are excited by an input in one fibre, but happen to have the right phase relationship at the end of the coupler to return the light to the same fibre.
		A flexural acoustic wave was excited in the coupler waist using a PZT disc with a concentrator horn, driven by an RF signal.
	www.ecs.soton.ac.uk /publications/rj/1994/ofg/birks/birks.html (2072 words)

	Encyclopedia: Acoustic coupler (Site not responding. Last check: 2007-10-21)
		A telephone handset A touch-tone telephone dial Telephone The telephone or phone (Greek: tele = far away and phone = voice) is a telecommunications device that transmits speech by means of electric signals.
		Carrier has several different meanings: in telecommunication, a carrier wave in biology, an asymptomatic carrier or a carrier-protein the Carrier tribe, a First Nations tribe living in British Columbia, Canada; also the name of their Athabaskan language a common carrier, a transport business (shipping or telecom) an aircraft carrier...
		In telecommunications and electronics, baud (pronounced) is a measure of the signaling rate which is the number of changes to the transmission media per second in a modulated signal.
	www.nationmaster.com /encyclopedia/Acoustic-coupler (814 words)

	ISVR Consulting - ear simulators
		An acoustic coupler is a simple cavity of specified shape and volume which is used for the calibration of an earphone.
		Unlike the coupler it presents to the earphone an acoustic load impedance equivalent to that presented by the average human ear.
		Couplers, artificial ears, ear simulators, and head and torso simulators are used in audiology for the calibration of audiometers and measurements of hearing aid response, in the audio and telecommunications industries for measuring the frequency responses and sound output levels of earphones and telephones, and in research for studies of hearing and sound perception.
	www.isvr.co.uk /audioetc/earsimulators.htm (820 words)

	UNC Virtual Museum -acoustic coupler (Site not responding. Last check: 2007-10-21)
		The forerunner of the modem, the Acoustic Coupler provided a means of connecting computer equipment to the telephone company's equipment in order to send information.
		Rather than connect directly to telephone lines as today's modems do, a telephone handset was actually placed into the acoustic coupler's cradle.
		The acoustic coupler was in widespread use during the late 1960's, when computers were still very big and expensive, and limited to use in offices that could afford them.
	www.cs.unc.edu /Outreach/vr/computer_museum/acousticcoupler1.html (84 words)

	Adaptive linearizing acoustic coupling system - Patent 4100373
		The present invention relates to an acoustic coupler system for coupling data signals such as those supplied from a modem device to a telephone line, particularly wherein a non-linear acoustic coupling transducer is employed between the modem and the telephone line.
		Prior to entering coupler 3, digital data signals from modem 1 are combined in an adder 5 with a distortion correction signal obtained from an adaptive feedback network.
		This combining effect compensates for the non-linearity imparted by coupler 3 to that particular type of signal, the characteristics of which cause quantizer 18 to define the address of the presently read-out contents of memory 16, the contents of which have been prepared and updated on the basis of previous data samples.
	www.freepatentsonline.com /4100373.html (3319 words)

	Siemens Communications Lexicon - automatic baud rate detection (ABR)
		An acoustic coupler is a modem from a functional point of view; it supports acoustic data communications via a telephone across phone lines.
		Sender-side, the signals from the originating computer are modulated by the acoustic coupler, then transferred via the phone across the telephone network.
		Before an acoustic coupler can be used on a public telephone network, it needs to fulfill a number of requirements as defined in the ITU V.15 recommendation.
	networks.siemens.com /communications/lexicon/5/f004855.htm (143 words)

	Accessories Hardware - Microtronix Systems Acoustic Telephone Test Equipment
		Acoustic Rubber seals are designed to fit onto the Acoustic Coupler (Artificial Ear).
		Acoustic rubber seals are designed to fit onto the IEC318 Acoustic Coupler.
		The seals are critical to ensure a proper seal between the Acoustic Coupler and the telephone being tested.
	www.microtronix.ca /options.html (826 words)

	Coupler - Wikipedia, the free encyclopedia
		Coupler is a word used to describe any of a number of things:
		A telecommunications device known as a directional coupler;
		A kind of laser mirror known as an output coupler;
	en.wikipedia.org /wiki/Coupler (135 words)

	Review: PM-32 and BackFlip Pocketmail Devices
		Acoustic couplers have the advantage of working with any phone they physically fit.
		The disadvantage of acoustic couplers, and the reason why they're severely out of fashion, is that the bandwidth and signal to noise ratio is crummy.
		The coupler assemblies on the two Devices I checked out are practically identical, but they're otherwise quite different animals.
	www.dansdata.com /pocketmail.htm (2710 words)

	A communications accessory to do BackFlips over (EasyPrint)
		Back in the early 1980s, field reporters used portable computers with acoustic couplers to file their stories over wire services and to bulletin boards from phone booths and land-line phones in remote locations.
		Acoustic couplers are a proven technology for data communications.
		The BackFlip's coupler speaker is fitted on an adjustable, sliding mechanism so that the analog connection between the device and headset fits no matter what kind of phone you're using, as you can see in Figure D. Here's the BackFlip in action.
	www.palmpower.com /issuesprint/issue200003/backflip.html (1316 words)

	What is Acoustic Coupler? Acoustic Coupler Modem Phone Line (Site not responding. Last check: 2007-10-21)
		This is a special cradle in which you place the handset of a phone.
		This is connected to a modem, and the modem accesses the phone line through this coupler.
		Acoustic couplers are best used in transmitting data at lower speeds (300 Baud) due to the environmental noises present in many office environments, and the acoustic couplers inability to block out the resulting interference.
	bugclub.org /beginners/modems/AcousticCoupler.html (89 words)

	3A Review Stereophile
		The acoustic coupler itself has benefited from development research conducted for the soon-to-be-introduced Model 5, and now has an aluminum-alloy cone and an altered magnet assembly.
		Three additional acoustic panels are hung from the ceiling just out from the opposite short wall (which has the largest window in the room, covered with closed, cloth vertical blinds).
		Fig.2 shows (from left to right) the nearfield responses of the active Acoustic Coupler, the woofer, and the midrange unit, the latter two spliced to quasi-anechoic measurements taken at a 50" microphone distance (The axis was 39" above the bottom of the cabinet.) The output of the Acoustic Coupler peaks at 32Hz.
	www.vandersteen.com /pages/3a_rv.html (3851 words)

	acoustic coupler - Enterprise Storage Forum, Leading Edge Coverage of the Storage Industry (Site not responding. Last check: 2007-10-21)
		The acoustic coupler might also contain a modem, or the modem could be a separate device.
		This produces better connections than acoustic couplers and avoids the problems produced by irregularly shaped telephones.
		Still, acoustic coupler modems are useful in some situations, such as in hotel rooms where the telephone cable is anchored to the wall.
	enterprisestorageforum.webopedia.com /TERM/A/acoustic_coupler.html (127 words)

	[No title]
		The reason the connection is slower than a store-bought coupler is because the more expensive ones have a lot of fancy stuff, anti-echoing filters and the like.
		You just strap the coupler to the phone handset, and use the modem normally (after inserting change in pay phones, if needed) I have a store-bought high-end VERY nice acoustic coupler, but the more and more I thought about it, the more and more I saw that my coupler is just an inside-out telephone...
		These are going to hold the phone handset down to the coupler, to maintain as much isolated noise as possible.
	www.hackcanada.com /canadian/phreaking/coupler.txt (1386 words)

	acoustic coupler - Definition of acoustic coupler - acoustic coupler in Encyclopedia - DictionaryWords.net (Site not responding. Last check: 2007-10-21)
		A device used to connect a modem to a telephone line via an ordinary handset.
		The acoustic coupler converts electrical signals from the modem to sound via a loudspeaker, against which the mouthpiece of a telephone handset is placed.
		The earpiece is placed against a microphone which converts sound to electrical signals which return to the modem.
	www.dictionarywords.net /find/word/acoustic+coupler (158 words)

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