WO2009060420A1 - Alert device and method - Google Patents
Alert device and method Download PDFInfo
- Publication number
- WO2009060420A1 WO2009060420A1 PCT/IB2008/054707 IB2008054707W WO2009060420A1 WO 2009060420 A1 WO2009060420 A1 WO 2009060420A1 IB 2008054707 W IB2008054707 W IB 2008054707W WO 2009060420 A1 WO2009060420 A1 WO 2009060420A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- loudspeaker
- recited
- cavity
- resonant frequency
- audible sound
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000004044 response Effects 0.000 claims abstract description 16
- 238000001228 spectrum Methods 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 101710097688 Probable sphingosine-1-phosphate lyase Proteins 0.000 description 4
- 101710105985 Sphingosine-1-phosphate lyase Proteins 0.000 description 4
- 101710122496 Sphingosine-1-phosphate lyase 1 Proteins 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 208000032041 Hearing impaired Diseases 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 230000002618 waking effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 241001669679 Eleotris Species 0.000 description 1
- 206010048865 Hypoacusis Diseases 0.000 description 1
- 241000269400 Sirenidae Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000016354 hearing loss disease Diseases 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000000263 scanning probe lithography Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
- H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
- H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers
Definitions
- This disclosure relates to an alert device and method and more particularly to a high efficiency loudspeaker alarm that is light weight, compact and low-cost with improved audibility.
- Typical fire alarms and in particular those for domestic use, are small devices designed to alert people in case of fire or other harmful conditions like smoke or high levels of carbon monoxide.
- Conventional designs include a cylindrical shaped alarm with a sensor and a speaker in the front face. The design is usually about 10-15 cm in thickness although this can vary with the design.
- An acoustical generator or speaker of these devices is usually a piezoelectric disk because it is compact and inexpensive.
- a typical acoustic response of a conventional fire alarm/smoke detector device is shown in FIG. 1.
- a normalized frequency spectrum is shown where sound pressure level (SPL in dB) is plotted against frequency (Hz). Note the peak response just greater than 3 kHz.
- SPL in dB sound pressure level
- Hz frequency
- the main frequency is usually around 3 kHz and is so high that it is easily damped by walls and doors. At this frequency the signal is not sufficiently audible for people who are sleeping. This problem is compounded if the fire alarm/smoke detector is not in a bedroom or the area where the individuals are sleeping, or if the fire alarm/smoke detector is located in a different floor in the house.
- the critical optimal frequencies are those within the same pitch range as the human voice (2500 Hz or less), although one study on the responsiveness of neonates during sleep [35] suggests lower frequencies (120-250 Hz) are optimal. People representing hard of hearing individuals advocate a tone between 100 and 700 Hz [36]."
- an alarm device which includes an improved response that is less attenuated then the conventional designs and provides a lightweight, compact design that is cost effective.
- the improved device may employ multi-tone signals, which can be radiated simultaneously and efficiently from a compact device.
- the conventional piezo disk sound generator is replaced with a small but very high efficiency loudspeaker.
- the small loudspeaker can be mounted in a tube and is capable of producing more than one tone at the same time.
- the loudspeaker is employed to render voice messages.
- An alert device and method include an elongated cavity and a loudspeaker coupled to a first end portion of the cavity wherein sound produced by the loudspeaker is directed through the cavity to provide an audible sound.
- the cavity and the loudspeaker are configured and dimensioned to provide the audible sound substantially at an anti-resonant frequency between first and second resonant frequency peaks for system impedance in a response spectrum for the loudspeaker and the cavity.
- a detector device includes a triggering device configured to trigger an alarm signal in accordance with a condition.
- An alert device includes a tube and a loudspeaker coupled to a first end portion of the tube wherein sound produced by the loudspeaker is directed through the tube to provide an audible sound, the tube and the loudspeaker are configured and dimensioned to provide the audible sound substantially at an anti-resonant frequency between first and second resonant frequency peaks for system impedance in a response spectrum for the loudspeaker and the tube.
- a controller is coupled to the triggering device and configured to activate the alert device in accordance with the alarm signal.
- a method for sounding an alarm includes providing an alert device including an elongated cavity and a loudspeaker coupled to a first end portion of the cavity wherein sound produced by the loudspeaker is directed through the cavity to provide an audible sound.
- the cavity and the loudspeaker are configured to provide the audible sound substantially at an anti-resonant frequency between first and second resonant frequency peaks for system impedance in a response spectrum for the loudspeaker and the cavity.
- the audible sound is generated by activating the loudspeaker.
- FIG. 1 is a diagram showing a frequency response spectrum for a conventional fire alarm piezo disk speaker
- FIG. 2 is a cross-sectional view of an alert/alarm device having a band-pass enclosure in accordance with one embodiment
- FIG. 3 is a cross-sectional view of an alert/alarm device having a reflex enclosure in accordance with another embodiment
- FIG. 4 is a cross-sectional view of an alert/alarm device which was prototyped and tested in accordance with one embodiment
- FIG. 5 is a plot of impedance versus frequency showing an anti-resonant frequency in accordance with one embodiment
- FIG. 6 is a plot of sound pressure level (dB) versus frequency for a fundamental harmonic for the device of FIG. 4;
- FIG. 7 is a schematic diagram showing a system for producing an alert/alarm in accordance with a triggering event;
- FIG. 8 is a flow diagram for a method for sounding an alarm in accordance with one embodiment.
- the present disclosure describes alert/alarm devices and in particular domestic use alarm devices for smoke detectors, fire alarms, burglar alarms or other alert systems. It should be understood that the present embodiments will be described in terms of compact alarm devices; however, the teachings of the present disclosure are much broader and are applicable to any components that can be employed for rendering acoustic waves. For example, for public address systems, car horns, sirens, etc. Embodiments described herein are preferably employed for domestic use as advantages are provided that reduce acoustic attenuation in domestic environments. However, as stated above, domestic use is illustrative of a single application. Other applications may include air horns, signaling devices or the like used in any environment.
- the alarm device may be fabricated from a plurality of different materials such as metal (e.g., steel, brass), wood, plastic or any other suitable material.
- metal e.g., steel, brass
- wood e.g., wood
- plastic is preferable for fabrication of a tube of the device since plastic is cost effective, easily molded to form and is environmentally resistant to decomposition.
- the illustrative example of the alarm device may be adapted to include electronic components, software modules and a plurality of different power sources. These components may be mounted in the alarm device or on other components.
- the electrical elements may be programmable and include a plurality of different sensor types. The elements depicted in the FIGS, may be implemented in various combinations and provide functions which may be combined in a single element or multiple elements.
- Device 100 includes a first chamber 104, which forms a bandpass enclosure configured to receive a loudspeaker 102.
- Loudspeaker 102 is preferably small enough to be mounted directly to an inside diameter of the first chamber 104.
- Chamber 104 may be separated into two volumes VO and Vl. Volume VO is bounded by sidewalls of the chamber 104, rear wall 108 and the loudspeaker 102 or an optional plate 110 on which the loudspeaker is mounted.
- the plate 110 may be employed to adapt to different loudspeakers 102 for placement inside chamber 104.
- Cavity 106 may include a tube or pipe and includes an internal cross-section of S p , which can be of any shape. Cavity 106 is L p in length.
- a device 200 includes a loudspeaker 202 mounted in a chamber 204. Chamber 204 forms a reflex enclosure with a long port or pipe 206. A separate volume VO is eliminated. Pipe or tube 206 includes an internal cross-section of S p , which can be of any shape. Cavity 206 is L p in length.
- one alternate embodiment may mount a loudspeaker/driver 302 in a tube 306 such that a diameter Dl of the driver 302 is smaller than a diameter Dp of the tube 306. In this case volume, Vi could be eliminated or minimized depending on the desired frequency response.
- the pipe 106, 206 or 306 may be any shaped elongated cavity.
- the chamber, loudspeaker and cavity are designed to have high efficiently, which is achieved since the cavity of the tube acts as an acoustical resonator.
- the system needs to have low damping (high Q, see, e.g., peak 502 in FIG. 6) which can be accomplished if the walls of the tube are smooth, and the tube is not too narrow, say, e.g., preferably larger than 2 cm in diameter or in thickness.
- parameters can be chosen to optimize performance.
- an electrical impedance of the loudspeaker at the working frequency Fb is about twice that of the impedance at Direct Current (DC).
- the electrical impedance at the working frequency is about twice the direct current impedance; however, in other embodiments the electrical impedance at a lowest working frequency is equal to the anti- resonant frequency that is between about 1 time and about 3.5 times a direct current impedance, and preferably between about 1.75 and about 2.25 times.
- a specified frequency f work is selected to substantially coincide with an anti-resonance frequency as shown as Fb.
- the anti-resonance frequency Fb is that frequency at which an electrical input impedance curve (Z( ⁇ )) reaches a local minimum between the first two impedance peaks 402 and 404 (seen from the left on the frequency scale).
- the impedance peaks 402 and 404 correspond to the natural or resonance frequencies of the system including chamber 104 (204) and tube 106 (206), or in FIG. 4, the natural frequency of the loudspeaker 302 and tube 306.
- the natural frequencies fl and f2 may be selected by selecting the loudspeaker (driver) properties and the dimensions of the chamber and pipe.
- Fb may then be selected or measured and employed as the operating frequency of the device.
- An advantage in selecting F b is that a low cost, compact and light weight alarm is realized with improved audibility for the hearing impaired, or for use in difficult conditions like high damping by walls. This is realized due at least to the operating frequency being lower than conventional devices.
- a loudspeaker such as those found in a radio or other devices, multiple tones can be achieved.
- the loudspeaker may provide more than one tone at the same time.
- a chamber, loudspeaker and elongated shaped cavity (106, 206 and/or 306 in FIGS. 2, 3, and 4, respectively) form a resonating system.
- the elongated shaped cavity may include a tube with a circular (oval or circle cross-section), a rectangular (e.g., a rectangular or square cross-section) or any other shaped cross-section.
- This structure preferably provides audible sound substantially at an anti-resonant frequency between first and second resonant frequency peaks (FIG. 5) of the system impedance.
- a 1st peak (502) of FIG. 6 coincides with the minimum between the peaks 402 and 404 of FIG. 5 (at frequency F b ).
- the vertical axis of FIG. 6 is SPL (dB) and that of FIG. 5 is the magnitude of the electrical impedance in ohms.
- Tube dimensions and loudspeaker size are preferably selected such that, at the anti- resonance frequency Fb, an electrical impedance of the system is twice that of the DC impedance, although other criteria may be employed.
- the frequency of the alarm tone can be changed such that it is optimally audible by a subject.
- the length of the tube or cavity (106, 206 or 306) may be adjusted such that the tuning criteria are fulfilled. This can be achieved by making, e.g., the tube telescopic (e.g., like a car antenna) such that the length can be optimized and adjusted.
- the anti-resonant frequency can be adjusted by adjusting the characteristics of the pipe or chamber.
- the tuning may be performed to increase the chance of hearing a particular tone. For example, if a user of a smoke alarm has impaired hearing the alarm may be adjusted to a frequency range that is particularly audible for that user.
- a small loudspeaker 302 is mounted onto/into a tube 306.
- Tube 306 may be bent or folded in any direction.
- An example of the acoustical response of a prototype is shown in FIG. 6.
- a diameter, D p , and length, L p , of the tube are respectively 3 cm and 15 cm, and a diameter of the loudspeaker is 2.4 cm.
- the following parameters were employed to perform tests.
- 1V-6V represent the loudspeaker power voltage, which is preferably DC power (e.g., from a battery). It should be noted that other power sources may be employed, such as AC power, and employ a transformer or provide power directly to the loudspeaker or its controlling circuitry.
- the highest voltage provides the highest SPL for all plots.
- the working frequency coincides with the peak 502 in FIG. 6, which is preferably less than 1000 Hz and in this example (e.g., the prototype) is about 550 Hz. In a preferred embodiment, more than one tone may be present at the same time.
- These tones preferably include frequencies coincident with the peaks of FIG. 6, in order to get high audibility and attention.
- resonant peaks 502, 504 and the peaks with higher frequencies in FIG. 6 (to the right of 504) would be coincident for two or more tones.
- the loudspeaker can be employed to render voice messages.
- the peaks in FIG. 6 are determined mainly by the loudspeaker enclosure (including the pipe), so it is better to adjust the tones such that the tones substantially remain below 1000 Hz.
- tones can be adjusted automatically by sensing the impedance of the system (measuring the current through the loudspeaker and the voltage across the loudspeaker) and tuning the frequency (by adjusting the cavity or the loudspeaker) so that a desired frequency or frequencies are obtained.
- a first tone may have at least peaks 502 and 504.
- the first tone may be employed with a second tone both with a frequency at the first peak (502) of FIG. 6, and a third tone may have a frequency at the 2nd peak (504) of FIG. 6.
- the tones are preferably present at the same time, they may alternate in order to get more attention.
- Alarm device 600 may be a smoke detector, a fire alarm, a carbon monoxide detector or any other device configured to sense a condition and provide an audible alert.
- Device 600 includes a power source 608, which may include a battery or other known power source(s). Power source 608 may be switched on by a switch 610 or other device to initiate operations (e.g., sensing conditions or activating loudspeaker (LS) 614).
- LS loudspeaker
- One or more sensors 604 are preferably provided to sense environment conditions to activate audible alarm device 620.
- Alarm device 620 may also be activated manually by activating a switch (e.g., switch 610) depending on the application or mode of operation.
- the device 600 is employed as a carbon monoxide detector, when carbon monoxide levels exceed a threshold (which may be stored in memory 606) as measured by a sensor 604 (a processor/controller 612 may perform the comparison), then alarm device 620 is activated by powering loudspeaker 614.
- a threshold which may be stored in memory 606
- a processor/controller 612 may perform the comparison
- alarm device 620 may be activated after a predetermined amount of time (e.g., alarm clock or class bell).
- the alarm device can be used for acoustical alarms and evacuation signals, or as a personal alarm, crime deterrent device (e.g., for ladies to carry the device in their bag, etc.) or integrated in a bicycle, car, or other platform (e.g., an alarm for a clock radio, personal digital assistance (PDA), telephone ring tone generator, etc.).
- PDA personal digital assistance
- Processor/controller 612 supplies power and signal to the alarm device 620.
- different tones, voices or combinations thereof may be provided to the loudspeaker 614.
- the system 600 can render coded messages by using different frequencies or combinations, e.g. one for smoke, one for CO, etc. Other alarm mechanisms may be employed as well, such as lights, for example.
- Alarm device includes a chamber 616 and tube 618 which have the characteristics as described above in accordance with the present principles. Chamber 616 may be reduced to a small volume as depicted in FIG. 4.
- the tube 618 preferably has small acoustical damping, and may be curved or bent in any direction to save space or to direct the sound in a particular direction.
- Tube 618 may include an adjustment mechanism 622 to adjust the audible tone output.
- Adjustment mechanism 622 may add mass to the system, constrict the cross-section of tube 618, add damping, and/or extend the length of the cavity 618 (e.g., telescoping). Adjustment may be performed manually using a mechanical device 624 such as a spring or screw driven against the tube 618, or the adjustment can be processor controlled based on user input or acoustic feedback from one of the sensors 604. Adjustment may also be made to the loudspeaker power or output to affect user fed back changes. For example, voltage and current measurements may be made on the loudspeaker to determine impedances and optimizing adjustments may be made.
- an alert device in block 702, includes an elongated cavity and a loudspeaker coupled to a first end portion of the cavity wherein sound produced by the loudspeaker is directed through the cavity to provide an audible sound.
- the cavity and the loudspeaker are configured to provide the audible sound substantially at an anti-resonant frequency between first and second resonant frequency peaks for system impedance in a response spectrum for the loudspeaker and the cavity.
- the audible sound may include at least one of a plurality of tones and voice messages.
- the plurality of tones may each include a fundamental frequency peak at a substantially same frequency.
- Configuring the cavity and the loudspeaker may also include configuring the chamber that houses the loudspeaker.
- An electrical impedance may provide a working frequency equal to the anti-resonant frequency that is between about 1 time and about 3.5 times a direct current impedance.
- Configuring the system may also include making adjustment to the chamber, cavity and loudspeaker to meet the impedance criteria or other criteria. This may include altering the characteristics of the system using, e.g., an adjustment mechanism (622) or employing feedback to adjust the acoustic response.
- the audible sound is generated by activating the loudspeaker.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010532697A JP2011508915A (en) | 2007-11-09 | 2008-11-10 | Warning device and method |
CN200880115239A CN101855913A (en) | 2007-11-09 | 2008-11-10 | Warning device and method |
EP08847612A EP2218266A1 (en) | 2007-11-09 | 2008-11-10 | Alert device and method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US98665307P | 2007-11-09 | 2007-11-09 | |
US60/986,653 | 2007-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009060420A1 true WO2009060420A1 (en) | 2009-05-14 |
Family
ID=40404813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2008/054707 WO2009060420A1 (en) | 2007-11-09 | 2008-11-10 | Alert device and method |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2218266A1 (en) |
JP (1) | JP2011508915A (en) |
KR (1) | KR20100121593A (en) |
CN (1) | CN101855913A (en) |
TW (1) | TW201019275A (en) |
WO (1) | WO2009060420A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102214381A (en) * | 2011-05-24 | 2011-10-12 | 重庆润创科技有限公司 | On-line monitoring method and microwave monitoring module of transformer |
WO2013048889A3 (en) * | 2011-09-28 | 2013-05-23 | Utc Fire & Security Corporation | Resonator for detectors and sounders |
US8810426B1 (en) | 2013-04-28 | 2014-08-19 | Gary Jay Morris | Life safety device with compact circumferential acoustic resonator |
US9179220B2 (en) | 2012-07-10 | 2015-11-03 | Google Inc. | Life safety device with folded resonant cavity for low frequency alarm tones |
TWI639982B (en) * | 2013-09-17 | 2018-11-01 | 微晶片科技公司 | A smoke detector with enhanced audio and communications capabilities |
TWI670692B (en) * | 2016-07-12 | 2019-09-01 | 日商Secual股份有限公司 | System and method for data collection and analysis and program therefor |
WO2024107266A1 (en) * | 2022-11-17 | 2024-05-23 | SimpliSafe, Inc. | Resonator devices and assemblies thereof |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9159218B2 (en) | 2013-09-17 | 2015-10-13 | Microchip Technology Incorporated | Initiation of carbon monoxide and/or smoke detector alarm test using image recognition and/or facial gesturing |
CN105096510A (en) * | 2015-06-30 | 2015-11-25 | 山东北仁汇智能源发展有限公司 | Senior-suitable smoke detector alarm method |
ES2632260B1 (en) * | 2016-03-09 | 2018-05-04 | Clarton Horn, S.A.U. | Control procedure of an acoustic warning, and acoustic warning performing said control procedure |
KR102559728B1 (en) * | 2022-02-21 | 2023-07-26 | 연세대학교 원주산학협력단 | Sound generator and sensor comprising minimum sound hole exposed to the outside |
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US20040028246A1 (en) * | 2002-03-28 | 2004-02-12 | Koji Maekawa | Speaker device |
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DK171338B1 (en) * | 1994-10-10 | 1996-09-09 | Brueel & Kjaer As | Circular sound source |
US6223853B1 (en) * | 1994-12-23 | 2001-05-01 | Graeme John Huon | Loudspeaker system incorporating acoustic waveguide filters and method of construction |
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2008
- 2008-11-10 WO PCT/IB2008/054707 patent/WO2009060420A1/en active Application Filing
- 2008-11-10 CN CN200880115239A patent/CN101855913A/en active Pending
- 2008-11-10 EP EP08847612A patent/EP2218266A1/en not_active Withdrawn
- 2008-11-10 JP JP2010532697A patent/JP2011508915A/en active Pending
- 2008-11-10 KR KR1020107012605A patent/KR20100121593A/en not_active Application Discontinuation
- 2008-11-12 TW TW97143773A patent/TW201019275A/en unknown
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GB2310559A (en) * | 1996-02-23 | 1997-08-27 | Nokia Mobile Phones Ltd | Loudspeaker housing arrangements |
US20040028246A1 (en) * | 2002-03-28 | 2004-02-12 | Koji Maekawa | Speaker device |
WO2006043215A1 (en) * | 2004-10-19 | 2006-04-27 | Koninklijke Philips Electronics N.V. | Vented loudspeaker box system and its control method |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102214381A (en) * | 2011-05-24 | 2011-10-12 | 重庆润创科技有限公司 | On-line monitoring method and microwave monitoring module of transformer |
WO2013048889A3 (en) * | 2011-09-28 | 2013-05-23 | Utc Fire & Security Corporation | Resonator for detectors and sounders |
US9179220B2 (en) | 2012-07-10 | 2015-11-03 | Google Inc. | Life safety device with folded resonant cavity for low frequency alarm tones |
US9792794B2 (en) | 2012-07-10 | 2017-10-17 | Google Inc. | Life safety device having high acoustic efficiency |
US8810426B1 (en) | 2013-04-28 | 2014-08-19 | Gary Jay Morris | Life safety device with compact circumferential acoustic resonator |
US9489807B2 (en) | 2013-04-28 | 2016-11-08 | Google Inc. | Life safety device with compact circumferential acoustic resonator |
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TWI639982B (en) * | 2013-09-17 | 2018-11-01 | 微晶片科技公司 | A smoke detector with enhanced audio and communications capabilities |
TWI670692B (en) * | 2016-07-12 | 2019-09-01 | 日商Secual股份有限公司 | System and method for data collection and analysis and program therefor |
WO2024107266A1 (en) * | 2022-11-17 | 2024-05-23 | SimpliSafe, Inc. | Resonator devices and assemblies thereof |
Also Published As
Publication number | Publication date |
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JP2011508915A (en) | 2011-03-17 |
TW201019275A (en) | 2010-05-16 |
KR20100121593A (en) | 2010-11-18 |
CN101855913A (en) | 2010-10-06 |
EP2218266A1 (en) | 2010-08-18 |
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