EP3223541A1 - An outdoor multi-microphone system with an integrated remote acoustic calibration - Google Patents
An outdoor multi-microphone system with an integrated remote acoustic calibration Download PDFInfo
- Publication number
- EP3223541A1 EP3223541A1 EP16461510.6A EP16461510A EP3223541A1 EP 3223541 A1 EP3223541 A1 EP 3223541A1 EP 16461510 A EP16461510 A EP 16461510A EP 3223541 A1 EP3223541 A1 EP 3223541A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microphone
- loudspeaker
- assembly
- measurement
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- GGMPTLAAIUQMIE-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobiphenyl Chemical compound ClC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1C1=CC=CC=C1 GGMPTLAAIUQMIE-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 2
- ZDDZPDTVCZLFFC-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(4-chlorophenyl)benzene Chemical compound C1=CC(Cl)=CC=C1C1=C(Cl)C(Cl)=CC(Cl)=C1Cl ZDDZPDTVCZLFFC-UHFFFAOYSA-N 0.000 description 1
- IUTPYMGCWINGEY-UHFFFAOYSA-N 2,3',4,4',5-Pentachlorobiphenyl Chemical compound C1=C(Cl)C(Cl)=CC=C1C1=CC(Cl)=C(Cl)C=C1Cl IUTPYMGCWINGEY-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
-
- 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
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
-
- 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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
Definitions
- the present invention relates to remote calibration of outdoor microphones.
- Outdoor noise monitoring systems are used for long-term measurements of noise, e.g. at roads, airports etc. It is essential to perform periodic calibration of these systems in order to guarantee their correct operation. It is preferred if the calibration can be performed remotely, without a need for an operator to perform manual procedures at the microphone. One of the calibration procedures is to check whether the station is operable.
- a condenser microphone can be calibrated by means of an electrostatic actuator that comprises an electrode that permits the application of an electrostatic force to the metallic or metalized diaphragm of the microphone in order to perform the calibration.
- the equivalent capacitance of the microphone can be measured. It is relatively hard to perform acoustic calibration by performing comparison of sound levels received by the measured microphone and a reference microphone, as the condenser microphones are relatively large and the reference microphone would occupy too much space in the measurement system housing, which must meet strict acoustic requirements.
- a US patent application US20140369511 discloses a self calibrating dipole microphone formed from two omni-directional acoustic sensors.
- the microphone includes a sound source acoustically coupled to the acoustic sensors and a processor.
- the sound source is excited with a test signal, exposing the acoustic sensors to acoustic calibration signals, which are of the same phase.
- the responses of the acoustic sensors to the calibration signals are compared by the processor and a correction transfer function is determined.
- the system is designed in particular for a dipole microphone.
- MEMS microphones have been recently developed and find more and more applications of use. So far, little research has been conducted on the possibilities of use of the MEMS microphones for outdoor monitoring systems.
- MEMS microphones have very small dimensions, which allows designing a multi-microphone system having a standard dimensions used in acoustic fields (for example, a 1/2" or 1" diameter).
- the MEMS microphones have no equivalent capacitance that could be measured, as in the case of condenser microphones and they cannot be excited by an electrostatic actuator.
- the object of the invention is an outdoor microphone comprising:
- the outdoor microphone may comprise a pair or more of measurement microphones and a pair or more of reference microphones.
- the reference microphones may have a different characteristics (e.g. a narrower measuring band) than the measurement microphones.
- the outdoor microphone may further comprise: an amplifier controlled by a microprocessor; wherein the amplifier is configured to generate the loudspeaker driving signal; and wherein the microprocessor is configured to detect a difference between the signal level measured by the measurement microphone and the reference microphone and to generate a positive system check result signal if the difference is below a threshold and a negative system check result signal otherwise.
- the outdoor microphone system is shown in Figs. 1A and 1B . It comprises a housing 100 formed of a plurality of elements 101, 102, some of which are detachably joined with each other.
- the housing is cylindrical, and has preferably a 1/2" diameter.
- the first housing element 101 is configured to accommodate and seal a microphone assembly 110 and to allow ambient sound to reach the microphone assembly via openings 1011.
- the first housing element may be surrounded by a protective windscreen (not shown in the drawing).
- the second housing element 102 accommodates a loudspeaker assembly 120.
- the microphone assembly 110 is powered in a conventional manner, for example via a signal wire (not shown in the drawing) connected to a battery, and the ground terminal connected to the housing, which is preferably made of a conducting metal.
- the loudspeaker assembly 120 is electrically connected with the microphone assembly via a central springy connector 131 (in form of an elastic pin) for conducting signal to the loudspeaker, and the loudspeaker assembly 120 can be connected to the grounded housing element 102.
- the microphone assembly 110 is accommodated in a housing 111 with openings 112 that act as inlets for sound to the microphones and the springy connector 131.
- the microphone assembly as shown in details in Figs. 2A and 2B in slanted view and in Figs. 2C and 2D in cross-sections along two planes perpendicular to each other, comprises in this example embodiment a pair of measurement microphones 114 and a pair of reference microphones 115. In other embodiments, more than two measuring or reference microphones can be used.
- the microphones are preferably MEMS microphones. A pair of microphones with summed outputs connected in parallel is more preferred than a single microphone, in particular for MEMS microphones which have relatively high self noise, to improve the signal to noise ratio.
- PCBs printed circuit boards
- the PCB 116 has openings 1161 as inlets for sound to the microphones (which are mounted at the side opposite to the side facing the cavity of the first housing element 101) and a terminal 113 for contacting the springy connector 131.
- the openings 1171 are made in guiding sleeves 1172 between the first PCB 116 and the second PCB 117.
- the measurement microphones 114 may be of the same or different type as the reference microphones 115.
- the reference microphones are smaller, as they have a narrower measurement band (which is enough to cover the frequency of the loudspeaker used for calibration - typically 1 kHz).
- the reference microphone(s) do not need to be located on the same surface as the measurement microphones, as the loudspeaker acoustic signal RMS value is a subject of verification. This also expands the space for the location of the measurement microphones.
- microphone assembly 110 Other elements of the microphone assembly 110, such as electronic circuits 121-126 for data processing and transmission, can be accommodated on a third PCB 118.
- the loudspeaker assembly comprises a printed circuit board 132 that has openings 1321 that act as outlets for sound from the loudspeaker and connects the springy connector 131 with a wire 133 that conducts signal to a loudspeaker 135.
- the openings 1321 are covered by an insulating pad 134 that provides insulation from water from the cavity within the first housing element 101.
- the loudspeaker 135 is directed towards the sound outlet openings 1321.
- the acoustic calibration system operates as follows.
- the loudspeaker is induced, via a signal passed through the central connector 131, to emit sound that passes via the openings 1311, to the cavity within the first housing element 101. Therefore, the acoustic coupling between the loudspeaker assembly 120 and the microphone assembly 110 is open.
- the calibration sound that reaches the cavity within the first housing element 101 can be then measured by the microphone assembly 110 in a manner equivalent to the measurement of the outdoor noise. Therefore, the microphone assembly is acoustically excited.
- the loudspeaker 135 emits sound of a known level stabilized by the feedback loop including the reference microphone 115. This level should be as high as possible to increase the excitation signal as much as possible above of the ambient noise.
- levels up to 110 dB are provided. It is then checked whether the level of the signal received by the measurement microphone(s) is within the expected level range. If so, it suggests that the microphone(s) are operative. In case the measured signal deviation from the expected value is too big, i.e. it exceeds a predefined deviation threshold, it suggests that the microphone(s) is(are) defective.
- the results of the system check can be then transmitted to a remote station to inform the operator of the outdoor monitoring system whether the particular outdoor monitoring station is operative or malfunctioning. For example, the calibration procedure (system check) can be performed once a day.
- FIG. 3 A functional schematic of the calibration system is shown in Fig. 3 .
- ambient sound level received by the reference microphone 115 is measured, converted to a digital signal by an A/D converter 123 and input to a microprocessor 126.
- an amplifier 124 in response to a signal from the processor 126 and a D/A converter 125, sets the level of the signal driving the loudspeaker 135 via the connector 131 to a high level, for example to a maximum level.
- the sound level emitted by the loudspeaker 135 should be higher than the ambient sound level, e.g.
- the microprocessor 126 compares the sound level measured by the reference microphone 115 and the measurement microphones 114.
- the measurement microphone signals can be input to the microprocessor 126 via a 3 to N cycles commutator 122 or another configuration.
- a negative system check result is output by the microprocessor 126.
- a positive system check result is output.
- the system has a plurality of advantages.
- the use of MEMS microphones allows to accommodate the system comprising a plurality of microphones (including a reference microphone and measurement microphone) in relatively small housing, for example a cylindrical housing of a 1/2" diameter.
- the central springy connector pin allows the housing 102 of the loudspeaker assembly to be conveniently mounted with the other element 101 of the housing, with no wires running outside the housing, which improves the acoustic performances and robustness of the system. Integration of the loudspeaker with the microphone assembly in a single housing 100 allows the outdoor microphone to be calibrated remotely, system check). (The MEMS microphones are induced acoustically by the loudspeaker.
- Absolute calibration by external acoustic calibrator is also very simple jus by disconnecting upper part of the housing (including loudspeaker and springy contact) and attaching calibrator directed on microphone housing.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Circuit For Audible Band Transducer (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
- The present invention relates to remote calibration of outdoor microphones.
- Outdoor noise monitoring systems are used for long-term measurements of noise, e.g. at roads, airports etc. It is essential to perform periodic calibration of these systems in order to guarantee their correct operation. It is preferred if the calibration can be performed remotely, without a need for an operator to perform manual procedures at the microphone. One of the calibration procedures is to check whether the station is operable.
- So far, outdoor noise monitoring stations used condenser microphones. A condenser microphone can be calibrated by means of an electrostatic actuator that comprises an electrode that permits the application of an electrostatic force to the metallic or metalized diaphragm of the microphone in order to perform the calibration. Alternatively, the equivalent capacitance of the microphone can be measured. It is relatively hard to perform acoustic calibration by performing comparison of sound levels received by the measured microphone and a reference microphone, as the condenser microphones are relatively large and the reference microphone would occupy too much space in the measurement system housing, which must meet strict acoustic requirements.
- A US patent application
US20140369511 discloses a self calibrating dipole microphone formed from two omni-directional acoustic sensors. The microphone includes a sound source acoustically coupled to the acoustic sensors and a processor. The sound source is excited with a test signal, exposing the acoustic sensors to acoustic calibration signals, which are of the same phase. The responses of the acoustic sensors to the calibration signals are compared by the processor and a correction transfer function is determined. The system is designed in particular for a dipole microphone. - MEMS microphones have been recently developed and find more and more applications of use. So far, little research has been conducted on the possibilities of use of the MEMS microphones for outdoor monitoring systems.
- MEMS microphones have very small dimensions, which allows designing a multi-microphone system having a standard dimensions used in acoustic fields (for example, a 1/2" or 1" diameter).
- Providing a proper symmetrical design of the outdoor microphone is very important to meet acoustical characteristics requirements defined in the IEC 61672:2013 for Class 1 or Class 2, typically required for such measurement systems.
- Additionally, such multi-microphone solution offers improved system signal to noise ratio expanding the lower measuring range of the outdoor microphone.
- The MEMS microphones have no equivalent capacitance that could be measured, as in the case of condenser microphones and they cannot be excited by an electrostatic actuator.
- There is therefore a need to provide an alternative design for an outdoor microphone with an integrated calibration system that will solve the problems mentioned above and allow remote calibration of the microphone.
- The object of the invention is an outdoor microphone comprising:
- a microphone assembly mounted in a first housing element and comprising: at least one MEMS microphone configured as a measurement microphone; at least one MEMS microphone configured as a reference microphone; an amplifier for generating a loudspeaker driving signal; a microprocessor configured to compare the signal level measured by the measurement microphone and the reference microphone and converted by a dual-channel A//D converter;
- a loudspeaker assembly mounted in a second housing element connected with the first housing element and comprising a loudspeaker for generating sound;
- a springy connector installed inside the outdoor microphone housing elements for connecting the loudspeaker assembly with the microphone assembly to conduct the loudspeaker driving signal;
- wherein the first housing element has openings surrounding an open sound cavity for passing ambient sound from the environment and the sound from the loudspeaker assembly located at one end of the cavity to the microphone assembly located at the other end of the cavity.
- The outdoor microphone may comprise a pair or more of measurement microphones and a pair or more of reference microphones.
- The reference microphones may have a different characteristics (e.g. a narrower measuring band) than the measurement microphones.
- The outdoor microphone may further comprise: an amplifier controlled by a microprocessor; wherein the amplifier is configured to generate the loudspeaker driving signal; and wherein the microprocessor is configured to detect a difference between the signal level measured by the measurement microphone and the reference microphone and to generate a positive system check result signal if the difference is below a threshold and a negative system check result signal otherwise.
- The outdoor microphone with integrated remote acoustic calibration system and a method for remote acoustic calibration are shown by means of example embodiments on a drawing, in which:
-
Figs. 1A and1B show an outdoor microphone system in an isometric view (with some elements shown as transparent) and a cross-sectional view; -
Figs. 2A and 2B show the microphone assembly in an isometric view (outside the housing) and a cross-sectional view (inside the housing). -
Fig. 3 shows a functional schematic of the calibration system. - The outdoor microphone system is shown in
Figs. 1A and1B . It comprises ahousing 100 formed of a plurality ofelements first housing element 101 is configured to accommodate and seal amicrophone assembly 110 and to allow ambient sound to reach the microphone assembly viaopenings 1011. The first housing element may be surrounded by a protective windscreen (not shown in the drawing). Thesecond housing element 102 accommodates aloudspeaker assembly 120. - The
microphone assembly 110 is powered in a conventional manner, for example via a signal wire (not shown in the drawing) connected to a battery, and the ground terminal connected to the housing, which is preferably made of a conducting metal. Theloudspeaker assembly 120 is electrically connected with the microphone assembly via a central springy connector 131 (in form of an elastic pin) for conducting signal to the loudspeaker, and theloudspeaker assembly 120 can be connected to thegrounded housing element 102. - The
microphone assembly 110 is accommodated in ahousing 111 withopenings 112 that act as inlets for sound to the microphones and thespringy connector 131. - The microphone assembly, as shown in details in
Figs. 2A and 2B in slanted view and inFigs. 2C and 2D in cross-sections along two planes perpendicular to each other, comprises in this example embodiment a pair ofmeasurement microphones 114 and a pair ofreference microphones 115. In other embodiments, more than two measuring or reference microphones can be used. The microphones are preferably MEMS microphones. A pair of microphones with summed outputs connected in parallel is more preferred than a single microphone, in particular for MEMS microphones which have relatively high self noise, to improve the signal to noise ratio. They are mounted to printed circuit boards (PCBs) 116, 117 with their membranes directed towards the PCB, whereinopenings first housing element 101. The PCB 116 hasopenings 1161 as inlets for sound to the microphones (which are mounted at the side opposite to the side facing the cavity of the first housing element 101) and a terminal 113 for contacting thespringy connector 131. Theopenings 1171 are made in guidingsleeves 1172 between thefirst PCB 116 and thesecond PCB 117. - The
measurement microphones 114 may be of the same or different type as thereference microphones 115. In this example, the reference microphones are smaller, as they have a narrower measurement band (which is enough to cover the frequency of the loudspeaker used for calibration - typically 1 kHz). The reference microphone(s) do not need to be located on the same surface as the measurement microphones, as the loudspeaker acoustic signal RMS value is a subject of verification. This also expands the space for the location of the measurement microphones. - Other elements of the
microphone assembly 110, such as electronic circuits 121-126 for data processing and transmission, can be accommodated on athird PCB 118. - The loudspeaker assembly comprises a printed
circuit board 132 that hasopenings 1321 that act as outlets for sound from the loudspeaker and connects thespringy connector 131 with awire 133 that conducts signal to aloudspeaker 135. Theopenings 1321 are covered by an insulatingpad 134 that provides insulation from water from the cavity within thefirst housing element 101. Theloudspeaker 135 is directed towards thesound outlet openings 1321. - The acoustic calibration system operates as follows. The loudspeaker is induced, via a signal passed through the
central connector 131, to emit sound that passes via the openings 1311, to the cavity within thefirst housing element 101. Therefore, the acoustic coupling between theloudspeaker assembly 120 and themicrophone assembly 110 is open. The calibration sound that reaches the cavity within thefirst housing element 101 can be then measured by themicrophone assembly 110 in a manner equivalent to the measurement of the outdoor noise. Therefore, the microphone assembly is acoustically excited. Theloudspeaker 135 emits sound of a known level stabilized by the feedback loop including thereference microphone 115. This level should be as high as possible to increase the excitation signal as much as possible above of the ambient noise. With the described solution, levels up to 110 dB are provided. It is then checked whether the level of the signal received by the measurement microphone(s) is within the expected level range. If so, it suggests that the microphone(s) are operative. In case the measured signal deviation from the expected value is too big, i.e. it exceeds a predefined deviation threshold, it suggests that the microphone(s) is(are) defective. The results of the system check can be then transmitted to a remote station to inform the operator of the outdoor monitoring system whether the particular outdoor monitoring station is operative or malfunctioning. For example, the calibration procedure (system check) can be performed once a day. - A functional schematic of the calibration system is shown in
Fig. 3 . First, ambient sound level received by thereference microphone 115 is measured, converted to a digital signal by an A/D converter 123 and input to amicroprocessor 126. Next, anamplifier 124, in response to a signal from theprocessor 126 and a D/A converter 125, sets the level of the signal driving theloudspeaker 135 via theconnector 131 to a high level, for example to a maximum level. The sound level emitted by theloudspeaker 135 should be higher than the ambient sound level, e.g. by 20 dB, which is in some situations not possible, for example when the ambient sound level is high at the moment of performing the calibration - in such situations, the calibration procedure can be stopped and repeated after some time. Next, themicroprocessor 126 compares the sound level measured by thereference microphone 115 and themeasurement microphones 114. The measurement microphone signals can be input to themicroprocessor 126 via a 3 to N cycles commutator 122 or another configuration. In case the levels measured by thereference microphone 115 and themeasurement microphones 114 differ by more than a particular threshold, e.g. 2dB, a negative system check result is output by themicroprocessor 126. In case the level difference is within the threshold, a positive system check result is output. - The system has a plurality of advantages. The use of MEMS microphones allows to accommodate the system comprising a plurality of microphones (including a reference microphone and measurement microphone) in relatively small housing, for example a cylindrical housing of a 1/2" diameter. The central springy connector pin allows the
housing 102 of the loudspeaker assembly to be conveniently mounted with theother element 101 of the housing, with no wires running outside the housing, which improves the acoustic performances and robustness of the system. Integration of the loudspeaker with the microphone assembly in asingle housing 100 allows the outdoor microphone to be calibrated remotely, system check). (The MEMS microphones are induced acoustically by the loudspeaker. - Absolute calibration by external acoustic calibrator is also very simple jus by disconnecting upper part of the housing (including loudspeaker and springy contact) and attaching calibrator directed on microphone housing.
Claims (4)
- An outdoor microphone comprising:- a microphone assembly (110) mounted in a first housing element (101) and comprising:- at least one MEMS microphone configured as a measurement microphone (114);- at least one MEMS microphone configured as a reference microphone (115);- an amplifier (124) for generating a loudspeaker driving signal;- a microprocessor (126) configured to compare the signal level measured by the measurement microphone (114) and the reference microphone (115) and converted by a dual-channel A//D converter (123);- a loudspeaker assembly (120) mounted in a second housing element (102) connected with the first housing element (101) and comprising a loudspeaker (135) for generating sound;- a springy connector (131) installed inside the outdoor microphone housing elements (101, 102) for connecting the loudspeaker assembly (120) with the microphone assembly (110) to conduct the loudspeaker driving signal;- wherein the first housing element (101) has openings (1011) surrounding an open sound cavity for passing ambient sound from the environment and the sound from the loudspeaker assembly (120) located at one end of the cavity to the microphone assembly (110) located at the other end of the cavity.
- The microphone according to claim 1, comprising a pair or more of measurement microphones (114) and a pair or more of reference microphones (115).
- The microphone according to claim 2, wherein the reference microphones (115) have a different characteristics, preferably a narrower measurement band, than the measurement microphones (114).
- The microphone according to any of previous claims, further comprising:- an amplifier (124) controlled by a microprocessor (126);- wherein the amplifier (124) is configured to generate the loudspeaker driving signal;- and wherein the microprocessor (126) is configured to detect a difference between the signal level measured by the measurement microphone (114) and the reference microphone (115) and to generate a positive system check result signal if the difference is below a threshold and a negative system check result signal otherwise.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES16461510T ES2721500T3 (en) | 2016-03-21 | 2016-03-21 | Multi external microphone system with integrated remote acoustic calibration |
EP16461510.6A EP3223541B1 (en) | 2016-03-21 | 2016-03-21 | An outdoor multi-microphone system with an integrated remote acoustic calibration |
PL16461510T PL3223541T3 (en) | 2016-03-21 | 2016-03-21 | An outdoor multi-microphone system with an integrated remote acoustic calibration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16461510.6A EP3223541B1 (en) | 2016-03-21 | 2016-03-21 | An outdoor multi-microphone system with an integrated remote acoustic calibration |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3223541A1 true EP3223541A1 (en) | 2017-09-27 |
EP3223541B1 EP3223541B1 (en) | 2019-02-06 |
Family
ID=55587228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16461510.6A Active EP3223541B1 (en) | 2016-03-21 | 2016-03-21 | An outdoor multi-microphone system with an integrated remote acoustic calibration |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3223541B1 (en) |
ES (1) | ES2721500T3 (en) |
PL (1) | PL3223541T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108737947A (en) * | 2018-08-27 | 2018-11-02 | 湖南声仪测控科技有限责任公司 | A kind of acoustic calibrator using mems microphones |
EP3544318A1 (en) | 2018-03-20 | 2019-09-25 | SVANTEK Sp. z o.o. | Remote checking of microphone condition in a noise monitoring system |
CN110784815A (en) * | 2019-11-05 | 2020-02-11 | 苏州市精创测控技术有限公司 | Device and method for testing acoustic performance of product |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1069129A (en) * | 1964-07-02 | 1967-05-17 | Rohde & Schwarz | Flight noise monitoring equipment |
JP2010085110A (en) * | 2008-09-29 | 2010-04-15 | Kensetsu Kankyo Kenkyusho:Kk | Noise meter and noise measurement program |
US20140369511A1 (en) | 2011-04-20 | 2014-12-18 | Vocollect, Inc. | Self calibrating multi-element dipole microphone |
EP2869598A1 (en) * | 2013-10-30 | 2015-05-06 | SVANTEK Sp. z o.o. | A device for measuring sound level |
-
2016
- 2016-03-21 ES ES16461510T patent/ES2721500T3/en active Active
- 2016-03-21 PL PL16461510T patent/PL3223541T3/en unknown
- 2016-03-21 EP EP16461510.6A patent/EP3223541B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1069129A (en) * | 1964-07-02 | 1967-05-17 | Rohde & Schwarz | Flight noise monitoring equipment |
JP2010085110A (en) * | 2008-09-29 | 2010-04-15 | Kensetsu Kankyo Kenkyusho:Kk | Noise meter and noise measurement program |
US20140369511A1 (en) | 2011-04-20 | 2014-12-18 | Vocollect, Inc. | Self calibrating multi-element dipole microphone |
EP2869598A1 (en) * | 2013-10-30 | 2015-05-06 | SVANTEK Sp. z o.o. | A device for measuring sound level |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3544318A1 (en) | 2018-03-20 | 2019-09-25 | SVANTEK Sp. z o.o. | Remote checking of microphone condition in a noise monitoring system |
US10455341B2 (en) | 2018-03-20 | 2019-10-22 | Svantek Sp. Z.O.O. | Remote checking of microphone condition in a noise monitoring system |
CN108737947A (en) * | 2018-08-27 | 2018-11-02 | 湖南声仪测控科技有限责任公司 | A kind of acoustic calibrator using mems microphones |
CN110784815A (en) * | 2019-11-05 | 2020-02-11 | 苏州市精创测控技术有限公司 | Device and method for testing acoustic performance of product |
CN110784815B (en) * | 2019-11-05 | 2021-02-12 | 苏州市精创测控技术有限公司 | Device and method for testing acoustic performance of product |
Also Published As
Publication number | Publication date |
---|---|
ES2721500T3 (en) | 2019-08-01 |
EP3223541B1 (en) | 2019-02-06 |
PL3223541T3 (en) | 2019-07-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
USRE47048E1 (en) | Flow meter with ultrasound transducer directly connected to and fixed to measurement circuit board | |
US20180302732A1 (en) | Ported headphones and related methods | |
EP3223541B1 (en) | An outdoor multi-microphone system with an integrated remote acoustic calibration | |
US10455341B2 (en) | Remote checking of microphone condition in a noise monitoring system | |
JP5409430B2 (en) | Gooseneck condenser microphone | |
US9510120B2 (en) | Apparatus and method for testing sound transducers | |
EP1569498A2 (en) | Parallelepiped condenser microphone | |
US20210092509A1 (en) | Sound transducer unit for generating and/or detecting sound waves in the audible wavelength spectrum and/or in the ultrasonic range | |
EP2767979A1 (en) | Voice input device and noise suppression method | |
US11104571B2 (en) | Microphone with integrated gas sensor | |
WO2008062849A1 (en) | Integrated circuit device, voice input device and information processing system | |
JP6676258B2 (en) | Calibration method of measurement data in body sound measurement system | |
EP2490462A1 (en) | Condenser microphone assembly with floating configuration | |
JPH01293000A (en) | Electro-acoustic converter | |
WO2019133645A1 (en) | Reconfigurable microphone assembly | |
KR101742964B1 (en) | Uultrasonic sensor unit | |
JP2004007427A (en) | Electrostatic microphone transducer | |
JP6716107B2 (en) | Measuring probe | |
JP6721467B2 (en) | Microphone | |
JP2015162397A (en) | Radio communication device | |
KR20240078108A (en) | Active coupler for microphones | |
US11277701B2 (en) | Microphone | |
KR100537435B1 (en) | Directional condenser microphone | |
US10939192B2 (en) | Electret condenser microphone and manufacturing method thereof | |
JP2016163284A (en) | Microphone, and housing for microphone |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180327 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H04R 29/00 20060101AFI20180716BHEP Ipc: G10K 11/00 20060101ALI20180716BHEP Ipc: H04R 1/08 20060101ALN20180716BHEP |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20181009 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: AT Ref legal event code: REF Ref document number: 1095621 Country of ref document: AT Kind code of ref document: T Effective date: 20190215 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602016009817 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: PATENTANWALTSKANZLEI NUECKEL, CH |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190606 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190506 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2721500 Country of ref document: ES Kind code of ref document: T3 Effective date: 20190801 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1095621 Country of ref document: AT Kind code of ref document: T Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190507 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190506 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190606 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602016009817 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190321 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20190331 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
26N | No opposition filed |
Effective date: 20191107 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190321 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190331 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190321 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20160321 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190206 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20240327 Year of fee payment: 9 Ref country code: GB Payment date: 20240327 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: PL Payment date: 20240227 Year of fee payment: 9 Ref country code: FR Payment date: 20240325 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20240402 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20240401 Year of fee payment: 9 |