EP3223541A1 - Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung - Google Patents

Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung Download PDF

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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
Application number
EP16461510.6A
Other languages
English (en)
French (fr)
Other versions
EP3223541B1 (de
Inventor
Wieslaw Barwicz
Rafal Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SVANTEK SP Z OO
SVANTEK SP Z O O
Original Assignee
SVANTEK SP Z OO
SVANTEK SP Z O O
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Filing date
Publication date
Application filed by SVANTEK SP Z OO, SVANTEK SP Z O O filed Critical SVANTEK SP Z OO
Priority to ES16461510T priority Critical patent/ES2721500T3/es
Priority to EP16461510.6A priority patent/EP3223541B1/de
Priority to PL16461510T priority patent/PL3223541T3/pl
Publication of EP3223541A1 publication Critical patent/EP3223541A1/de
Application granted granted Critical
Publication of EP3223541B1 publication Critical patent/EP3223541B1/de
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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.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP16461510.6A 2016-03-21 2016-03-21 Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung Active EP3223541B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES16461510T ES2721500T3 (es) 2016-03-21 2016-03-21 Sistema de varios micrófonos exteriores con una calibración acústica a distancia integrada
EP16461510.6A EP3223541B1 (de) 2016-03-21 2016-03-21 Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung
PL16461510T PL3223541T3 (pl) 2016-03-21 2016-03-21 Zewnętrzny system wielomikrofonowy ze zintegrowaną zdalną kalibracją akustyczną

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16461510.6A EP3223541B1 (de) 2016-03-21 2016-03-21 Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung

Publications (2)

Publication Number Publication Date
EP3223541A1 true EP3223541A1 (de) 2017-09-27
EP3223541B1 EP3223541B1 (de) 2019-02-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16461510.6A Active EP3223541B1 (de) 2016-03-21 2016-03-21 Multimikrofonsystem für draussen mit integrierter akustikfernkalibrierung

Country Status (3)

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EP (1) EP3223541B1 (de)
ES (1) ES2721500T3 (de)
PL (1) PL3223541T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108737947A (zh) * 2018-08-27 2018-11-02 湖南声仪测控科技有限责任公司 一种应用mems麦克风的声校准器
EP3544318A1 (de) 2018-03-20 2019-09-25 SVANTEK Sp. z o.o. Fernüberprüfung der mikrofonbedingung in einem geräuschüberwachungssystem
CN110784815A (zh) * 2019-11-05 2020-02-11 苏州市精创测控技术有限公司 一种用于测试产品声学性能的装置及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069129A (en) * 1964-07-02 1967-05-17 Rohde & Schwarz Flight noise monitoring equipment
JP2010085110A (ja) * 2008-09-29 2010-04-15 Kensetsu Kankyo Kenkyusho:Kk 騒音計、および騒音計測用プログラム
US20140369511A1 (en) 2011-04-20 2014-12-18 Vocollect, Inc. Self calibrating multi-element dipole microphone
EP2869598A1 (de) * 2013-10-30 2015-05-06 SVANTEK Sp. z o.o. Vorrichtung zur Messung des Schallpegels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069129A (en) * 1964-07-02 1967-05-17 Rohde & Schwarz Flight noise monitoring equipment
JP2010085110A (ja) * 2008-09-29 2010-04-15 Kensetsu Kankyo Kenkyusho:Kk 騒音計、および騒音計測用プログラム
US20140369511A1 (en) 2011-04-20 2014-12-18 Vocollect, Inc. Self calibrating multi-element dipole microphone
EP2869598A1 (de) * 2013-10-30 2015-05-06 SVANTEK Sp. z o.o. Vorrichtung zur Messung des Schallpegels

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3544318A1 (de) 2018-03-20 2019-09-25 SVANTEK Sp. z o.o. Fernüberprüfung der mikrofonbedingung in einem geräuschüberwachungssystem
US10455341B2 (en) 2018-03-20 2019-10-22 Svantek Sp. Z.O.O. Remote checking of microphone condition in a noise monitoring system
CN108737947A (zh) * 2018-08-27 2018-11-02 湖南声仪测控科技有限责任公司 一种应用mems麦克风的声校准器
CN110784815A (zh) * 2019-11-05 2020-02-11 苏州市精创测控技术有限公司 一种用于测试产品声学性能的装置及方法
CN110784815B (zh) * 2019-11-05 2021-02-12 苏州市精创测控技术有限公司 一种用于测试产品声学性能的装置及方法

Also Published As

Publication number Publication date
PL3223541T3 (pl) 2019-07-31
EP3223541B1 (de) 2019-02-06
ES2721500T3 (es) 2019-08-01

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