SE2130292A1 - An acoustic sensor - Google Patents

An acoustic sensor

Info

Publication number
SE2130292A1
SE2130292A1 SE2130292A SE2130292A SE2130292A1 SE 2130292 A1 SE2130292 A1 SE 2130292A1 SE 2130292 A SE2130292 A SE 2130292A SE 2130292 A SE2130292 A SE 2130292A SE 2130292 A1 SE2130292 A1 SE 2130292A1
Authority
SE
Sweden
Prior art keywords
order
acoustic sensor
band pass
khz
cutoff frequency
Prior art date
Application number
SE2130292A
Inventor
Bror-Reidar Wijgård
Original Assignee
Sensorbee AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sensorbee AB filed Critical Sensorbee AB
Priority to SE2130292A priority Critical patent/SE2130292A1/en
Publication of SE2130292A1 publication Critical patent/SE2130292A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B60R21/01332—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value by frequency or waveform analysis
    • B60R21/01336—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value by frequency or waveform analysis using filtering
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
    • G01S3/802—Systems for determining direction or deviation from predetermined direction
    • G01S3/808—Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/16—Anti-collision systems

Abstract

The invention relates to an acoustic sensor for detecting motion of wheeled motor vehicles. It comprises a microphone connected to a signal processor having a first band pass filter with an upper cutoff frequency in the order of 1 kHz and a second another band pass filter with a lower cutoff frequency in the order of 1 kHz. The signal processor is arranged to indicate proximity of wheeled motor vehicles when the output signals from the band pass filters have both during a time interval of at least 1 second had amplitudes detected as increasing without interruption above a respective threshold level.

Description

An acoustic sensor Technical field of the invention The invention relates to an acoustic sensor for detecting motion of wheeled motor vehicles. Background of the invention The US Patent No 5 878 367 shows an acoustic sensor for detecting motion of wheeled motor vehicles. A passive array of microphones is described to be mounted on a street light pole or other available pole at or near the road curb, and to be beam-steered to continuously monitor a wide predetermined field of view of the presence and location of sounds rich in certain audio frequencies which distinguish the sound of a vehicle from background noise. By tracking the incremental change in location of each detected vehicle at frequent intervals and analyzing the quality of the sound made as a vehicle passes by the microphone array, the system can compute each vehicle's speed and direction of movement. The resulting traffic information can be transmitted in real ' time to a control central, where it can be used as desired.
The known acoustic sensor needs to be improved with regard to detecting motion also of relatively silent electric motor vehicles. Moreover, a minimized current consumption is needed in many user applications.
Summary of the invention The acoustic sensor of the invention satisfies the above-described needs and is characterized by what is specified in the appended claims.
Preferred embodiment The acoustic sensor of the invention provides detection of motion of wheeled motor vehicles. It makes use of a combination of means which are per se well known in the art and which are here for that reason not shown. A microphone is connected to a signal processor having a first band pass filter with an upper cutoff frequency in the order of 1 kHz and a second band pass filter with a lower cutoff frequency in the order of 1 kHz. The signal processor is arranged to indicate proximity of wheeled motor vehicles when the output signals from the band pass filters have, during a time interval of at least 1 second, had amplitudes detected as increasing, without interruption, above a respective threshold level. As a result, the signal processor is capable of detecting motion also of quiet electric motor vehicles.
In a preferred embodiment, the first band pass filter has a lower cutoff frequency in the order of 0.5 kHz and the second bandpass filter has an upper cutoff frequency in the order of 2 kHz. Moreover, the signal processor is arranged to sample, at a rate in the order of 1 Hz, the amplitudes of the output signals from the band pass filters after rectification and integration of them with a time constant in the order of 0.1 second. It is here possible to obtain such a minimized current consumption that is needed in many user applications.
In the preferred embodiment, a common housing is arranged for two omni- directional microphones provided with a respective ear made of mass-loaded vinyl and covered completely with dead cat fur. The microphones are arranged to have a spacing in the order of 1 inch.

Claims (5)

Claims
1. An acoustic sensor for detecting motion of wheeled motor vehicles, comprising a microphone connected to a signal processor having a first pass filter with an upper cutoff frequency in the order of 1 kHz and a second band pass filter with a lower cutoff frequency in the order of 1 kHz. The signal processor is arranged to indicate proximity of wheeled motor vehicles when the output signals from the band pass filters have, during a time interval of at least 1 second, had amplitudes detected as increasing, without interruption, above a respective threshold level.
2. An acoustic sensor according to claim 1, wherein the first band pass filter has a lower cutoff frequency in the order of 0.5 kHz and the second bandpass filter has an upper cutoff frequency in the order of 2 kHz.
3. An acoustic sensor according to claim 2, wherein the signal processor is arranged to sample, at a rate in the order of 1 Hz, the output signals from the band pass filters after rectification and integration with a time constant in the order of 0.1 second.
4. An acoustic sensor according to claim 3, wherein the microphone is combined with another microphone in a common housing, the microphones being provided with a respective ear made of mass-loaded vinyl and covered completely with dead cat fur.
5. An acoustic sensor according to claim 4, wherein the microphones are arranged to have a spacing in the order of 1 inch.
SE2130292A 2021-10-30 2021-10-30 An acoustic sensor SE2130292A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE2130292A SE2130292A1 (en) 2021-10-30 2021-10-30 An acoustic sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2130292A SE2130292A1 (en) 2021-10-30 2021-10-30 An acoustic sensor

Publications (1)

Publication Number Publication Date
SE2130292A1 true SE2130292A1 (en) 2023-05-01

Family

ID=86498048

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2130292A SE2130292A1 (en) 2021-10-30 2021-10-30 An acoustic sensor

Country Status (1)

Country Link
SE (1) SE2130292A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5878367A (en) * 1996-06-28 1999-03-02 Northrop Grumman Corporation Passive acoustic traffic monitoring system
CA2228481A1 (en) * 1998-02-02 1999-08-02 Scott Andrew Rawson An acoustic highway monitor
US8076958B2 (en) * 2006-01-16 2011-12-13 Continental Teves Ag & Co. Ohg Signal preprocessing device comprising band-pass filters for structure-borne noise sensors
JP2014067091A (en) * 2012-09-24 2014-04-17 Toyota Motor Corp Vehicle detection device using traveling sound
WO2015059866A1 (en) * 2013-10-24 2015-04-30 Toyota Jidosha Kabushiki Kaisha Wind detection apparatus
US20180261237A1 (en) * 2017-03-01 2018-09-13 Soltare Inc. Systems and methods for detection of a target sound
US20180350391A1 (en) * 2017-05-03 2018-12-06 Soltare Inc. Audio processing for vehicle sensory systems

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5878367A (en) * 1996-06-28 1999-03-02 Northrop Grumman Corporation Passive acoustic traffic monitoring system
CA2228481A1 (en) * 1998-02-02 1999-08-02 Scott Andrew Rawson An acoustic highway monitor
US8076958B2 (en) * 2006-01-16 2011-12-13 Continental Teves Ag & Co. Ohg Signal preprocessing device comprising band-pass filters for structure-borne noise sensors
JP2014067091A (en) * 2012-09-24 2014-04-17 Toyota Motor Corp Vehicle detection device using traveling sound
WO2015059866A1 (en) * 2013-10-24 2015-04-30 Toyota Jidosha Kabushiki Kaisha Wind detection apparatus
US20180261237A1 (en) * 2017-03-01 2018-09-13 Soltare Inc. Systems and methods for detection of a target sound
US20180350391A1 (en) * 2017-05-03 2018-12-06 Soltare Inc. Audio processing for vehicle sensory systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
https://soundproofguide.com/mass-loaded-vinyl-mlv/ 17 MLV FACTS! [2019] *

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