EP3132282A1 - Dispositif et procédé de détection sonore d'un environnement - Google Patents

Dispositif et procédé de détection sonore d'un environnement

Info

Publication number
EP3132282A1
EP3132282A1 EP15706729.9A EP15706729A EP3132282A1 EP 3132282 A1 EP3132282 A1 EP 3132282A1 EP 15706729 A EP15706729 A EP 15706729A EP 3132282 A1 EP3132282 A1 EP 3132282A1
Authority
EP
European Patent Office
Prior art keywords
signal
partial
partial signal
sub
useful
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.)
Withdrawn
Application number
EP15706729.9A
Other languages
German (de)
English (en)
Inventor
Matthias Karl
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3132282A1 publication Critical patent/EP3132282A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52001—Auxiliary means for detecting or identifying sonar signals or the like, e.g. sonar jamming signals

Definitions

  • the present invention relates to a device and a method for sound-based environment detection.
  • the present invention relates to an evaluation of a transducer signal as to whether its quality is suitable for evaluating environmental information.
  • the ratio of the incoming signal strength of the expected signal, the signal strength of the receiver can be determined
  • Noise and the signal strength, if any, from external systems or channels during the echo cycle i.e., in the period after the emission of an acoustic measurement signal until the time when sensible echo signals can no longer be expected to change. This can e.g. due to short-term fluctuations of the
  • Noise signal or a signal entered by an external system or due to a change in the composition of the noise signal strength or the signal strength of the external signal result.
  • the useful signal, the external signal and the noise are superimposed additively, that is to say the energy received during the reception period of a signal is the sum of the individual energies.
  • Echo cycle the strength of the disturbing noise and extraneous signals are determined and taken into account accordingly within the echo cycle. It is assumed that the strength of the interfering signals during the echo cycle.
  • Transmission properties in the acoustic environment detection determined and taken into account in the subsequent signal evaluation.
  • a potentially a useful signal comprehensive first partial signal is isolated. This can be done for example by filtering (analog or digital). It is only important to detect the useful signal substantially completely and to hide interfering components at least partially.
  • a second sub-signal is isolated from the same received signal, which potentially includes an interfering signal. Accordingly, the first sub-signal and the second sub-signal are different from each other.
  • the interference signal may include, for example, a noise and / or a foreign useful signal.
  • the foreign useful signal can be assigned to the same system and used by the same system as the useful signal. Only for the considered system section or a subsequent evaluation of the received signal is the external signal not used for environment detection size.
  • Threshold compared. It is judged on the basis of the threshold value whether the useful signal potentially contained in the first sub-signal is sufficiently pure, so that in a subsequent evaluation step an environmental detection can take place using it, or if the interference contained is such
  • the first sub-signal can be rectified before the subtraction.
  • the first sub-signal and / or the second sub-signal can be weighted before the subtraction.
  • the sub-signals or one of the sub-signals are multiplied by a constant factor.
  • the second partial signal potentially comprising interfering signals is to be multiplied by a factor ⁇ 1 in order to reduce its level and to adapt its energy or power density to sometimes narrowband isolated potential useful signals.
  • the second sub-signal or the weighted second sub-signal can be rectified before the subtraction, whereby the phase information of the
  • Partial signals lose their influence on the result of the subtraction. Assuming equal-bandless signals, which is close to reality in acoustic environment detection, the rectification can be limited to only positive or negative signal periods, making rectification very easy and inexpensive (for example, by means of a diode).
  • the useful signal can be configured as an echo of an emitted measuring signal.
  • the emission of measurement signals and evaluating the provoked by them echoes a common and proven approach, which can be improved according to the invention.
  • the isolation of the first partial signal and / or the second partial signal may comprise a matched filtering of the received signal.
  • a time-variable frequency band for isolating a chirp can generate the first partial signal.
  • more complex filtering or isolation processes are possible.
  • Two principal possibilities concern the domain of the signal to be examined.
  • the useful signal or the received signal can be processed in the time domain and / or as a transform of the signal in the frequency domain.
  • the Walsh transformation and / or the Fourier transformation for example, can be used.
  • Receiving signal in that its suitability for use in the sound-based environment detection can be determined and decided on its use. If namely a strong disturbance of the
  • Receiving signal is determined, a reliable evaluation of any existing environmental objects can not be guaranteed and discarding the received signal is advisable than an acceptance of faulty detection or non-detection.
  • a predefined signal and / or no signal at all can be output.
  • This predefined signal or absence of a signal can be classified and rejected by the subsequent detection unit as an invalid input signal.
  • the detection may be performed based on other received signals or an error message may be issued indicating that the proper functioning of the
  • the method may preferably include determining a time profile of a level-dependent variable of the first partial signal and / or the second partial signal and / or the difference of both partial signals.
  • a level-dependent variable of the first partial signal and / or the second partial signal and / or the difference of both partial signals.
  • Size can be configured, for example, as an envelope of the received signal or as a rectified received signal.
  • a time period between a first echo cycle and a second echo cycle following the first echo cycle may be adjusted in response to determining the level dependent magnitude. Namely, depending on the time course of the level-dependent size of the sub-signals, a distance to an object possibly present can be estimated and the cycle duration can be adapted to the signal propagation time to be estimated during its examination.
  • the aforementioned steps may be performed within a single echo cycle for environmental detection.
  • the echo cycle is usually understood to mean the time duration between a transmission of a measurement signal and a predefined time at which no reasonably evaluable echoes are to be expected. Therefore, the present method could also be understood as an "in-cycle SNR estimation and threshold tracking".
  • An obvious “interferer” type is signals from emissions of its own system, as occur, for example, when several mutually different acoustic measurement signals are emitted at the same time or in the same echo cycle
  • cables are often called so-called orthogonal modulations (for example, in the case of DSL, the OFDM (orthogonal frequency divided
  • the transmission channels i.e., measuring signals and associated receiving filters, are each designed such that they can be inserted into the
  • Partial signal is possible according to the comments on the first sub-signal and the second sub-signal. Each combination one of 1 different
  • Weighting of the sub-signals is also possible.
  • the useful signal expected on a further channel (hereinafter referred to as "third useful signal”) can also be isolated from the received signal and used for signal-to-noise ratio analysis In this way, a level-related selection of the existing disturbance variables is made before the subtraction according to the invention takes place for evaluating the SN.sub.R.
  • the device comprises a sound transducer (for example an ultrasonic transducer), a first filter
  • the first filter can also be understood as an "insulating member", whereby one optionally on
  • a valuation unit is provided which, for example, a comparison of a generated by the subtractor
  • Sound transducer is for receiving (possibly also for sending) Acoustic signals for environment detection set up. It performs a conversion into the electrical domain and providing corresponding electrical signals to the first filter.
  • the mode of operation of the device according to the invention is evident in accordance with the statements relating to the method according to the invention that reference is made to the above statements to avoid repetition.
  • the device may also comprise a weighting element which has an optional weighting of the second partial signal and / or of the first
  • Partial signal with a factor of one different performs. This makes it possible to adapt the energies of the different partial signals and, for example, by using voltage dividers, suitable values for the subtraction on the one hand and for comparison with a reference or a threshold value on the other hand can be used.
  • a crosstalk of a useful signal of a foreign channel to a transducer of a channel considered can be recognized and considered according to the invention.
  • an input filter can be provided, through which a theoretically infinite power of a
  • Input signal is limited to a total bandwidth. That the
  • Input filter downstream filter for isolation of the desired signal or the useful signals is preferably adapted to the expected signal (English:
  • Devices optionally each of a rectification and a low pass.
  • a reference signal is generated and the difference between the two signals is determined by means of a threshold value switch.
  • a simple switch can be used, which only the received signal on a Input of a distance detection unit outputs when the useful signal is present in a minimum quality, so has a minimum value. Otherwise will be one
  • predefined value e.g., zero
  • Figure 1 is a block diagram illustrating an embodiment of a device according to the invention
  • Figure 2 is a block diagram of an alternative embodiment of a device according to the invention.
  • Figure 3 is a flow chart illustrating steps of a
  • Figure 1 shows a block diagram of an embodiment of a
  • Sound transducer passes an ambient noise as a received signal r (t) to an input 2.
  • the input 2 is followed by an input filter 3, by means of which a conditioning of the received signal r (t) takes place by a pre-filtering.
  • the processed signal is applied to a plurality of matched filters 10, 11, 12, which are tuned to different partial signals of the received signal.
  • a first matched filter 10 is set up to isolate a first useful signal Sj (t) from the received signal r (t).
  • a second matched filter 10 is set up to isolate a first useful signal Sj (t) from the received signal r (t).
  • adapted filter 1 1 is set up, a first Fremdkanalnutzsignal Si1 (t) (Payload, which is intended for a channel other than the considered) to isolate from the received signal r (t).
  • a third matched filter 12 is arranged to isolate a second foreign channel payload signal Si2 (t) from the received signal r (t).
  • the outputs of the matched filters 10, 11, 12 are directed to respective weighting members 20, 21, 22.
  • Weighting members 20, 21, 22 must use a one-of-a different weighting factor or have to be present at all.
  • weighting members 20, 21, 22 perform rectification of the component signals Sj (t), Si1 (t), Si2 (t).
  • a downstream summing unit 70 is used
  • Valuation unit 59 forwarded.
  • the evaluation unit 59 forwards the first sub-signal Sj (t) to an output 60 so that partial signals containing useful signals that are used for subsequent environmental detection are used.
  • Figure 2 shows an analogous embodiment of an embodiment corresponding to the circuit already shown in Figure 1 in principle.
  • the matched filter 10, 1 1, 12 configured as an analog bandpass filter, wherein the passband Bs1 only proportionally with the
  • a weighting element 20 Downstream of the first matched filter 10 is a weighting element 20, which comprises a bridge circuit 200 as a rectifier and a low-pass filter RC for smoothing the rectified signal. Also the other matched filters 11, 12 are
  • Low-pass RC downstream For weighting voltage dividers 300, 40, 50 and in the case of the signal paths for the Fremdkanalnutzsignale also diodes D for ORing the outputs downstream. The outputs of the diodes D are connected via an ohmic resistor 3 to the electrical ground. By the diodes D is a maximum value function for the
  • This maximum signal is applied by an operational amplifier 302 as a subtractor from one at its positive input applied weighted first sub-signal Sj (t) deducted.
  • the operational amplifier 302 is fed back via an ohmic resistor 301 and an ohmic resistor 303. Its output signal, by driving a switch 304, determines whether an output 60 of the circuit has the predefined output value zero or the first sub-signal
  • FIG. 3 shows method steps of an embodiment of a
  • step 100 a reception signal is received by means of an ultrasonic transducer of an environment detection system.
  • Converter converts the received signal into the electrical domain and performs in step 200 an input filtering, by means of which a
  • step 300 partial signals are isolated from the received signal, of which a first partial signal contains potentially useful sound, a second partial signal receives an increased relative to the first partial signal Störschallanteil and a third partial signal and a fourth partial signal each contain potential useful signals from foreign channels ("Fremdkanalnutzsignale").
  • step 400 the partial signals are rectified and weighted in step 500 to produce a subsequent subtraction according to the invention to a result which is equivalent to a signal-to-noise ratio determination
  • the fourth partial signal is combined by a maximum value function and the result is subtracted from the first partial signal in step 700.
  • step 800 the difference is compared with a predefined threshold value, wherein it is determined whether the signal-to-noise ratio determined in accordance with the invention is suitable for present purposes.
  • step 900 a time profile of a level-dependent magnitude of the first partial signal and the second partial signal and the difference between the two partial signals is determined and in response thereto in step 1000 a time period between a start of a first echo cycle and a start of a second immediately after the first echo cycle second Echo cycle adjusted.
  • step 1100 in response to the comparison result between the difference and the threshold, the first sub-signal is provided for sound-based environmental detection or a predefined fixed signal is sent to a downstream system

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne un dispositif et un procédé de détection sonore d'un environnement. Le procédé comprend les étapes consistant à isoler une première partie de signal (sj(t)) comprenant potentiellement un signal utile à partir d'un signal reçu (r(t)), isoler une deuxième partie de signal (si1(t)), différente de la première partie de signal, comprenant potentiellement un signal parasite à partir du signal reçu (r(t)), soustraire la deuxième partie de signal (si1(t)) de la première partie de signal (sj(t)), et comparer la différence à une valeur seuil. Le signal reçu est ainsi évalué lorsque sa qualité est adéquate pour évaluer des informations concernant l'environnement.
EP15706729.9A 2014-04-14 2015-02-16 Dispositif et procédé de détection sonore d'un environnement Withdrawn EP3132282A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014207086.4A DE102014207086A1 (de) 2014-04-14 2014-04-14 Vorrichtung und Verfahren zur schallbasierten Umfelddetektion
PCT/EP2015/053187 WO2015158445A1 (fr) 2014-04-14 2015-02-16 Dispositif et procédé de détection sonore d'un environnement

Publications (1)

Publication Number Publication Date
EP3132282A1 true EP3132282A1 (fr) 2017-02-22

Family

ID=52595292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15706729.9A Withdrawn EP3132282A1 (fr) 2014-04-14 2015-02-16 Dispositif et procédé de détection sonore d'un environnement

Country Status (4)

Country Link
EP (1) EP3132282A1 (fr)
CN (1) CN106170715B (fr)
DE (1) DE102014207086A1 (fr)
WO (1) WO2015158445A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11119200B2 (en) * 2017-06-01 2021-09-14 Mitsubishi Electric Corporation Object detection apparatus, object detection method, and computer readable medium
DE102018206702A1 (de) * 2018-05-02 2019-11-07 Robert Bosch Gmbh Verfahren und Vorrichtung zum Verarbeiten eines durch einen Ultraschallsensor aufgezeichneten Ultraschallsignals
DE102019216729A1 (de) * 2019-10-30 2021-05-06 Robert Bosch Gmbh Verfahren und Vorrichtung zur Optimierung einer ultraschallbasierten Umfelderfassung für ein Fortbewegungsmittel

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DE2059507A1 (de) * 1970-12-03 1972-06-08 Krupp Gmbh Schaltanordnung zum Bedaempfen eines breitbandigen Grundstoerpegels und ihm ueberlagerter Stoersignale
JPS5938675A (ja) * 1982-08-30 1984-03-02 Nissan Motor Co Ltd 車両用障害物検知装置
US5056068A (en) * 1990-02-05 1991-10-08 Accu-Sport International, Inc. Apparatus and method for detecting sharp signal variations against ambient signals
JP2003107156A (ja) * 2001-07-23 2003-04-09 Denso Corp 障害物検出装置及び記録媒体
DE102004006015A1 (de) 2004-02-06 2005-08-25 Robert Bosch Gmbh Verfahren und Vorrichtung zur Anpassung eines Schwellwertes einer Detektionseinrichtung
DE102009054667A1 (de) 2009-12-15 2011-06-16 Robert Bosch Gmbh Verfahren und Vorrichtung zur Abschätzung der Übertragungscharakteristiken sowie zur Kompensation von Wandler-induzierten Merkmalsstreuungen
DE102010020023A1 (de) * 2010-05-10 2011-11-10 Valeo Schalter Und Sensoren Gmbh Verfahren und Vorrichtung zur Rauschoptimierung eines Echosignals zur Fahrzeugumfelderfassung sowie zugehörige Vorrichtung zur Fahrzeugumfelderfassung
DE102011102574B4 (de) * 2011-05-26 2017-05-11 Valeo Schalter Und Sensoren Gmbh Verfahren zur Erzeugung einer Schwellwertkurve, Verfahren zur Entfernungsbestimmung und Vorrichtung zur Umfelderfassung in einem Fahrzeug
DE102012017367B4 (de) * 2012-09-01 2023-07-06 Valeo Schalter Und Sensoren Gmbh Verfahren zum Bestimmen des Signal-Rausch-Verhältnisses eines Zielechos eines von einem Ultraschallsensor eines Kraftfahrzeugs empfangenen Empfangssignals, Fahrerassistenzeinrichtung und Kraftfahrzeug

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See also references of WO2015158445A1 *

Also Published As

Publication number Publication date
DE102014207086A1 (de) 2015-10-15
WO2015158445A1 (fr) 2015-10-22
CN106170715B (zh) 2020-05-05
CN106170715A (zh) 2016-11-30

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