EP3807869B1 - Method for operating an engine order cancellation system - Google Patents

Method for operating an engine order cancellation system Download PDF

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Publication number
EP3807869B1
EP3807869B1 EP18734148.2A EP18734148A EP3807869B1 EP 3807869 B1 EP3807869 B1 EP 3807869B1 EP 18734148 A EP18734148 A EP 18734148A EP 3807869 B1 EP3807869 B1 EP 3807869B1
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EP
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Prior art keywords
eoc system
spectral components
eoc
signals
operating parameter
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EP18734148.2A
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German (de)
French (fr)
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EP3807869A1 (en
Inventor
Denis Perechnev
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Ask Industries GmbH
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Ask Industries GmbH
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823Reference signals, e.g. ambient acoustic environment
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787General system configurations
    • G10K11/17879General system configurations using both a reference signal and an error signal
    • G10K11/17883General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10Applications
    • G10K2210/128Vehicles
    • G10K2210/1282Automobiles
    • G10K2210/12822Exhaust pipes or mufflers

Definitions

  • the invention relates to a method for operating an engine order cancellation system which, based on operating parameters of the EOS system, is set up to generate compensation signals serving to compensate for acoustic interference signals resulting from the operation of a motor vehicle drive unit.
  • EOC systems for short, which on the basis of system-side operating parameters to generate compensation from the operation of a motor vehicle-side drive unit, d. H. e.g. B. an internal combustion engine, resulting acoustic interference signals serving compensation signals are known from the prior art in principle. Equally, methods for operating corresponding EOC systems from the prior art are basically known. The objective of such methods is the most complete possible suppression of acoustic interference signals that result from the operation of a motor vehicle drive unit and are introduced into a passenger compartment of the motor vehicle.
  • U.S. 5,170,433A discloses an active vibration system for reducing vibration.
  • EP 0 724 762 B1 discloses a control system for changing the frequency spectrum of an acoustic jamming signal.
  • WO 2017/157596 A1 discloses a control device for compensating for acoustic interference signals.
  • the invention is based on the object of specifying an improved method for operating an EOC system, in particular with regard to the most stable or robust operation of an EOC system.
  • the method described herein serves to operate an EOC system, which is based on system-side operating parameters, i. H. on the basis of operating parameters - as will be seen below, corresponding operating parameters are a forgetting factor ⁇ or a step size ⁇ (adaptation step size) of the EOC system - for generating the compensation of acoustic interference signals resulting from the operation of a motor vehicle-side drive unit - these include, in particular, acoustic interference signals such as e.g. B. speed-dependent vibrations of certain harmonic order to understand - serving compensation signals is set up.
  • acoustic interference signals such as e.g. B. speed-dependent vibrations of certain harmonic order to understand - serving compensation signals is set up.
  • the EOC system that can be operated or operated according to the method is typically installed in a motor vehicle in which it is used to compensate for H. e.g. B. an internal combustion engine, resulting acoustic noise signals is used.
  • the operation of an EOC system basically includes the detection of corresponding acoustic interference signals by means of a suitable acoustic sensor device or this associated acoustic sensor elements - this can be z.
  • B. act around microphones - the EOC system, the generation of artificial compensation signals based on the detected acoustic interference signals and outputs the compensation signals generated by means of a suitable acoustic output device or this associated acoustic output elements - this can be z.
  • the compensation signals cause, in particular due to a phase opposite to the phase of the respective acoustic interference signals, an optionally complete suppression of the acoustic interference signals, so that the acoustic interference signals are acoustically imperceptible or hardly perceptible to vehicle occupants.
  • a first step of the method all audio output devices comprising at least one audio output element, ie e.g. a loudspeaker, are detected in an interior of a motor vehicle equipped with the EOC system, ie in particular in a passenger compartment of a motor vehicle equipped with the EOC system audio signals to be output.
  • Corresponding audio signals are, for example, music and/or speech signals.
  • Corresponding audio signals are typically not compensation signals that can be generated or are generated by the EOC system.
  • all audio output devices on the motor vehicle side this can be z.
  • an entertainment and / or multimedia device for outputting entertainment and / or multimedia content in the interior, ie in particular in the passenger compartment, act of the motor vehicle - or one or more of the audio output device associated audio output elements detected.
  • the audio signals can be detected via a detection device implemented in hardware and/or software.
  • the detection device can form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • the audio signals to be output into the interior or into the passenger compartment of the motor vehicle are typically detected before the actual output of the audio signals into the interior of the motor vehicle.
  • the audio signals to be output into the interior of the motor vehicle are detected in particular before the audio signals are detected by the acoustic sensor device of the EOC system or an acoustic sensor element associated with it.
  • a sum signal describing all recorded audio signals is generated.
  • all recorded audio signals are then summed - the summation can e.g. B. done by an arithmetic summation - and described in a sum signal.
  • the summation signal can thus be generated by (arithmetically) summing up all of the recorded audio signals.
  • the sum signal therefore contains all recorded audio signals or their sum.
  • the sum signal also contains all possible harmonic and non-harmonic components of the audio signals to be output into the interior of the motor vehicle as well as all associated audio signal output parameters, i. H. e.g. B.
  • the summation of the audio signals and the generation of a corresponding sum signal can be done via a summing device implemented in hardware and/or software.
  • the summing device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • those spectral components of the sum signal are extracted whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system.
  • the sum signal is processed in such a way that those spectral components of the sum signal whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system are extracted from the sum signal.
  • the frequencies of the extracted spectral components of the sum signal and the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system are therefore typically the same frequencies.
  • the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system are typically known for each EOC system, so that in the third step a comparison of the frequencies of the extracted spectral components of the sum signal with the known frequencies of the signals generated by the EOC -System to be compensated or compensated for acoustic interference signals.
  • the extraction of the spectral components of the sum signal, the frequencies of which correspond to the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system can take place via an extraction device implemented in hardware and/or software.
  • the extraction device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • the third step i. H. before extracting the spectral components, if necessary, are or have been pre-filtered, d. H. one by means of a pre-filtering device - this can be z. B. be a low-pass filter device - are or have been subjected to pre-filtering carried out. If necessary, the pre-filtering can simplify or improve the extraction of the spectral components.
  • the extracted spectral components are modified to generate modified spectral components.
  • the spectral components extracted in the third step ie the spectral components of the sum signal whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system, are then specifically modified or changed.
  • the modification can take place via a modification device implemented in hardware and/or software.
  • the modification device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • the modified spectral components are converted into at least one operating parameter of the EOC system.
  • the modified spectral components generated in the fourth step are converted into an operating parameter of the EOC system by suitable data or signal processing.
  • the operating parameter of the EOC system can typically be influenced or influenced or described or described by the spectral components, so that a conversion is possible.
  • the operating parameter of the EOC system is also typically describable numerically.
  • the operating parameter of the EOC system is the forgetting factor ⁇ or the step size ⁇ . This applies in particular to an EOC system operated on the principle of an LMS algorithm (least mean square algorithm).
  • the conversion can take place via a conversion device implemented in hardware and/or software.
  • the conversion device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • the operating parameter of the EOC system obtained by converting the modified spectral components is compared with at least one comparison operating parameter or reference operating parameter.
  • the subsequent selection of an operating parameter of the EOC system is compared with at least one comparison operating parameter, in preparation for the later selection of an operating parameter of the EOC system.
  • the operating parameter of the EOC system obtained in the fifth step is the forgetting factor ⁇ or the increment ⁇ .
  • the comparison parameter can therefore be e.g. B. be a comparison forgetting factor ⁇ 'or a comparison increment ⁇ '.
  • the comparison operating parameter can typically be influenced or influenced or described or described by the spectral components.
  • the comparison operating parameter can also typically be described numerically, so that in the sixth step of the method a (simple) numerical comparison of operating parameters with comparison operating parameters can be carried out.
  • the comparison can take place via a comparison device implemented in hardware and/or software.
  • the comparison facility can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • a seventh step of the method the most (positive) or least (negative) influence on the performance, in particular the reduction or increase in the performance, of the EOC system and/or the most (positive) or least (negative) influence on the stability or robustness, in particular the reduction or increase in the stability or the robustness, of the operating parameter having the EOC system on the basis of the comparison.
  • that operating parameter is selected which or its (numerical) value has the most (positive) or least (negative) influence on the performance, in particular the reduction or increase in performance, of the EOC system and/or has the most (positive) or least (negative) influence on the stability or robustness, in particular the reduction or increase in stability or robustness, of the EOC system.
  • That operating parameter is selected which causes a (maximum) increase in the stability of the EOC system, which can possibly be accompanied by a reduction in the performance of the EOC system.
  • the selected operating parameter of the EOC system is a forgetting factor ⁇ or an increment ⁇ .
  • the operating parameters are selected in particular with the proviso that the stability or robustness of the EOC system under the given acoustic conditions is influenced as little as possible, i. H. reduced as little as possible or influenced as positively as possible, d. H. increased as possible.
  • the selection can be made via a selection device implemented in hardware and/or software.
  • the selection device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.
  • the operating parameter having the lowest or highest value can be selected.
  • the selection of an operating parameter with the lowest value applies in particular to the forgetting factor ⁇ as an example of an operating parameter or the comparison of a forgetting factor ⁇ with a comparison forgetting factor ⁇ ′.
  • the EOC system is operated using the selected operating parameter.
  • the selected operating parameter is then used as a basis for generating corresponding compensation signals.
  • the compensation signals can be output via at least one output element associated with the EOC system and/or via audio output elements of the audio output device. In the latter case, the compensation signals can be added to the audio signal to be output or output via the audio output elements of the audio output device.
  • pre-filtering can be carried out before the spectral components of the sum signal are detected in the third step.
  • the pre-filtering can be used in particular to filter frequency ranges of the sum signal, i. H. in particular to remove those which do not correspond to the frequency range in which the EOC system generates compensation signals.
  • the pre-filtering device used can therefore be set up in particular to filter frequency ranges of the sum signal, i. H. in particular to remove those which do not correspond to the frequency range in which the EOC system generates compensation signals.
  • the modification of the detected spectral components to generate modified spectral components can be done by generating an additional input amplification, ie an additional gain, in the area of a first (local) increase in the respective spectral component(s) in the time domain.
  • the detected spectral components can therefore be generated by a specifically generated amplification in the area of a first increase in the respective spectral component in the time domain.
  • the spectral components are typically is a frequency spectrum plotted as a function of time, ie in the time domain. In particular, this means a change in the extracted spectral components over time.
  • the modification of the recorded spectral components to generate modified spectral components can alternatively or additionally be done by lengthening the time of the spectral components in the area of a (local) decrease, in particular a decrease following a (local) increase, of the spectral components in the time domain.
  • the detected spectral components can therefore be produced by a specifically generated lengthening (stretching) in the area of a corresponding descent of the respective spectral component in the time domain.
  • the time extension of the descent of the respective spectral component (s) can z. B. a by the duration of an impulse response, d. H. in particular a room impulse response, an acoustic sensor element associated with the EOC system or an acoustic sensor device associated with the EOC system, d. H. e.g. B. a microphone, according to an audio signal emitted into the interior correspond to a certain time interval.
  • the lengthening of the descent over time can follow an envelope curve by a signal curve of the or an impulse response, d. H. correspond in particular to a room impulse response, an acoustic sensor device associated with the EOC system or an acoustic sensor element associated with such an acoustic sensor element after a certain time interval emitted into the interior of the vehicle.
  • the spectral components can, for example, have a rectangular (temporal) profile with a particular sudden rise from a reference value to a plateau value at a specific point in time, a specific temporal, essentially constant profile on the plateau value and a specific point in time from the plateau value occurring, in particular sudden, descent to the reference value.
  • Other spectral curves are fundamentally conceivable.
  • the modification of spectral components exhibiting a corresponding rectangular or square-shaped course can be carried out accordingly by generating an additional input amplification, ie an additional gain, in the area of the first increase.
  • the modification of spectral components exhibiting such a rectangular or rectangular course can be carried out accordingly by lengthening or stretching in the region of the descent. The same applies to spectral components which have different types of profiles in comparison to rectangular or rectangular profiles.
  • the audio signals to be output into the interior of the motor vehicle are detected in particular before the audio signals are detected by the acoustic sensor device of the EOC system.
  • the recording and summarizing of all audio signals to be output via the audio output device therefore takes place in particular before the audio signals are actually output via the audio output device into the interior of the motor vehicle equipped with the EOC system operated or operable according to the method.
  • the recording and summarizing of all audio signals to be output via the audio output device therefore takes place in particular before the audio signals are actually acoustically perceptible, i. H. in particular audibly, for a vehicle occupant located in the interior of the motor vehicle equipped with the EOC system operated or operable according to the method.
  • the invention also relates to an EOC system for a motor vehicle according to claim 8, which is set up to generate compensation signals serving to compensate for acoustic interference signals resulting from the operation of the or a motor vehicle drive unit.
  • the EOC system is set up to carry out the method. All statements in connection with the procedure apply analogously to the EOC system.
  • the EOC system therefore includes in particular the functional components mentioned in connection with the method, ie in particular the devices implemented in terms of hardware and/or software, of the EOC system or a control device of the EOC system.
  • the EOC system or a control device of the EOC system communicates with the functional components mentioned in connection with the method, ie in particular the hardware and/or software implemented devices of the EOC system.
  • the invention also relates to a motor vehicle, i. H. in particular a passenger car, which comprises at least one EOC system as described herein. All statements in connection with the method therefore also apply analogously to the motor vehicle.
  • FIG. 1 shows a basic representation of a flowchart to illustrate a method according to an embodiment.
  • the method is used to operate an EOC system 1, which, on the basis of or using system-side operating parameters, such as a forgetting factor ⁇ and an increment ⁇ , is used to generate compensation signals that serve to compensate for acoustic interference signals 3 resulting from the operation of a motor vehicle drive unit 2 4 is set up.
  • system-side operating parameters such as a forgetting factor ⁇ and an increment ⁇
  • the EOC system 1 that can be operated or operated according to the method is installed in a motor vehicle 5, in which it is used to compensate for from the operation of the drive unit 2 on the motor vehicle, ie e.g .
  • the operation of the EOC system 1 basically includes the detection of corresponding acoustic interference signals 3 by means of a suitable acoustic sensor device 6 or acoustic sensor elements 7 associated with it.
  • B. act around microphones - of the EOC system 1, the generation of artificial compensation signals 4 on the basis of the detected acoustic interference signals 3 and the outputs of the generated compensation signals 4 by means of a suitable acoustic output device 9 or this associated acoustic output elements 10 - this can be z .
  • B. are speakers - in the passenger compartment 8 of the motor vehicle 5 equipped with the EOC system 1.
  • the compensation signals 4 cause, in particular due to a phase opposite to the phase of the respective acoustic interference signals 3, an optionally complete suppression of the acoustic interference signals 3, so that the acoustic interference signals 3 are acoustically imperceptible or hardly perceptible to vehicle occupants.
  • a first step S1 of the method all of the audio output elements 11 via one or more audio output elements are detected—this can be z.
  • B. be speakers - comprehensive audio output device 12 in the passenger compartment 8 of equipped with the EOC system 1 motor vehicle 5 audio signals 13 to be output.
  • the audio signals 13 are, for example, music and / or voice signals.
  • the audio signals 13 are not the compensation signals 4 that can be generated or are generated by the EOC system 1.
  • B. be an entertainment and / or multimedia device for outputting entertainment and / or multimedia content in the passenger compartment 8 of the motor vehicle 5 act - or detected via the audio output device 12 associated audio output elements 11.
  • the audio signals 13 are detected via a detection device 14 implemented in hardware and/or software.
  • the detection device 14 can form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .
  • the audio signals 13 to be output into the passenger compartment 8 are detected before the actual output of the audio signals 13 into the passenger compartment 8.
  • the audio signals 13 to be output into the passenger compartment 8 are detected in particular before the audio signals 13 are detected by the acoustic sensor device 6 of the EOC System 1 or the associated acoustic sensor elements 7.
  • a sum signal 15 describing all recorded audio signals 13 is generated.
  • B. done by an arithmetic summation - and described in a sum signal 15.
  • the summation signal 15 can therefore be generated by (arithmetically) summing up all of the recorded audio signals 13 .
  • the sum signal 15 therefore contains all recorded audio signals 13 or their sum.
  • Sum signal 15 also contains in particular all possible harmonic and non-harmonic components of audio signals 13 and all associated audio signal output parameters, i. H. e.g. B. volume, treble, middle, bass (bass), etc., and/or audio signal processing parameters, d. H. e.g. B. non-linear audio signal processing parameters, delay, reverberation, etc.
  • the summation of the audio signals 13 and the generation of the sum signal 15 takes place via a hardware and/or software implemented summation device 16.
  • the summation device 16 can also be implemented in hardware and/or software form a functional component of the EOC system 1 or a control device 28 of the EOC system 1 .
  • a third step S3 of the method those spectral components of the sum signal 15 are extracted whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 .
  • signal processing of the sum signal 15 takes place in such a way that those spectral components of the sum signal 15 whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated by the EOC system 1 are extracted from the sum signal 15.
  • the frequencies of the extracted spectral components of the sum signal 15 and the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 are therefore typically same frequencies.
  • the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system 1 are known for the EOC system 1, so that in the third step S3 a comparison of the frequencies of the extracted spectral components of the sum signal 15 with the known frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 .
  • the extraction of the spectral components of the sum signal 15, the frequencies of which correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1, takes place via an extraction device 17 implemented in hardware and/or software.
  • the extraction device 17 can also have a hardware and/or a functional component of the EOC system 1 implemented in terms of software or a control device 28 of the EOC system 1.
  • the sum signal 15 is pre-filtered (optional) before extracting the spectral components, i. H. one by means of a pre-filtering device 18 - this can be z. B. be a low-pass filter device - subjected to pre-filtering carried out.
  • the pre-filtering can be used in particular to filter frequency ranges of the sum signal 15 which do not correspond to the frequency range in which the EOC system 1 generates compensation signals.
  • the pre-filtering device 18 can therefore be set up in particular to filter frequency ranges of the sum signal 15 which do not correspond to the frequency range in which the EOC system 1 generates compensation signals.
  • a fourth step S4 of the method the extracted spectral components are modified to generate modified spectral components.
  • the spectral components extracted in the third step S3, ie the spectral components of the sum signal 15, whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated by the EOC system 1, are then specifically modified or changed .
  • the modification takes place via a modification device 19 implemented in hardware and/or software.
  • the modification device 19 can also form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .
  • the modified spectral components are converted into at least one operating parameter of the EOC system 1.
  • the modified spectral components generated in the fourth step S4 are converted into an operating parameter by suitable data or signal processing of the EOC system 1 converted.
  • the operating parameter of the EOC system 1 can typically be influenced or influenced or described or described by the spectral components, so that a conversion is possible.
  • the operating parameter of the EOC system 1 can also typically be described numerically.
  • the operating parameter of the EOC system 1 is the forgetting factor ⁇ or the increment ⁇ .
  • the conversion takes place via a hardware and/or software implemented conversion device 20.
  • the conversion device 20 can also form a hardware and/or software implemented functional component of the EOC system 1 or a control device 28 of the EOC system 1.
  • a sixth step S6 of the method the operating parameter of the EOC system 1 obtained by converting the modified spectral components is compared with at least one comparison operating parameter or reference operating parameter.
  • the subsequent selection of an operating parameter of the EOC system 1 is then compared in preparation for the operating parameter of the EOC system 1 obtained in the fifth step S5 with at least one comparison operating parameter.
  • the operating parameter of the EOC system 1 obtained in the fifth step S5 is the forgetting factor ⁇ or the increment ⁇ .
  • the comparison parameter can therefore be e.g. B. be a comparison forgetting factor ⁇ 'or a comparison increment ⁇ '.
  • the comparison operating parameter can typically be influenced or influenced or described or described by the spectral components.
  • the comparison operating parameter can also typically be described numerically, so that a (simple) numerical comparison of operating parameters with comparison operating parameters can be carried out in the sixth step S6.
  • the comparison takes place via a comparison device 21 implemented in hardware and/or software.
  • the comparison device 21 can also form a hardware and/or software-implemented functional component of the EOC system 1 or a control device 28 of the EOC system 1 .
  • a seventh step S7 of the method the most positive or least negative influence on the performance of the EOC system 1 and/or the most positive or least negative influence on the stability or robustness of the EOC system 1 is selected respectively the stability or robustness of the operation of the EOC system 1 having operating parameters on the basis of the comparison.
  • that operating parameter is then selected which or its (numerical) value has the most positive or least negative influence on the performance of the EOC system 1 and/or the most positive or least negative Influence on the stability or robustness of the EOC system 1 has.
  • the selected operating parameter of the EOC system 1 is the forgetting factor ⁇ or the increment ⁇ .
  • the operating parameters are selected in particular with the proviso that the stability or robustness of the EOC system 1 under the given acoustic conditions is influenced as little as possible, i. H. reduced as little as possible or influenced as positively as possible, d. H. increased as possible.
  • the selection is made via a selection device 22 implemented in hardware and/or software.
  • the selection device 22 can also form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .
  • the operating parameter having the lowest or highest value can be selected.
  • the selection of an operating parameter that has the lowest value applies in particular to the forgetting factor ⁇ , since a forgetting factor ⁇ that has the lowest possible value typically allows the EOC system 1 to operate as stably as possible.
  • step S8 of the method the EOC system 1 is finally operated using the selected operating parameter.
  • the selected operating parameter is then used as a basis for generating corresponding compensation signals 4 during operation of the EOC system 1 .
  • the output of Compensation signals 4 can be output from the output element(s) 10 associated with the EOC system 1 and/or via the audio output element(s) 11 of the audio output device 12 . In the latter case, the compensation signals 4 can be added to the audio signal to be output or output via the audio output element(s) 11 of the audio output device 12 .
  • FIG. 3 shows a basic representation of a time course of spectral components 23 according to an embodiment; in the 3 The spectral components 23 shown are therefore plotted in the time domain, with the x-axis representing the time axis.
  • the spectral components 23 can have a square-wave (time) profile with a particular time t 1 occurring from a reference value R, in particular a sudden increase to a plateau value P, a certain time-related, essentially constant profile on the plateau value P and a, in particular sudden, drop 27 from the plateau value P to the reference value R at a specific point in time t 2 .
  • the spectral components 23 can therefore take place through a specifically generated amplification in the area of a first rise 24 of the spectral components 23 in the time domain.
  • the purposefully generated amplification takes place in the exemplary embodiment according to FIG 3 at time t 1 .
  • the modification of the spectral components 23 to generate modified spectral components can - as well as in 3 shown - alternatively or additionally by temporal extension 26 (expansion) of the spectral components 23 in the region of a (local) descent 27, in particular one of the (local) rise 24 following (Local) descent 27, the spectral components 23 take place in the time domain.
  • the spectral components 23 can therefore occur through a specifically generated extension 26 in the area of a corresponding descent 27 of the spectral components 23 in the time domain.
  • the specifically generated extension 26 takes place in the exemplary embodiment according to FIG 3 at time t 2 .
  • the time extension 26 of the descent 27 of the spectral components 23 can be influenced by the duration of an impulse response, i. H. correspond in particular to a room impulse response of an acoustic sensor element 7 associated with the EOC system 1 or the acoustic sensor device 6 associated therewith after a certain time interval emitted into the passenger compartment 8 audio signal.
  • the time extension 26 of the descent 27 can be extended over time according to an envelope by a signal curve of the or an impulse response, i. H. in particular a room impulse response corresponding to the acoustic sensor device 6 associated with the EOC system 1 or to the acoustic sensor element 7 associated with it after a specific time interval emitted into the passenger compartment 8 audio signal.

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Description

Die Erfindung betrifft ein Verfahren zum Betrieb eines Engine-Order-Cancellation-Systems, welches auf Grundlage von Betriebsparametern des EOS-Systems zur Erzeugung von der Kompensation von aus dem Betrieb eines kraftfahrzeugseitigen Antriebsaggregats resultierenden akustischen Störsignalen dienenden Kompensationssignalen eingerichtet ist.The invention relates to a method for operating an engine order cancellation system which, based on operating parameters of the EOS system, is set up to generate compensation signals serving to compensate for acoustic interference signals resulting from the operation of a motor vehicle drive unit.

Engine-Order-Cancellation-Systeme, kurz EOC-Systeme, welche auf Grundlage von systemseitigen Betriebsparametern zur Erzeugung von der Kompensation von aus dem Betrieb eines kraftfahrzeugseitigen Antriebsaggregats, d. h. z. B. eines Verbrennungsmotors, resultierenden akustischen Störsignalen dienenden Kompensationssignalen eingerichtet sind, sind aus dem Stand der Technik dem Grunde nach bekannt. Gleichermaßen sind auch Verfahren zum Betrieb entsprechender EOC-Systeme aus dem Stand der Technik dem Grunde nach bekannt. Zielsetzung entsprechender Verfahren ist eine möglichst vollständige Unterdrückung von aus dem Betrieb eines kraftfahrzeugseitigen Antriebsaggregats resultierenden, in eine Fahrgastzelle des Kraftfahrzeugs eingebrachten akustischen Störsignalen.Engine order cancellation systems, EOC systems for short, which on the basis of system-side operating parameters to generate compensation from the operation of a motor vehicle-side drive unit, d. H. e.g. B. an internal combustion engine, resulting acoustic interference signals serving compensation signals are known from the prior art in principle. Equally, methods for operating corresponding EOC systems from the prior art are basically known. The objective of such methods is the most complete possible suppression of acoustic interference signals that result from the operation of a motor vehicle drive unit and are introduced into a passenger compartment of the motor vehicle.

Wenngleich gängige EOC-Systeme zufriedenstellende Ergebnisse im Hinblick auf die Kompensation entsprechender akustischer Störsignale liefern, besteht ein Bedarf nach neuen Ansätzen zur Erhöhung der Stabilität sowie der Robustheit des Betriebs entsprechender EOC-Systeme. Dies z. B. vor dem Hintergrund, dass der Betrieb entsprechender EOC-Systeme bisweilen durch externe Störgrößen, d. h. insbesondere durch externe Störgeräusche, beeinflussbar bzw. beeinflusst ist, sodass Ansätze zur Erhöhung der Stabilität sowie der Robustheit gegenüber entsprechenden Störgrößen des Betriebs entsprechender EOC-Systeme erforderlich sind.Although current EOC systems deliver satisfactory results with regard to the compensation of corresponding acoustic interference signals, there is a need for new approaches to increase the stability and the robustness of the operation of corresponding EOC systems. This z. B. against the background that the operation of corresponding EOC systems is sometimes affected by external disturbances, i. H. can be influenced or influenced, in particular by external noise, so that approaches to increasing the stability and robustness to corresponding disturbance variables of the operation of corresponding EOC systems are required.

Bisher untersuchte Ansätze sind unter dem Aspekt eines möglichst stabilen bzw. robusten Betriebs entsprechender EOC-Systeme jedoch verbesserungs- bzw. weiterentwicklungsfähig.However, approaches that have been investigated so far can be improved or further developed from the point of view of the most stable or robust operation of corresponding EOC systems.

US 5 170 433 A offenbart ein aktives Vibrationssystem zur Reduzierung von Vibrationen. U.S. 5,170,433A discloses an active vibration system for reducing vibration.

EP 0 724 762 B1 offenbart ein Steuersystem zur Veränderung des Frequenzspektrums eines akustischen Störsignals. EP 0 724 762 B1 discloses a control system for changing the frequency spectrum of an acoustic jamming signal.

WO 2017/157596 A1 offenbart eine Steuereinrichtung zur Kompensation von akustischen Störsignalen. WO 2017/157596 A1 discloses a control device for compensating for acoustic interference signals.

Der Erfindung liegt die Aufgabe zugrunde, ein, insbesondere unter dem Aspekt eines möglichst stabilen bzw. robusten Betriebs eines EOC-Systems, verbessertes Verfahren zum Betrieb eines EOC-Systems anzugeben.The invention is based on the object of specifying an improved method for operating an EOC system, in particular with regard to the most stable or robust operation of an EOC system.

Die Aufgabe wird durch ein Verfahren zum Betrieb eines Engine-Order-Cancellation-Systems (EOC-Systems) gemäß Anspruch 1 gelöst. Die hierzu abhängigen Ansprüche betreffen mögliche bzw. zweckmäßige Ausführungsformen des Verfahrens.The object is achieved by a method for operating an engine order cancellation system (EOC system) according to claim 1. The dependent claims relate to possible or expedient embodiments of the method.

Das hierin beschriebene Verfahren dient dem Betrieb eines EOC-Systems, welches auf Grundlage von systemseitigen Betriebsparametern, d. h. auf Grundlage von Betriebsparametern - wie sich im Weiteren ergibt, handelt es sich bei entsprechenden Betriebsparametern um einen Vergessensfaktor λ (engl. Forgetting-Factor) oder um eine Schrittweite µ (engl. adaptation step size) des EOC-Systems - zur Erzeugung von der Kompensation von aus dem Betrieb eines kraftfahrzeugseitigen Antriebsaggregats resultierenden akustischen Störsignalen - hierunter sind insbesondere akustische Störsignale, wie z. B. drehzahlabhängige Vibrationen bestimmter harmonischer Ordnung, zu verstehen - dienenden Kompensationssignalen eingerichtet ist.The method described herein serves to operate an EOC system, which is based on system-side operating parameters, i. H. on the basis of operating parameters - as will be seen below, corresponding operating parameters are a forgetting factor λ or a step size µ (adaptation step size) of the EOC system - for generating the compensation of acoustic interference signals resulting from the operation of a motor vehicle-side drive unit - these include, in particular, acoustic interference signals such as e.g. B. speed-dependent vibrations of certain harmonic order to understand - serving compensation signals is set up.

Das verfahrensgemäß betreibbare bzw. betriebene EOC-System ist typischerweise in einem Kraftfahrzeug verbaut, in welchem es der Kompensation von aus dem Betrieb des kraftfahrzeugseitigen Antriebsaggregats, d. h. z. B. eines Verbrennungsmotors, resultierenden akustischen Störsignalen dient.The EOC system that can be operated or operated according to the method is typically installed in a motor vehicle in which it is used to compensate for H. e.g. B. an internal combustion engine, resulting acoustic noise signals is used.

Der Betrieb eines verfahrensgemäß betreibbaren bzw. betriebenen EOC-Systems umfasst grundsätzlich das Erfassen entsprechender akustischer Störsignale vermittels einer geeigneten akustischen Sensoreinrichtung bzw. dieser zugehöriger akustischer Sensorelemente - hierbei kann es sich z. B. um Mikrophone handeln - des EOC-Systems, das Erzeugen künstlicher Kompensationssignale auf Grundlage der erfassten akustischen Störsignale sowie das Ausgaben der erzeugten Kompensationssignale vermittels einer geeigneten akustischen Ausgabeeinrichtung bzw. dieser zugehöriger akustischer Ausgabeelemente - hierbei kann es sich z. B. um Lautsprecher handeln - in die Fahrgastzelle des mit dem EOC-System ausgestatteten Kraftfahrzeugs. Die Kompensationssignale bewirken, insbesondere aufgrund einer zu der Phase der jeweiligen akustischen Störsignale entgegen gesetzten Phase, eine, gegebenenfalls vollständige, Unterdrückung der akustischen Störsignale, sodass die akustischen Störsignale für Fahrzeuginsassen akustisch nicht oder kaum wahrnehmbar sind.The operation of an EOC system that can be operated or operated according to the method basically includes the detection of corresponding acoustic interference signals by means of a suitable acoustic sensor device or this associated acoustic sensor elements - this can be z. B. act around microphones - the EOC system, the generation of artificial compensation signals based on the detected acoustic interference signals and outputs the compensation signals generated by means of a suitable acoustic output device or this associated acoustic output elements - this can be z. B. to act speakers - in the passenger compartment of the vehicle equipped with the EOC system. The compensation signals cause, in particular due to a phase opposite to the phase of the respective acoustic interference signals, an optionally complete suppression of the acoustic interference signals, so that the acoustic interference signals are acoustically imperceptible or hardly perceptible to vehicle occupants.

Das Verfahren umfasst die im Weiteren näher erläuterten Schritte:
In einem ersten Schritt des Verfahrens erfolgt ein Erfassen sämtlicher über eine wenigstens ein Audioausgabeelement, d. h. z. B. einen Lautsprecher, umfassende Audioausgabeeinrichtung in einen Innenraum eines mit dem EOC-System ausgestatteten Kraftfahrzeugs, d. h. insbesondere in eine Fahrgastzelle eines mit dem EOC-System ausgestatteten Kraftfahrzeugs, auszugebender Audiosignale. Bei entsprechenden Audiosignalen handelt es sich beispielsweise um Musik- und/oder Sprachsignale. Bei entsprechenden Audiosignalen handelt es sich typischerweise nicht um seitens des EOC-Systems erzeugbare bzw. erzeugte Kompensationssignale. In dem ersten Schritt des Verfahrens werden sonach sämtliche über eine kraftfahrzeugseitige Audioausgabeeinrichtung - hierbei kann es sich z. B. um eine Entertainment- und/oder Multimediaeinrichtung zur Ausgabe von Entertainment- und/oder Multimediainhalten in den Innenraum, d. h. insbesondere in die Fahrgastzelle, des Kraftfahrzeugs handeln - respektive ein oder mehrere der Audioausgabeeinrichtung zugehörige Audioausgabeelemente erfasst. Die Erfassung der Audiosignale kann über eine hard- und/oder softwaremäßig implementierte Erfassungseinrichtung erfolgen. Die Erfassungseinrichtung kann einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.
The procedure comprises the steps explained in more detail below:
In a first step of the method, all audio output devices comprising at least one audio output element, ie e.g. a loudspeaker, are detected in an interior of a motor vehicle equipped with the EOC system, ie in particular in a passenger compartment of a motor vehicle equipped with the EOC system audio signals to be output. Corresponding audio signals are, for example, music and/or speech signals. Corresponding audio signals are typically not compensation signals that can be generated or are generated by the EOC system. In the first step of the method, therefore, all audio output devices on the motor vehicle side—this can be z. B. an entertainment and / or multimedia device for outputting entertainment and / or multimedia content in the interior, ie in particular in the passenger compartment, act of the motor vehicle - or one or more of the audio output device associated audio output elements detected. The audio signals can be detected via a detection device implemented in hardware and/or software. The detection device can form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

Die Erfassung der in den Innenraum bzw. in die Fahrgastzelle des Kraftfahrzeugs auszugebenden Audiosignale erfolgt typischerweise zeitlich vor der eigentlichen Ausgabe der Audiosignale in den Innenraum des Kraftfahrzeugs. Die Erfassung der in den Innenraum des Kraftfahrzeugs auszugebenden Audiosignale erfolgt insbesondere vor der Erfassung der Audiosignale durch die akustische Sensoreinrichtung des EOC-Systems bzw. ein dieser zugehöriges akustisches Sensorelement.The audio signals to be output into the interior or into the passenger compartment of the motor vehicle are typically detected before the actual output of the audio signals into the interior of the motor vehicle. The audio signals to be output into the interior of the motor vehicle are detected in particular before the audio signals are detected by the acoustic sensor device of the EOC system or an acoustic sensor element associated with it.

In einem zweiten Schritt des Verfahrens erfolgt ein Erzeugen eines sämtliche erfassten Audiosignale beschreibenden Summensignals. In dem zweiten Schritt des Verfahrens werden sämtliche erfassten Audiosignale sonach summiert - die Summierung kann z. B. durch eine arithmetische Summierung erfolgen - und in einem Summensignal beschrieben. Das Erzeugen des Summensignals kann sonach durch (arithmetisches) Summieren sämtlicher erfasster Audiosignale erfolgen. Das Summensignal beinhaltet sonach sämtliche erfassten Audiosignale bzw. deren Summe. Das Summensignal beinhaltet insbesondere auch sämtliche möglichen harmonischen und nicht-harmonischen Komponenten der in den Innenraum des Kraftfahrzeugs auszugebenden Audiosignale sowie sämtliche zugehörigen Audiosignalausgabeparameter, d. h. z. B. Lautstärke, Höhen, Mitten, Tiefen (Bässe), etc., und/oder Audiosignalverarbeitungsparameter, d. h. z. B. nicht-lineare Audiosignalverarbeitungsparameter, Delay, Hall, etc. Die Summierung der Audiosignale sowie die Erzeugung eines entsprechenden Summensignals kann über eine hard- und/oder softwaremäßig implementierte Summierungseinrichtung erfolgen. Die Summierungseinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a second step of the method, a sum signal describing all recorded audio signals is generated. In the second step of the method, all recorded audio signals are then summed - the summation can e.g. B. done by an arithmetic summation - and described in a sum signal. The summation signal can thus be generated by (arithmetically) summing up all of the recorded audio signals. The sum signal therefore contains all recorded audio signals or their sum. In particular, the sum signal also contains all possible harmonic and non-harmonic components of the audio signals to be output into the interior of the motor vehicle as well as all associated audio signal output parameters, i. H. e.g. B. volume, treble, middle, bass (bass), etc., and/or audio signal processing parameters, d. H. e.g. B. non-linear audio signal processing parameters, delay, reverberation, etc. The summation of the audio signals and the generation of a corresponding sum signal can be done via a summing device implemented in hardware and/or software. The summing device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

In einem dritten Schritt des Verfahrens erfolgt ein Extrahieren derjenigen spektralen Komponenten des Summensignals, deren Frequenzen den Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale entsprechen. In dem dritten Schritt des Verfahrens erfolgt sonach eine Signalverarbeitung des Summensignals dahin, dass diejenigen spektralen Komponenten des Summensignals, deren Frequenzen den Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale entsprechen, aus dem Summensignal extrahiert werden. Bei den Frequenzen der extrahierten spektralen Komponenten des Summensignals und den Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale handelt es sich sonach typischerweise um dieselben Frequenzen. Die Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale sind für jedes EOC-System typischerweise bekannt, sodass in dem dritten Schritt ein Ab- bzw. Vergleich der Frequenzen der extrahierten spektralen Komponenten des Summensignals mit den bekannten Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale erfolgt. Die Extrahierung der spektralen Komponenten des Summensignals, deren Frequenzen den Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignale entsprechen, kann über eine hard- und/oder softwaremäßig implementierte Extrahierungseinrichtung erfolgen. Die Extrahierungseinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a third step of the method, those spectral components of the sum signal are extracted whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system. In the third step of the method, the sum signal is processed in such a way that those spectral components of the sum signal whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system are extracted from the sum signal. At the frequencies of the extracted spectral components of the sum signal and the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system are therefore typically the same frequencies. The frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system are typically known for each EOC system, so that in the third step a comparison of the frequencies of the extracted spectral components of the sum signal with the known frequencies of the signals generated by the EOC -System to be compensated or compensated for acoustic interference signals. The extraction of the spectral components of the sum signal, the frequencies of which correspond to the frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system, can take place via an extraction device implemented in hardware and/or software. The extraction device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

Das Summensignal kann vor dem dritten Schritt, d. h. vor dem Extrahieren der spektralen Komponenten, gegebenenfalls vorgefiltert werden bzw. worden sein, d. h. einer vermittels einer Vorfilterungseinrichtung - hierbei kann es sich z. B. um eine Tiefpassfiltereinrichtung handeln - durchgeführten Vorfilterung unterzogen werden bzw. worden sein. Die Vorfilterung kann das Extrahieren der spektralen Komponenten gegebenenfalls vereinfachen bzw. verbessern.Before the third step, i. H. before extracting the spectral components, if necessary, are or have been pre-filtered, d. H. one by means of a pre-filtering device - this can be z. B. be a low-pass filter device - are or have been subjected to pre-filtering carried out. If necessary, the pre-filtering can simplify or improve the extraction of the spectral components.

In einem vierten Schritt des Verfahrens erfolgt ein Modifizieren der extrahierten spektralen Komponenten zur Erzeugung von modifizierten spektralen Komponenten. In dem vierten Schritt des Verfahrens werden die in dem dritten Schritt extrahierten spektralen Komponenten, d. h. die spektralen Komponenten des Summensignals, deren Frequenzen den Frequenzen der durch das EOC-System zu kompensierenden oder kompensierten akustischen Störsignalen entsprechen, sonach gezielt modifiziert bzw. verändert. Das Modifizieren kann über eine hard- und/oder softwaremäßig implementierte Modifizierungseinrichtung erfolgen. Die Modifizierungseinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a fourth step of the method, the extracted spectral components are modified to generate modified spectral components. In the fourth step of the method, the spectral components extracted in the third step, ie the spectral components of the sum signal whose frequencies correspond to the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system, are then specifically modified or changed. The modification can take place via a modification device implemented in hardware and/or software. The modification device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

In einem fünften Schritt des Verfahrens erfolgt ein Konvertieren der modifizierten spektralen Komponenten in wenigstens einen Betriebsparameter des EOC-Systems. In dem fünften Schritt des Verfahrens werden die in dem vierten Schritt erzeugten modifizierten spektralen Komponenten durch geeignete Daten- bzw. Signalverarbeitung in einen Betriebsparameter des EOC-Systems konvertiert. Der Betriebsparameter des EOC-Systems ist typischerweise durch die spektralen Komponenten beeinflussbar bzw. beeinflusst respektive beschreibbar bzw. beschrieben, sodass eine Konvertierung möglich ist. Der Betriebsparameter des EOC-Systems ist ferner typischerweise numerisch beschreibbar. Bei dem Betriebsparameter des EOC-Systems handelt es sich um den Vergessensfaktor λ oder die Schrittweite µ handeln. Dies gilt insbesondere für ein auf dem Prinzip eines LMS-Algorithmus (Least-Mean-Square-Algorithmus) betriebenen EOC-Systems. Die Konvertierung kann über eine hard- und/oder softwaremäßig implementierte Konvertierungseinrichtung erfolgen. Die Konvertierungseinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a fifth step of the method, the modified spectral components are converted into at least one operating parameter of the EOC system. In the fifth step of the method, the modified spectral components generated in the fourth step are converted into an operating parameter of the EOC system by suitable data or signal processing. The operating parameter of the EOC system can typically be influenced or influenced or described or described by the spectral components, so that a conversion is possible. The operating parameter of the EOC system is also typically describable numerically. The operating parameter of the EOC system is the forgetting factor λ or the step size µ. This applies in particular to an EOC system operated on the principle of an LMS algorithm (least mean square algorithm). The conversion can take place via a conversion device implemented in hardware and/or software. The conversion device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

In einem sechsten Schritt des Verfahrens erfolgt ein Vergleich des durch Konvertieren der modifizierten spektralen Komponenten erhaltenen Betriebsparameters des EOC-Systems mit wenigstens einem Vergleichs-Betriebsparameter bzw. Referenz-Betriebsparameter. In dem sechsten Schritt des Verfahrens erfolgt sonach ein die spätere Auswahl eines Betriebsparameters des EOC-Systems vorbereitender Vergleich des in dem fünften Schritt erhaltenen Betriebsparameters des EOC-Systems mit wenigstens einem Vergleichs-Betriebsparameter. Bei dem in dem fünften Schritt erhaltenen Betriebsparameter des EOC-Systems handelt es sich, wie erwähnt, um den Vergessensfaktor λ oder um die Schrittweite µ. Bei dem Vergleichs-Parameter kann es sich sonach z. B. um einen Vergleichs-Vergessensfaktor λ' oder um eine Vergleichs-Schrittweite µ' handeln. Der Vergleichs-Betriebsparameter ist analog dem in dem fünften Schritt erhaltenen Betriebsparameter typischerweise durch die spektralen Komponenten beeinflussbar bzw. beeinflusst respektive beschreibbar bzw. beschrieben. Ebenso ist der Vergleichs-Betriebsparameter typischerweise numerisch beschreibbar, sodass in dem sechsten Schritt des Verfahrens gegebenenfalls ein (einfacher) numerischer Vergleich von Betriebsparametern mit Vergleichs-Betriebsparametern erfolgen kann. Der Vergleich kann über eine hard- und/oder softwaremäßig implementierte Vergleichseinrichtung erfolgen. Die Vergleichseinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a sixth step of the method, the operating parameter of the EOC system obtained by converting the modified spectral components is compared with at least one comparison operating parameter or reference operating parameter. In the sixth step of the method, the subsequent selection of an operating parameter of the EOC system is compared with at least one comparison operating parameter, in preparation for the later selection of an operating parameter of the EOC system. As mentioned, the operating parameter of the EOC system obtained in the fifth step is the forgetting factor λ or the increment μ. The comparison parameter can therefore be e.g. B. be a comparison forgetting factor λ 'or a comparison increment μ'. Analogously to the operating parameter obtained in the fifth step, the comparison operating parameter can typically be influenced or influenced or described or described by the spectral components. The comparison operating parameter can also typically be described numerically, so that in the sixth step of the method a (simple) numerical comparison of operating parameters with comparison operating parameters can be carried out. The comparison can take place via a comparison device implemented in hardware and/or software. The comparison facility can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

In einem siebten Schritt des Verfahrens erfolgt eine Auswahl des den meisten (positiven) bzw. wenigsten (negativen) Einfluss auf die Leistungsfähigkeit, insbesondere die Erniedrigung bzw. Erhöhung der Leistungsfähigkeit, des EOC-Systems und/oder des den meisten (positiven) bzw. wenigsten (negativen) Einfluss auf die Stabilität bzw. Robustheit, insbesondere die Erniedrigung bzw. Erhöhung der Stabilität bzw. der Robustheit, des EOC-Systems aufweisenden Betriebsparameters auf Grundlage des Vergleichs. In dem siebten Schritt des Verfahrens wird sonach auf Grundlage des Vergleichs derjenige Betriebsparameter ausgewählt, welcher bzw. dessen (numerischer) Wert den meisten (positiven) bzw. wenigsten (negativen) Einfluss auf die Leistungsfähigkeit, insbesondere die Erniedrigung bzw. Erhöhung der Leistungsfähigkeit, des EOC-Systems und/oder den meisten (positiven) bzw. wenigsten (negativen) Einfluss auf die Stabilität bzw. Robustheit, insbesondere die Erniedrigung bzw. Erhöhung der Stabilität bzw. der Robustheit, des EOC-Systems hat. Typischerweise wird derjenige Betriebsparameter ausgewählt, welcher eine (maximale) Erhöhung der Stabilität des EOC-Systems bedingt, welche gegebenenfalls mit einer Reduzierung der Leistungsfähigkeit des EOC-Systems einhergehen kann. Bei dem ausgewählten Betriebsparameter des EOC-Systems handelt es sich um einen Vergessensfaktor λ oder um eine Schrittweite µ handeln. Die Auswahl des Betriebsparameters erfolgt dabei insbesondere mit der Maßgabe, dass die Stabilität bzw. Robustheit des EOC-Systems unter den gegebenen akustischen Bedingungen möglichst wenig negativ beeinflusst, d. h. möglichst wenig reduziert, bzw. möglichst positiv beeinflusst, d. h. möglichst erhöht, wird. Die Auswahl kann über eine hard- und/oder softwaremäßig implementierte Auswahleinrichtung erfolgen. Die Auswahleinrichtung kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems bilden.In a seventh step of the method, the most (positive) or least (negative) influence on the performance, in particular the reduction or increase in the performance, of the EOC system and/or the most (positive) or least (negative) influence on the stability or robustness, in particular the reduction or increase in the stability or the robustness, of the operating parameter having the EOC system on the basis of the comparison. In the seventh step of the method, based on the comparison, that operating parameter is selected which or its (numerical) value has the most (positive) or least (negative) influence on the performance, in particular the reduction or increase in performance, of the EOC system and/or has the most (positive) or least (negative) influence on the stability or robustness, in particular the reduction or increase in stability or robustness, of the EOC system. Typically, that operating parameter is selected which causes a (maximum) increase in the stability of the EOC system, which can possibly be accompanied by a reduction in the performance of the EOC system. The selected operating parameter of the EOC system is a forgetting factor λ or an increment µ. The operating parameters are selected in particular with the proviso that the stability or robustness of the EOC system under the given acoustic conditions is influenced as little as possible, i. H. reduced as little as possible or influenced as positively as possible, d. H. increased as possible. The selection can be made via a selection device implemented in hardware and/or software. The selection device can also form a hardware and/or software-implemented functional component of the EOC system or a control device of the EOC system.

In dem siebten Schritt des Verfahrens kann z. B. der den geringsten oder höchsten Wert aufweisende Betriebsparameter ausgewählt werden. Die Auswahl eines den geringsten Wert aufweisenden Betriebsparameters gilt insbesondere für den Vergessensfaktor λ als Beispiel für einen Betriebsparameter respektive den Vergleich eines Vergessensfaktor λ mit einem Vergleichs-Vergessensfaktor λ'.In the seventh step of the method, e.g. B. the operating parameter having the lowest or highest value can be selected. The selection of an operating parameter with the lowest value applies in particular to the forgetting factor λ as an example of an operating parameter or the comparison of a forgetting factor λ with a comparison forgetting factor λ′.

In einem achten Schritt des Verfahrens wird das EOC-System schließlich unter Anwendung des ausgewählten Betriebsparameters betrieben. Der ausgewählte Betriebsparameter wird sonach der Erzeugung entsprechender Kompensationssignale zugrunde gelegt. Die Ausgabe der Kompensationssignale kann prinzipiell über wenigstens ein dem EOC-System zugehöriges Ausgabeelement und/oder über Audioausgabeelemente der Audioausgabeeinrichtung erfolgen. In letzterem Fall können die Kompensationssignale dem über die Audioausgabeelemente der Audioausgabeeinrichtung auszugebenden bzw. ausgegebenen Audiosignal zugemischt werden.Finally, in an eighth step of the method, the EOC system is operated using the selected operating parameter. The selected operating parameter is then used as a basis for generating corresponding compensation signals. In principle, the compensation signals can be output via at least one output element associated with the EOC system and/or via audio output elements of the audio output device. In the latter case, the compensation signals can be added to the audio signal to be output or output via the audio output elements of the audio output device.

Das beschriebene Verfahren erlaubt einen stabile(re)n bzw. robuste(re)n Betrieb eines EOC-Systems; es liegt damit ein verbessertes Verfahren zum Betrieb eines EOC-Systems vor. Wie erwähnt, kann vor dem in dem dritten Schritt erfolgenden Erfassen der spektralen Komponenten des Summensignals eine Vorfilterung durchgeführt werden. Die Vorfilterung kann insbesondere dazu dienen, Frequenzbereiche des Summensignals zu filtern, d. h. insbesondere zu entfernen, welche nicht dem Frequenzbereich, in welchem das EOC-System Kompensationssignale erzeugt, entsprechen. Die verwendete Vorfilterungseinrichtung kann sonach insbesondere dazu eingerichtet sein, Frequenzbereiche des Summensignals zu filtern, d. h. insbesondere zu entfernen, welche nicht dem Frequenzbereich, in welchem das EOC-System Kompensationssignale erzeugt, entsprechen.The method described allows a (more) stable or (more) robust operation of an EOC system; there is thus an improved method for operating an EOC system. As mentioned, before the spectral components of the sum signal are detected in the third step, pre-filtering can be carried out. The pre-filtering can be used in particular to filter frequency ranges of the sum signal, i. H. in particular to remove those which do not correspond to the frequency range in which the EOC system generates compensation signals. The pre-filtering device used can therefore be set up in particular to filter frequency ranges of the sum signal, i. H. in particular to remove those which do not correspond to the frequency range in which the EOC system generates compensation signals.

Das Modifizieren der erfassten spektralen Komponenten zur Erzeugung von modifizierten spektralen Komponenten kann durch Erzeugung einer zusätzlichen Eingangsverstärkung, d. h. eines zusätzlichen Gains, im Bereich eines ersten (lokalen) Anstiegs der jeweiligen spektralen Komponente(n) in der Zeitdomäne erfolgen. Die erfassten spektralen Komponenten können sonach durch eine gezielt erzeugte Verstärkung im Bereich eines ersten Anstiegs der jeweiligen spektralen Komponente in der Zeitdomäne erfolgen. An dieser Stelle ist allgemein zu erwähnen, dass es sich bei den spektralen Komponenten typischerweise um ein als Funktion der Zeit, d. h. in der Zeitdomäne, aufgetragenes Frequenzspektrum handelt. Insbesondere ist hierunter eine Änderung der extrahierten spektralen Komponenten über der Zeit zu verstehen.The modification of the detected spectral components to generate modified spectral components can be done by generating an additional input amplification, ie an additional gain, in the area of a first (local) increase in the respective spectral component(s) in the time domain. The detected spectral components can therefore be generated by a specifically generated amplification in the area of a first increase in the respective spectral component in the time domain. At this point it should be mentioned in general that the spectral components are typically is a frequency spectrum plotted as a function of time, ie in the time domain. In particular, this means a change in the extracted spectral components over time.

Das Modifizieren der erfassten spektralen Komponenten zur Erzeugung von modifizierten spektralen Komponenten kann alternativ oder ergänzend durch zeitliche Verlängerung der spektralen Komponenten im Bereich eines (lokalen) Abstiegs, insbesondere eines auf einen (lokalen) Anstieg folgenden Abstiegs, der spektralen Komponenten in der Zeitdomäne erfolgen. Die erfassten spektralen Komponenten können sonach durch eine gezielt erzeugte Verlängerung (Dehnung) im Bereich eines entsprechenden Abstiegs der jeweiligen spektralen Komponente in der Zeitdomäne erfolgen.The modification of the recorded spectral components to generate modified spectral components can alternatively or additionally be done by lengthening the time of the spectral components in the area of a (local) decrease, in particular a decrease following a (local) increase, of the spectral components in the time domain. The detected spectral components can therefore be produced by a specifically generated lengthening (stretching) in the area of a corresponding descent of the respective spectral component in the time domain.

Die zeitliche Verlängerung des Abstiegs der jeweiligen spektralen Komponente(n) kann z. B. einem durch die Dauer einer Impulsantwort, d. h. insbesondere einer Raumimpulsantwort, eines dem EOC-System bzw. einer dem EOC-System zugehörigen akustischen Sensoreinrichtung zugehörigen akustischen Sensorelements, d. h. z. B. einem Mikrophon, nach einem in den Innenraum emittierten Audiosignal bestimmten Zeitintervall entsprechen. Insbesondere kann die zeitliche Verlängerung des Abstiegs ihrem zeitlichen Verlauf nach einer Hüllkurve um einen Signalverlauf der bzw. einer Impulsantwort, d. h. insbesondere einer Raumimpulsantwort, einer dem EOC-System zugehörigen akustischen Sensoreinrichtung bzw. eines einer solchen zugehörigen akustischen Sensorelements nach einem in den Innenraum emittierten Audiosignal bestimmten Zeitintervall entsprechen.The time extension of the descent of the respective spectral component (s) can z. B. a by the duration of an impulse response, d. H. in particular a room impulse response, an acoustic sensor element associated with the EOC system or an acoustic sensor device associated with the EOC system, d. H. e.g. B. a microphone, according to an audio signal emitted into the interior correspond to a certain time interval. In particular, the lengthening of the descent over time can follow an envelope curve by a signal curve of the or an impulse response, d. H. correspond in particular to a room impulse response, an acoustic sensor device associated with the EOC system or an acoustic sensor element associated with such an acoustic sensor element after a certain time interval emitted into the interior of the vehicle.

Die spektralen Komponenten können beispielsweise einen rechteckförmigen (zeitlichen) Verlauf mit einem zu einem bestimmten Zeitpunkt von einem Referenzwert erfolgenden, insbesondere plötzlichen, Anstieg auf einen Plateauwert, einen gewissen zeitlichen, im Wesentlichen konstanten Verlauf auf dem Plateauwert und einen zu einem bestimmten Zeitpunkt von dem Plateauwert erfolgenden, insbesondere plötzlichen, Abstieg auf den Referenzwert aufweisen. Andere spektrale Verläufe sind grundsätzlich denkbar.The spectral components can, for example, have a rectangular (temporal) profile with a particular sudden rise from a reference value to a plateau value at a specific point in time, a specific temporal, essentially constant profile on the plateau value and a specific point in time from the plateau value occurring, in particular sudden, descent to the reference value. Other spectral curves are fundamentally conceivable.

Das Modifizieren von einen entsprechenden rechteckartigen bzw. -förmigen Verlauf aufweisenden spektralen Komponenten kann entsprechend durch Erzeugung einer zusätzlichen Eingangsverstärkung, d. h. eines zusätzlichen Gains, im Bereich des ersten Anstiegs erfolgen. Alternativ oder ergänzend kann das Modifizieren von einen solchen rechteckartigen bzw. -förmigen Verlauf aufweisenden spektralen Komponenten entsprechend durch Verlängerung bzw. Dehnung im Bereich des Abstiegs erfolgen. Analoges gilt für spektrale Komponenten, welche im Vergleich zu rechteckartigen bzw. - förmigen Verläufen andersartige Verläufe aufweisen.The modification of spectral components exhibiting a corresponding rectangular or square-shaped course can be carried out accordingly by generating an additional input amplification, ie an additional gain, in the area of the first increase. Alternatively or additionally, the modification of spectral components exhibiting such a rectangular or rectangular course can be carried out accordingly by lengthening or stretching in the region of the descent. The same applies to spectral components which have different types of profiles in comparison to rectangular or rectangular profiles.

Wie erwähnt, erfolgt die Erfassung der in den Innenraum des Kraftfahrzeugs auszugebenden Audiosignale insbesondere vor der Erfassung der Audiosignale durch die akustische Sensoreinrichtung des EOC-Systems. Das Erfassen und Zusammenfassen sämtlicher über die Audioausgabeeinrichtung auszugebender Audiosignale erfolgt sonach insbesondere bevor die Audiosignale tatsächlich über die Audioausgabeeinrichtung in den Innenraum des mit dem verfahrensgemäß betriebenen bzw. betreibbaren EOC-System ausgestatteten Kraftfahrzeugs ausgegeben werden. Das Erfassen und Zusammenfassen sämtlicher über die Audioausgabeeinrichtung auszugebender Audiosignale erfolgt sonach insbesondere bevor die Audiosignale tatsächlich akustisch wahrnehmbar, d. h. insbesondere hörbar, für einen in dem Innenraum des mit dem verfahrensgemäß betriebenen bzw. betreibbaren EOC-System ausgestatteten Kraftfahrzeugs befindlichen Fahrzeuginsassen in den Innenraum ausgegeben werden.As mentioned, the audio signals to be output into the interior of the motor vehicle are detected in particular before the audio signals are detected by the acoustic sensor device of the EOC system. The recording and summarizing of all audio signals to be output via the audio output device therefore takes place in particular before the audio signals are actually output via the audio output device into the interior of the motor vehicle equipped with the EOC system operated or operable according to the method. The recording and summarizing of all audio signals to be output via the audio output device therefore takes place in particular before the audio signals are actually acoustically perceptible, i. H. in particular audibly, for a vehicle occupant located in the interior of the motor vehicle equipped with the EOC system operated or operable according to the method.

Die Erfindung betrifft neben dem Verfahren auch ein EOC-System für ein Karaftfahrzeug nach Anspruch 8, welches zur Erzeugung von der Kompensation von aus dem Betrieb des bzw. eines kraftfahrzeugseitigen Antriebsaggregats resultierenden akustischen Störsignalen dienenden Kompensationssignalen eingerichtet ist. Das EOC-System ist zur Durchführung des Verfahrens eingerichtet. Sämtliche Ausführungen im Zusammenhang mit dem Verfahren gelten analog für das EOC-System. Das EOC-System umfasst sonach insbesondere die im Zusammenhang mit dem Verfahren erwähnten funktionellen Bestandteile, d. h. insbesondere die hard- und/oder softwaremäßig implementierten Einrichtungen, des EOC-Systems bzw. einer Steuereinrichtung des EOC-Systems. Alternativ kommuniziert das EOC-System bzw. eine Steuereinrichtung des EOC-Systems mit den im Zusammenhang mit dem Verfahren erwähnten funktionellen Bestandteilen, d. h. insbesondere den hard- und/oder softwaremäßig implementierten Einrichtungen, des EOC-Systems.In addition to the method, the invention also relates to an EOC system for a motor vehicle according to claim 8, which is set up to generate compensation signals serving to compensate for acoustic interference signals resulting from the operation of the or a motor vehicle drive unit. The EOC system is set up to carry out the method. All statements in connection with the procedure apply analogously to the EOC system. The EOC system therefore includes in particular the functional components mentioned in connection with the method, ie in particular the devices implemented in terms of hardware and/or software, of the EOC system or a control device of the EOC system. Alternatively, the EOC system or a control device of the EOC system communicates with the functional components mentioned in connection with the method, ie in particular the hardware and/or software implemented devices of the EOC system.

Die Erfindung betrifft ferner ein Kraftfahrzeug, d. h. insbesondere einen Personenkraftwagen, welches wenigstens ein wie hierin beschriebenes EOC-System umfasst. Sämtliche Ausführungen im Zusammenhang mit dem Verfahren gelten sonach auch analog für das Kraftfahrzeug.The invention also relates to a motor vehicle, i. H. in particular a passenger car, which comprises at least one EOC system as described herein. All statements in connection with the method therefore also apply analogously to the motor vehicle.

Ausführungsbeispiele der Erfindung sind in den Zeichnungsfiguren näher erläutert. Dabei zeigt:

Fig. 1
eine Prinzipdarstellung eines Flussdiagramms zur Veranschaulichung eines Verfahrens gemäß einem Ausführungsbeispiel;
Fig. 2
eine Prinzipdarstellung eines EOC-Systems gemäß einem Ausführungsbeispiel; und
Fig. 3
eine Prinzipdarstellung eines zeitlichen Verlaufs spektraler Komponenten gemäß einem Ausführungsbeispiel.
Embodiments of the invention are explained in more detail in the drawing figures. It shows:
1
a basic representation of a flowchart to illustrate a method according to an embodiment;
2
a schematic diagram of an EOC system according to an embodiment; and
3
a schematic representation of a time course of spectral components according to an embodiment.

Fig. 1 zeigt eine Prinzipdarstellung eines Flussdiagramms zur Veranschaulichung eines Verfahrens gemäß einem Ausführungsbeispiel. Das Verfahren dient dem Betrieb eines EOC-Systems 1, welches auf Grundlage bzw. unter Anwendung von systemseitigen Betriebsparametern, wie einem Vergessensfaktor λ sowie einer Schrittweite µ, zur Erzeugung von der Kompensation von aus dem Betrieb eines kraftfahrzeugseitigen Antriebsaggregats 2 resultierenden akustischen Störsignalen 3 dienenden Kompensationssignalen 4 eingerichtet ist. 1 shows a basic representation of a flowchart to illustrate a method according to an embodiment. The method is used to operate an EOC system 1, which, on the basis of or using system-side operating parameters, such as a forgetting factor λ and an increment μ, is used to generate compensation signals that serve to compensate for acoustic interference signals 3 resulting from the operation of a motor vehicle drive unit 2 4 is set up.

Wie anhand von Fig. 2, welche eine Prinzipdarstellung eines EOC-Systems 1 gemäß einem Ausführungsbeispiel zeigt, ersichtlich ist, ist das verfahrensgemäß betreibbare bzw. betriebene EOC-System 1 in einem Kraftfahrzeug 5 verbaut, in welchem es der Kompensation von aus dem Betrieb des kraftfahrzeugseitigen Antriebsaggregats 2, d. h. z. B. eines Verbrennungsmotors, resultierenden akustischen Störsignalen 3 - hierunter sind typischerweise drehzahlabhängige Vibrationen bestimmter harmonischer Ordnung zu verstehen - dient.How based on 2 , which shows a schematic representation of an EOC system 1 according to an exemplary embodiment, the EOC system 1 that can be operated or operated according to the method is installed in a motor vehicle 5, in which it is used to compensate for from the operation of the drive unit 2 on the motor vehicle, ie e.g .

Der Betrieb des EOC-Systems 1 umfasst grundsätzlich das Erfassen entsprechender akustischer Störsignale 3 vermittels einer geeigneten akustischen Sensoreinrichtung 6 bzw. dieser zugehöriger akustischer Sensorelemente 7 - hierbei kann es sich z. B. um Mikrophone handeln - des EOC-Systems 1, das Erzeugen künstlicher Kompensationssignale 4 auf Grundlage der erfassten akustischen Störsignale 3 sowie das Ausgaben der erzeugten Kompensationssignale 4 vermittels einer geeigneten akustischen Ausgabeeinrichtung 9 bzw. dieser zugehöriger akustischer Ausgabeelemente 10 - hierbei kann es sich z. B. um Lautsprecher handeln - in die Fahrgastzelle 8 des mit dem EOC-System 1 ausgestatteten Kraftfahrzeugs 5. Die Kompensationssignale 4 bewirken, insbesondere aufgrund einer zu der Phase der jeweiligen akustischen Störsignale 3 entgegen gesetzten Phase, eine, gegebenenfalls vollständige, Unterdrückung der akustischen Störsignale 3, sodass die akustischen Störsignale 3 für Fahrzeuginsassen akustisch nicht oder kaum wahrnehmbar sind.The operation of the EOC system 1 basically includes the detection of corresponding acoustic interference signals 3 by means of a suitable acoustic sensor device 6 or acoustic sensor elements 7 associated with it. B. act around microphones - of the EOC system 1, the generation of artificial compensation signals 4 on the basis of the detected acoustic interference signals 3 and the outputs of the generated compensation signals 4 by means of a suitable acoustic output device 9 or this associated acoustic output elements 10 - this can be z . B. are speakers - in the passenger compartment 8 of the motor vehicle 5 equipped with the EOC system 1. The compensation signals 4 cause, in particular due to a phase opposite to the phase of the respective acoustic interference signals 3, an optionally complete suppression of the acoustic interference signals 3, so that the acoustic interference signals 3 are acoustically imperceptible or hardly perceptible to vehicle occupants.

Das Verfahren umfasst die im Weiteren näher erläuterten Schritte:
In einem ersten Schritt S1 des Verfahrens erfolgt ein Erfassen sämtlicher über eine ein oder mehrere Audioausgabeelemente 11 - hierbei kann es sich z. B. um Lautsprecher handeln - umfassende Audioausgabeeinrichtung 12 in die Fahrgastzelle 8 des mit dem EOC-System 1 ausgestatteten Kraftfahrzeugs 5 auszugebender Audiosignale 13. Bei den Audiosignalen 13 handelt es sich beispielsweise um Musik- und/oder Sprachsignale. Bei den Audiosignalen 13 handelt es sich nicht um die seitens des EOC-Systems 1 erzeugbaren bzw. erzeugten Kompensationssignale 4. In dem ersten Schritt S1 werden sonach sämtliche über die kraftfahrzeugseitige Audioausgabeeinrichtung 12 - hierbei kann es sich z. B. um eine Entertainment- und/oder Multimediaeinrichtung zur Ausgabe von Entertainment- und/oder Multimediainhalten in die Fahrgastzelle 8 des Kraftfahrzeugs 5 handeln - respektive über die der Audioausgabeeinrichtung 12 zugehörigen Audioausgabeelemente 11 erfasst. Die Erfassung der Audiosignale 13 erfolgt über eine hard- und/oder softwaremäßig implementierte Erfassungseinrichtung 14. Die Erfassungseinrichtung 14 kann einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.
The procedure comprises the steps explained in more detail below:
In a first step S1 of the method, all of the audio output elements 11 via one or more audio output elements are detected—this can be z. B. be speakers - comprehensive audio output device 12 in the passenger compartment 8 of equipped with the EOC system 1 motor vehicle 5 audio signals 13 to be output. The audio signals 13 are, for example, music and / or voice signals. The audio signals 13 are not the compensation signals 4 that can be generated or are generated by the EOC system 1. B. be an entertainment and / or multimedia device for outputting entertainment and / or multimedia content in the passenger compartment 8 of the motor vehicle 5 act - or detected via the audio output device 12 associated audio output elements 11. The audio signals 13 are detected via a detection device 14 implemented in hardware and/or software. The detection device 14 can form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .

Die Erfassung der in die Fahrgastzelle 8 auszugebenden Audiosignale 13 erfolgt zeitlich vor der eigentlichen Ausgabe der Audiosignale 13 in die Fahrgastzelle 8. Die Erfassung der in die Fahrgastzelle 8 auszugebenden Audiosignale 13 erfolgt insbesondere vor der Erfassung der Audiosignale 13 durch die akustische Sensoreinrichtung 6 des EOC-Systems 1 bzw. die dieser zugehörigen akustischen Sensorelemente 7.The audio signals 13 to be output into the passenger compartment 8 are detected before the actual output of the audio signals 13 into the passenger compartment 8. The audio signals 13 to be output into the passenger compartment 8 are detected in particular before the audio signals 13 are detected by the acoustic sensor device 6 of the EOC System 1 or the associated acoustic sensor elements 7.

In einem zweiten Schritt S2 des Verfahrens erfolgt ein Erzeugen eines sämtliche erfassten Audiosignale 13 beschreibenden Summensignals 15. In dem zweiten Schritt S2 werden sämtliche erfassten Audiosignale 13 sonach summiert - die Summierung kann z. B. durch eine arithmetische Summierung erfolgen - und in einem Summensignal 15 beschrieben. Das Erzeugen des Summensignals 15 kann sonach durch (arithmetisches) Summieren sämtlicher erfasster Audiosignale 13 erfolgen. Das Summensignal 15 beinhaltet sonach sämtliche erfassten Audiosignale 13 bzw. deren Summe. Das Summensignal 15 beinhaltet insbesondere auch sämtliche möglichen harmonischen und nicht-harmonischen Komponenten der Audiosignale 13 sowie sämtliche zugehörigen Audiosignalausgabeparameter, d. h. z. B. Lautstärke, Höhen, Mitten, Tiefen (Bässe), etc., und/oder Audiosignalverarbeitungsparameter, d. h. z. B. nicht-lineare Audiosignalverarbeitungsparameter, Delay, Hall, etc. Die Summierung der Audiosignale 13 sowie die Erzeugung des Summensignals 15 erfolgt über eine hard- und/oder softwaremäßig implementierte Summierungseinrichtung 16. Die Summierungseinrichtung 16 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a second step S2 of the method, a sum signal 15 describing all recorded audio signals 13 is generated. B. done by an arithmetic summation - and described in a sum signal 15. The summation signal 15 can therefore be generated by (arithmetically) summing up all of the recorded audio signals 13 . The sum signal 15 therefore contains all recorded audio signals 13 or their sum. Sum signal 15 also contains in particular all possible harmonic and non-harmonic components of audio signals 13 and all associated audio signal output parameters, i. H. e.g. B. volume, treble, middle, bass (bass), etc., and/or audio signal processing parameters, d. H. e.g. B. non-linear audio signal processing parameters, delay, reverberation, etc. The summation of the audio signals 13 and the generation of the sum signal 15 takes place via a hardware and/or software implemented summation device 16. The summation device 16 can also be implemented in hardware and/or software form a functional component of the EOC system 1 or a control device 28 of the EOC system 1 .

In einem dritten Schritt S3 des Verfahrens erfolgt ein Extrahieren derjenigen spektralen Komponenten des Summensignals 15, deren Frequenzen den Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale 3 entsprechen. In dem dritten Schritt S3 erfolgt sonach eine Signalverarbeitung des Summensignals 15 dahin, dass diejenigen spektralen Komponenten des Summensignals 15, deren Frequenzen den Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale 3 entsprechen, aus dem Summensignal 15 extrahiert werden. Bei den Frequenzen der extrahierten spektralen Komponenten des Summensignals 15 und den Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale 3 handelt es sich sonach typischerweise um dieselben Frequenzen. Die Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale sind für das EOC-System 1 bekannt, sodass in dem dritten Schritt S3 ein Ab- bzw. Vergleich der Frequenzen der extrahierten spektralen Komponenten des Summensignals 15 mit den bekannten Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale 3 erfolgt. Die Extrahierung der spektralen Komponenten des Summensignals 15, deren Frequenzen den Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignale 3 entsprechen, erfolgt über eine hard- und/oder softwaremäßig implementierte Extrahierungseinrichtung 17. Die Extrahierungseinrichtung 17 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a third step S3 of the method, those spectral components of the sum signal 15 are extracted whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 . In the third step S3, signal processing of the sum signal 15 takes place in such a way that those spectral components of the sum signal 15 whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated by the EOC system 1 are extracted from the sum signal 15. The frequencies of the extracted spectral components of the sum signal 15 and the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 are therefore typically same frequencies. The frequencies of the acoustic interference signals to be compensated or compensated for by the EOC system 1 are known for the EOC system 1, so that in the third step S3 a comparison of the frequencies of the extracted spectral components of the sum signal 15 with the known frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1 . The extraction of the spectral components of the sum signal 15, the frequencies of which correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated for by the EOC system 1, takes place via an extraction device 17 implemented in hardware and/or software. The extraction device 17 can also have a hardware and/or a functional component of the EOC system 1 implemented in terms of software or a control device 28 of the EOC system 1.

Das Summensignal 15 wird vor dem Extrahieren der spektralen Komponenten vorgefiltert (optional), d. h. einer vermittels einer Vorfilterungseinrichtung 18 - hierbei kann es sich z. B. um eine Tiefpassfiltereinrichtung handeln - durchgeführten Vorfilterung unterzogen. Die Vorfilterung kann insbesondere dazu dienen, Frequenzbereiche des Summensignals 15 zu filtern, welche nicht dem Frequenzbereich, in welchem das EOC-System 1 Kompensationssignale erzeugt, entsprechen. Die Vorfilterungseinrichtung 18 kann sonach insbesondere dazu eingerichtet sein, Frequenzbereiche des Summensignals 15 zu filtern, welche nicht dem Frequenzbereich, in welchem das EOC-System 1 Kompensationssignale erzeugt, entsprechen.The sum signal 15 is pre-filtered (optional) before extracting the spectral components, i. H. one by means of a pre-filtering device 18 - this can be z. B. be a low-pass filter device - subjected to pre-filtering carried out. The pre-filtering can be used in particular to filter frequency ranges of the sum signal 15 which do not correspond to the frequency range in which the EOC system 1 generates compensation signals. The pre-filtering device 18 can therefore be set up in particular to filter frequency ranges of the sum signal 15 which do not correspond to the frequency range in which the EOC system 1 generates compensation signals.

In einem vierten Schritt S4 des Verfahrens erfolgt ein Modifizieren der extrahierten spektralen Komponenten zur Erzeugung von modifizierten spektralen Komponenten. In dem vierten Schritt S4 werden die in dem dritten Schritt S3 extrahierten spektralen Komponenten, d. h. die spektralen Komponenten des Summensignals 15, deren Frequenzen den Frequenzen der durch das EOC-System 1 zu kompensierenden oder kompensierten akustischen Störsignalen 3 entsprechen, sonach gezielt modifiziert bzw. verändert. Das Modifizieren erfolgt über eine hard- und/oder softwaremäßig implementierte Modifizierungseinrichtung 19. Die Modifizierungseinrichtung 19 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a fourth step S4 of the method, the extracted spectral components are modified to generate modified spectral components. In the fourth step S4, the spectral components extracted in the third step S3, ie the spectral components of the sum signal 15, whose frequencies correspond to the frequencies of the acoustic interference signals 3 to be compensated or compensated by the EOC system 1, are then specifically modified or changed . The modification takes place via a modification device 19 implemented in hardware and/or software. The modification device 19 can also form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .

In einem fünften Schritt S5 des Verfahrens erfolgt ein Konvertieren der modifizierten spektralen Komponenten in wenigstens einen Betriebsparameter des EOC-Systems 1. In dem fünften Schritt S5 werden die in dem vierten Schritt S4 erzeugten modifizierten spektralen Komponenten durch geeignete Daten- bzw. Signalverarbeitung in einen Betriebsparameter des EOC-Systems 1 konvertiert. Der Betriebsparameter des EOC-Systems 1 ist typischerweise durch die spektralen Komponenten beeinflussbar bzw. beeinflusst respektive beschreibbar bzw. beschrieben, sodass eine Konvertierung möglich ist. Der Betriebsparameter des EOC-Systems 1 ist ferner typischerweise numerisch beschreibbar. Bei dem Betriebsparameter des EOC-Systems 1 handelt es sich um den Vergessensfaktor λ oder die Schrittweite µ. Die Konvertierung erfolgt über eine hard- und/oder softwaremäßig implementierte Konvertierungseinrichtung 20. Die Konvertierungseinrichtung 20 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a fifth step S5 of the method, the modified spectral components are converted into at least one operating parameter of the EOC system 1. In the fifth step S5, the modified spectral components generated in the fourth step S4 are converted into an operating parameter by suitable data or signal processing of the EOC system 1 converted. The operating parameter of the EOC system 1 can typically be influenced or influenced or described or described by the spectral components, so that a conversion is possible. The operating parameter of the EOC system 1 can also typically be described numerically. The operating parameter of the EOC system 1 is the forgetting factor λ or the increment μ. The conversion takes place via a hardware and/or software implemented conversion device 20. The conversion device 20 can also form a hardware and/or software implemented functional component of the EOC system 1 or a control device 28 of the EOC system 1.

In einem sechsten Schritt S6 des Verfahrens erfolgt ein Vergleich des durch Konvertieren der modifizierten spektralen Komponenten erhaltenen Betriebsparameters des EOC-Systems 1 mit wenigstens einem Vergleichs-Betriebsparameter bzw. Referenz-Betriebsparameter. In dem sechsten Schritt S6 erfolgt sonach ein die spätere Auswahl eines Betriebsparameters des EOC-Systems 1 vorbereitender Vergleich des in dem fünften Schritt S5 erhaltenen Betriebsparameters des EOC-Systems 1 mit wenigstens einem Vergleichs-Betriebsparameter. Bei dem in dem fünften Schritt S5 erhaltenen Betriebsparameter des EOC-Systems 1 handelt es sich, wie erwähnt, um den Vergessensfaktor λ oder um die Schrittweite µ. Bei dem Vergleichs-Parameter kann es sich sonach z. B. um einen Vergleichs-Vergessensfaktor λ' oder um eine Vergleichs-Schrittweite µ' handeln. Der Vergleichs-Betriebsparameter ist analog dem in dem fünften Schritt S5 erhaltenen Betriebsparameter typischerweise durch die spektralen Komponenten beeinflussbar bzw. beeinflusst respektive beschreibbar bzw. beschrieben. Ebenso ist der Vergleichs-Betriebsparameter typischerweise numerisch beschreibbar, sodass in dem sechsten Schritt S6 gegebenenfalls ein (einfacher) numerischer Vergleich von Betriebsparametern mit Vergleichs-Betriebsparametern erfolgen kann. Der Vergleich erfolgt über eine hard- und/oder softwaremäßig implementierte Vergleichseinrichtung 21. Die Vergleichseinrichtung 21 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a sixth step S6 of the method, the operating parameter of the EOC system 1 obtained by converting the modified spectral components is compared with at least one comparison operating parameter or reference operating parameter. In the sixth step S6, the subsequent selection of an operating parameter of the EOC system 1 is then compared in preparation for the operating parameter of the EOC system 1 obtained in the fifth step S5 with at least one comparison operating parameter. As mentioned, the operating parameter of the EOC system 1 obtained in the fifth step S5 is the forgetting factor λ or the increment μ. The comparison parameter can therefore be e.g. B. be a comparison forgetting factor λ 'or a comparison increment μ'. Analogously to the operating parameter obtained in the fifth step S5, the comparison operating parameter can typically be influenced or influenced or described or described by the spectral components. The comparison operating parameter can also typically be described numerically, so that a (simple) numerical comparison of operating parameters with comparison operating parameters can be carried out in the sixth step S6. The comparison takes place via a comparison device 21 implemented in hardware and/or software. The comparison device 21 can also form a hardware and/or software-implemented functional component of the EOC system 1 or a control device 28 of the EOC system 1 .

In einem siebten Schritt S7 des Verfahrens erfolgt eine Auswahl des den meisten positiven bzw. wenigsten negativen Einfluss auf die Leistungsfähigkeit des EOC-Systems 1 und/oder des den meisten positiven bzw. wenigsten negativen Einfluss auf die Stabilität bzw. Robustheit des EOC-Systems 1 respektive die Stabilität bzw. Robustheit des Betriebs des EOC-Systems 1 aufweisenden Betriebsparameters auf Grundlage des Vergleichs. In dem siebten Schritt S7 wird sonach auf Grundlage des Vergleichs derjenige Betriebsparameter ausgewählt, welcher bzw. dessen (numerischer) Wert, den meisten positiven bzw. wenigsten negativen Einfluss auf die Leistungsfähigkeit des EOC-Systems 1 und/oder den meisten positiven bzw. wenigsten negativen Einfluss auf die Stabilität bzw. Robustheit des EOC-Systems 1 hat. Bei dem ausgewählten Betriebsparameter des EOC-Systems 1 handelt es sich in den in den Fig. gezeigten Ausführungsbeispielen um den Vergessensfaktor λ oder um die Schrittweite µ. Die Auswahl des Betriebsparameters erfolgt dabei insbesondere mit der Maßgabe, dass die Stabilität bzw. Robustheit des EOC-Systems 1 unter den gegebenen akustischen Bedingungen möglichst wenig negativ beeinflusst, d. h. möglichst wenig reduziert, bzw. möglichst positiv beeinflusst, d. h. möglichst erhöht, wird. Die Auswahl erfolgt über eine hard- und/oder softwaremäßig implementierte Auswahleinrichtung 22. Die Auswahleinrichtung 22 kann ebenso einen hard- und/oder softwaremäßig implementierten funktionellen Bestandteil des EOC-Systems 1 bzw. einer Steuereinrichtung 28 des EOC-Systems 1 bilden.In a seventh step S7 of the method, the most positive or least negative influence on the performance of the EOC system 1 and/or the most positive or least negative influence on the stability or robustness of the EOC system 1 is selected respectively the stability or robustness of the operation of the EOC system 1 having operating parameters on the basis of the comparison. In the seventh step S7, based on the comparison, that operating parameter is then selected which or its (numerical) value has the most positive or least negative influence on the performance of the EOC system 1 and/or the most positive or least negative Influence on the stability or robustness of the EOC system 1 has. In the exemplary embodiments shown in the figures, the selected operating parameter of the EOC system 1 is the forgetting factor λ or the increment μ. The operating parameters are selected in particular with the proviso that the stability or robustness of the EOC system 1 under the given acoustic conditions is influenced as little as possible, i. H. reduced as little as possible or influenced as positively as possible, d. H. increased as possible. The selection is made via a selection device 22 implemented in hardware and/or software. The selection device 22 can also form a functional component of the EOC system 1 implemented in hardware and/or software or a control device 28 of the EOC system 1 .

In dem siebten Schritt S7 Verfahrens kann z. B. der den geringsten oder höchsten Wert aufweisende Betriebsparameter ausgewählt werden. Die Auswahl eines den geringsten Wert aufweisenden Betriebsparameters gilt insbesondere für den Vergessensfaktor λ, da ein einen möglichst geringen Wert aufweisender Vergessensfaktor λ typischerweise einen möglichst stabilen Betrieb des EOC-Systems 1 erlaubt.In the seventh step S7 method z. B. the operating parameter having the lowest or highest value can be selected. The selection of an operating parameter that has the lowest value applies in particular to the forgetting factor λ, since a forgetting factor λ that has the lowest possible value typically allows the EOC system 1 to operate as stably as possible.

In einem achten Schritt S8 des Verfahrens wird das EOC-System 1 schließlich unter Anwendung des ausgewählten Betriebsparameters betrieben. Der ausgewählte Betriebsparameter wird sonach der im Betrieb des EOC-Systems 1 erfolgenden Erzeugung entsprechender Kompensationssignale 4 zugrunde gelegt. Die Ausgabe der Kompensationssignale 4 kann das oder die dem EOC-System 1 zugehörige(n) Ausgabeelement(e) 10 und/oder über das oder die Audioausgabeelement(e) 11 der Audioausgabeeinrichtung 12 erfolgen. In letzterem Fall können die Kompensationssignale 4 dem über das oder die Audioausgabeelement(e) 11 der Audioausgabeeinrichtung 12 auszugebenden bzw. ausgegebenen Audiosignal zugemischt werden.In an eighth step S8 of the method, the EOC system 1 is finally operated using the selected operating parameter. The selected operating parameter is then used as a basis for generating corresponding compensation signals 4 during operation of the EOC system 1 . The output of Compensation signals 4 can be output from the output element(s) 10 associated with the EOC system 1 and/or via the audio output element(s) 11 of the audio output device 12 . In the latter case, the compensation signals 4 can be added to the audio signal to be output or output via the audio output element(s) 11 of the audio output device 12 .

Fig. 3 zeigt eine Prinzipdarstellung eines zeitlichen Verlaufs spektraler Komponenten 23 gemäß einem Ausführungsbeispiel; die in Fig. 3 dargestellten spektralen Komponenten 23 sind sonach in der Zeitdomäne aufgetragen, wobei die x-Achse die Zeitachse darstellt. 3 shows a basic representation of a time course of spectral components 23 according to an embodiment; in the 3 The spectral components 23 shown are therefore plotted in the time domain, with the x-axis representing the time axis.

Anhand von Fig. 3 sollen beispielhaft mögliche Ausführungsbeispiele des Modifizierens der erfassten spektralen Komponenten erläutert werden.Based on 3 possible exemplary embodiments of modifying the detected spectral components are to be explained by way of example.

Wie in Fig. 3 rein beispielhaft gezeigt, können die spektralen Komponenten 23 einen rechteckähnlichen (zeitlichen) Verlauf mit einem zu einem bestimmten Zeitpunkt t1 von einem Referenzwert R erfolgenden, insbesondere plötzlichen, Anstieg auf einen Plateauwert P, einen gewissen zeitlichen, im Wesentlichen konstanten Verlauf auf dem Plateauwert P und einen zu einem bestimmten Zeitpunkt t2 von dem Plateauwert P erfolgenden, insbesondere plötzlichen, Abstieg 27 auf den Referenzwert R aufweisen.As in 3 shown purely by way of example, the spectral components 23 can have a square-wave (time) profile with a particular time t 1 occurring from a reference value R, in particular a sudden increase to a plateau value P, a certain time-related, essentially constant profile on the plateau value P and a, in particular sudden, drop 27 from the plateau value P to the reference value R at a specific point in time t 2 .

Das Modifizieren der spektralen Komponenten 23 zur Erzeugung von modifizierten spektralen Komponenten 23' kann - wie in Fig. 3 gezeigt - durch Erzeugung einer zusätzlichen Eingangsverstärkung 25, d. h. eines zusätzlichen Gains, im Bereich eines ersten (lokalen) Anstiegs 24 der jeweiligen spektralen Komponenten 23 in der Zeitdomäne erfolgen. Die spektralen Komponenten 23 können sonach durch eine gezielt erzeugte Verstärkung im Bereich eines ersten Anstiegs 24 der spektralen Komponenten 23 in der Zeitdomäne erfolgen. Die gezielt erzeugte Verstärkung erfolgt in dem Ausführungsbeispiel gemäß Fig. 3 zu dem Zeitpunkt t1.The modification of the spectral components 23 to generate modified spectral components 23 'can - as in 3 shown - by generating an additional input gain 25, ie an additional gain, in the area of a first (local) rise 24 of the respective spectral components 23 in the time domain. The spectral components 23 can therefore take place through a specifically generated amplification in the area of a first rise 24 of the spectral components 23 in the time domain. The purposefully generated amplification takes place in the exemplary embodiment according to FIG 3 at time t 1 .

Das Modifizieren der spektralen Komponenten 23 zur Erzeugung von modifizierten spektralen Komponenten kann - wie ebenso in Fig. 3 gezeigt - alternativ oder ergänzend auch durch zeitliche Verlängerung 26 (Dehnung) der spektralen Komponenten 23 im Bereich eines (lokalen) Abstiegs 27, insbesondere eines auf den (lokalen) Anstieg 24 folgenden (lokalen) Abstiegs 27, der spektralen Komponenten 23 in der Zeitdomäne erfolgen. Die spektralen Komponenten 23 können sonach durch eine gezielt erzeugte Verlängerung 26 im Bereich eines entsprechenden Abstiegs 27 der spektralen Komponenten 23 in der Zeitdomäne erfolgen. Die gezielt erzeugte Verlängerung 26 erfolgt in dem Ausführungsbeispiel gemäß Fig. 3 zu dem Zeitpunkt t2.The modification of the spectral components 23 to generate modified spectral components can - as well as in 3 shown - alternatively or additionally by temporal extension 26 (expansion) of the spectral components 23 in the region of a (local) descent 27, in particular one of the (local) rise 24 following (Local) descent 27, the spectral components 23 take place in the time domain. The spectral components 23 can therefore occur through a specifically generated extension 26 in the area of a corresponding descent 27 of the spectral components 23 in the time domain. The specifically generated extension 26 takes place in the exemplary embodiment according to FIG 3 at time t 2 .

Die zeitliche Verlängerung 26 des Abstiegs 27 der spektralen Komponenten 23 kann einem durch die Dauer einer Impulsantwort, d. h. insbesondere einer Raumimpulsantwort, eines dem EOC-System 1 bzw. dem diesen zugehörigen akustischen Sensoreinrichtung 6 zugehörigen akustischen Sensorelements 7 nach einem in die Fahrgastzelle 8 emittierten Audiosignal bestimmten Zeitintervall entsprechen. Insbesondere kann die zeitliche Verlängerung 26 des Abstiegs 27 ihrem zeitlichen Verlauf nach einer Hüllkurve um einen Signalverlauf der bzw. einer Impulsantwort, d. h. insbesondere einer Raumimpulsantwort, der dem EOC-System 1 zugehörigen akustischen Sensoreinrichtung 6 bzw. dem dieser zugehörigen akustischen Sensorelement 7 nach einem in die Fahrgastzelle 8 emittierten Audiosignal bestimmten Zeitintervall entsprechen.The time extension 26 of the descent 27 of the spectral components 23 can be influenced by the duration of an impulse response, i. H. correspond in particular to a room impulse response of an acoustic sensor element 7 associated with the EOC system 1 or the acoustic sensor device 6 associated therewith after a certain time interval emitted into the passenger compartment 8 audio signal. In particular, the time extension 26 of the descent 27 can be extended over time according to an envelope by a signal curve of the or an impulse response, i. H. in particular a room impulse response corresponding to the acoustic sensor device 6 associated with the EOC system 1 or to the acoustic sensor element 7 associated with it after a specific time interval emitted into the passenger compartment 8 audio signal.

Claims (9)

  1. Method for operating an engine order cancellation system (1) (EOC system), which, on the basis of system-side operating parameters, serves to generate compensation signals (4) used to compensate for acoustic interference signals (3) resulting from the operation of a motor vehicle-side drive unit (2), comprising the following steps:
    - detecting of all output audio signals (13) to be output via at least one audio output device (12) comprising at least one audio output element (11) into an interior of a motor vehicle (5), in particular a passenger compartment (8) of a motor vehicle (5),
    - generating a sum signal (15) describing all recorded audio signals (13),
    - extracting the spectral components (23) of the sum signal (15), which may have been prefiltered, the frequencies of which correspond to the frequencies of the acoustic interference signals (3) to be compensated or compensated for by the EOC system (1), wherein the frequencies of the acoustic interference signals to be compensated or compensated by the EOC system (1) are known;
    - modifying the respective extracted spectral components (23) to generate modified spectral components (23'), characterized by
    - converting the modified spectral components (23') into an operating parameter of the EOC system (1), wherein the operating parameter is the forgetting factor or the step size,
    - comparing the operating parameter of the EOC system (1) with a comparative operating parameter,
    - selecting the operating parameter having the most influence on the performance of the EOC system (1) and/or the stability of the EOC system (1) on the basis of the comparison,
    - operation of the EOC system (1) using the selected operating parameter wherein
    the modification of the detected spectral components (23) for the generation of modified spectral components (23') is effected by generating an additional input amplification in the region of a first increase (24) of the respective spectral component (23) in the time domain, and/or the modification of the respective detected spectral components (23) for the generation of modified spectral components (23') is effected by time extension (26) of the respective spectral component (23) in the region of a descent (27 ) of the respective spectral component in the time domain.
  2. Method according to claim 1, wherein the operating parameter having the lowest value is selected.
  3. Method according to claim 1 or 2, wherein before the spectral components of the sum signal (15) are detected, pre-filtering is carried out, wherein frequency ranges of the sum signal (15) are filtered which do not correspond to the frequency range in which the EOC system (1) generates compensation signals.
  4. Method according to one of the preceding claims, wherein the modification of the respective detected spectral components (23) for the generation of modified spectral components (23') is effected by time extension (26) of the respective spectral component (23) in the region of a descent (27 ) of the respective spectral component in the time domain, wherein the time extension (26) of the descent (27) of the respective spectral component (23) corresponds to a time interval determined by the duration of a pulse response of an acoustic sensor element (7) belonging to the EOC system (1) after an audio signal emitted into the interior.
  5. Method according to claim 4, wherein the time extension (26) of the descent (27) in terms of its course in time corresponds to an envelope around a signal course of a pulse reply of a sensor element (7) belonging to the EOC system (1) after an audio signal emitted into the interior.
  6. Method according to one of the preceding claims, wherein all audio signals to be output via the audio output device (12) are detected and combined before the audio signals are actually output into the interior.
  7. Method according to one of the preceding claims, wherein the summation signal (15) is generated by summing up all the recorded audio signals.
  8. Engine order cancellation system (1), comprising an audio output device (12) which comprises at least one audio output element, wherein the engine order cancellation system is configured to generate compensation signals (4) used to compensate for acoustic interference signals (3) resulting from the operation of a motor vehicle-side drive unit (2), characterized in that it is used to carry out the method according to one of the preceding claims.
  9. Motor vehicle (5), comprising an engine order cancellation system (1) according to claim 8.
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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170433A (en) * 1986-10-07 1992-12-08 Adaptive Control Limited Active vibration control
US5418857A (en) * 1993-09-28 1995-05-23 Noise Cancellation Technologies, Inc. Active control system for noise shaping
US20040086135A1 (en) * 2002-11-01 2004-05-06 Siemens Vdo Automotive Inc. Active noise control system using pure feedforward method with order-based offline calibration
GB2551464A (en) * 2016-03-17 2017-12-27 Jaguar Land Rover Ltd Apparatus and method for noise cancellation

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WO2019242837A1 (en) 2019-12-26

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