WO2019233790A1

WO2019233790A1 - Evaluating device, sound transducer, vehicle, method and computer program product for damping disturbing components in noises outside of the vehicle

Info

Publication number: WO2019233790A1
Application number: PCT/EP2019/063464
Authority: WO
Inventors: Bernd Kernebeck
Original assignee: Zf Friedrichshafen Ag
Priority date: 2018-06-07
Filing date: 2019-05-24
Publication date: 2019-12-12
Also published as: DE102018209043A1; EP3804354A1

Abstract

The invention relates to a sound transducer (1000) for a vehicle for damping disturbing components (11) in noises (10) outside of the vehicle, comprising an oscillating element (100) for performing oscillations, a sensor (200) for converting oscillations of the oscillating element (100) produced by sound waves of the noises (10) into a first signal (12), an actuator (300) for at least damping deflections of the oscillating element (100) resulting from the oscillations, and an evaluating device (700) designed to determine a useful component (13) and the disturbing component (11) of the first signal (12) in dependence on the first signal (12), to determine a second signal (14) in dependence on the disturbing component (11) and to provide the second signal (14) to the actuator (300) in order to at least damp the deflections of the oscillating element (100) resulting from the disturbing component (11) in dependence on the second signal (14).

Description

Evaluation. Sound transducers. Vehicle, method and computer program product for damping noise components in noise outside the vehicle

The invention relates to an evaluation device according to claim 1 for a vehicle for damping noise components in noise outside the vehicle. Furthermore, the invention relates to a sound transducer according to claim 2 for a vehicle for damping noise components in noise outside the vehicle. In addition, the invention relates to a vehicle according to claim 10 with at least one transducer according to the invention. Furthermore, the invention relates to a method according to claim 12 for damping noise components in noise outside of a vehicle. The invention also relates to a computer program product according to claim 14 for a vehicle for damping noise components in noise outside the vehicle. Furthermore, the invention relates to a use according to claim 15 of an evaluation device according to the invention, a transducer according to the invention and / or a computer program product according to the invention for damping noise components in noise in areas outside the automotive sector.

Antisound transmitters are known from the prior art. Anti-sounders are used to actively cancel unwanted sound fields by means of controlled interference. Anti-sirens usually comprise a control system consisting of a sound sensor and a sound source, such as speakers. The loudspeaker is controlled by the sensor in such a way that constant pressure is maintained in the areas of the sound fields. DE 28 14 093 C2, for example, discloses an anti-noise transmitter.

WO 2010 040 705 A1 discloses a device for reducing extraneous sound by generating counter sound. By active noise compensation is an extinction of noise and counter sound, especially in the ear canal of a wearer of the device. In active noise cancellation, for example anti-sounding devices, a membrane is actively vibrated to extinguish sound fields via interference. That is, the membrane is actively deflected to vibrate.

The sensors used to record sound are, for example, microphones. In the automotive sector, noise is much louder than the actual useful noise. For example, environmental noise such as driving noise and / or noise from wind and engine is received during a car ride as noise. These noises are louder than, for example, a sound of a follow-on horn of an approaching emergency vehicle. The sound of the subsequent sound horn, for example, a siren of an ambulance or fire engine, corresponds to the Nutzgeräusch. In order to compensate for noise in the automotive sector by the known from the prior art active noise compensation, it is therefore necessary to strongly deflect the microphone diaphragm. However, the problem then arises that the microphone diaphragm quickly reaches its deflection limit, also referred to as clipping. As a result, audio files are unusable.

This is where the invention starts. The invention has the object to improve at least the attenuation of noise components in the detection of noise in the automotive sector and other areas.

According to one aspect of the invention, the object is achieved by an evaluation device for a vehicle for damping noise components in noise outside the vehicle with the features of claim 1. Accordingly, the evaluation device comprises a first interface in order to obtain a first signal of a sensor of a sound transducer. Furthermore, the evaluation device comprises a second interface in order to provide a second signal to an actuator of the sound transducer. The evaluation device is designed to determine a useful component and the interference component of the first signal as a function of the first signal. Depending on the second component, the evaluation device determines a second signal. Depending on the second signal, the deflections of the sound transducer caused by the noise component are at least damped by means of the actuator. With the invention Evaluation is analyzed, the first signal and the transducer so controlled that its deflections, which are caused by noise components, are at least damped. Thus, the useful portion of the first signal is further processed undisturbed, without the noise component must be deleted by active deflection of the transducer. Advantageously, the evaluation device is designed to completely compensate for the deflections of the sound transducer caused by the interference component by means of the actuator. Particularly preferably, the evaluation is executed, with very bad noise ratio useful ratio, in English Signal Noise Ratio, abbreviated SNR, that is, with predominant interference component to filter out any user parts.

According to one aspect of the invention, the object is achieved by a sound transducer for a vehicle for damping noise components in noise outside the vehicle with the features of claim 2. Accordingly, the sound transducer comprises a vibrating member to perform vibrations. Furthermore, the sound transducer comprises a sensor for converting vibrations of the vibration member generated by sound waves of the noise into a first signal. In addition, the sound transducer comprises an actuator in order to damp at least by the vibrations induced deflections of the vibrating member. Furthermore, the sound transducer comprises an evaluation device. The evaluation device is designed to determine a useful component and the interference component of the first signal as a function of the first signal. Furthermore, the evaluation device is designed to determine a second signal as a function of the interference component. The second signal provides the evaluation device to the actuator. Depending on the second signal, the deflections of the oscillating member caused by the interference component are at least attenuated by means of the actuator.

As a result, the oscillating member is brought almost to rest and must not be actively deflected for noise compensation. If the noise picked up by the sensor is a pure noise, for example a motor noise, then the evaluation device determines the second signal as an inverse interference component. The actuator to which this inverse interference component is provided causes the oscillating member to rest. With an additional useful portion, for example a siren of an emergency vehicle, the actuator will deflect the oscillating member in such a way that the sensor only further processes the deflections caused by the useful portion. In order to Clipping can be prevented. Preferably, the sound transducer comprises an evaluation device according to the invention. The acoustic transducer preferably comprises a first coil which receives sound and corresponds to the sensor, and a second coil which corresponds to the actuator.

According to a further aspect of the invention, the object is achieved by a vehicle having at least one sound transducer according to the invention with the features of claim 10. Accordingly, the at least one sound transducer is arranged outside the vehicle interior, preferably on a bumper, on a side region of the vehicle or on the vehicle roof is. The evaluation of the transducer is designed to classify while driving with the vehicle noise, especially driving noise, driving wind, and / or engine noise, as interference components of the first signal and to determine the second signal such that the interference components by corresponding zero oscillations of the oscillating member of the at least one sound transducer are compensated. This can be used to detect sirens of emergency vehicles and other useful noises. Advantageously, the vehicle comprises an arrangement of a plurality of sound transducers according to the invention. A first sound transducer is arranged, for example, on the right edge of the front bumper. A second sound transducer is arranged on the left edge of the front bumper. A third transducer is located on the right edge of the rear bumper. A fourth transducer is located on the left edge of the rear bumper. Such an arrangement additionally provides information about a direction from which the sounds are received. Alternatively, the sensor of the sound transducer is a 360 ° -view sensor that detects omnidirectional noise. Such a sound transducer is advantageously arranged on the vehicle roof. The sound transducer is preferably a digital sound transducer. Alternatively, the sound transducer is an analog sound transducer.

According to a further aspect of the invention, the object is achieved by a method for damping noise components in noise outside a vehicle with the method steps according to claim 12. Accordingly, vibrations of a vibration member generated by sound waves are converted into a first signal. Depending on the first signal, a useful portion and a noise component of the first Signals determined. Depending on the noise component, a second signal is determined. The second signal is provided to the actuator. Depending on the second signal, at least the deflections caused by the interference component of the

Damped vibration element. This method advantageously allows a compensation of noise without permanent active deflection of the oscillating member. The compensation eliminates the unwanted effect of the interference component by immobilizing the oscillating member with respect to the interference components. In the case of compensation, the second signal is also called the compensation signal.

According to a further aspect of the invention, the object is achieved by a computer program product for a vehicle for damping extraneous noise in noises outside the vehicle with the features of claim 14. Accordingly, the computer program product is designed to be loaded into a memory of a computer of the vehicle. The computer program product comprises software code sections with which the method according to the invention can be executed when the computer program product is running on the computer. The computer program product according to the invention is platform independent. That is, it can run on any computing platform. Preferably, the computer program product is executed on an evaluation device according to the invention or on a sound transducer according to the invention. The software code sections are written in any programming language.

According to a further aspect of the invention, the object is achieved by using an evaluation device according to the invention, a sound transducer according to the invention and / or a computer program product according to the invention for damping noise components in noise in areas outside the automotive sector according to claim 15.

Further developments and advantageous embodiments are specified in the dependent claims and the figures.

An evaluation device is a device that processes incoming information and outputs a result resulting from this processing. Insbesonde- re is an electronic circuit, such as a central processing unit or a graphics processor, an evaluation device. An arrangement of several processors is also an evaluation device. A computer is also an evaluation device.

The evaluation device is preferably realized as a system-on-a-chip, that is, all or at least a large part of the functions are integrated on one chip. The chip includes, for example, a multi-core processor with central processing processors, referred to in English as the Central Processing Unit, abbreviated CPU. The chip also includes graphics processors, referred to in English as the Graphic Processing Unit, abbreviated GPU. Graphics processors are particularly advantageous for parallel processing, called parallel computing, of operations.

The chip is preferably integrated in a vehicle control device, in the English Electronic Control Unit, abbreviated ECU. The vehicle control device is designed to regulate longitudinal and / or lateral control of the vehicle by means of vehicle actuators. By detecting noises, the vehicle is thus controlled as a function of useful noise, preferably automated.

The invention also provides a human-machine interface, in the English Human Machine Interface, abbreviated HMI, to inform a driver about the detected useful portions of a noise.

The evaluation device is advantageously a parallel computer. A parallel computer performs processing operations simultaneously on, among others, multiple main and / or graphics processors. Graphics processors are particularly suitable for parallel computing. With such a structure, the evaluation device is scalable, that is, the evaluation device can be adapted in particular for different automation levels of automated driving (standard SAEJ3016). Higher levels of automation require more computing power than lower levels of automation. Highly automated driving corresponds to autonomous vehicles. Preferably, the evaluation device is designed to execute a control loop. A control circuit is realized, for example, with an electronic circuit comprising diodes, capacitors and / or microcontrollers. Actual value is the first signal from the sensor, which is continuously recorded. Target value is the useful portion of the first signal. The sensor and the actuator form the controlled system. Control difference is the noise component. The actuator is charged with the inverse interference component. Through the control loop, the sensor is controlled to pass only the payloads.

A vehicle is a land vehicle or a watercraft. Examples are road vehicles, in particular passenger cars, lorries and trucks. A minibus and a bus are also vehicles.

Noises outside the vehicle are noises that arise outside of the vehicle. Sound waves of these noises reach the vehicle. The noise and the sensor signals resulting from the noise include interference components and useful components. User shares are the shares that carry certain information and are to be used. User shares are created by the noise source of the useful noise. Noise components are the components that have no use for the further processing of the actual useful noise. Disturbance components are caused by additional noise sources and are superimposed on the user noise. In a car trip are noise components, for example, driving wind and / or engine noise.

An interface is a component between at least two functional units, at which an exchange of logical quantities, for example data, or physical quantities, for example electrical signals, takes place, either only unidirectionally or bidirectionally. The exchange can be analog or digital. The exchange can also be wired or wireless.

A sensor is a technical component that detects certain physical properties of its environment, for example sound pressure, qualitatively and / or quantitatively as a measured variable and in a further processing, preferably electrical, Signal, for example, an electrical voltage, transforms. The signal provided by the first sensor is preferably an audio signal.

The counterpart to a sensor is an actuator. Actuators convert signals into mechanical motion or other physical quantities, such as vibrations, and actively intervene in a process.

A transducer is a device that converts sound pressure into electrical signals and converts electrical signals into sound pressure. This allows a transducer to perform the functions of a sensor and an actuator. A microphone is a sound transducer in the form of a sensor. A loudspeaker is a sound transducer in the form of an actuator.

A vibrating member is a component for generating, amplifying, absorbing, damping or measuring vibrations. A vibration membrane is a vibrating member. The vibrating member is, for example, a thin skin or foil that generates or modifies vibrations. Depending on the design of the sound transducer, the vibration element follows the sound pressure or the sound pressure gradient. Pressure gradient microphones also detect the direction from which sound waves arrive.

A program belongs to the software of a data processing system, for example an evaluation device or a computer. Software is a collective term for programs and related data. The complement to software is hardware. Hardware refers to the mechanical and electronic alignment of a data processing system. The evaluation device itself is a hardware.

Computer program products typically include a sequence of instructions that cause the hardware, when the program is loaded, to perform a particular procedure that results in a particular result. When the program in question is used on a computer, the computer program product causes a technical effect, namely at least attenuation of the deflections of the oscillating member due to the interference component as a function of the second signal. Preferably, the sensor converts the oscillations into the first signal according to a transducer principle of a dynamic microphone, a condenser microphone, a piezo microphone or a carbon microphone.

In the dynamic microphone, the speed of the movement of the

Oscillating member to the first signal, not the instantaneous deflection of the vibrating member. A voice coil microphone is a dynamic microphone. When incoming sound waves, the vibrating member is set in motion. A coil immersed in a magnetic field is thereby moved in the magnetic field. This induces a voltage.

In the condenser microphone, an electrically conductive membrane is mounted as a vibrating member in front of a metal plate electrically insulated. The oscillating member thus corresponds to a second plate of a plate capacitor. By movement of the

Oscillating element due to sound waves, the capacitance changes.

Piezo microphones use the piezo effect to generate the first signal. The oscillating member is coupled to a piezoelectric component, for example a ceramic.

In the case of the carbon microphone, a pressure-dependent contact resistance in a carbon granulate stored behind the oscillating member leads to the first signal.

Preferably, the actuator converts the second signal into the oscillations according to a transducer principle of a voice coil loudspeaker, a magnetostatic loudspeaker, a piezo loudspeaker, an electromagnetic loudspeaker or a plasma loudspeaker, wherein the actuator is preferably a plunger coil. The speakers work according to the effects described for the microphones.

Plasma speakers convert electrical signals directly into sound waves without the need for mechanical oscillators. This produces an air plasma whose field is dependent on the quality of the signal oscillates. Plasma speakers use the property of gases to expand when heated and contract again on cooling.

Preferably, the transducer comprises an analog-to-digital converter to convert the first signal to a digital equivalent. Furthermore, the sound transducer comprises a classifier which, depending on known useful components, classifies the useful component and the interference component of the first signal and determines the second signal as a function of the classified interference component. In addition, the transducer includes a digital-to-analog converter to convert the second signal to an analog equivalent. Preferably, the analog-to-digital converter, the classifier and the digital-to-analog converter are integrated in the evaluation device. Thus, a digital sound transducer is advantageously provided and the determination of the interference and useful components is digital, so in particular on a computer executable.

An analog-to-digital converter is an electronic circuit or device that converts a continuous waveform into binary numbers. The binary numbers indicate how often a specific signal interval is contained within the signal. A digital-to-analog converter is the counterpart to an analog-to-digital converter.

A classifier is a mechanical component, an electronic circuit or an algorithm which classifies a set of objects, for example noise components in a sound or signal components in a signal, into classes, for example noise and useful components. Classifiers recognize patterns and can be implemented in a computer program. The known user components are stored, for example, in a database of the classifier or an external memory to which the classifier has access, for example by means of a wireless interface.

According to a preferred embodiment of the invention, the classifier is a computer program product. The computer program product comprises software code sections for determining the second signal as a function of the classified interference component. The evaluation device is designed to execute the computer program. Preferably, the classifier is an artificial neural network that is trained to determine useful and / or noise components in the first signal. This will be Advantageously, a software algorithm provided to filter out noises from Nutzanteile. The artificial neural network no longer has to rely on deposited user shares. Through training, the artificial neural network has learned what useful parts and what are noise components, for example, depending on frequency and / or amplitude characteristics of the first signal. The artificial neural network has the advantage that it can purposely respond to new information, for example, sounds that it has not yet processed in the training phase.

Artificial intelligence is a generic term for the automation of intelligent behavior. For example, an intelligent algorithm learns to react purposefully to new information. An artificial neural network, known in English as the Artificial Neural Network, is an intelligent algorithm. An intelligent algorithm is designed to learn to react purposefully to new information. The training phase is inspired by the learning process of a brain.

Preferably, the evaluation device is designed to determine the second signal as a function of frequencies of the sound waves such that below or above a certain frequency results in a zero oscillation of the oscillation element. At zero vibration, the vibrating member is at rest. For example, it can be achieved that the oscillating member does not oscillate at frequencies below 100 Hz. For example, useful parts in road traffic are above 100 Hz. Shares below 100 Hz are then noise components. This realizes a first noise filter.

In an embodiment of the invention, the evaluation device is designed to determine the second signal such that the oscillating member only at low frequencies, high frequencies or within an adjustable frequency range

Performs vibrations. This advantageously implements a low-pass, high-pass or band-pass filter. The evaluation device thus realizes filter functions. Certain interference signals, for example truck hum at, for example, 250 Hz, can thus be specifically eliminated. If, for example, traffic noise is disturbed by a nearby truck engine noise in traffic, the filter function of the evaluation are used to filter away this noise. Useful signals, for example sirens of emergency vehicles, are still detected, for example also with a bandpass filter, which only lets pass the frequencies typical for sirens. With a bandpass filter advantageously only a certain frequency range is detected selectively. With the bandpass filter preferably Nutzfrequenzspektren are permanently scanned, preferably narrowband dig. If a useful signal is detected, the evaluation device can specifically detect this useful signal by means of the filter functions. In combination with the execution of the computer program product, the receiving area or the sensitivity range of the sound transducer is advantageously adaptable by software and changeable or displaceable during recording.

Advantageously, the evaluation device is designed to recognize a substantially constantly acting on the vibrating member suppressing or overpressure and to determine the second signal in response to the negative pressure or the overpressure such that the actuator moves the vibrating member in a rest position. When driving with the vehicle, a speed-dependent driving wind is created, to which, if necessary, an existing wind is added. The driving wind presses against the oscillating member and moves it out of the rest position. According to the invention, the oscillating member is pressed back into the rest position in such situations in order not to modify the sound recording.

Advantageously, the at least one sound transducer comprises interfaces to vehicle sensors, preferably an air pressure sensor. This will be one on the

Detected oscillating member suppressing or overpressure detected and the second signal in response to the negative pressure or the overpressure determined such that the actuator moves the vibrating member in a rest position. Alternatively or additionally, the sound transducer interfaces with speed sensors to determine a speed-dependent manipulated variable for the actuator so that it can move the vibrating member back to the rest position.

Preferably, an inventive transducer is used to carry out the method. The invention will be explained by way of example in the following figures. Show it:

1 a is a sectional view of an embodiment of a transducer according to the invention,

1 b is a plan view of the transducer according to Fig. 1a,

1 c shows a side view of the sound transducer according to FIG. 1 a,

2 shows an embodiment of a known from the prior art sound transducer,

3 shows an embodiment of a sound transducer according to the invention when applying a noise component,

4 shows an exemplary embodiment of a sound transducer according to the invention when applying a noise component and a useful component,

Fig. 5 is a schematic representation of the filter functions of the invention and

Fig. 6 is a schematic representation of the method according to the invention.

In the figures, like reference numerals designate like or functionally similar reference parts. For the sake of clarity, only the respectively relevant reference parts are marked in the individual figures.

1 a shows, for example, a sectional view of a sound transducer 1000 according to the invention. FIG. 1 b shows the sound transducer in plan view. The sound transducer 1000 is arranged, for example, on a vehicle roof of a passenger car. The sound transducer 1000 includes a swing member 100. The swing member 100 is a diaphragm. On the vibrating member 100 sound waves of noise 10 meet. The sources of noise 10 are outside of a vehicle. The Sound waves deflect the vibrating member 100. The vibrating member 100 starts to vibrate. The oscillations are dependent, for example, on the frequency and amplitude of the sound waves, on a self-resonant frequency of the vibrating member 100, on a damping constant of the vibrating member 100 and / or on a clamping of the vibrating member 100 in the sound transducer 1000.

These vibrations are detected by a sensor 200. The sensor 200 is, for example, a plunger coil 203 immersed in a field of a permanent magnet 201, see FIG. 1 c. A bobbin 202 of the plunger coil 203 is connected to the swing member 100. Due to the vibrations of the oscillating member 100, the plunger coil 203 oscillates in the permanent magnetic field. As a result, an electrical voltage is induced. The electrical voltage is evaluated as a first signal 12.

The first signal 12 is provided via a first interface 701 of an evaluation device 700. The evaluation device 700 is a control loop. Input variable of the control loop is the first signal 12 as an actual value. The control loop regulates the controlled system comprising the sensor 200 and an actuator 300. In the event that the sensor 200 includes the plunger coil 203, the actuator 300 is preferably not a plunger coil 203 but, for example, a piezoelectric actuator. The first signal 12 contains at the beginning of the control a noise component 11 and a useful portion 13. The useful portion 13 corresponds to the desired value. The target value is stored in a database. Preferably, the target value is determined by means of artificial intelligence, for example with an artificial neural network, which has been trained to filter out noises 10 payloads 13. At the end of the control, the oscillating member 100 only executes vibrations corresponding to the useful portion 13. The noise component 1 1 was corrected. The control difference between the first signal 12 and useful portion 13 corresponds to the interference component 1 1. The inverse interference component 1 1 results in a second signal 14. The second signal 14 is a manipulated variable for the actuator 300. The second signal 14 is the actuator 300 via a second interface 702 provided. The actuator 300 prevents the oscillations of the oscillating member 100 caused by the interference components 11. The evaluation device 700 is preferably a digital evaluation device and comprises an analog-to-digital converter 400. The analog-to-digital converter 400 digitizes the electrical voltage which the sensor 200 delivers as its output variable into a digital data stream. This data stream is further processed by the evaluation device 700 with a classifier 500. The classifier 500 is, for example, an algorithm which determines the useful signal 13 and the interference component 11 of the first signal 12 by processing the first signal 12. Preferably, the classifier 500 is an artificial neural network. The evaluation device 700 is designed to execute the artificial neural network. For example, the evaluation device 700 has sufficient computing power and sufficient storage capacity. The evaluation device 700 also includes a digital-to-analog converter 600. The digital-to-analog converter 600 converts the result of the classifier 500 back into an electrical voltage. The evaluation device 700 preferably comprises a device for voltage adjustment in order to optimally adapt this voltage to the actuator 300. The voltage adjustment device is, for example, an amplifier. Alternatively, the invention provides an impedance matching.

FIG. 2 shows a sound transducer 1000 known from the prior art. The noise 10 impinging on the vibration member 100 is a noise and consists of noise components 11. Without the evaluation device 700 according to the invention, the sensor 200 outputs the interference signal 1 1 as an output signal 15. The output signal 15 is the output signal 15 of the sound transducer 1000.

FIG. 3 shows the sound transducer 1000 according to the invention. The vibration element 100 is excited by interference components 11. The evaluation device 700 controls the interference component 1 1 by the second signal 14. The second signal 14 is a compensation signal with respect to the first signal 1 1. 1m controlled state, the vibrating member remains in rest position. The conditional by the interference component 1 1 vibrations are prevented. The output signal 15 of the sensor 200 is a zero signal.

In FIG. 4, the noise 10 comprises the interference component 11 and the useful component. The evaluation device 700 determines the second signal 14 in such a way that in the adjusted stood the vibrating member 100 is only excited by the useful portion 13 of the noise 10. The output signal 15 of the sensor 200 is thus the useful portion 13.

FIG. 5 shows the filter functions of the evaluation device 700. Plotted is a power level of the sound transducer 1000 in decibels as a function of a frequency f. Without the evaluation device 700 according to the invention, the power level above a certain frequency f is independent of the frequency f. The evaluation device 700 makes it possible to determine the second signal 14 in such a way that the vibration element 100 executes vibrations only at low frequencies f. This corresponds to a low-pass filter TP. The evaluation device 700 further makes it possible to determine the second signal 14 in such a way that the vibration element 100 executes vibrations only at high frequencies f. This corresponds to a high-pass filter HP. The evaluation device 700 also makes it possible to determine the second signal 14 in such a way that the vibration element 100 executes vibrations only in a defined frequency band. This corresponds to a bandpass filter BP. The individual filters can be combined with each other. With the bandpass filter BP, the surroundings of the vehicle can be specifically scanned for noises 10 whose frequency f lies in the bandpass filter's frequency band.

The method according to the invention is shown in FIG. In a first method step V1, vibrations of the oscillating member 100 generated by sound waves are converted into the first signal 12. In a second method step V2, a useful component 13 and a noise component 11 of the first signal 12 are determined as a function of the first signal 12. In a third method step V3, the second signal 14 is determined as a function of the interference component 11. In a fourth method step V4, the second signal 14 is provided for the actuator 300. In a fifth method step, the deflections of the oscillating member caused by the interference component 11 are at least attenuated as a function of the second signal 14.

The method is programmed in a programming language with corresponding program instructions and is executed as software on the evaluation device 700 according to the invention. Thus, the recording area or the sensitivity rich of the transducer 1000 via software adaptable and changeable during a sound recording.

The invention is particularly advantageous for a vehicle for damping noise components 11 in noises 10 outside the vehicle, for example, driving wind noise. Of course, the invention can also be used for other areas, for example, for press and / or Fernsehhlivübertragungen to compensate for noise 11 at the transmission site, for example wind noise. According to the invention is thus also a use of an evaluation device 700 according to the invention, a transducer 1000 according to the invention and / or a computer program product according to the invention for damping noise components 11 in noises 10 in areas outside the automotive sector, preferably press and / or Fernsehhliveübertragungen.

Bezuaszeichen

I vehicle

1000 transducers

100 swinging member

200 sensor

201 permanent magnet

202 coil carrier

203 plunger coil

300 actuator

400 analog-to-digital converters

500 classifier

600 digital-to-analog converter

700 evaluation device

701 first interface

702 second interface

10 noise

I I disturbance part

12 first signal

13 useful portion

14 second signal

15 output signal

f frequency

TP low-pass filter

HP high pass filter

BP bandpass filter

V1 -V5 process steps

Claims

claims

1. evaluation device (700) for a vehicle for damping noise components (11) in noise (10) outside of the vehicle comprising

A first interface (701) for obtaining a first signal (12) of a sensor (200) of a sound transducer (100), and

A second interface (702) for providing a second signal (14) to an actuator (300) of the sound transducer (1000),

wherein the evaluation device (700) is executed,

o to determine a useful component (13) and the interference component (11) of the first signal (12) as a function of the first signal (12) and to determine a second signal (14) as a function of the interference component (11),

in order at least to attenuate, as a function of the second signal (14), the deflections of the sound transducer caused by the interference component (11) by means of the actuator (300).

2. sound transducer (1000) for a vehicle for damping noise components (11) in noise (10) outside of the vehicle comprising

A vibrating member (100) for carrying out vibrations,

A sensor (200) generated by sound waves of the sounds (10)

To convert vibrations of the vibrating member (100) into a first signal (12),

An actuator (300) to at least attenuate deflections of the oscillating member (100) caused by the oscillations, and

An evaluation device (700), executed,

o to determine a useful component (13) and the interference component (11) of the first signal (12) as a function of the first signal (12),

o depending on the interference component (11) to determine a second signal (14) and

o provide the second signal (14) to the actuator (300),

in order to at least attenuate the deflections of the oscillating member (100) caused by the interference component (11) as a function of the second signal (14).

3. A sound transducer (1000) according to claim 2, wherein the sensor (200) after a

Transducer principle of a dynamic microphone, a condenser microphone, a piezo microphone or a carbon microphone which converts vibrations into the first signal (12).

4. A sound transducer (1000) according to claim 2 or 3, wherein the actuator (300) converts the second signal (14) into the vibrations according to a transducer principle of a voice coil loudspeaker, a magnetostatic speaker, a piezo loudspeaker, an electromagnetic loudspeaker or a plasma loudspeaker, preferably the actuator (300) is a plunger coil (203).

5. sound transducer (1000) according to one of claims 2 to 3, comprising

An analog-to-digital converter (400) to convert the first signal (12) to a digital equivalent,

• a classifier (500) which, depending on known useful components, classifies the useful component (13) and the interference component (11) of the first signal (12) and determines the second signal (12) as a function of the classified interference component (11), and

A digital-to-analog converter (600) to convert the second signal (14) to an analog equivalent,

wherein preferably the analog-to-digital converter (400), the classifier (500) and the digital-to-analog converter (600) are integrated in the evaluation device (700).

6. Sound transducer (1000) according to claim 5, wherein the classifier (500) is a computer program product comprising software code sections for determining the second signal (14) as a function of the classified interference component (11), and wherein the evaluation device (700) is embodied, executing the computer program, wherein preferably the classifier (500) is an artificial neural network that is trained to determine payloads (13) and / or jamming portions (11) in the first signal (12).

7. Sound transducer (1000) according to one of claims 2 to 6, wherein the evaluation device (700) is executed, the second signal (14) in response to frequencies (F) to determine the sound waves such that below or above a certain frequency (f) results in a zero vibration of the vibrating member.

8. Sound transducer (1000) according to one of claims 2 to 7, wherein the evaluation device (700) is designed to determine the second signal (14) such that the oscillating member (100) vibrations only at low frequencies (TP), high frequencies (HP) or within an adjustable frequency range (BP).

9. Sound transducer (1000) according to one of claims 2 to 8, wherein the evaluation device (700) is designed to detect a substantially constant acting on the oscillating member (100) negative pressure or overpressure and the second signal (14) in dependence on the negative pressure or the overpressure to be determined such that the actuator (300) moves the oscillating member (100) in a rest position.

10. Vehicle with at least one sound transducer (1000) according to one of claims 2 to 9, wherein

The at least one sound transducer (1000) is arranged outside the vehicle interior, preferably on a bumper, on a side region of the vehicle or on the vehicle roof, and

• the evaluation device (700) of the sound transducer (1000) is designed to classify noise generated during travel with the vehicle, in particular driving noise, driving wind, and / or engine noise, as interference components (1 1) of the first signal (12) and the second Signal (14) to be determined such that the interference components (1 1) by corresponding zero oscillations of the oscillating member (100) of the at least one sound transducer (1000) are compensated.

1 1. A vehicle according to claim 10, wherein the at least one sound transducer (1000) interfaces to vehicle sensors, preferably an air pressure sensor, to detect a force acting on the oscillating member (100) negative pressure or overpressure and the second signal (14) in dependence of Underpressure or the overpressure to be determined such that the actuator (300) moves the swing member (100) in a rest position.

12. A method for damping noise components (11) in noise (10) outside a vehicle comprising the method steps

Converting sound waves generated vibrations of a vibrating member (100) in a first signal (12) (V1),

Determining, as a function of the first signal (12), a useful component (13) and the interference component (11) of the first signal (12) (V2),

Depending on the interference component (11), determining a second signal (14) (V3),

Providing the second signal (14) for the actuator (300) (V4),

As a function of the second signal (14), at least attenuation of the deflections of the oscillating member (V5) caused by the interference component (11).

13. The method of claim 12, wherein for carrying out the method, a sound transducer (1000) is used according to one of claims 2 to 9.

14. A computer program product for a vehicle for damping noise components (11) in noises (10) outside the vehicle to be loaded into a memory of a computer of the vehicle, and the software includes software code sections, with which a method according to claim 12 is executable, if the computer program product is running on the computer.

15. Use of an evaluation device (700) according to claim 1, a sound transducer (1000) according to any one of claims 2 to 9 and / or a computer program product according to claim 14 for damping of interference components (11) in noise (10) in areas outside the automotive Area, preferably press and / or Fernsehhlivübertragungen.