Method for reproducing audio material in a vehicle, computer program product and vehicle

Abstract

Method for reproducing audio material in a vehicle, in particular in a passenger car, wherein the vehicle has an audio reproduction system and the method comprises the following steps: a. Providing audio material (X(t)); b. Providing a target transfer function (H SOLL (t)); wherein steps a) and b) are performed simultaneously by providing an audio file with payload data and metadata, wherein the payload data comprises the audio material and the metadata comprises the target transmission function. c. Providing multiple vehicle transmission functions ( HPKW 1 ( t ) ; HPKW 2 ( t ) ; HPKW 3 ( t ) ) of the vehicle, wherein the vehicle has several seat configurations (SK1; SK2; SK3; SK4) describing the occupancy of existing vehicle seats, wherein each seat configuration (SK1; SK2; SK3; SK4) is assigned to a specific vehicle transmission function ( HPKW 1 ( t ) ; HPKW 2 ( t ) ; HPKW 3 ( t ) ) is assigned; g. Determining a seating configuration (SK1; SK2; SK3; SK4) in the vehicle by detecting the presence of persons and / or objects; h. Selection of the specific vehicle transmission function ( HPKW 1 ( t ) ; HPKW 2 ( t ) ; HPKW 3 ( t ) ), which is assigned to the specific seat configuration (SK1; SK2; SK3; SK4); d. Modify the audio material by extracting it with the selected vehicle transfer function (HPKW 1 (t); HPKW 2 (t); HPKW 3 (t)); e. Modifying the audio material (X(t)) by imposing the desired transfer function (H SOLL (t)); f. Playing the modified audio material through the vehicle’s audio playback system.

Description

Technical area

[0001] The present invention relates to a method for reproducing audio material in a vehicle. Most currently sold vehicles come standard with an audio system that can be used to reproduce a wide variety of audio content. Furthermore, the invention relates to a computer program product associated with the system and a vehicle. Previously known state of the art

[0002] Vehicle hi-fi systems, also known as car radios, are well known for playing CDs, MP3 files, or radio broadcasts. Furthermore, such systems can sometimes be used to make phone calls and provide audible navigation instructions. Modern vehicles can include complete audio systems in which the audio system is permanently integrated. The following publications deal with customized audio playback: EP 2 755 404 A2, EP 1 571 884 A2, US 2014 / 0010 379 A1, DE 691 32 085 T2, and EP 1 679 233 A2.

[0003] In addition, vehicle audio systems are known where a variety of sound and content settings can be made. Disadvantages of the state of the art

[0004] The audio systems of vehicles known to date can make general sound adjustments, but these settings are not related to the audio material being played. Problem

[0005] The object of the present invention is therefore to provide a method for reproducing audio material in a vehicle, which enables the consumer to have an acoustic experience that is optimally adapted to the audio material. Inventive solution

[0006] The above object is achieved by a method for reproducing audio material in a vehicle, in particular in a passenger car, a computer program product, and a vehicle. The present invention is defined by claims 1, 4, 5, and 6. The dependent claims show preferred embodiments of the invention.

[0007] A method for reproducing audio material in a vehicle, particularly a passenger car, is proposed. The vehicle has an audio playback system. The method comprises the following steps: a. Providing audio material; b. Providing a target transfer function; c. Providing a vehicle transfer function of the vehicle; d. Modifying the audio material by removing a vehicle transmission function; e. Modifying the audio material by imposing the desired transfer function; f. Playing the modified audio material through the vehicle’s audio playback system.

[0008] The numbering of the steps of the method in lowercase Latin letters does not describe the order of the steps, but serves merely to simplify reference in the claims and the description. Rather, it is also possible that such steps occur quasi-simultaneously or are performed in a different order.

[0009] Audio material can, for example, be a piece of music, an audio book, a radio broadcast, or the audio portion of a video file. According to one embodiment, the audio material is provided via a removable data storage device, such as a CD or flash memory. Alternatively, the audio material can also be received wirelessly, for example, via a radio or broadcast signal or a Bluetooth or Wi-Fi connection. Any suitable data transmission methods can be used to provide audio material in step a).

[0010] For example, an audio material exhibits a sound that varies over time. The audio material can represent the sound as a temporal progression and can also be transformed into the frequency domain. The sound can thus also be represented as a function of different frequencies. The relationship between time and frequency representation is described mathematically by a Fourier transform.

[0011] In step b), a target transfer function is provided. The target transfer function can also be provided by any suitable method for transmitting data. The target transfer function can be provided in the same way as or in a different way than the audio material.

[0012] The transfer function describes the relationship between the input and output signals of a system. The transfer function is generally a complex-valued function of complex frequency or time and describes the change in the output signal caused by each individual frequency of an input signal. Using the transfer function, the output signal can be determined for any input signal if the transfer function is completely known.

[0013] Every system has a transfer function. According to one embodiment, the transfer function describes the relationship between an audio signal and the perceived sound of the played audio signal. The sound is influenced, on the one hand, by the electronic processing of the audio material and, on the other hand, by the sound propagation in the room (room acoustics) after the audio material is played back. The transfer function encompasses the relationship between the audio material and the perceived sound of the audio material by a consumer.

[0014] The audio playback system influences the sound of the audio material. The electronic components in the audio playback system amplify or attenuate different frequencies of the audio material to varying degrees. Manual adjustment of the sound is known as an equalizer (EQ). This can have frequency ranges (bands) in which the frequency gain can be manually adjusted.

[0015] Room acoustics influence the consumer's perception of sound through the room's characteristics, such as geometry and absorption capacity. Properties such as direct sound, reflections, and reverberation are widely known. Due to the location-dependent nature of room acoustics, a consumer's perception of sound generally varies from position to position within a room.

[0016] The transfer function of a system can be determined, for example, by the system's impulse response or step response. To do this, a Dirac pulse or a Heaviside pulse is applied to the system, and the system response is determined. Alternatively, the impulse response can be determined using white noise over a wide frequency range. In an acoustic determination, for example, the noise signal is fed into the room through a loudspeaker. The noise signal is simultaneously measured with a microphone. By cross-correlating the measured and emitted noise signals, the system's impulse response can be determined directly.

[0017] According to one embodiment, the transfer function is an impulse response.

[0018] Due to the transfer function of a system, the sound perception of identical audio material generally differs in different systems. According to one embodiment, a system's sound perception is captured by the target transfer function.

[0019] The vehicle has a transfer function. This is determined, among other things, by the audio playback system, the geometry, and the properties of the vehicle's materials. Furthermore, the position of the consumer can influence the vehicle's transfer function. Depending on the consumer's position relative to the audio playback system and the room geometry, sound waves of different frequencies are reflected differently. This creates a vehicle transfer function that can be dependent on the consumer's position.

[0020] The target transfer function provided in step b) describes the sound perception the consumer should have during playback in the vehicle. This can, for example, describe a target room and a target audio playback system. For example, this could be the recording room in a recording studio where an artist recorded the audio material, or a specific seating position in front of an orchestra recording a piece of music.

[0021] According to one embodiment, the target transfer function corresponds to the transfer function used by an artist during mastering of the audio material. For example, an artist is in a recording studio and records the audio material. During mastering, the audio material is edited until the artist is satisfied with the sound experience. This sound experience comprises the audio material and a transfer function that corresponds to the artist's listening situation when listening to the audio material. This sound experience is stored in the audio material and the target transfer function in such a way that when the audio material is played back with the imposed target transfer function and the vehicle transfer function removed, the artist's sound experience is authentically experienced by a consumer in the vehicle.For example, the desired transfer function is determined by measuring the impulse response or by measuring noise at the artist's listening position. Alternatively, the desired transfer function can correspond to any listener position, for example, in a concert, a theater, or similar.

[0022] In step c), a vehicle transfer function is provided. This has been determined in advance, for example, and is stored in an internal memory of the audio playback system. The vehicle transfer function describes the relationship between an audio material and the sound of the audio material perceived by a consumer in the vehicle.

[0023] By definition, every audio material is modified by the vehicle's transfer function during playback in the vehicle and perception by a consumer. This process is due to fundamental physical properties, such as electronic processing in components and sound propagation, and is unavoidable. Therefore, every audio material is imprinted with the vehicle's transfer function. In step d), this vehicle's transfer function is removed from the audio material through modification.

[0024] When the audio material is later played back, the vehicle transfer function is inevitably imprinted on the audio material. The removal performed beforehand results in the pure audio material without the vehicle transfer function for the consumer. This is comparable to multiplication by the inverse element. Multiplying an element by its inverse element produces the neutral element.

[0025] In step e), the audio material is modified so that the desired transfer function is imposed.

[0026] By playing the modified audio material through the vehicle's audio playback system in step f), a consumer perceives the audio material as if it were in the target transfer function. The consumer therefore no longer perceives the audio material as if they were in the vehicle with the audio playback system, but rather as if they were in the target room with the target audio playback system. By removing the vehicle's transfer function and imposing the target transfer function, the consumer's sound experience corresponds to that of the pure audio material with the target transfer function. The vehicle's transfer function balances itself with its inverse to the neutral element.

[0027] According to one embodiment, the playback of the modified audio material by the vehicle's audio playback system in step f) creates an authentic sound experience for a consumer in the vehicle that corresponds to the artist's sound experience during recording. For example, the artist is played their recorded audio material after mastering until it is optimal from their perspective. The target transfer function then corresponds to the artist's sound experience, for example, the playback of the audio material in a recording studio. According to one embodiment, the modified audio material creates an authentic sound experience for the consumer that corresponds to the artist's sound experience during recording.

[0028] According to this embodiment, the desired transfer function can be determined, for example, in a recording studio by determining an impulse response at the position of the artist.

[0029] According to one embodiment, the method creates an authentic sound experience for the consumer that is independent of the acoustics of the vehicle and the audio playback system. For example, the sound experiences in two different vehicles of an audio material modified by the method would be identical and both would correspond to an authentic sound experience of the artist. When modifying the audio material, physical limitations may restrict complete independence from the acoustics of the vehicle and the audio playback system.

[0030] According to one embodiment of the method, modifying the audio material by extracting a vehicle transfer function, in particular according to step d), comprises convolving the audio material with the inverse of the vehicle transfer function, and / or modifying the audio material by imposing the target transfer function, in particular according to step e), comprises convolving the audio material with the target transfer function.

[0031] Extracting the vehicle transfer function may involve convolving the audio material with the inverse of the vehicle transfer function. The inverse vehicle transfer function is uniquely determined by the vehicle transfer function. In particular, providing an inverse vehicle transfer function is mathematically identical to providing a vehicle transfer function.

[0032] The modification of the audio material, i.e., steps e) and d), can be performed simultaneously or in any order. In particular, the convolution of functions—for example, the audio material, the vehicle transfer function, and the target transfer function—is commutative and associative.

[0033] There are mathematical limits to convolution. When two functions are convolved along an axis, the resulting function cannot be shorter with respect to that axis. Therefore, when convolving transfer functions in audio applications, for example, the sound of an acoustically small room cannot be fully transferred to the sound of an acoustically large room.

[0034] The convolution of two functions corresponds to their multiplication in Fourier space. By transforming them into Fourier space, the functions can be multiplied and the resulting function can be transformed back. This method is particularly efficient in the fast Fourier transformation (FFT). The signal is transformed from time to frequency space and then linked with the other functions by multiplication.

[0035] According to one embodiment, steps d), e), and / or f) are performed using fast Fourier transforms (FFT). This can occur, in particular, in real time. The term "real time" is defined in DIN ISO / IEC 2382:2015: "Real time is the operation of a computer system in which programs for processing incoming data are constantly ready for operation, such that the processing results are available within a specified period of time. Depending on the application, the data can be generated according to a random temporal distribution or at predetermined times." The response time during modification and playback is not initially a criterion. What is important is that no delays occur during playback that could prevent continuous playback.However, when the modified audio material is played back through the vehicle's audio playback system, the modification and playback can also be performed in a very short period of time (response time), for example, less than one second. This short response time is virtually imperceptible to the consumer of the audio material and therefore corresponds to almost simultaneous processing of the audio material.

[0036] According to the invention, a plurality of vehicle transmission functions of the vehicle are provided, wherein the vehicle has a plurality of seat configurations describing the occupancy of existing vehicle seats, wherein each seat configuration is assigned a specific vehicle transmission function, and the method further comprises: g. Determining a seating configuration in the vehicle by detecting the presence of persons and / or objects; h. Selection of the specific vehicle transmission function associated with the specific seat configuration, wherein the modification of the audio material is carried out by extracting a vehicle transfer function, in particular according to step d), with the selected vehicle transfer function.

[0037] A vehicle can have multiple seats. For example, a car with two, four, or five seats can be occupied by people. Typically, the driver's seat is occupied during a trip, and optionally, other seats are occupied. In self-driving cars, however, any vehicle seat except the driver's seat can be occupied during a trip.

[0038] The configuration of occupied and unoccupied vehicle seats constitutes a seating configuration. A vehicle seat can also be considered occupied by an object, such as a child seat. Typical seating configurations include a vehicle in which only the driver's seat is occupied, or a vehicle in which both the driver's seat and the front passenger seat are occupied.

[0039] According to the invention, in step g), the seat configuration in the vehicle is determined by detecting the presence of people and / or objects. The determination can be made manually by the consumer, for example, via a touchpad, buttons, dials, gestures, and / or voice control. The term "manual determination" should be understood to mean that the selection is made actively by the user. In particular, however, the detection can also be made automatically by sensors, for example, mass-sensitive sensors or ultrasonic sensors, on the vehicle seats.

[0040] According to the invention, a plurality of vehicle transmission functions are and / or will be provided, each of which is assigned a specific vehicle transmission function to a specific seat configuration. The vehicle transmission function depends on the consumer's position in the vehicle. The playback of the audio material in the vehicle is altered by different room acoustics at the consumer's positions. Therefore, different vehicle transmission functions can be provided, enabling an optimal sound experience for different vehicle seat occupancies.

[0041] A vehicle transmission function is selected based on the specific seat configuration. For example, several vehicle transmission functions are stored in the audio playback system's memory, with each specific seat configuration assigned to a vehicle transmission function.

[0042] Vehicle transfer functions can be determined, for example, by measuring white noise over a wide frequency range. For a given seating configuration, the noise signal in the vehicle is generated by the audio playback system. Simultaneously, the audio signal is measured using a microphone at a specific position in the vehicle. By cross-correlating the measured audio signal with the output audio signal, the vehicle transfer function, in particular the impulse response, of the vehicle at that position with the given seating configuration can be determined.

[0043] The vehicle transfer function can be optimized for a specific position in the vehicle at a given seating position. For example, this could be the driver's position or a position in the rear seat occupied by a passenger. The vehicle transfer function can also be set to an average value between multiple positions, so that multiple occupied seats create an optimal sound experience for consumers. Optimization may be possible for only one seat when multiple seats are occupied.

[0044] In this context, it is conceivable that certain seats in different seating configurations could be acoustically preferred, meaning that the audio consumer's sound experience is optimized for a specific vehicle occupancy. For example, if the vehicle is used for chauffeur service, the rear left seat position could be acoustically preferred, ensuring that the person sitting there experiences an optimal sound experience.

[0045] The seating configuration may influence the vehicle's transmission function, even when optimized for the same seat, since an additional person or object can lead to altered room acoustics. Sound absorption and reflection change depending on the vehicle's occupancy.

[0046] According to the present invention, steps a) and b) are performed simultaneously by providing an audio file with payload data and metadata, wherein the payload data comprises the audio material and the metadata comprises the target transmission function.

[0047] Furthermore, an audio file comprising payload data and metadata is proposed. The payload data comprises audio material, and the metadata comprises a target transmission function. The audio file can be executed according to the method described above. Any embodiments of the method can be executed with the audio file.

[0048] Furthermore, a computer program product is proposed that can be loaded directly into the internal memory of a digital computing device, in particular a computing device permanently installed in a car, and that comprises software code sections with which the steps of the method described above are executed when the computer program product is running on the computing device. Any embodiments of the method can be executed by a computer program product.

[0049] Furthermore, a vehicle, in particular a passenger car, comprising a digital computing device which is configured to execute the computer program product is proposed.

[0050] Furthermore, a vehicle, in particular a passenger car, is proposed. The vehicle has an audio playback system comprising: a computing device with a memory; and one or more vehicle transmission functions of the vehicle stored in the memory; wherein the computing device is configured to execute the steps of the method described above. Any embodiments of the method can be performed by the computing device.

[0051] According to a further development, several vehicle transmission functions of the vehicle are stored in the memory, and the computing device is configured to perform a selection from the vehicle transmission functions. A selection can be made, in particular, according to the steps of the method described above.

[0052] According to one embodiment, the vehicle has a sensor device configured to determine the seat configuration in the vehicle. These sensors include, for example, mass sensors, microwave sensors, or other common sensors for determining seat occupancy in a vehicle. A predefined seat configuration is selected from the seat occupancy.

[0053] According to a further developed embodiment, the computing device is connected to the sensor device such that the computing device can process the specific seat configuration, and the vehicle transfer function associated with the specific seat configuration is selected for modification. In particular, this can be done according to the above-described embodiments of the method and / or steps g) and h).

[0054] The audio playback system may also feature additional settings. These include, for example, manual or automatic adjustment of sound and volume. This includes, for example, amplifying and / or reducing the bass and / or treble of a piece of content using an equalizer, adjusting the stereo settings of the audio system to the user's seating position on one side of the vehicle, and / or setting different presets for the audio system's acoustic settings. Description of the characters

[0055] The accompanying drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Like reference characters designate similar parts. Fig. 1 shows a flowchart illustrating an embodiment of the method.

[0056] The Fig. Figure 1 shows a flowchart of an embodiment of the method for playing audio material in a vehicle, in particular in a passenger car. The vehicle has an audio playback system. The method comprises the following steps: a. Providing audio material; b. Providing a target transfer function; c. Providing a vehicle transfer function of the vehicle; d. Modifying the audio material by removing a vehicle transmission function; e. Modifying the audio material by imposing the desired transfer function; f. Playing the modified audio material through the vehicle’s audio playback system.

[0057] The flowchart shows a possible and preferred sequence of steps, which is not binding for all embodiments.

[0058] Steps g) and h) are optional. Several vehicle transmission functions of a passenger car are used: HPKW1(t); HPKW2(t); and HPKW3(t) provided. In this exemplary embodiment, three vehicle transmission functions are available. Furthermore, several seat configurations SK1; SK2; SK3; and SK4 are provided, which are related to the number of people in the vehicle and their positions. Each seat configuration SK1; SK2; SK3; SK4 is assigned a vehicle transmission function. HPKW1(t); HPKW2(t); HPKW3(t) This assignment does not necessarily have to be unique, nor does it have to be unambiguous, i.e. a vehicle transfer function HPKW1(t); HPKW2(s); HPKW3(t) Several seat configurations SK1; SK2; SK3; SK4 and vice versa can also be assigned. In this exemplary embodiment, for example, the vehicle transmission function HPKW3(t) two seat configurations SK3; SK4 are assigned. If a seat configuration SK1; SK2; SK3; SK4 is assigned several vehicle transmission functions HPKW1(t); HPKW2(t); HPKW3(t) are assigned, an additional manual selection from the assigned vehicle transmission function HPKW1(t); HPKW2(t); HPKW3(t) take place.

[0059] The vehicle transmission function HPKW1(t); HPKW2(t); HPKW3(t), the target transfer function H SOLL (t) and the audio material X(t) are, according to this representation, functions of time t.

[0060] One of the seat configurations SK1; SK2; SK3; SK4 is determined automatically or manually entered by the vehicle user. In this exemplary embodiment, four seat configurations SK1; SK2; SK3; SK4 are specified. However, in other exemplary embodiments, more than four seat configurations are possible. For example, the number of seat configurations can correspond to the permutations of all occupied and unoccupied seats in the vehicle.

[0061] Selecting the vehicle transmission function HPKWj(t) is carried out in step h) by the previously determined seat configuration SK1; SK2; SK3; SK4. The selected vehicle transmission function HPKWj(t) is marked with j. By removing the selected vehicle transfer function HPKWj(t) and the imposition of the target transfer function H SOLL(t) an optimal sound experience is created for the consumers in the vehicle. The vehicle transmission function can be optimized for only one person when the vehicle is occupied by several people, or an average value is found to optimize all seats. In this case, the selected vehicle transmission function HPKWj(t) and the actual vehicle transfer function for a selected consumer may not match. In this case, a portion of the vehicle transfer function remains in the audio material when the vehicle transfer function is extracted from the audio material. It may be up to the consumer or the presets to select a vehicle transfer function that is optimal for all or for a specific position.

[0062] The vehicle transmission function HPKWj(t) depends on the vehicle, in particular the audio playback system and the room acoustics and the seating configuration. According to one embodiment, the vehicle transmission function HPKWj(t) constant throughout a trip and is provided at the beginning of a trip. For example, step c) can be performed at the beginning of a vehicle occupancy with consumers. In particular, a selection from several vehicle transfer functions can be made according to steps g) and h).

[0063] In contrast to the vehicle transmission function HPKWj(t) The audio material generally varies during a journey. For example, the consumer listens to different pieces of music. While the vehicle is moving, steps a), b), d), e), and f) are then repeated periodically.

[0064] In the Fig.1 an audio file is provided, this has payload data and metadata, where the payload data has audio material X (t), and the metadata has a target transfer function H SOLL (t). Steps a) and b) of the process are therefore carried out simultaneously according to the invention.

[0065] The modification by removing the vehicle transfer function in step d) and the modification by imposing the target transfer function e) generate the modified audio material HPKWj−1(t)∗X(t)∗HSOLL(t). The extraction in the modified audio material is achieved by convolving the audio material X(t) with the inverse vehicle transfer function HPKWj−1(t) The imprinting is done by convolving the audio material X(t) with the target transfer function H SOLL (t) with subsequent inverse transformation. The symbol ∗ specifically represents a convolution.

[0066] The modification in steps d) and e) can be carried out in particular by multiplying with the respective Fourier transforms of the audio material X(t), the target transfer function H SOLL (t), and the inverse vehicle transfer function HPKWj−1(t) happen.

[0067] The modified audio material HPKWj−1(t)∗X(t)∗HSOLL(t) is played in step f) through the vehicle's audio playback system and perceived by the consumer in the vehicle. During playback, the vehicle's transmission function is inevitably applied to the modified audio material. HPKWj−1(t)∗X(t)∗HSOLL(t) By removing the vehicle transmission function HPKWj(t) and the imposition of the target transfer function H SOLL (t) the consumer's sound experience corresponds to that of the pure audio material X(t) with the target transfer function H SOLL(t). The vehicle transfer function is equal to its inverse HPKWj−1(t) to the neutral element.

[0068] Steps d), e), and f) can be performed by fast Fourier transformation in real time within a given time window and / or by nearly simultaneous processing of the incoming audio material. For example, it is conceivable that a received radio broadcast contains, in addition to the audio material X(t), a target transfer function H SOLL (t) and this is modified almost immediately during playback. A short delay due to a short processing time is virtually unnoticeable by the consumer.

[0069] The flowchart presented here also represents an algorithm of a computer program product. This can be loaded directly into the internal memory of a digital computing device, in particular a computing device permanently installed in a car, and comprises software code sections with which steps a) to h) are executed, for example, in the order shown, when the computer program product is running on the computing device. In particular, steps a), b), d), e), and f) can be repeated periodically.

Claims

[1] Method for reproducing audio material in a vehicle, in particular in a passenger car, wherein the vehicle has an audio reproduction system and the method comprises the following steps: a. Providing audio material (X(t)); b. Providing a target transfer function (H SOLL (t)); wherein steps a) and b) are performed simultaneously by providing an audio file with payload data and metadata, wherein the payload data comprises the audio material and the metadata comprises the target transmission function. c. Providing multiple vehicle transmission functions (HPKW1(t); HPKW2(t); HPKW3(t)) of the vehicle, wherein the vehicle has several seat configurations (SK1; SK2; SK3; SK4) describing the occupancy of existing vehicle seats, wherein each seat configuration (SK1; SK2; SK3; SK4) is assigned to a specific vehicle transmission function (HPKW1(t); HPKW2(t); HPKW3(t)) is assigned; g. Determining a seating configuration (SK1; SK2; SK3; SK4) in the vehicle by detecting the presence of persons and / or objects; h. Selection of the specific vehicle transmission function (HPKW1(t); HPKW2(t); HPKW3(t)), which is assigned to the specific seat configuration (SK1; SK2; SK3; SK4); d. Modify the audio material by extracting it with the selected vehicle transfer function (HPKW1(t); HPKW2(t); HPKW3(t)); e. Modifying the audio material (X(t)) by imposing the desired transfer function (H SOLL (t)); f. Playing the modified audio material through the vehicle’s audio playback system. [2] The method of claim 1, wherein modifying the audio material by extracting a vehicle transfer function (HPKW1(t); HPKW2(t); HPKW3(t)), in particular according to step d), a convolution of the audio material with the inverse of the vehicle transfer function (HPKW1(t); HPKW2(t); HPKW3(t)) and / or wherein modifying the audio material by imposing the desired transfer function (H SOLL (t)), in particular according to step e), a convolution of the audio material with the target transfer function (H SOLL (t)). [3] Method according to claim 2, wherein steps d), e) and / or f) are carried out, in particular in real time, by fast Fourier transforms (FFT). [4] Computer program product which can be loaded directly into an internal memory of a digital computing device, in particular a computing device permanently installed in a car, and which comprises software code sections with which the steps according to one of claims 1 to 3 are carried out when the computer program product is running on the computing device. [5] Vehicle, in particular a passenger car, comprising a digital computing device which is configured to execute the computer program product according to claim 4. [6] Vehicle, in particular a car, comprising an audio playback system, comprising: - a computing device with a memory; and - one or more vehicle transmission functions stored in the memory (HPKW1(t); HPKW2(t); HPKW3(t)) of the vehicle; wherein the computing device is configured to perform the steps according to the method of any one of claims 1 to 3. [7] A vehicle according to claim 6, further comprising: - a sensor device configured to determine the seat configuration (SK1; SK2; SK3; SK4) in the vehicle. [8] The vehicle according to claim 7, wherein the computing device is connected to the sensor device such that the computing device can process the determined seat configuration (SK1; SK2; SK3; SK4), and the vehicle transfer function associated with the determined seat configuration (SK1; SK2; SK3; SK4) (HPKW1(t); HPKW2(t); HPKW3(t)) is selected for modification.

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