Patent Application
20230362545
The present invention relates to the field of electroacoustics and in particular to concepts for recording and reproducing acoustic signals.
Typically, acoustic scenes are recorded by using a set of microphones. Each microphone outputs a microphone signal. For an audio scene of an orchestra, for example, 25 microphones can be used. Then, a sound engineer performs mixing of the 25 microphone output signals, for example into a standard format, such as a stereo format, a 5.1, 7.1, 7.2 or another corresponding format. In a stereo format, for example, the sound engineer or an automatic mixing process generates two stereo channels. In a 5.1 format, mixing results in five channels and one subwoofer channel. Analogously, in a 7.2 format, for example, a mixture into seven channels and two subwoofer channels is performed. When the audio scene is to be rendered in a reproduction environment, a mixing result is applied to electrodynamic loudspeaker. In a stereo reproduction scenario, two loudspeakers exist, wherein the first loudspeaker receives the first stereo channel and the second loudspeaker receives the second stereo channel. In a 7.2 reproduction format, for example, seven loudspeakers exist at predetermined positions and, above that, two subwoofers that can be placed in a relatively arbitrary manner. The seven channels are applied to the respective loudspeakers and the two subwoofer channels are applied to the respective subwoofers.
Using a single microphone arrangement for detecting audio signals and the usage of a single loudspeaker arrangement for reproducing the audio signals typically neglects the true nature of the loud sources. European patent EP 2692154 B1 describes a set for detecting and reproducing an audio scene where not only the translation is recorded and reproduced but also the rotation and above that the vibration. Thus, a sound scene is not only reproduced by a single detection signal or a single mixed signal but by two detection signals are two mixed signals that are, on the one hand, recorded simultaneously and that are, on the other hand, reproduced simultaneously. This achieves that different emission characteristics from the audio scene can be recorded compared to a standard recording and can be reproduced in a reproduction environment.
For this, as illustrated in the European patent, a set of microphones is placed between the acoustic scene and an (imaginary) auditorium to detect the “conventional” or translation signal that is characterized by high directivity or high Q.
Above that, a second set of microphones is placed above or on the side of the acoustic scene to record a signal with low Q or low directivity, which is to map the rotation of the soundwaves in contrast to the translation.
On the reproduction side, respective loudspeakers are placed at the typical standard positions, each of them having an omnidirectional arrangement to reproduce the rotational signal and a directional arrangement to reproduce the “conventional” translatory sound signal. Further, a subwoofer exists either at each of the standard positions or only a single subwoofer at any location.
European patent EP 2692144 B1 discloses a loudspeaker for reproducing, on the one hand, the translatory audio signal and, on the other hand, the rotatory audio signal. Thus, the loudspeaker has an omnidirectionally emitting arrangement on the one hand and a directionally emitting arrangement on the other hand.
European patent EP 2692151 B1 discloses an electret microphone that can be used for recording the omnidirectional or the directional signal.
European patent EP 3061262 B1 discloses an earphone and a method for producing an earphone generating both a translatory sound field as well as a rotatory sound field.
European patent application EP 3061266 AO intended for grant discloses a headphone and a method for generating a headphone that is configured to generate the “conventional” translatory sound signal by using a first transducer, and to generate the rotatory sound field by using a second transducer arranged perpendicular to the first transducer.
Recording and reproducing the rotatory sound field in addition to the translatory sound field results in a significantly improved and therefore high-quality audio signal perception that almost gives the impression of a live concert although the audio signal is reproduced by loudspeakers, headphones or earphones.
This results in a sound experience that is almost indistinguishable from the original sound scene where the sound is not emitted by loudspeakers, but by musical instruments or human voices. This is obtained by considering that sound is emitted not only in a translatory but also rotatory and possibly vibratory manner and is hence to be recorded and reproduced accordingly.
It is the object of the present invention to provide an improved concept for recording the entire sound on the one hand and for reproducing this entire recorded sound on the other hand.
According to an embodiment, a microphone may have: a first partial microphone with a first diaphragm pair having a first diaphragm and a second diaphragm that are arranged opposite each other; and a second partial microphone with a second diaphragm pair having a third diaphragm and a fourth diaphragm that are arranged opposite each other, wherein the first diaphragm pair is arranged such that the first diaphragm and the second diaphragm are deflectable along a first spatial axis, wherein the second diaphragm pair is arranged such that the third diaphragm and the fourth diaphragm are deflectable along a second spatial axis and wherein the second spatial axis differs from the first spatial axis.
According to another embodiment, a reproduction apparatus for an acoustic signal may have: an interface for receiving a first electric signal corresponding to an acoustic common mode signal, a separate second electric signal corresponding to a first acoustic differential signal and a separate third electric signal corresponding to a second acoustic differential signal; first loudspeaker means for reproducing the first electric signal as acoustic common mode signal; and second loudspeaker means for reproducing the second electric signal and the third electric signal as acoustic differential signals, wherein the second loudspeaker means differs from the first loudspeaker means.
According to another embodiment, a mobile device may have: an interface for receiving at least a first electric signal corresponding to an acoustic common mode signal, at least a separate second electric signal corresponding to a first acoustic differential signal and at least a separate third electric signal corresponding to a second acoustic differential signal; wherein the at least first electric signal is a microphone signal recorded by a microphone arrangement or a synthesized microphone signal, wherein the at least second electric signal is a first differential output signal and the at least third electric signal is a second differential output signal, a renderer configured to generate the microphone signal by using a virtual position of the real or virtual microphone and by using information on the different loudspeaker positions, to generate a loudspeaker signal for each of a first plurality of loudspeakers, or to render several microphone signals by using virtual positions of the real or virtual microphones and by using different head-related transfer functions that depend on the positions and a respective side of a headphone, to generate a headphone signal for each side of two headphone sides, and to render the first differential output signal and the second differential output signal by using the position of the real or virtual microphone and by using the different loudspeaker positions, to generate a loudspeaker signal for each loudspeaker of a plurality of second loudspeakers, or to render respective first differential output signals and respective second differential output signals by using the virtual positions of the real or virtual microphones and by using different head-related transfer functions that depend on the positions and a respective side of a headphone, to generate a headphone signal for each side of two headphone sides; and output means for outputting generated signals to the loudspeakers or headphone sides.
According to still another embodiment, a method for recording an acoustic signal may have the steps of: operating a first partial microphone with a first diaphragm pair having a first diaphragm and a second diaphragm that are arranged opposite each other; and operating a second partial microphone with a second diaphragm pair having a third diaphragm and a fourth diaphragm that are arranged opposite each other, wherein the first diaphragm pair is arranged such that the first diaphragm and the second diaphragm are deflectable along a first spatial axis, wherein the second diaphragm pair is arranged such that the third diaphragm and the fourth diaphragm are deflectable along a second spatial axis and wherein the second spatial axis differs from the first spatial axis.
According to another embodiment, a method for reproducing for an acoustic signal may have the steps of: receiving a first electric signal corresponding to an acoustic common mode signal, a separate second electric signal corresponding to a first acoustic differential signal and a separate third electric signal corresponding to a second acoustic differential signal; reproducing the first electric signal as acoustic common mode signal with first loudspeaker means; and reproducing the second electric signal and the third electric signal as acoustic differential signals with second loudspeaker means, wherein the second loudspeaker means differs from the first loudspeaker means.
Another embodiment may have a non-transitory digital storage medium having stored therein a computer program for performing a method for recording an acoustic signal, having the steps of: operating a first partial microphone with a first diaphragm pair having a first diaphragm and a second diaphragm that are arranged opposite each other; and operating a second partial microphone with a second diaphragm pair having a third diaphragm and a fourth diaphragm that are arranged opposite each other, wherein the first diaphragm pair is arranged such that the first diaphragm and the second diaphragm are deflectable along a first spatial axis, wherein the second diaphragm pair is arranged such that the third diaphragm and the fourth diaphragm are deflectable along a second spatial axis and wherein the second spatial axis differs from the first spatial axis, when the computer program is run by a computer or processor.
Another embodiment may have a non-transitory digital storage medium having stored therein a computer program for performing a method for reproducing for an acoustic signal, having the steps of: receiving a first electric signal corresponding to an acoustic common mode signal, a separate second electric signal corresponding to a first acoustic differential signal and a separate third electric signal corresponding to a second acoustic differential signal; reproducing the first electric signal as acoustic common mode signal with first loudspeaker means; and reproducing the second electric signal and the third electric signal as acoustic differential signals with second loudspeaker means, wherein the second loudspeaker means differs from the first loudspeaker means, when the computer program is run by a computer or processor.
According to the invention, not only a single rotational signal is recorded as in the known technology, but measures are taken to detect and reproduce the direction of the rotational signal. According to the invention, it has been found that the rotation of the sound field or the rotation of the molecules existing in air, which takes place in addition to the translation, has a directional component, by the detection and reproduction of which an additional sound experience can be obtained, which is even closer to the original natural sound scenario.
For that purpose, a microphone includes a first partial microphone with a first diaphragm pair with diaphragms arranged opposite each other and a second partial microphone with a second diaphragm pair also comprising diaphragms arranged opposite each other. The first diaphragm pair is oriented such that the diaphragms of the first diaphragm pair are deflectable along a first spatial axis and the second diaphragm pair is arranged such that the diaphragms of the second diaphragm pair is deflectable along a second spatial axis that differs from the first spatial axis. Advantageously, additionally, a third partial microphone having a third diaphragm pair is provided, wherein the diaphragms of the third diaphragm pair are deflectable along a third spatial axis that differs from the first and second spatial axis, wherein the spatial axes are advantageously orthogonal or essentially orthogonal to each other.
In advantageous embodiments, an individual differential output signal is derived from each diaphragm pair of the microphone by combining the diaphragm output signals of the two diaphragms arranged opposite each other, by using a change of the phase relation and advantageously a phase inversion of one of the two diaphragm output signals. Thereby, an individual differential signal is generated for each spatial axis, which reproduces a respective directional component of the rotational signal or generally a differential signal in each spatial axis.
Such a microphone having two or three partial microphones can advantageous also be used to generate not only the novel differential signals, but also typical component signals, as they are known, for example, in the field of ambisonics technology. For this, the diaphragm output signals of the two opposite diaphragms can be added up to obtain a respective ambisonics component. Above that, it is of advantage that the microphone additionally detects an omnidirectional component that is obtained either by an individual omnidirectional microphone or by adding up the three directional components.
Thereby, a microphone according to an advantageous embodiment of the present invention does not only generate the three novel differential signals in x-direction, y-direction, and z-direction, but also the four components B (or W) X, Y and Z of a known first order ambisonics signal or a B-format signal.
Thereby, according to the invention, further improvement of the acoustic quality when reproducing such signals is obtained.
On the reproduction side, it is of advantage to reproduce, in addition to the conventional or common mode signal, at least two and advantageously all three differential signals or differential mode signals by means of a loudspeaker system comprising one or several loudspeakers for reproducing the conventional CM signal, and further comprising a second or a second and a third loudspeaker to reproduce the differential signal. In particularly advantageous embodiments, three differential signals are provided and the second loudspeaker means for reproducing the three differential signals all in all includes at least six transducers that are arranged in three different spatial directions, such that the differential signals recorded in different spatial directions are reproducing the same direction on the reproduction side where they have been originally recorded.
Depending on the implementation, several simplifications can be made to establish a trade-off between efforts on the one hand and achieved audio quality on the other hand.
In advantageous embodiments, rendering a microphone signal in a reproduction environment is provided where loudspeakers are placed at specific known positions. For this, on the one hand, a conventional translatory microphone signal is used, which can consist of an omnidirectional component and parametric side information, or which exists as full B-format signal. For rendering the microphone signal on the individual loudspeakers, advantageously, vector-based amplitude panning (VBAP) is performed, for which respective weighting factors from the directional information included in the side information or derived from the B-format signal are used.
Advantageously, these weighting factors are also used not only to render the conventional translatory audio signal or to “to distribute” the same to the individual loudspeakers. Instead, these weighting factors are also used to weight or “distribute” the novel differential signals in the different spatial axes to the different loudspeakers. Thus, from a complete microphone signal generated at a specific recording position that consists of a conventional omnidirectional component and three directional components and/or (parametric) metadata comprising directional information and that additionally comprises the novel two or three differential signals of the two or three spatial axes, a complete reproduction can be generated. A loudspeaker at one of the loudspeaker positions includes a conventional translatory element that is supplied with the rendered translatory audio signal for this loudspeaker at this loudspeaker position and additionally, for each of the differential signals, a different signal transducer arranged according to the spatial direction of the differential signal that can be configured, for example, as double diaphragm without housing who's emission direction is arranged in the respective spatial axis or spatial direction.
Embodiments of the present invention will be discussed below in more detail with reference to the accompanying drawings, in which:
Further,
Further,
As shown further for example in
Above that, the second partial microphone 2, which includes the two diaphragms 13, 14, also comprises output lines to provide a third diaphragm signal from the third diaphragm 13 and a fourth diaphragm signal from the fourth diaphragm 14. Further, depending on the implementation, the third partial microphone is also configured to provide a fifth diaphragm signal in response to a deflection of the fifth diaphragm and to provide a sixth diaphragm signal in response to a deflection of the diaphragm 16 in the third spatial axis, i.e., for example in the z direction.
The first partial microphone, the second partial microphone and, if present, the third partial microphone are configured to combine the respective diaphragm signals of the diaphragms of the diaphragm pair. This is illustrated schematically in
For generating a differential signal as, for example, the differential output signal Diffx 21, the combiner 30 is configured to combine the first diaphragm signal 11 and the second diaphragm signal 12 with a modified first phase relation. Thus, the first differential output signal Diffx 21 is allocated to the first spatial axis, for example the x-axis.
Further, the second partial microphone is configured to combine the second diaphragm signal 13 and the third diaphragm signal 14 with a modified second phase relation to provide a second differential output signal Diffy shown at 22 in
Advantageously, the combination is performed such as it is schematically illustrated in
The phase changing means 41 is provided to change the second phase relation for the second partial microphone such that an addition as schematically show in
Above that, also for the third partial microphone, a phase changing element 42 is provided that changes the third phase relation between the diaphragm signals 15, 16 and adds the signals with modified third phase relation to obtain the third differential output signal Diffz 23 of
As illustrated already based on reference number 24 in
The same is performed to obtain a conventional y-directional component of a directional microphone by adding the diaphragm signals of the second diaphragm pair 13, 14 with the original phase relation, i.e., without the effect of a phase member 41. Analogously, an X component of a directional microphone is obtained when the two directional characteristics, i.e., for the front diaphragm 11 and the rear diaphragm 12 are added, again without effect of a phase element 40.
An entire omnidirectional signal can be obtained when all six diaphragm signals are added in their original first second and third phase relation, wherein this omnidirectional signal, for example, is referred to as W signal or P signal as it is also known from ambisonics technology or for a signal in B-format which comprises an omnidirectional component and directional component in X-direction, a directional component in Y-direction and a Z-component in the Z-direction.
In contrary to such a B-format signal, the inventive microphone provides, in addition to these signals or as an alternative to these signals, differential signals for the individual directions, i.e., signals that result when a difference between the front and the rear directional characteristic is formed to detect the sound field which actually prevails on the side with respect to diaphragms that are arranged opposite each other, i.e., above and below the two diaphragms 11, 12 of
The change between the first phase relation on the left in
For combining such a signal, the combiner 30 is configured as illustrated in
Although such an individual combiner is illustrated in
The three partial microphones are configured such that each diaphragm comprises a counterelectrode, such that six individual diaphragms and six respective counterelectrodes exist overall in the inventive microphone shown in
For other arrangements where the exact rectangular arrangement between the individual microphones is not important, the microphones can also be arranged at an angle between 70° and 110° or the third holder 53 or the third partial microphone can be arranged at an angle between 30° and 60° with respect to the first holder or the second holder.
The microphone holder 50 is further mounted to a tripod 54 shown schematically in
Instead of the elastic clips illustrated in
For generating the rotational vibration, which significantly improves the audio quality, also in a sound field, the inventive microphone provides the differential signals in three spatial directions Diffx 21, Diffy 22 and Diffz 23. Analogously to the omnidirectional signal 24a, an omnidirectional differential signal 21a could also be generated, which can be obtained by adding the three directional differential signals.
Thereby, the present invention provides a novel B-format for the rotational vibrations or the differential sound field.
Above that, the reproduction apparatus includes first loudspeaker means 131a, 132a, 133a, 134a, 135a, for reproducing the first electric signal, wherein the first loudspeaker means is configured to generate translational vibrations in response to the first electric signal. Further, the reproduction apparatus includes second loudspeaker means 131b, 132b, 133b, 134b, 135b for reproducing the second and third electric signals, wherein the second loudspeaker means differs from the first loudspeaker means.
Particularly, the second loudspeaker means is configured to generate rotational vibrations in response to the second signal, i.e., to a first differential signal and to the third electric signal, i.e., in response to the second differential signal. In other words, the second loudspeaker means is configured to generate sound with a second directional characteristic that differs from a first directional characteristic that is allocated to the first loudspeaker means.
In the embodiment illustrated in
The renderer 120 operates separately for the common mode signals and the differential signals. In the example shown in
Although rendering of loudspeaker signals has been described above, the invention can also be used for rendering headphone signals from many different microphone signals at many different positions. For each “path” from a microphone position to one side of the headphone, i.e., to left or right, a head-related transfer function exists. The respective signal is provided with the same, to add then the respectively provided signals for each side to obtain the final headphone signal for the respective side.
Thus, the renderer 120 is configured to render 120 the microphone signal by using a virtual position 122 of the real or virtual microphone and by using information 121 on the different loudspeaker positions to generate a loudspeaker signal 60, 70, 80, 90, 100 for each of a first plurality of loudspeakers, or to render 120 several microphone signals by using virtual positions of the real or virtual microphones and by using different head-related transfer functions (HRTF) that depend on the positions and the respective side of a headphone to generate a headphone signal 60, 70, 80, 90, 100 for each side of two headphone sides to render 120 the first differential output signal 21 and the second differential output signal 22 by using the position of the real or virtual microphone and by using the different loudspeaker positions, to generate a loudspeaker signal 61, 71, 81, 91, 101 for each loudspeaker of a plurality of second loudspeakers, or to render 120 respective first differential output signals and respective second differential output signals by using the virtual positions of the real or virtual microphones and by using different head-related transfer functions (HRTF) that depend on the positions and the respective side of a headphone, and the same includes output means for outputting generated signals to the loudspeakers or the headphone sides.
Loudspeakers as known, for example, from EP 269244 B1 have respective inputs for the respective acoustic transducers. The transducer for the translation signal, i.e., for the first electric signal representing a common mode signal is illustrated in
Depending on the implementation, the respective electric signals that are received by the interface 110 can also be output directly via loudspeaker, i.e., without using a renderer 120. In that case, for example, a respective microphone can be placed at each “loudspeaker position” in a studio environment. Then, for each microphone position, a microphone signal is obtained, which can then be reproduced via a loudspeaker in a reproduction scenario, which would be arranged at a position in the auditorium corresponding to the microphone position. Then, no renderer 120 is needed. Instead, the signals fed into the interface 110 would be fed directly or possibly after amplification into the loudspeakers, as shown in
In one embodiment, the first loudspeaker means that is implemented in each of the five loudspeakers 131, 132, 133, 134, 135 is configured to comprise a first transducer for acoustic reproduction of the electric common mode signal, wherein the first transducer is configured to emit in a first direction. The second loudspeaker means includes a second transducer for acoustic reproduction of the first differential signal, wherein the second transducer is configured to emit in a second direction differing from the first direction. Above that, the second loudspeaker means also comprises a third transducer for acoustically transducing the second differential signal, wherein the third transducer is configured to emit in a third direction differing from the first and the second direction or differing from the second direction and being essentially equal to the first direction. This implementation also includes the case that the rotational vibration has a component in the direction in which the conventional translational vibration takes place.
As shown in
Depending on the implementation, the first loudspeaker means is provided with a frequency-separating means 162, a tweeter 161 and a woofer or midrange speaker 163 as illustrated at 131a in
The individual differential transducers 170a, 170b, 170c, indicated at 131b in
On the other hand, the differential signal renderer obtains merely the differential signals in x-direction 20, in y-direction 22 and z-direction 23. Above that, the differential signal renderer is provided with the rendering setting 121 that the common mode renderer has determined from the B-format signals for a specific reproduction arrangement. Therefore, rendering the differential signals is efficiently possible as it takes place with the same rendering settings 121 and in particular with respective panning weights 121a as illustrated in
Further, in contrast to rendering for the common mode signal, for reducing the effort, it is of advantage that the differential signal renderer merely generates a rendered left differential signal, a rendered central differential signal and a rendered right differential signal and that then the rendered differential signal for rear left (LS) and rear right (RS) is derived from the rendering signal for left or from the rendered signal for right. A possible way of generating consists in the embodiment of
Separating the common mode signal in individual sound sources can be performed by any source separation algorithms. An advantageous embodiment is to subject the signal to a time-frequency transformation, wherein a plurality of subbands is generated for a sequence of subsequent frames, and wherein it is then determined, per time-frequency bin of the sequence of frames, from what direction the sound in a microphone signal originates. This determination of the direction can be obtained by simply reading out already provided metadata that indicate a DOA direction with an azimuth angle and an elevation angle per time-frequency bin. Additionally, depending on the implementation, diffuseness information can be provided in addition to the DOA information per time-frequency bin as is known from audio signal processing that is known among persons skilled in the art by the name DAC (directional audio coding).
If, however, no such metadata exists, but a full B-format signal as discussed based on
Thus, in this embodiment, processing the upper half of
Depending on the implementation, the renderer 120 can be implemented together with the interface 121, for example, in a mobile phone software or generally in a mobile device, wherein the signals for the individual loudspeakers 131, 132, 133, 134, 135 can be provided, for example, via wireless transmission to the respective loudspeakers. The mobile device is, indicated, for example as 200 in
Although some aspects have been described in the context of an apparatus, it is obvious that these aspects also represent a description of the corresponding method, such that a block or device of an apparatus also corresponds to a respective method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or detail or feature of a corresponding apparatus. Some or all of the method steps may be performed by a hardware apparatus (or using a hardware apparatus), such as a microprocessor, a programmable computer or an electronic circuit. In some embodiments, some or several of the most important method steps may be performed by such an apparatus.
Depending on certain implementation requirements, embodiments of the invention can be implemented in hardware or in software. The implementation can be performed using a digital storage medium, for example a floppy disk, a DVD, a Blu-Ray disc, a CD, an ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, a hard drive or another magnetic or optical memory having electronically readable control signals stored thereon, which cooperate or are capable of cooperating with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
Some embodiments according to the invention include a data carrier comprising electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
Generally, embodiments of the present invention can be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer.
The program code may, for example, be stored on a machine readable carrier.
Other embodiments comprise the computer program for performing one of the methods described herein, wherein the computer program is stored on a machine readable carrier.
In other words, an embodiment of the inventive method is, therefore, a computer program comprising a program code for performing one of the methods described herein, when the computer program runs on a computer.
A further embodiment of the inventive method is, therefore, a data carrier (or a digital storage medium or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein.
A further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may, for example, be configured to be transferred via a data communication connection, for example via the Internet.
A further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein.
A further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.
A further embodiment in accordance with the invention includes an apparatus or a system configured to transmit a computer program for performing at least one of the methods described herein to a receiver. The transmission may be electronic or optical, for example. The receiver may be a computer, a mobile device, a memory device or a similar device, for example. The apparatus or the system may include a file server for transmitting the computer program to the receiver, for example.
In some embodiments, a programmable logic device (for example a field programmable gate array, FPGA) may be used to perform some or all of the functionalities of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein. Generally, the methods may be performed by any hardware apparatus. This can be a universally applicable hardware, such as a computer processor (CPU) or hardware specific for the method, such as ASIC.
While this invention has been described in terms of several embodiments, there are alterations, permutations, and equivalents which will be apparent to others skilled in the art and which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102021200555.1 | Jan 2021 | DE | national |
This application is a continuation of copending International Application No. PCT/EP2022/051252, filed Jan. 20, 2022, which is incorporated herein by reference in its entirety, and additionally claims priority from German Application No. 102021200555.1, filed Jan. 21, 2021, which is also incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2022/051252 | Jan 2022 | US |
| Child | 18352685 | US |
