TWI828041B - Device and method for controlling a sound generator comprising synthetic generation of the differential - Google Patents

Abstract

Device (1) for controlling a sound generator (50, 60) having a first transducer (51) and a second transducer (52) for a left-hand side of the sound generator, and having a third transducer (63) and a fourth transducer for a right-hand side of the sound generator, comprising: an interface (10) for receiving a first electrical signal (11) for the left-hand side and a second electrical signal (12) for the right-hand side; and a signal processor for outputting a first output signal for the first transducer on the basis of the first electrical signal and for outputting a third output signal (23) for the third transducer (63) on the basis of the second electrical signal (12), and for calculating a first at least approximate difference between the first electrical signal and the second electrical signal, and a second at least approximate difference between the first electrical signal and the second electrical signal (12), which is different from the first at least approximate difference, and for outputting a second output signal (22) for the second transducer (52) on the basis of the first at least approximate difference, and for outputting a fourth output signal (24) for the fourth transducer (62), which is based on the second at least approximate difference.

Description

Apparatus and method for controlling a synthetically generated sound generator including differential signals

Field of invention

The present invention relates to the field of electroacoustics, and more particularly to concepts for recording and reproducing acoustic signals.

Background of the invention

Typically, acoustic scenes are recorded using a set of microphones. Each microphone outputs a microphone signal. For an orchestral audio scene, for example, 25 microphones can be used. The audio engineer then mixes the 25 microphone output signals into, for example, a standard format such as stereo, 5.1, 7.1, 7.2 or other equivalent formats. In a stereo format, for example, two stereo channels are generated by a sound engineer or an automated mixing program. In the 5.1 format, five channels plus a subwoofer are mixed. Similarly, in the 7.2 format, for example, the mix produces seven channels and two subwoofer channels. To represent the audio scene in a reproduction environment, the mixing results are applied to electrodynamic speakers. In a stereo reproduction (reproduction) scenario, there are two loudspeakers, a first loudspeaker receiving a first stereo channel and a second loudspeaker receiving a second stereo channel. In the 7.2 reproduction format, for example, there are seven speakers at predetermined positions, and in addition, there are two subwoofers that can be placed at relatively arbitrary positions. Seven channels are used for corresponding speakers, and two subwoofer channels are used for corresponding subwoofers.

The use of a single microphone arrangement in detecting audio signals and a single loudspeaker arrangement in reproducing audio signals often ignores the true nature of the sound source. European patent EP 2692154 B1 describes an arrangement for the detection and reproduction of audio scenes, in which not only translations but also rotations and, among other things, vibrations are recorded and reproduced. The audio scene is thus reproduced not only by a single detection signal or a single mixed signal, but also by two detection signals or two mixed signals, which are recorded simultaneously on the one hand and reproduced simultaneously on the other hand signal. In this way, different emission characteristics of the audio scene are recorded compared to standard recording and reproduced in a reproduction environment.

For this purpose, as shown in the European patent, a set of microphones is placed between the acoustic scene and the (virtual) auditorium in order to detect "knowledge" or translational signals, characterized by high directivity or high quality.

Additionally, a second set of microphones is placed above or to the side of the acoustic scene to record low-quality or low-directional signals intended to represent rotation rather than translation of sound waves.

On the reproduction side, corresponding loudspeakers are placed in typical standard positions, each of these loudspeakers exhibiting an omnidirectional configuration in order to reproduce rotational signals, and a directional configuration in order to reproduce "conventional" translational sound signals. Additionally, there is still one subwoofer in each of the standard positions, or just a single subwoofer in any position.

European patent EP 2692144 B1 discloses a loudspeaker for reproducing translational audio signals on the one hand and rotational audio signals on the other hand. The loudspeaker therefore exhibits an omnidirectional emission configuration on the one hand and a directional emission configuration on the other hand.

European patent EP 2692151 B1 discloses an electret microphone that can be used to record omnidirectional or directional signals.

European patent EP 3061262 B1 discloses an earphone and a method of manufacturing an earphone that generates both a translational sound field and a rotational sound field.

European patent application EP 3061266 A1 (which is intended to be granted) discloses an earphone and a method of manufacturing an earphone, which earphone is arranged to generate a "conventional" translational sound signal when using a first converter, and when using a conventional A rotating sound field is produced when the second transducer is arranged perpendicular to the first transducer.

The recording and reproduction of rotating sound fields as well as translating sound fields results in a significantly improved and therefore high-quality perception of the audio signal, which almost gives the effect of a live concert, although the audio signal is reproduced by loudspeakers or headphones or headphones.

This produces a sound experience that is almost indistinguishable from the original sound scene in which the sound is emitted not through speakers but through instruments or voices. This is achieved by considering that sound is emitted not only in translation, but also in rotation and, if necessary, in vibration, and should therefore be recorded and reproduced accordingly.

A disadvantage of the described concept is that the recording of additional signals to reproduce the rotation of the sound field represents an additional workload. Additionally, there are many pieces of music, whether classical or pop, in which only conventionally panning sound fields have been recorded. Such segments are often still heavily compressed in terms of their data rate, such as according to the MP3 standard or the MP4 standard, which results in additional quality degradation that, however, is usually only audible to skilled listeners. On the other hand, there are almost no more audio clips that have not been recorded at least in stereo format, that is, with left and right channels. Developments are even in the direction of producing more channels than the left and right channels, ie thus producing surround recordings with for example five channels or even recordings with higher formats, which in this technical field Known by the keywords MPEG Surround or Dolby Digital.

This means that there are many different clips that have been recorded at least in stereo format, ie with a first channel for the left and a second channel for the right. There are even more and more clips in which have been recorded with more than two channels, for example, for formats where there are several channels on the left and several channels on the right, and one channel in the center. Even higher formats use more than five channels in the plane, and in addition, channels from above or channels from diagonally above, and if possible, channels from below.

However, what all these formats have in common is that they reproduce conventional panning sounds simply by placing individual channels to corresponding speakers with corresponding converters.

Summary of the invention

The object of the present invention is to provide an improved concept for controlling and reproducing audio signals.

This object is achieved by a device for control as claimed in claim 1, a sound generator system as claimed in claim 10, a method of controlling as claimed in claim 15, a method of operating a sound generator system as claimed in claim 16, or as The computer program of request item 17 is implemented.

The invention is based on the knowledge that the synthetic generation of rotational signals is possible if there are audio segments with more than one channel, ie already with two channels, for example stereo channels or even more channels. By calculating at least an approximate difference, according to the method of the invention, an at least approximate value of the differential signal or of the rotational signal is obtained, which approximation can then be used to control an omnidirectional converter or a converter with smaller directional effects, so that in practice only Signals recorded in translation derive a rotational component and reproduce it in the sound field.

In a preferred embodiment, an interface is provided that receives a first electrical signal, such as for the left channel, and a second electrical signal, such as for the right channel. These signals are fed to a signal processor to reproduce a first electrical signal for the first converter and a second electrical signal for the third converter. These converters are conventional converters. Furthermore, the signal processor is configured to calculate at least an approximate difference between the first electrical signal and the second electrical signal and determine from the difference a third electrical signal for the second converter or a third electrical signal for the fourth converter. Fourth electrical signal.

In an embodiment, the signal processor is configured to output a first electrical signal for the first converter and a second electrical signal for the third converter, and calculate a third electrical signal for the first electrical signal and the second electrical signal. an at least approximate difference and calculating a second at least approximate difference between the first electrical signal and the second electrical signal and outputting a third electrical signal for the second converter based on the first at least approximate difference, and based on the second at least approximate difference The difference is approximated to output a fourth electrical signal for the fourth converter. Preferably, the difference is the exact difference in which the second signal is changed by 180° and added to the first signal. If this signal is a first at least approximately difference, then a different second at least approximately difference is the result when the first signal is phase shifted by 180°, ie becomes "negative" and added to the unchanged second signal. Alternatively, a first at least approximate difference is calculated and a phase shift of eg 180° is applied to the first at least approximate difference in order to calculate a second at least approximate difference. Therefore, the second at least approximate difference is then determined directly from the first at least approximate difference. Alternatively, the two differences may be determined independently of each other, in particular from both the original first and second electrical signals, ie the left and right input signals.

The difference is ideally the value obtained when the first channel is subtracted from the second channel, or vice versa. However, at least approximate differences are obtained when the phase shift is not 180° but greater than 90° and less than 270°, and this may be useful in certain embodiments. In an even better range, which is smaller, the phase shift is a phase value between 160° and 200°.

In one embodiment, one of the two signals may also undergo a phase shift equal to or different from 180° before the difference is formed, and may additionally undergo frequency-dependent processing, such as equalizer processing or frequency Selective or non-frequency selective amplification. Additional processing that can be performed before or after difference formation consists of high-pass filtering. If a high-pass filtered signal is combined with another signal, for example, at an angle of 180°, this also represents at least an approximate difference. The difference, which is calculated at least approximately as On the basis of this, signals are generated for excitation of rotational waves in corresponding converters, which are separate from conventional converters. For example, an angle of 180° can be used. The amplitude of the signal can be varied in a frequency-selective or non-frequency-selective manner. Furthermore, the combination of frequency-selective or non-frequency-selective variations in amplitude of the two electrical signals and an angle between 90° and 270° also produces a rotational excitation signal, which in many cases is suitable for a single rotational converter, That is the second converter on the left and the second converter on the right.

In a preferred embodiment of the invention, the converter is controlled within a sound generator, which is assembled as a headphone, or alternatively as an earphone. Also, alternatively, the sound generator is provided by a loudspeaker array, one loudspeaker being provided for the left side with respect to the listener, and another loudspeaker being provided for the right side of the listener. Therefore, a differential signal for one side and a different differential signal for the other side need not necessarily be used to control a head-mounted sound generator, but can also be used for speakers located far away from the listener's head. Each of these speakers will then have at least two converters fed with different signals, where the first speaker for the "left" has a first converter fed with the original left signal or possibly a delayed left signal, and The second converter is fed with a signal derived from the first at least approximately first difference. Therefore, the individual converters of the second loudspeaker are then controlled for use on the "right side".

In another embodiment where there are more than two channels, i.e. for example in the case of a 5.1 signal, the signal processor or interface is previously used for the downmixing of the first electrical signal, i.e. for the left channel. amplifier, and another downmixer for the second electrical signal, namely for the right channel. On the other hand, if the signal is present as a raw microphone signal, such as a stereo surround signal with multiple components, then each downmixer will be configured to calculate the left or right channel accordingly from the stereo surround signal, which It will then be used by the signal processor to calculate the third electrical signal and the fourth electrical signal based on at least the approximate difference.

Detailed description of preferred embodiments

Figure 1 shows a device for controlling a sound generator having a first sound generator element 50 for the left side and a second sound generator element 60 for the right side. Each element of the sound generator includes two transducers. The sound generator may be a head-mounted sound generator, such as headphones or headphones, or may be assembled as a loudspeaker. The sound generator element 50 for the left side includes a first converter 51 and a second converter 52 and the sound generator element for the right side shown at reference 60 includes a third converter 63 and a fourth converter 64 .

The device for controlling the sound generator elements 50, 60 is shown schematically as 1 and is arranged separately from the two sound generator elements 50 and 60, ie in a separate device or integrated in the sound generator element. In individual configurations, the output signals 21, 22, 23, 24 are supplied to corresponding sound generator elements 50, 60, for example wirelessly or wired. In an integrated configuration, the original channels for the left and right sides, namely the first electrical signal 11 and the second electrical signal 12 , are supplied directly to the two loudspeakers, and the means for control are then assembled to calculate the signal for each Corresponding signal to a loudspeaker. When the device 1 is integrated in a loudspeaker or headphones, the sound generator element 50 will only calculate the output signals 21 , 22 , and the device 1 for control will only calculate the right side, i.e. for the sound generator element 60 The output signals 23 and 24 in Figure 1.

The device 1 for controlling a sound generator having sound generator elements includes an interface 10 for receiving a first electrical signal for the left side and a second electrical signal for the right side. Furthermore, the signal processor is configured to output a first output signal based on the first electrical signal for the first converter and to output a second output signal based on the second electrical signal for the third converter. Furthermore, the signal processor 20 is configured to operate using a difference former 25 that calculates a first at least approximate difference between the first electrical signal and the second electrical signal and the first electrical signal and the second electrical signal. A second at least approximate difference between signals, the two at least approximate differences being different from each other. Additionally, the signal processor 20 is configured to determine and output a second output signal 22 based on the first at least approximate difference, and to determine and output a fourth output signal based on the second at least approximate difference for the second sound generation. The output of the fourth converter 64 of the converter element 60.

The signal processor is configured to use the first electrical signal directly as the first output signal or the second electrical signal 12 directly as the second output signal 23 for the third converter. However, as shown in Figure 2, it is preferred to provide a delay element 26 for generating the first output signal 21 and a delay element 27 for generating the third output signal 23, in order to control the respective two loudspeakers of Figure 1 or The headsets/earphones 50 and 60 are known as converters 51 and 63 respectively.

The signal processor 20 further includes a difference former 25 to calculate a first at least approximate difference (eg, L-R) and to calculate a second at least approximate difference (eg, R-L) that is different from the first difference. In a preferred embodiment, two at least approximate differences are supplied to high-pass filter (HP) and equalizer elements (EQU) 28 and 29 respectively, and in some embodiments, the output signals of these elements 28, 29 are still amplified, respectively, as represented by amplifiers 30 and 31 , to calculate, respectively, the second converter 52 and the fourth converter 64 of FIG. 1 based on at least approximate differences (e.g., L-R) and (e.g., R-L). The second output signal 22 and the fourth output signal 24.

In an alternative embodiment, corresponding high-pass filter/equalizer measurements 28, 29 may also be used before the difference is formed. Also, alternatively, the amplification by the amplification elements 30, 31 can also be performed before the difference formation or before the high-pass filter/equalizer measurement 28 or 29.

In a preferred embodiment, the elements 28, 29 and/or 30, 31 are configured to be controllable in order to process the two differential signals accordingly, in particular based on a calibration procedure that determines from a psychoacoustic perspective What is the sound effect when the learned signal and the newly determined differential signal are perceived together. Preferably, the calibration is performed by means of so-called pink noise, since it has been found that in this way the best and most reliable adjustment results for the adjustable elements 28, 29, 30 and 31 are achieved. Depending on the implementation, the elements may be controllable depending on whether a pair of headphones, a pair of headphones or a pair of speakers are connected on the output side. In embodiments, the components may also be controllable to obtain appropriate settings for the newly formed differential signal, eg for generating rotational waves, depending on the particular type of music content.

Figure 3a shows a preferred embodiment for forming differences. The first difference forming element 25a forms a difference (L-R), and the second difference forming element 25b forms a difference (R-L). Here, in element 25a, the polarity of the right signal R is inverted, i.e. a phase shift of 180° is applied, while in element 25b, the polarity of the left signal is inverted and then added to the right signal, this inversion also means It is said that a phase shift of 180° is applied.

In the embodiment shown in Figure 3b, only one addition is calculated. For this purpose, the difference between the left signal and the right signal is calculated by element 25a and output as at least approximately the difference (L-R). This value preferably has a phase shift of 180° in the phase shifting element 25c in order to calculate at least a second approximate difference (R-L) different from the first at least approximate difference. It is also possible to use phase shift values between 90° and 270° for the addition in element 25a and for element 25c respectively, but preferably phase values between 160° and 200° are used, and optimally The value of ground between 175° and 185°, i.e. essentially 180°, as shown in Figure 3d. As an alternative to the pole inversion in Figures 3a, 3b, a simple adder 25f can therefore be used, as shown in Figure 3d, in combination with the first phase shifter 25d and the second phase shifter 25e, with the pole inversion in Shown in Figure 3d are Φ1 and Φ2. Depending on the embodiment, the phase shifter 25 d can also be located in the first branch, ie for the first electrical signal 11 , and not necessarily in the signal branch for the second electrical signal 12 on the right.

Figure 3c shows another alternative embodiment, where the input signal is not a stereo signal, but a multi-channel signal in, for example, a 5-channel format, such as a 5.0, 5.1, 5.2 format. Here, there are rear left channel (LS), front left channel (LF), front right channel (RF), rear right channel (RS), and center channel (C). The first downmixer 13 is configured to add at least LF and LS and possibly C respectively to each other according to some kind of weighting to determine the first electrical signal 11 input to the signal processor 20 . The second downmixer 14 is then preferably configured to sum only the upper right channels, ie RF, RS, and the center channel, preferably weighted by a factor of 0.5, to obtain the feed to the signal processing The second electrical signal in the device 20. As in one of the embodiments shown in Figures 1 to 3b, 3d, the signal processor 25 is in turn configured to process the first output signal 21, 52, 63, 64 for the converters 51, 52, 63, 64. The second output signal 22 , the third output signal 23 and the fourth output signal 24 .

Alternatively, the downmixer 13 or the downmixer 14 is configured to consist of a microphone signal from a real or virtual microphone, respectively, or generally a stereo surround sound signal, which may be available in B-format, for example, and which may, for example, have a full For the directional component and two or three directional components, the left signal 11 or the right signal 12 is calculated.

Such calculations can be performed, for example, when using the translation concept. Determine translation weights from microphone or stereo surround signals or from correlated metadata. To determine these translation weights, the position of the sound source in the microphone signal is determined relative to the microphone position. Then, the sound source in the common mode signal is "placed" via a preferably vector-based amplitude translation when using the position of the loudspeaker or loudspeakers in the reproduction space and when using the (virtual) position of the microphone in the reproduction space. ” somewhere within the representational space. This is done by applying weighting factors to the signal associated with the sound source to obtain a corresponding signal. Sound sources to be placed between the left and center are mapped so that the translation factor for the omnidirectional signal is equal to 0.5 for the left speaker and also equal to 0.5 for the right speaker. When the next two loudspeaker signals are subsequently converted, the sound source will appear, so to speak, as a "phantom source" between the left and center. For other sound sources in the signal, follow the same procedure.

Separating a microphone or stereo surround signal into individual sound sources can be performed by any source separation algorithm. A preferred embodiment consists in subjecting the signal to a time-frequency transformation, wherein a plurality of sub-bands are generated respectively for successive frame sequences, and wherein the direction from which the sound in the microphone signal comes is then determined based on each time-frequency interval of the frame sequence. This direction determination can be accomplished by simply reading the provided metadata that specifies the direction of arrival (DOA) in azimuth and elevation per time/frequency interval. Additionally, depending on the implementation, in addition to DOA information per time-frequency bin, dispersion information may also be provided, as is known from audio signal processing in the field known as Directional Audio Coding (DirAC) A known.

On the other hand, if such metadata is not available but is a complete B-format signal, then this directional information can be determined per time/frequency bin (i.e. per sub-band in each frame) using signal analysis, e.g. Described in the following publication: Publication "Parametric Spatial Audio Effects", A.Politis et al., 15th Int.Conference on Digital Audio Effects (DAFx-12) ), mid-September 17, 2012, or public case "Directional audio coding-perception-based reproduction of spatial sound (Directional audio coding-perception-based reproduction of spatial sound)", V. Pulkki et al., Principles of Spatial Hearing International Workshop on the Principles and Applications of Spatial Hearing, IWPASH, November 11, 2009, Japan.

The present invention is therefore generally equipped for use in any multi-channel or spatial audio application, also including any microphone signal, to always calculate at least one left signal and one right signal, and to calculate the corresponding differential signal from the left signal and the right signal, which Differential signals are preferably used to control rotary converters. The headphone application can be seen in US 2016/0241962 A1, in which the first converter 51 and the third converter 63 are respectively configured in the headphone shell, schematically shown by 50 in Figure 4, which is applied to the ear. 53, and wherein furthermore a second converter 52 and a fourth converter 64 are shown respectively. The converters 52 and 64 are controlled by the second output signal 22 and the fourth output signal 24 respectively, and the first converter will be controlled by the first output signal 21 or the third output signal 23 respectively.

Alternative embodiments of headphones or in-ear devices are preferably designed as so-called balanced armature converters, MEMS converters (MEMS = microelectromechanical systems), dynamic converters or bending wave converters or manager converters or similar elements . Especially in headphone applications, each signal must have its own converter, each with its own generated sound output. This ensures that, within the enclosed sound space created inside the ear by headphones or headphones, considerable bass is obtained even for smaller transducer geometries due to the close arrangement of the transducer to the ear.

Figure 5 shows a preferred embodiment of the present invention in a mobile phone 2. Specifically, the control device 1 is loaded on the mobile phone, for example, as a hardware component or as an application or as a program. The mobile phone is configured to receive a first electrical signal 11 or a second electrical signal 12 or a multi-channel or microphone signal from any source that may be local or found on the Internet, and depending thereon generate output signals 21, 22, 23, 24 or "1, 2, 3, 4". These signals are transmitted to the sound generator with the sound generator elements 50, 60 in a wired or wireless manner, for example by means of a Bluetooth or WLAN mobile phone. In the latter case, it is necessary for the sound generator elements 50, 60 to have a battery power supply, or more generally a power supply, in order to achieve a corresponding amplification of the received wireless signal, for example according to the Bluetooth format or according to the WLAN format.

Even if some aspects have been described in the context of a device, it should be understood that these aspects also represent descriptions of the corresponding methods, such that blocks or structural components of the device are also understood to correspond to method steps or features of method steps. Similarly, aspects described in conjunction with or as method steps also represent descriptions of corresponding blocks or details that correspond to features of the apparatus. For example, some or all of the method steps may be performed by (or when using a hardware device) 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 a device.

Depending on the specific implementation requirements, embodiments of the present invention may be implemented in hardware or software. Embodiments may be performed using digital storage media, such as floppy disks, DVDs, Blu-ray Discs, CDs, ROMs, PROMs, EPROMs, EEPROMs or flash memory, hard disks, or any other magnetic storage device that stores electronically readable control signals. or optical memory, which may cooperate with or with programmable computer systems to enable execution of respective methods. This is why digital storage media can be read by computers.

Some embodiments of the invention thus comprise a data carrier containing electronically readable control signals capable of cooperating with a programmable computer system such that any of the methods described herein are performed.

Generally speaking, embodiments of the invention may be implemented as a computer program product having program code that is operative to perform any of the methods when the computer program product is run on a computer.

For example, the program code can also be stored on a machine-readable carrier.

Other embodiments include a computer program for performing any of the methods described herein, the computer program being stored on a machine-readable carrier.

In other words, therefore, an embodiment of the inventive method is a computer program having program code for performing any of the methods described herein when the computer program is run on a computer.

Therefore, another embodiment of the method of the invention is a data carrier (or digital storage medium or computer readable medium) having recorded thereon a computer program for performing any of the methods described herein.

Accordingly, another embodiment of the methods of the invention is a data stream or a sequence of signals representing a computer program for performing any of the methods described herein. The data stream or sequence of signals may, for example, be configured to be transmitted over a data communications link (eg, over the Internet).

Another embodiment includes processing means, such as a computer or programmable logic device, configured or adapted to perform any of the methods described herein.

Another embodiment includes a computer having installed thereon a computer program for performing any of the methods described herein.

Another embodiment in accordance with the invention includes a device or system configured to transmit to a receiver a computer program for performing at least one of the methods described herein. For example, transmission may be electronic or optical. For example, the receiver may be a computer, mobile device, memory device or similar device. For example, a device or system may include a file server for transmitting computer programs to receivers.

In some embodiments, programmable logic devices (eg, field programmable gate arrays, FPGAs) may be used to perform some or all of the functionality of the methods described herein. In some embodiments, a field programmable gate array can cooperate with a microprocessor to perform any of the methods described herein. Generally speaking, in some embodiments, the methods are performed by any hardware device. The hardware device may be any generally applicable hardware, such as a computer processor (CPU), or hardware specific to the method, such as an ASIC.

The embodiments described above merely represent illustrations of the principles of the invention. It is understood that any modifications and variations in the configurations and details described herein will be appreciated by others skilled in the art. This is because it is intended that the present invention be limited only by the scope of the following claims and not by the specific details presented herein by means of the description and discussion of the embodiments.

1:Device/control device

2,3,4:Output signal

10:Interface

11: First electrical signal/left signal

12: Second electrical signal/right signal

13: First downmixer/downmixer

14: Second downmixer/downmixer

20:Signal processor

21: Output signal/first output signal

22: Output signal/second output signal

23: Output signal/third output signal

24: Output signal/fourth output signal

25:Difference former

25a: First component/component

25b: Second poor forming element/element

25c: Phase shifting components/components

25d: First phase shifter/phase shifter

25e: Second phase shifter

25f: Adder

26,27: Delay element

28,29: High-pass filter and equalizer components/components/adjustable components/high-pass filter/equalizer measurement

30,31: Amplifier/component/amplifying component/adjustable component

50: First sound generator component/sound generator component/headphones/earphones

51: First converter/conventional converter/converter

52: Second converter/converter

53:Ears

60: Second sound generator element/sound generator element/headphones/earphones

63: Third converter/conventional converter/converter

64: Fourth converter/converter

C: Center channel

LF: front left channel

LS: left rear channel

L-R: First least approximate difference/at least approximate difference/difference/approximate difference

R-L: second least approximate difference/at least approximate difference/difference/at least second approximate difference

R: right signal

L: left signal

RF: Front right channel

RS: rear right channel

Φ1, Φ2: pole reversal

Preferred embodiments of the present invention will be explained in detail below with reference to the accompanying drawings. Figure 1 shows a device for control and an associated sound generator according to a first embodiment of the present invention; Figure 2 shows a preferred embodiment of the signal processor of Figure 1; Figure 3a shows the first embodiment of the difference former of Figure 2; Figure 3b shows the second embodiment of the difference former of Figure 2; Figure 3c shows an embodiment for calculating first and second electrical signals from multi-channel or microphone signals; Figure 3d shows another embodiment of the difference former of Figure 2; Figure 4 shows a schematic representation of loudspeakers each with two different converters; and Figure 5 shows an implementation of a device for control in a mobile phone.

1:Device/control device

2,3,4:Output signal

10:Interface

11: First electrical signal/left signal

12: Second electrical signal/right signal

20:Signal processor

21: Output signal/first output signal

22: Output signal/second output signal

23: Output signal/third output signal

24: Output signal/fourth output signal

25:Difference former

50: First sound generator component/sound generator component/headphones/earphones

51: First converter/conventional converter/converter

52: Second converter/converter

60: Second sound generator element/sound generator element/headphones/earphones

63: Third converter/conventional converter/converter

64: Fourth converter/converter

R: right signal

L: left signal

Claims (15)

A device (1) for controlling a sound generator having a first converter (51) and a second converter (52) for one left side of the sound generator and having A third converter (63) and a fourth converter (64) on the right side of the sound generator. The device includes: an interface (10) for receiving a first electrical signal (10) for the left side. 11) and a second electrical signal (12) for the right side; and a signal processor, wherein: the signal processor is used to output based on the first electrical signal (11) for the first converter A first output signal (21) of (51) is used to output a third output signal (23) for the third converter (63) based on the second electrical signal (12), and the The signal processor is configured to calculate a first at least approximate difference between the first electrical signal (11) and the second electrical signal (12) and a first approximate difference between the first electrical signal (11) and the second electrical signal. A second at least approximate difference between (12), the second at least approximate difference is different from the first at least approximate difference, and the signal processor is configured to output for the second based on the first at least approximate difference. A second output signal (22) of the converter (52) is used to output a fourth output signal (24) for the fourth converter (62), the fourth output signal is based on the second at least approximately the difference, wherein the signal processor (20) is configured to determine the second output signal (22) based on the first at least approximate difference using a first adjustable equalizer (28), and The fourth output signal (24) is determined based on the second at least approximate difference using a second adjustable equalizer (29), or wherein a first downmixer (13) is provided for generating the third an electrical signal, and a second downmixer (14) is provided for generating the second electrical signal (12), the first downmixer (13) being configured to receive a multi-channel format left channels to generate the first electrical signal (11) only from the left channels, or wherein the downmixer (14) for the second electrical signal (12) is configured to receive a right channels of a multi-channel format to generate the second electrical signal (12) from the right channels only, or wherein, for The first downmixer (13) of the first electrical signal (11) is configured to calculate the first electrical signal (11) based on a microphone signal representation and for the second electrical signal (12) A second downmixer (14) is configured to calculate the second electrical signal (12) based on the microphone signal representation. The device of claim 1, wherein the signal processor (20) is configured to output the second output signal (22) based on the first at least approximate difference, and to output the second output signal (22) based on the second at least approximate difference. The fourth output signal (24), wherein the second at least approximate difference corresponds to a first at least approximate difference in altered phase. The device of claim 1, wherein the signal processor (20) is configured to obtain the first at least one electrical signal (12) by subtracting (25a) the second electrical signal (12) from the first electrical signal (11). approximate difference, and the second output signal (22) can be obtained based on the first at least approximate difference, and can be obtained by subtracting (25b) the first electrical signal (11) from the second electrical signal (12) or inversely The first at least approximate difference is rotated (25c) to obtain the second at least approximate difference, and the fourth output signal can be output based on the second at least approximate difference (24). The device of claim 1, wherein the signal processor (20) is configured to delay (26, 27) the first electrical signal (11) and the second electrical signal (12) to at least partially compensate A delay due to the signal processor (20) for calculating the second output signal (22) or the fourth output signal (24). The device of claim 1, wherein the signal processor (20) is configured to adjust (30, 31) one of the levels of the second output signal (22) or the fourth output signal (24), such that An adjusted level of the second output signal (22) or the fourth output signal (24) is smaller than a smaller level of the first output signal (21) or the third output signal (23). The device of claim 1, wherein the signal processor (20) is configured to filter the first at least approximate difference by a high-pass filter (28, 29) for generating the second output signal (22 ) or filtering the second at least approximate difference for generating the fourth output signal (24), the high-pass filter having a cutoff frequency between 100 Hz and 500 Hz Rate. The device of claim 1, wherein the signal processor (20) is configured to communicate the output signals (21, 22, 23, 24) via a wireless interface to the device configured separately from the device. sound generator, or provide the output signals (21, 22, 23, 24) in a line conduction manner to a first sound generator element (50) for the left side and a first sound generator element (50) for the right side. Two sound generator elements (60) of the sound generator. A sound generator system, which includes the following features: a first sound generator component (50), which includes a first converter (51) and a second converter (52); a second sound generator component (50) 60), which includes a third converter (63) and a fourth converter (64); and a device for control as in claim 1. The sound generator system of claim 8 is wearable on a head and configured as a headset or a non-headset. The sound generator system of claim 8, wherein the first converter (51), the second converter (52), the third converter (53) and the fourth converter (54) are assembled It is one of a converter group that includes an electromagnetic converter, an electric converter, an isodynamic converter, a quadrature power converter, a static magnet converter, and a balanced armature type transducer, an electrostatic transducer, a piezoelectric transducer, a manager transducer, and a bending wave transducer with a diaphragm, and wherein the first transducer (51) is different from the second transducer converter (52), and wherein the third converter (63) is different from the fourth converter (64). A mobile device (2), which includes: a device for control as in claim 1; and a wireless communication interface for outputting the first output signal (21), the second output signal (22), the The third output signal (23) and the fourth output signal (24). The mobile device (2) of claim 11 is configured separately from the sound generator and configured to communicate with the sound generator via a wireless communication format. A method of controlling a sound generator, which includes a first converter (51) and a second converter (52) for one left side of the sound generator, and a second converter for the sound generator. A third converter (63) and a fourth converter (64) on the right side, the method comprising: receiving a first electrical signal (11) for the left side and a second electrical signal for the right side (12); outputting a first output signal (21) for the first converter (51) based on the first electrical signal (11); outputting a first output signal (21) for the first converter (51) based on the second electrical signal (12); A third output signal (23) of the three converters (63); calculating a first at least approximate difference between the first electrical signal (11) and the second electrical signal (12); calculating the first electrical signal A second at least approximate difference between (11) and the second electrical signal (12), the second at least approximate difference being different from the first at least approximate difference; output for the third based on the first at least approximate difference a second output signal (22) of the second converter (52); and outputting a fourth output signal (24) for the fourth converter (62), the fourth output signal being based on the second at least approximately difference, wherein the second output signal (22) is determined based on the first at least approximate difference using a first adjustable equalization (28), and wherein the fourth output signal (24) is based on the first The two are at least approximately determined using a second adjustable equalization (29), or wherein the first electrical signal is generated by receiving and generating only the left channels of a multi-channel format The first electrical signal (11) is generated, or wherein the second electrical signal (12) is generated by receiving a plurality of right channels of a multi-channel format and generating the second electrical signal from the right channels only. No. (12) is generated, or wherein the first electrical signal (11) and the second electrical signal (12) are each calculated based on a microphone signal representation. A method of operating a sound generator system comprising a sound generator, a first converter (51) and a second converter (52) for one left side of the sound generator, and Comprising a third converter (63) and a fourth converter (64) for one right side of the sound generator, and comprising a device (1) for controlling the sound generator, the method includes: The device (1) calculates a first at least approximate difference between a first electrical signal (11) and a second electrical signal (12); the device (1) calculates a first electrical signal (11) a second at least approximate difference from the second electrical signal (12), the second at least approximate difference being different from the first at least approximate difference; based on the first electrical signal (11) to be used for the first A first output signal (21) of the converter (51) is transmitted from the device (1) to the first converter (51); based on the second electrical signal (12) it is used for the third converter ( A third output signal (23) of 63) is transmitted from the device (1) to the third converter (63); based on the first at least approximate difference, a first signal for the second converter (52) is Two output signals (22) are transmitted from the device (1) to the second converter (52); and a fourth output signal (24) for the fourth converter (62) is transmitted from the device (1) Transmitted to the fourth converter (63), the fourth output signal is based on the second at least approximate difference, wherein the second output signal (22) is based on the first at least approximate difference using a first adjustable equalization (28), and wherein the fourth output signal (24) is determined using a second adjustable equalization (29) based on the second at least approximate difference, or wherein the first electrical signal is generated by receiving a plurality of left channels of a multi-channel format and generating the first electrical signal (11) from the left channels only, or wherein the second electrical signal (12) is generated by receiving a plurality of left channels. channel format and generate the second electrical signal only from the right channels No. (12) is generated, or wherein the first electrical signal (11) and the second electrical signal (12) are each calculated based on a microphone signal representation. A computer program comprising a code for performing the method of claim 13 or 14 when the computer program is run on a computer or a processor.

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