EP4278616A1 - Vorrichtung und verfahren zur wiedergabe mindestens eines akustischen signals - Google Patents
Vorrichtung und verfahren zur wiedergabe mindestens eines akustischen signalsInfo
- Publication number
- EP4278616A1 EP4278616A1 EP22701902.3A EP22701902A EP4278616A1 EP 4278616 A1 EP4278616 A1 EP 4278616A1 EP 22701902 A EP22701902 A EP 22701902A EP 4278616 A1 EP4278616 A1 EP 4278616A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- optical
- acoustic
- laser element
- target medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/004—Transducers other than those covered by groups H04R9/00 - H04R21/00 using ionised gas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
Definitions
- the invention relates to a device and method for reproducing at least one acoustic signal and their use.
- Moving-coil devices which are typically large and heavy and therefore represent physical objects of considerable size, fixed geometry and spatial location. They can only reproduce the sound at their place because they cannot transmit and reproduce the sound over long distances.
- Loudspeakers have a low efficiency in converting electrical power into acoustic power, so amplification of electronic audio signals requires a constant local connection to a power supply, while they also have a limited reproduction range of audio signal frequencies. In addition, special wired or wireless connections are required to transfer the audio signals to the amplifier.
- the acoustic radiation of the loudspeaker in three-dimensional space is also predetermined and cannot match the radiation properties of real sound sources. Therefore, the reproduction of complex acoustic scenes, involving one or more real acoustic sources radiating sound in typical environments, can only be approximated over a limited reception area by the combined acoustic radiation of a multitude of spatially distributed loudspeakers placed at fixed positions around the desired receiving position are placed around.
- Voltage-controlled plasma speakers based on corona and arc effects, produce sound waves through a localized air plasma, but share limitations similar to the electromechanical and piezoelectric speakers.
- the plasma generation here usually takes place between a cathode and an anode and the location of the sound generation remains local, while its reproducibility in the lower, middle and low frequency range is clearly impaired.
- Encoding and transmission of sound information by means of laser radiation is known from telecommunications, but here too the acoustic signals are reproduced via electromechanical converters. Correspondingly, a transmission of acoustic signals to distant listeners is not possible.
- 137 (6), 2015, 389-395 each describe a device and method for generating acoustic signals, a laser-induced plasma (LIB) being generated by means of a pulsed laser signal having a repetition rate of 2 Hz or 20-100 Hz is used as a point source for the most accurate impulse resonance studies possible.
- LIB laser-induced plasma
- a powerful neodymium yttrium aluminum garnet pulsed laser is used to achieve breakthroughs in acoustic fields.
- the plasma formation can be realized by laser-induced breakdown when the local intensity of the laser beam 10 reaches 15 W/m 2 .
- the shock wave created by consuming part of the plasma energy becomes a source of sound.
- the laser beam is focused onto a small volume by a convex lens and the sound source is non-directional due to the laser-induced breakthrough, a point source is generated.
- no device for acoustic excitation is installed in acoustic fields.
- the object of the present invention is to provide a device and method for reproducing at least one acoustic signal and its use, which at least partially overcome the disadvantages and limitations of the prior art mentioned.
- the device and the method should enable the reproduction of acoustic signals, in particular of words, music or usage noises, from analog or digital signal sources at a largely freely selectable location, in particular at a distance from the signal source with broadband spectral properties, without requiring a receiving or Decoding facility or local power supply are required.
- the present invention relates to a device for reproducing at least one acoustic signal.
- the device includes:
- At least one laser element that is set up to emit at least one optical signal to at least one target medium in such a way that the at least one optical signal is transmitted to the at least one target medium and at least one acoustic signal is reproduced by means of the at least one target medium, wherein the at least one target medium is set up to convert the at least one optical signal into the at least one acoustic signal;
- At least one control interface which is set up to consist of at least one electronic signal to be transmitted with the at least one and acoustic signal to be reproduced is correlated to provide at least one control signal to the at least one laser element for controlling the radiation from the at least one optical signal.
- the device proposed here for the reproduction of at least one acoustic signal can be regarded in particular as an "acoustic converter", at the input of which there is an electronic signal which carries at least one piece of information of an original acoustic signal intended for transmission and reproduction, and at the output of which at least one optical signal is emitted, which is converted again, preferably in an unchanged form, into the at least one original acoustic signal by means of a target medium acted upon by the at least one optical signal.
- the at least one acoustic signal reproduced in this way thus includes the information of the at least one original acoustic signal.
- acoustic signal here refers to information carried by sound waves, with the information being modulated into the sound wave.
- the information can in particular be at least one acoustic element, preferably selected from a word, music or a used noise.
- word refers to information carried by sound waves that can be interpreted by a human listener as speech information
- music refers to an organized sound, preferably via instruments or the human voice, in particular for artistic purposes.
- usage noise relates to at least one acoustic signal that is not necessarily of interest to a human listener with regard to the information transmitted thereby, but is suitable for at least one application, in particular selected from medicine, bioengineering, industry and/or or research.
- Sound waves which have a frequency of 16 Hz to 20 kHz and which are also referred to as “auditory sound” as sound that can be heard by humans are particularly suitable for the present invention.
- the present invention is also suitable for sound waves which have a frequency of more than 20 kHz to 1.6 GHz (ultrasound) and which can be used, in particular, in an ultrasonic generator. Sound waves having a frequency below 16 Hz (infrasonic) or above 1.6 GHz (hypersonic) are less suitable for the present invention.
- the proposed device comprises at least one laser element, preferably a single laser element or a plurality of laser elements, in particular in the form of a matrix-like arrangement, the at least one laser element for emission at least one optical signal to at least one target medium.
- optical signal here refers to information carried by electromagnetic waves in the optical spectral range or in an adjacent spectral range, with the information being modulated into the electromagnetic wave.
- the electromagnetic waves used for the optical signal preferably have a frequency of 10 13 Hz to 10 16 Hz, particularly preferably 10 14 Hz to 10 15 Hz.
- laser element refers to an optical element that is set up to generate coherent electromagnetic waves with at least one of these frequencies, in particular by providing short or ultra-short laser pulses to generate a breakdown and/or an ablation in the at least one target medium.
- the at least one laser element can preferably be selected from a solid-state laser, in particular an Nd:YAG laser or a Ti:sapphire laser; a powerful laser diode; or a gas laser or may be based on an optical parametric amplification process, in particular an optical parametric amplifier (OPA) or a chirped pulsed optical parametric amplifier (OPCPA); however, other types of laser elements are possible.
- a solid-state laser in particular an Nd:YAG laser or a Ti:sapphire laser
- a powerful laser diode or a gas laser
- OPA optical parametric amplifier
- OPCPA chirped pulsed optical parametric amplifier
- the at least one optical signal is emitted to at least one target medium.
- target medium refers here to at least one solid substance, in particular a solid body; a fluid, ie a liquid and/or gaseous, substance, or a mixture thereof, eg a natural or artificial atmosphere at least partially surrounding the device; into which the at least one optical signal from the at least one laser element is radiated.
- the at least one target medium into which the at least one optical signal is irradiated and its spatial arrangement in the three-dimensional space are selected in such a way that the at least one optical signal is transmitted to the at least one target medium and the at least one acoustic signal is reproduced Signal takes place by means of at least one target medium.
- transmission refers to a transport of a signal, here the at least one optical signal, preferably in unchanged form, from a first location in a three-dimensional space, here from an output of the at least one laser element, to a different further location in the same three-dimensional space in which at least part of the at least one target medium is located here.
- playback refers to the provision of a signal, here the at least one acoustic signal, preferably in an unmodified form the other location in the same three-dimensional space at which at least part of the at least one target medium is located here.
- the at least one target medium is set up according to the invention for converting the at least one optical signal into the at least one acoustic signal, the provision of the at least an acoustic signal.
- at least one plasma source in the form of a stationary or moving massless laser-induced plasma (LIB) can form in the at least one target medium.
- LIB laser-induced plasma
- LIB refers to a plasma that occurs as a result of at least one target medium being impinged on by at least one optical signal, preferably a sequence of optical signals generated by at least one laser element at a location in the three-dimensional space, the desired conversion of the at least one optical signal into the at least one acoustic signal taking place at the same time at the location.
- the at least one target medium can be a solid body, for example in the form of a plate, which in particular can have at least one metal, ceramic or polymer which, when acted upon by the at least one , From the at least one laser element radiated optical signal allows direct playback of the acoustic signal.
- At least one fluid i.e. at least one gas present in an atmosphere, preferably a natural atmosphere, is therefore particularly preferred; at least one liquid; or a mixture thereof, in which the plasma source can form at a largely freely selectable location.
- the at least one target media may preferably comprise at least one gas or gas mixture under controlled pressure conditions in order to increase transmission and playback efficiency.
- the proposed device also includes at least one control interface, preferably precisely one control interface part e, which is set up to transmit at least one control signal from at least one electronic signal, which is correlated with the at least one acoustic signal to be transmitted and reproduced, to the at least one laser element for control to provide the emission of the at least one optical signal.
- the term “electronic signal” here refers to information carried by electromagnetic waves, the information being impressed into the electromagnetic wave by a modulation, e.g. B. by changing a electrical voltage or an electrical current, or by means of a wired or wireless information signal.
- the electromagnetic waves used for the at least one electronic signal have a frequency of 1 Hz to 5 MHz, preferably 10 Hz to 500 kHz.
- the electromagnetic waves used according to the present invention for the at least one electronic signal are correlated with at least one acoustic signal to be transmitted and reproduced.
- the term “correlated” denotes a possibility of converting an acoustic signal, preferably in an unchanged form, into an electronic signal in such a way that the acoustic signal, preferably in an unchanged form, can be generated again from the electronic signal.
- the term “coded” can also be used here with the same meaning.
- the at least one piece of information imprinted in the electromagnetic wave can be, in particular, a word, music or a functional noise that corresponds to the information carried by the at least one acoustic signal. Therefore, the present at least one electronic signal can also be referred to as an “audio signal”.
- control interface refers to an electronic device that is set up to generate at least one control signal, with the at least one control signal being designed to control at least one other device.
- control signal refers here to a signal, preferably an electronic signal or an optical signal, which includes information that is set up to change at least one state of the further device to be controlled in such a way that the further device performs a desired action .
- the at least one control interface can be set up to generate the at least one control signal, which is transmitted to the at least one laser element and is thus used to control the emission of the at least one optical signal from the at least one laser element.
- the at least one original audio signal which can be either analog or digital, can be converted into the at least one control signal, in particular at least one first control signal for controlling the at least one laser element, which can therefore also be referred to as a "trigger signal", and, as explained in more detail below, optionally at least one second control signal for controlling an optical modulation unit.
- the control signal can in this case be designed as a stream of rectangular electrical pulses, with an electrical pulse emission of a cause an individual laser pulse or cause a modulation of the optical signal emitted by the at least one laser element.
- the proposed device can also include at least one signal modulator, preferably exactly one signal modulator, which is used to receive at least one electronic signal that is correlated with at least one acoustic signal to be transmitted and reproduced, and to generate at least one modulated electronic signal is set up.
- the terms “modulate” or “modulation” refer to a superposition of a carrier signal, here the at least one electronic signal, with at least one piece of additional information in order in this way to encode the carrier signal with the additional information.
- the at least one piece of additional information can be impressed into the carrier signal, here into the at least one electronic signal, by means of a selected method.
- Pulse width modulation refers to a procedure in which the duty cycle of a repeated pulse, e.g. a square-wave pulse, is changed in accordance with the information to be encoded, with the frequency of the carrier signal remaining unchanged.
- Pulse amplitude modulation refers to a discrete-time, analogue or digital modulation technique in which information is encoded as changes in the amplitude of the pulses in a stream of pulses.
- a "1-bit ZA modulation” refers to a pulsed digital modulation method that encodes information to be encoded in the changes in the pulse-to-pulse time interval of consecutive pulses
- a "multi-bit ZA modulation” refers to a pulsed digital modulation method that to coding information is encoded both in the changes in the pulse-to-pulse time spacing of successive pulses and in the amplitude of the pulses.
- Mixed methods which can occur as a combination of PWM, PAM and EA modulation methods, are also suitable for the present invention.
- the generation of the at least one modulated electronic signal can be dispensed with; however, this cannot apply to other modulation methods, in particular to ZA modulation methods or mixed modulation methods.
- a signal can preprocess and code random complex acoustic signals in order to reproduce them by means of the at least one laser element via at least one optical pulse stream.
- a real-time modulation of the pulse energy and a pulse-to-pulse repetition rate can thereby be made possible, as a result of which the at least one desired optical pulse stream can be generated.
- the signal pre-processing can advantageously also be used to reduce or, preferably, to eliminate distortions that can occur when the optical signal is transmitted to the target medium or when the optical signal reacts with the target medium.
- the proposed device can preferably further comprise at least one optical modulation unit, which is set up for optical modulation of the optical signal emitted by the at least one laser element before the at least one target medium is impinged with the at least one optical signal, the at least one optical Modulation unit can be controlled by means of a further control signal provided by the control interface.
- the at least one optical modulation unit can preferably be set up for the optical modulation of an amplitude of the optical signal emitted by the at least one laser element.
- the at least one optical modulation unit can preferably be selected from an acousto-optical modulator (AOM modulator), in particular a Bragg cell; or an electro-optical modulator, in particular a Pockels cell; however, other types of optical modulation units are conceivable.
- AOM modulator acousto-optical modulator
- the "Bragg cell” here comprises a crystal and a piezoelectric converter, whereby the converter emits a sound wave into the crystal, which generates mechanical stresses. Depending on the intensity of the sound wave, the crystal deflects part of the incident light.
- Pockels cell refers to an electro-optical modulator that has an optically birefringent crystal in which an electric field is generated from the additional control signal applied to the Pockels cell, which can change the size and orientation of the birefringence.
- the device can also include at least one further optical element, which can be designed as an independent optical element and/or can be integrated into the at least one laser element.
- the at least one further optical element can preferably be set up to focus the at least one optical signal emitted by the at least one laser element onto at least one desired location in a three-dimensional space.
- the at least one further optical element can be selected in particular from at least one optical lens, preferably a focusing optical lens, or at least one optical mirror.
- the optical signal generated by the at least one laser element can already have a sufficiently high focus and can already be emitted in the desired direction in the three-dimensional space. Regardless of the way in which the at least one optical signal is focused, it can thus be ensured that the at least one acoustic signal can be generated at the at least one desired location in the three-dimensional space.
- the present invention relates to a method for reproducing at least one acoustic signal.
- the method here comprises the following steps a) to c): a) receiving at least one electronic signal which is correlated with at least one acoustic signal to be transmitted and reproduced; b) providing at least one control signal to at least one laser element for controlling an emission of at least one optical signal using the at least one electronic signal which is correlated with the at least one acoustic signal to be transmitted and reproduced; and c) Emitting the at least one optical signal by the at least one laser element to at least one target medium in such a way that the at least one optical signal is transmitted to the at least one target medium and the at least one acoustic signal is reproduced by means of the at least one target medium, wherein the at least one target medium performs a conversion of the at least one optical signal into the at least one acoustic signal.
- Steps a) to c) can preferably be carried out several times in the specified order, it being possible to start again with step a) with a further electronic signal before the end of step c).
- steps a) to c) can preferably be carried out repeatedly according to the length of the at least one electronic signal, whereby real-time information transcoding of the at least one electronic signal correlated with the at least one acoustic signal into the at least one optical signal and finally into the according to the invention reproduced at least one acoustic signal is reached.
- At least one modulated electronic signal can be provided from the at least one electronic signal, which is correlated with the at least one acoustic signal to be transmitted and reproduced, with the at least one control signal being sent to the at least one laser element from the at least one modulated electronic signal can be generated.
- the at least one control signal to the at least one laser element can also be generated directly from the at least one electronic signal, which is correlated with the at least one acoustic signal to be transmitted and reproduced.
- At least one further control signal can be provided to at least one optical modulation unit for controlling an optical modulation of the optical signal emitted by the at least one laser element, wherein the optical modulation of the optical signal emitted by the at least one laser element is carried out before the at least one a target medium with the at least one optical signal. It can be particularly preferred here if the optical modulation of the optical signal emitted by the at least one laser element comprises an optical modulation of an amplitude, in particular a pulse amplitude modulation, of the optical signal emitted by the at least one laser element.
- the at least one further control signal to the at least one optical modulation unit can be generated directly from the at least one electronic signal, which is correlated with the at least one acoustic signal to be transmitted and reproduced, or from the at least one modulated electronic signal.
- the at least one optical signal emitted by the at least one laser element can also be focused on at least one desired location in a three-dimensional space.
- the at least one further optical element can be selected in particular from at least one optical lens, preferably a focusing optical lens, or at least one optical mirror, with, alternatively, the optical signal generated by the at least one laser element already being sufficiently focused have and can already be radiated in the desired direction in the three-dimensional space, so as to ensure that the at least one acoustic signal can be generated at the at least one desired location in the three-dimensional space.
- the present invention relates to the use of the device for reproducing at least one acoustic signal.
- a particularly preferred use can relate to using the device as a loudspeaker for reproducing at least one acoustic signal at a desired location in a three-dimensional space, preferably for reproducing high-quality acoustic signals, in particular reproducing high-fidelity audio.
- the acoustic signal here refers to at least one sound wave information that is impressed and carried in this way by the at least one sound wave, which can in particular be at least one acoustic element, preferably selected from a word, music or a functional noise.
- the terms “have”, “have”, “comprise” or “include” or any grammatical variations thereof are used in a non-exclusive manner. Accordingly, these terms can refer both to situations in which, apart from the features introduced by these terms, no further features are present, or to situations in which one or more further features are present.
- the expression “A has B”, “A has B”, “A comprises B”, or “A includes B” can both refer to the situation in which, apart from B, no other element in A is present (ie to a situation in which A consists exclusively of B), as well as to the situation in which, in addition to B, there are one or more other elements in A, e.g. element C, elements C and D or even further elements .
- the terms “at least one” and “one or more” as well as grammatical variations of these terms, if they are used in connection with one or more elements or features and are intended to express that the element or feature is provided once or several times can generally only be used once, for example when the feature or element is introduced for the first time. If the feature or element is subsequently mentioned again, the corresponding term “at least one” or “one or more” is usually no longer used, without thereby limiting the possibility that the feature or element can be provided once or more than once.
- the present method and the device described are particularly suitable for transmitting at least one acoustic signal, which may come from an analogue or a digital signal source, over long distances and for reproducing it directly on a distant target or an airborne location, without the need for a Receiving device and / or a decoding device, in particular in the form of an electromechanical converter, or a local power supply is required.
- the demodulation of the sound signal takes place directly in the surrounding atmosphere and the acoustic signal in the form of simple or complex words, music or operational noise can be perceived by human or animal hearing.
- the desired information and the power signal can be transmitted simultaneously.
- the present invention also enables a real-time displacement of the at least one acoustic signal source in a three-dimensional space by shifting the focal point of a laser element and the provision of at least one acoustic signal source with any directivity, i.e. analogous to real, moving acoustic signal sources.
- This can be achieved by using piezoelectric positioners with fast rotation for the laser, or fast moving mirrors that deflect the beam to the desired position, or by any other method that allows the laser focal point to be rapidly shifted in three-dimensional space.
- any number of such virtual signal sources can potentially be provided at a desired location in the three-dimensional space. This is only approximately possible with the known speaker-based sound reproduction methods.
- the invention also enables generation of controlled, pulse-like acoustic signals with very short propagation times at any pressure, particularly high pressures, which are useful for many acoustic measurements and virtual audio systems.
- the present invention thus enables the remote-controlled provision of basically any acoustic signal source that differs from the traditional wired or wireless audio channel methods.
- no electrical, electronic or optoelectronic components such as cables or glass fibers are required to transmit the coded signals.
- the present invention can further also be used for the reproduction of ultrasonic acoustic signals, which can be generated in solids or fluids, the intensity, position and duration of which can be precisely controlled, particularly for medical or testing applications.
- FIG. 1 shows a schematic representation of the device according to the invention for reproducing at least one acoustic signal
- FIG. 2 shows a schematic representation of a preferred exemplary embodiment of the device according to the invention for reproducing at least one acoustic signal
- FIG. 3 shows a schematic representation of a further preferred exemplary embodiment of the device according to the invention for reproducing at least one acoustic signal
- FIG. 4 shows a schematic representation of the method according to the invention for reproducing at least one acoustic signal.
- Figure 1 shows a schematic representation of a device 110 according to the invention for the reproduction 112 of acoustic signals 114 at a location 116 in a three-dimensional space 118.
- the acoustic signals 114 are information carried by sound waves, which are generated by modulation in the sound wave is imprinted.
- the information can in particular be at least one acoustic element, preferably selected from a word, music or a used noise. Sound waves which have a frequency of 16 Hz to 20 kHz and which are also audible to humans are therefore particularly suitable referred to as "auditory noise".
- the present invention is also suitable for sound waves which have a frequency of more than 20 kHz to 1.6 GHz (ultrasound) and which can be used, in particular in an ultrasonic generator, preferably for at least one of the above-mentioned uses.
- the exemplary embodiment of the device 110 shown schematically in FIG. can be generated again from the electronic signals 122 to be received at a signal input 124 . Therefore, the electronic signals 122 correlated with the acoustic signals 114 can usually also be referred to as “audio signals”.
- the electronic signals are information carried by electromagnetic waves, the information being impressed into the electromagnetic wave by modulation. Electromagnetic waves with a frequency of 1 Hz to 5 MHz, preferably 10 Hz to 500 kHz, are particularly suitable for this purpose.
- the electronic signals 122 received by the signal modulator 126 are modulated by superimposing the electronic signals 122 in order to encode the electronic signals 122 as a carrier signal by means of additional information, the additional information being impressed into the electronic signals 122 acting as the carrier signal using a selected method will.
- known modulation methods can be used here, methods of digital audio modulation, in particular pulse width modulation (PWM), plus amplitude modulation (PAM) or an XA modulation method or being particularly preferred; However, other modulation methods are possible.
- the signal modulator 126 is particularly suitable for some modulation methods, in particular for SA modulation methods, while control signals 130 for other modulation methods, in particular for PWM and PAM, can be obtained directly from the electronic signals 122, which are correlated with the acoustic signals 114 to be transmitted and reproduced. let generate.
- the control interface 120 generates the electronic signals 122 with the signals to be transmitted and reproduced acoustic signals 114 are correlated, the control signals 130, which are provided to the single laser element 132 shown here for controlling an emission 134 of optical signals 136.
- the device 110 can have at least two, in particular three, four, five, six, eight, ten, twelve or more laser elements 132 .
- Each laser element 132 may preferably be a laser diode or a solid state laser; however, other types of laser elements 132 are possible.
- the control interface 120 can be or include an electronic device set up to generate the control signals 130, with the control signals 130 preferably being further electronic signals or optical signals which have information on changing at least one state of the laser element 132 to be controlled thereby. As explained in more detail in FIG. 3, the control interface 120 can preferably transmit one or more further control signals to one or more further units for their control. For further details, reference is made to the description of FIGS. 2 and 3 below.
- the proposed device comprises the one laser element 132 shown here, which is set up to emit 134 the optical signals 136 to a target medium 138 .
- the optical signals 136 are transmitted 140 to the target medium 138 and the acoustic signals 114 are reproduced 112 by means of the target medium 138 , which is set up to convert the optical signals 136 into the acoustic signals 114 .
- a solid substance in particular a solid body, is suitable as the target medium 138; a fluid, i.e. a liquid and/or gaseous, substance; or a mixture of these.
- the target medium 138 into which the optical signals 136 are irradiated and its spatial arrangement are selected according to the invention in such a way that this enables the optical signals 136 to be transported, preferably in an unchanged form, from an optical output 142 of the laser element 132 to the location 116 in the three-dimensional space 118 and the provision of the acoustic signals 114, preferably in an unchanged form, at the location 116 in the three-dimensional space 118. Since the target medium 138 is suitable according to the invention for converting the optical signals 136 into the acoustic signals 114, can thus at the Place 116 in the three-dimensional space 118, where the target medium 138 or a part thereof is located, the reproduction of the acoustic signals 114 take place. For preferred implementation of the target medium 138, reference is made to the exemplary embodiments below.
- Figures 2 and 3 each show a schematic representation of a preferred embodiment of the device 110 according to the invention for the reproduction 112 of the acoustic signals 114 at the desired location 116 in the three-dimensional space 118 located on or in the target medium 138. While FIG. 2 shows an embodiment of the device 110 according to the invention based on a single-bit coding, FIG. 2 shows schematically an embodiment of the device 110 according to the invention based on a multi-bit coding.
- Both the signal modulator 126 used in Figure 2 and the signal modulator 126 used in Figure 3 are each set up to receive the electronic signals 122 referred to as "audio signals", which are correlated with the acoustic signals 114 to be transmitted and reproduced - as described in more detail above .
- the signal modulator 126 used in the embodiment according to FIG e.g. a trigger input of the laser element 132 can be provided.
- the control interface 120 can thus convert the electronic signals 122 referred to as “audio signals”, which the signal modulator 126 provides in the form of analog, modulated electronic signals, preferably as pulse width modulated signals, into a stream of digital modulated electronic signals 128.
- the signal modulator 126 in the embodiment according to Figure 3 can also generate further modulated electronic signals 144 from the received electronic signals 122 referred to as "audio signals", from which the control interface 120 - in a similar manner to the control signals 130 - can generate further control signals 146 for Controlling an optical modulation unit 148, preferably by means of a modulator controller 150.
- the optical modulation unit 148 can preferably be a Bragg cell, which can be acted upon by voltage signals 152 generated by the modulator controller 150 ; however, other types of optical modulation units 148, such as a Pockels cell, are conceivable.
- the optical modulation unit 148 is set up for optical modulation of the optical signals 136 emitted by the laser element 148, in particular the amplitude of the optical signals 136 emitted by the laser element 148, before the optical signals 136 are applied to the target medium 138.
- the control interface 120 which is used in the embodiments according to FIGS. 2 and 3, can preferably be an input/output interface, preferably a commercially available sound card 154 with a wide frequency range, higher sample rate and a sufficient number of output channels to provide the control signals 130,146.
- each optical pulse can generate exactly one acoustic pulse, while the electronic signals 122 referred to as “audio signals” can simulate a sequence of acoustic pulses at the location 116.
- a plate 160 which in particular can have at least one metal, ceramic or polymer, enables a direct reproduction 112 of the acoustic signals 114, with additional harmonic or non-harmonic distortions caused by ablation in A consequence of processing, in particular etching, of a surface of the plate 160 and/or due to vibrations of the plate 160.
- the target medium 138 can also be implemented in another way, in particular in the form of a fluid, preferably a natural or artificial atmosphere surrounding the device.
- the optical modulation unit 148 used in the embodiment according to FIG thus controlling an intensity of the acoustic signals 114 generated therefrom at the location 116, thereby enabling implementation of different levels of the desired multi-bit coding.
- a microphone 162 can be used to verify the generation of the acoustic signals 114 166, which can be supplied to the signal modulator 126, which can generate electronic signals 168 demodulated therefrom by signal modulation, which can be output at a signal output 170 and compared with the electronic signals 122 referred to as “audio signals”.
- Figure 4 shows a schematic representation of a method 210 according to the invention for reproducing 112 at least one acoustic signal 114.
- the electronic signals 122 referred to as "audio signals” are received, which are correlated with the acoustic signals 114 to be transmitted and reproduced.
- the control signals 130 are provided to the laser element 132 to control the emission 134 of the optical signals 136 using the electronic signals 122 received during the reception step 212 in accordance with step a).
- the provision step 214 can be a provision the further control signals 146 to the optical modulation unit 148 likewise using the electronic signals 122 received during the receiving step 212 according to step a).
- the optical signals 136 are radiated by the laser element 132 to the target medium 138 in such a way that the optical signals 136 are transmitted 140 to the target medium 138 and the acoustic signals 114 are reproduced 112 by means of the target medium 138 takes place, wherein the target medium 138 performs a conversion of the optical signals 136 into the acoustic signals 114 .
- modulated electronic signals 128, 144 are additionally generated according to a modulation step 218, in particular by means of the signal modulator 126, also using the electronic signals 122 received during the receiving step 212 according to step a).
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021200293.5A DE102021200293B4 (de) | 2021-01-14 | 2021-01-14 | Vorrichtung und Verfahren zur Wiedergabe mindestens eines akustischen Signals |
| PCT/EP2022/050640 WO2022152789A1 (de) | 2021-01-14 | 2022-01-13 | Vorrichtung und verfahren zur wiedergabe mindestens eines akustischen signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4278616A1 true EP4278616A1 (de) | 2023-11-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22701902.3A Pending EP4278616A1 (de) | 2021-01-14 | 2022-01-13 | Vorrichtung und verfahren zur wiedergabe mindestens eines akustischen signals |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4278616A1 (de) |
| DE (1) | DE102021200293B4 (de) |
| WO (1) | WO2022152789A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4641377A (en) * | 1984-04-06 | 1987-02-03 | Institute Of Gas Technology | Photoacoustic speaker and method |
| US5694477A (en) * | 1995-12-08 | 1997-12-02 | Kole; Stephen G. | Photothermal acoustic device |
| EP3499315A1 (de) * | 2017-12-15 | 2019-06-19 | InterDigital CE Patent Holdings | Verfahren zur erzeugung einer holographischen version eines videoinhalts mit einem laseranzeigesystem sowie zugehöriges system und computerprogrammprodukt |
| CN108495246A (zh) | 2018-04-28 | 2018-09-04 | 苏州静声泰环保科技有限公司 | 一种点声源发声装置及发声方法 |
-
2021
- 2021-01-14 DE DE102021200293.5A patent/DE102021200293B4/de active Active
-
2022
- 2022-01-13 EP EP22701902.3A patent/EP4278616A1/de active Pending
- 2022-01-13 WO PCT/EP2022/050640 patent/WO2022152789A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| YOICHI OCHIAI ET AL: "Fairy Lights in Femtoseconds : Aerial and Volumetric Graphics Rendered by Focused Femtosecond Laser Combined with Computational Holographic Fields", ACM TRANSACTIONS ON GRAPHICS, vol. 35, no. 2, 19 February 2016 (2016-02-19), US, pages 1 - 14, XP055481553, ISSN: 0730-0301, DOI: 10.1145/2850414 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022152789A1 (de) | 2022-07-21 |
| DE102021200293B4 (de) | 2022-08-11 |
| DE102021200293A1 (de) | 2022-07-14 |
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