EP1248491A2 - Ultraschallbasiertes parametrisches Lautsprechersystem - Google Patents
Ultraschallbasiertes parametrisches Lautsprechersystem Download PDFInfo
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- EP1248491A2 EP1248491A2 EP02007545A EP02007545A EP1248491A2 EP 1248491 A2 EP1248491 A2 EP 1248491A2 EP 02007545 A EP02007545 A EP 02007545A EP 02007545 A EP02007545 A EP 02007545A EP 1248491 A2 EP1248491 A2 EP 1248491A2
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- transducers
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- characteristic curve
- modulation
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- 238000000034 method Methods 0.000 claims description 27
- 238000002604 ultrasonography Methods 0.000 claims description 15
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- 230000005236 sound signal Effects 0.000 abstract description 14
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2217/00—Details of magnetostrictive, piezoelectric, or electrostrictive transducers covered by H04R15/00 or H04R17/00 but not provided for in any of their subgroups
- H04R2217/03—Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves
Definitions
- the invention relates to a method and one suitable for carrying out the method Device according to the preambles of claims 1 and 14.
- a radiation of bundled sound waves requires a sound transducer with a geometric dimension in the range of several wavelengths. Instead of one single transducer can also be used to make a large one To generate geometry. An array of multiple transducers is called an array designated. The individual converters can also be equipped with an upstream Signal processing are provided to increase the directivity of the array.
- the present invention relates to a parametric speaker as Carrier signal uses ultrasound.
- the basic physical experiments go back to the German physicist Helmholz in the 19th century.
- On applicable speaker system is by Yoneyama et al. 1983 described: "The Audio Spotlight: An Application of Nonlinear Interaction of Sound Waves to a new Type of loudspeaker design; J. Acoust.Soc.Am., Vol.73, pp.1532-1536.
- Berktay, Blackstock, Pompei and others have been published in the subsequent years.
- WO 01/08449 A1 describes a method for reproducing audio sound with ultrasound loudspeakers known, the audio signal to be played back by a Sideband amplitude modulation with a carrier signal in the ultrasonic frequency range is linked.
- the modulation is either as ordinary Double sideband AM realized or as a single sideband AM, in which the carrier for further function optimization is suppressed by approx. 12dB.
- transducers with a strongly non-linear frequency response required to realize a linearization of the frequency response in order to to compensate for frequency-dependent amplitude errors.
- the object of the invention is a new method and a new device to find with the features of the preambles of claims 1 and 14.
- the transducer elements in the area of their resonant characteristic with an FM modulated signal controlled.
- the transducer elements are able to Generate AM signal, which is propagated in a gaseous medium Self-demodulation produces an audible signal.
- FIG. 1 shows schematically the method of amplitude modulation known from the prior art.
- Figure 2 shows a block diagram for a parametric speaker.
- Figure 3 shows a system in which several power amplifiers are used.
- Figure 4 shows schematically the structure of a parametric speaker with FM modulation
- FIG. 5 shows the interaction of the characteristic of the modulator and the characteristic of the converter using three examples.
- FIG. 6 shows an FM modulator which consists of two subsystems.
- Figure 7 shows a parametric speaker system based on FM modulation with resonant transducers.
- Figure 8 shows a multi-way speaker system based on parametric speakers.
- FIG. 9 shows an advantageous arrangement of the transducers within a multi-way loudspeaker system
- FIG. 10 shows an RLC network on a converter for generating a resonance point.
- FIG. 11 shows the characteristic curve of the network shown in FIG. 8.
- AM modulation amplitude modulation
- 2-side band AM modulation in English double side band AM, DSB-AM
- s (t) A T cos (2 ⁇ f T t ) (1 + ma N ( t ))
- m denotes the degree of modulation. It lies in the interval 0 ⁇ m ⁇ 1.
- the amplitude of a N ( t ) is a maximum of 1.
- t denotes the time, f T the frequency of the carrier signal.
- Figure 1 shows schematically the original audio signal (10) in the frequency range and the AM modulator (20) which places the audio signal in the frequency range to the right (11) and left (12) next to the carrier frequency.
- the exemplary transfer function (30) of an ultrasound transducer is also shown.
- the ultrasound transducer has the maximum transmission at a frequency f 0 .
- the carrier frequency is tuned to f 0 .
- the two sidebands are emitted according to the transfer function of the converter.
- FIG. 2 shows a block diagram for the parametric speaker.
- the audio signal source (21) feeds the AM modulator (20), which provides the signal for a power amplifier (22) .
- One or more converters (23a-c) are connected to the power amplifier.
- several converters (23a-c) can be used for one loudspeaker system.
- several converters (23a-c) are usually connected in parallel.
- Such an arrangement of several transducers is also called an array.
- FIG. 3 shows such a system, in which several power amplifiers (22a-c) are used.
- the common modulator (20) feeds several power amplifiers (22a-c) to which one or more converters (22a-c) are connected.
- an array directivity i.e. the directivity of the individual converter overlaps with the directivity resulting from the array, so that results in a stronger directivity overall.
- the consideration of the directivity relates first the ultrasound emitted by the transducers. Which The resulting directivity for the audible audio sound can be derived from a model Consideration. After that, the process of self-demodulation represented by a large number of virtual speakers, which are in a three-dimensional Air column are located which is excited by the ultrasound. The overlay of this virtual sources produce the desired audio directivity.
- the present invention uses as in a particularly profitable manner Modulation method the frequency modulation (FM). For this reason, the Envelope of the signal to be emitted by the converter in a different way are generated because the physical principle known from the prior art Self-demodulation should be exploited.
- FM frequency modulation
- the subject of the invention is to be exemplified in the following in conjunction with Ultrasonic transducers are explained in detail. It is assumed that the related ultrasonic transducers are resonative transducers.
- the radiated energy with these ultrasonic transducers depends in part. very strongly of the frequency used. There are one or more frequencies for which the Radiation takes on relatively high values (resonance points). In the neighborhood of this The emitted power decreases more or less strongly from resonance points. This Behavior can be used to generate audible sound.
- Exemplary for resonative ultrasonic transducers can be considered the are made of piezo ceramic.
- H ( f ) be the transfer function of an ultrasonic transducer and f 0 a resonance point. Then the transfer function has a (at least local) maximum at f 0 .
- f T and ⁇ f so that the following always applies: f T + ⁇ f ⁇ a N ⁇ f0 or f T + ⁇ f ⁇ A N ⁇ f0 and if the transfer function H ( f ) is also monotonic in the interval swept in the process, an envelope curve can be generated with frequency modulation which corresponds to the envelope curve with amplitude modulation.
- Areas left and right of a resonance frequency can be selected according to the shown equations are generated an envelope that is in phase with the Useful signal changes or in opposite phase. Both cases can be equivalent to that Generation of amplitude-modulated ultrasound waves can be used.
- FIG 4 shows schematically the structure of a parametric speaker with FM modulation in conjunction with a resonant converter.
- the FM modulator (40) is fed by the audio signal (10) .
- the FM modulator (40) converts the voltage of the audio signal ( 10 ) into a frequency (13) .
- the original frequency width of the audio signal is translated into another frequency width and the frequency position is determined by the frequency f0.
- the bandwidth requirement of an FM signal is infinite. Be in practice Approximations made to narrow the bandwidth requirements accordingly.
- the bandwidth requirement of the FM signal is in relation to the original bandwidth of the audio signal A lot of bandwidth is consumed by the FM signal.
- narrowband FM the bandwidth requirement of the FM signal is in the order of magnitude of the audio signal. Too little FM bandwidth can result in a harmonic distortion. An experimental approach is appropriate here.
- the FM modulator (40) should be understood as a modulator characteristic which translates an input voltage into a frequency.
- the transducer for example: ultrasonic transducer based on a piezo-ceramic
- FIG. 5 shows in 3 examples the interaction of the modulator characteristic and the converter characteristic. It should be noted at this point that in the discussion that follows, for the sake of better understanding, it is said that the converter converts a frequency supplied to it into a voltage.
- FM modulation because of the simpler Representation of the case where a DC voltage is used as the input signal can be specified within an interval. If the lower and the upper value of the If the voltage interval is used, the FM modulation results in a specific frequency interval. However, if a changing voltage is applied, e.g. an audio signal, thus, as already mentioned, theoretically there is one after FM modulation infinite bandwidth of the FM signal.
- the interval can be selected as the minimum size of the frequency interval be characterized by the smallest and the largest amplitude of the input signal results.
- the frequency interval should also be at least 2 times the simple bandwidth of the input signal. If the frequency interval is chosen larger, a higher transmission quality can be achieved. It should be noted that the Adequate size of the resonance edge of the transducer assigned to the frequency interval is available.
- the FM signal can be used with a Bandpass filters are limited before it is fed into the converter.
- a certain one Bandpass effect is already exerted by the converter itself.
- an experimental one for the choice of bandwidth Approach appropriate is an experimental one for the choice of bandwidth Approach appropriate.
- the case shown in FIG. 5 a) is based on a monotonous transducer characteristic part to the left of the resonance frequency f 0 .
- a modulator with a mirrored converter characteristic is required.
- the mirror axis is the 45 ° diagonal in the characteristic field.
- the interaction of the converter characteristic with the (played) modulator characteristic results in a 1: 1 translation of the audio input voltage into an envelope output voltage on the converter.
- the voltage u 0 is translated back into the voltage u 0 and the voltage u 1 is translated back into the voltage u 1 .
- Figure 5 b shows the transducer characteristic and the ideal modulator characteristic for a transducer with a monotonous part of the characteristic to the right of the resonance frequency. The same considerations result as in case a).
- Figure 5 c) shows an example of an ideally adapted modulator in the event that the converter characteristic consists of 2 straight pieces.
- the corresponding ideal modulator characteristic curve is then obtained by mirroring on the 45 ° axis, in accordance with examples a) and b).
- the smallest occurring voltage on the converter characteristic is designated u 1 in cases a) and b) and u 2 in case c).
- the degree of modulation is 100%, ie the envelope generated is in the voltage range from 0 to the maximum value u 0 .
- the degree of modulation can be adjusted by selecting the voltage range on the converter.
- the commonly used FM modulator consists of one Characteristic field from monotonous curve sections which uniquely match an input signal Assign output voltage.
- this FM modulator can preferably be made up of two subsystems.
- Figure 6 shows an FM modulator consisting of 2 subsystems.
- a first characteristic curve system that translates a voltage at the input into a voltage at the output and as a second system a conventional FM modulator. If example c) from FIG. 5 is used, the correction of the converter characteristic curve is the voltage correction line of the first system.
- the voltages u 10 , u 11 , u 12 , etc. result as intermediate values.
- the following conventional FM modulator then only undertakes the "linear" voltage / frequency translation.
- FIG. 1 A parametric loudspeaker system based on FM modulation with resonative transducers is shown in FIG .
- An FM modulator (20) fed by a signal source (21) feeds one or more power amplifiers (22a, ..., 22c), each of which operates one or more converters (23a1, ..., 23c2) .
- the audio signal (50) is divided into several paths by frequency division. For example, 3 paths can be set up: for the low frequencies (51), for the middle frequencies (52) and for the high frequencies (53).
- the signals from each of these "paths" are fed to a corresponding FM modulator ((61), (62) or (63)), an amplifier stage ((71), (72) or (73)) and an associated converter.
- a corresponding FM modulator ((61), (62) or (63)
- an amplifier stage ((71), (72) or (73)
- Different converters with different converter characteristics ((712), (722) or (732)) can be used for the individual paths; for example, converters with higher power are generally used for the low frequencies.
- the multi-way system with FM modulation can be tuned in each of the ways to the resonance frequency f 0 of the respective transducer, corresponding to ((71), (72) or (73)), which results in a good efficiency.
- the converters therefore work under the best possible conditions.
- the choice of a converter type for each path gives the possibility of optimally adapting the bandwidth and power of the converter to the signal of the respective signal path.
- the multi-way system according to the invention can do this in a profitable manner be designed that over the frequency range used Power adjustment of the converter is done in such a way that the selection of the converter a group of converters to the power required in this frequency band is voted. It is also beneficial for each of the groups of Transducers to optimize the respective directivity of the speaker system by the Selection of the transducers of a group of transducers based on the directivity of the individual converter in the respective frequency band.
- the respective directivity of the Speaker system is optimized by the individual groups of transducers, in particular depending on the frequency band assigned to them Input signals of the modulators, different geometrically arranged.
- Figure 9 shows an advantageous embodiment in which 8 transducers are arranged in an outer square (80) .
- the arrangement of the transducers in the form of a square is only intended to serve as an example here.
- Another square (81) with four transducers follows further inside and finally a transverse square (82) consisting of four transducers follows inside the array.
- the entire arrangement is a 3-way system.
- Powerful transducers are preferably arranged for the bass in the outer square, then the transducers for the mids follow further inside and finally the transducers for the heights in the center.
- the transducers are arranged so that the transducers that are the lower Frequencies of the input signal are assigned, located in the outer area of the Find arrangement and that the transducer, which the high frequencies of the Input signals are assigned, can be found in the inner area of the arrangement.
- the transducers, which the high frequencies are assigned to the input signal are arranged close together, and that the Converters, which are assigned to the low frequencies of the input signal, less are densely arranged.
- FIG. 10 shows an RLC network, the capacitance being generated by the converter. Modifications to the network shown are possible, but are not explained in detail here.
- FIG. 11 shows the amplitude voltage U C at the converter input (based on the total output voltage U RLC ).
- C 1nF
- L 10mH
- the RCL network described shows a kind of equivalent circuit diagram of a resonant converter. If the converter is only capacitive, for example, a desired resonance characteristic (90) can be generated by adding R and L accordingly.
- other networks can also be used which are to be referred to here generally as resonative filter networks.
- Embedding the converter in a resonant filter network has the further advantage that the converter itself can generate a higher voltage than the power amplifier outputs. This results in the ability to operate converters that require a high input voltage with little circuitry in the power amplifier.
- the RIC network achieves a voltage gain of approximately 3. That would mean, if the converter is designed for a voltage of eg 1000Volt, that the amplifier only has to be designed for 330Volt. This enables a significantly simpler circuit structure.
- the input signal a warning signal and / or an information signal is fed to the modulators and / or a noise signal (for example for active noise cancellation) and / or a voice signal (for example an interactive voice dialog) and / or a Represents music signal.
- a noise signal for example for active noise cancellation
- a voice signal for example an interactive voice dialog
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
Claims (27)
- Verfahren zur Ansteuerung eines parametrischen Lautsprechersystem, bestehend auseinem oder mehreren Wandlerelementen für Ultraschall, welche in der Lage sind durch geeignete Ansteuerung ein AM-Signal zu erzeugen, welches bei Ausbreitung in einem gasförmigen Medium durch Selbst-Demodulation ein hörbares Signal erzeugen,einem oder mehreren diesen Wandlerelemente zugehörigen Leistungsverstärkerund einem oder mehreren mit diesen verbundene Modulatoren, die als Eingangssignal das Signal einer Quelle erhalten,
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass für den Fall, dass die Wandler keine signifikante resonative Kennlinie aufweisen, die resonative Kennlinie durch die Zusammenschaltung der Wandler mit einem resonativen Filternetzwerk erzeugt wird, in der Weise, dass das Filternetzwerk einschließlich des Wandlers eine Resonanzflanke erzeugt oder vorhandene Flanken der Kennlinie der Wandler so modifiziert, wie sie für eine befriedigende Umsetzung der FM-Modulation in eine AM-Modulation durch den Wandler benötigt werden.
- Verfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die Flanke der resonativen Kennlinie durch eine dem Modulator vorgeschaltete Einheit zur Modifikation der Kennlinie verändert wird,
dahingehend dass sich durch die aus der Veränderung resultierende Gesamt-Kennlinie die Übersetzung des FM modulierten Signals in das vom Wandler ausgesandte AM-Signal beeinflußt wird, indem die Einheit zur Modifikation der Kennlinie eine Spannungs/Spannungs-Übersetzung bewerkstelligt. - Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Einheit zur Modifikation der Kennlinie Unregelmäßigkeiten in der Kennlinie des Wandlers ausgleicht, wodurch sich eine resultierende Gesamt-Kennlinie aus einem oder mehreren geglätteten Kurvenabschnitten ergibt.
- Verfahren nach einem der Ansprüche 3 bis 4, dadurch gekennzeichnet, dass die Einheit zur Modifikation der Kennlinie dazu verwendet wird, dass sie die im Wandler stattfindende FM/AM-Übersetzung linearisiert, wodurch sich durch die resultierende Gesamt-Kennlinie eine ideale AM-Modulation ergibt.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Modulationstiefe der Ansteuerung einstellbar ist, indem die kleinste am Wandler anliegende Ausgangsspannung vorgebbar ist.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Eingangssignal das den Modulatoren zugeführt wird, ein Warnsignal und/oder ein Informationssignal und/oder ein Geräuschsignal und/oder ein Sprachsignal und/oder ein Musiksignal darstellt.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zur Ansteuerung eines parametrischen Mehrwege-Lautsprechersystems die Gesamtheit der Wandler in Gruppen eingeteilt wird, wobei jede Gruppe von mindestens einem ihr zugeordneten FM-Modulator angesteuert wird.
- Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die einzelnen FM-Modulatoren jeweils von einem Signal aus einer Mehrwege-Zerlegung des Eingangssignals gespeist werden, wobei im Rahmen der Mehrwege-Zerlegung eine frequenzmäßige Bandaufteilung des Eingangssignals der Modulatoren vorgenommen wird.
- Verfahren nach einem der Ansprüche 8 bis 9, dadurch gekennzeichnet, dass für den Fall, dass die Wandler welche in mehrere Gruppen eingeteilt werden gruppenabhängig jeweils verschiedene Kennlinien aufweisen, jeweils gruppenabhängig unterschiedliche FM-Modulatoren angewandt werden.
- Verfahren nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass über den verwendeten Frequenzbereich eine Leistungsanpassung der Wandler erfolgt, in der Weise, dass die Auswahl der Wandler einer Gruppe von Wandlern auf die in diesem Frequenzband erforderliche Leistung abgestimmt wird.
- Verfahren nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, dass für jede einzelne der Gruppen von Wandlern die jeweilige Richtwirkung des Lautsprechersystems optimiert wird, indem die Auswahl der Wandler einer Gruppe von Wandlern auf Grund der Richtwirkung des einzelnen Wandlers im jeweiligen Frequenzband erfolgt.
- Verfahren nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass für jede einzelne der Gruppen von Wandlern die jeweilige Richtwirkung des Lautsprechersystems optimiert wird, indem die einzelnen Gruppen von Wandlern, insbesondere in Abhängigkeit des ihnen zugeordneten Frequenzbandes des Eingangssignals der Modulatoren, unterschiedlich geometrisch angeordnet werden.
- Vorrichtung zur Ansteuerung eines parametrischen Lautsprechersystem, bestehend auseinem oder mehreren Wandlerelementen für Ultraschall, welche in der Lage sind durch geeignete Ansteuerung ein AM-Signal zu erzeugen, welches bei Ausbreitung in einem gasförmigen Medium durch Selbst-Demodulation ein hörbares Signal erzeugen,einem oder mehreren diesen Wandlerelemente zugehörigen Leistungsverstärkerund einem oder mehreren mit diesen verbundene Modulatoren, die als Eingangssignal das Signal einer Quelle erhalten,
- Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass für den Fall, dass die Wandler keine signifikante resonative Kennlinie aufweisen, ein Filternetzwerk vorgesehen ist, welches den Wandler einschließt und so eine Resonanzflanke erzeugt, wie sie für eine befriedigende Umsetzung der FM-Modulation in eine AM-Modulation durch den Wandler benötigt werden.
- Vorrichtung nach einem der Ansprüche 14 bis 15, dadurch gekennzeichnet, dass eine Einheit zur Modifikation dem Modulator vorgeschaltetet wird, wodurch die Flanke der Kennlinie des Wandlers verändert wird,
dahingehend dass sich durch die aus der Veränderung resultierende Gesamt-Kennlinie die Übersetzung des FM modulierten Signals in das vom Wandler ausgesandte AM-Signal beeinflußt wird, indem die Einheit zur Modifikation der Kennlinie eine Spannungs/Spannungs-Übersetzung bewerkstelligt. - Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass die Einheit zur Modifikation der Kennlinie so ausgebildet ist, dass sie Unregelmäßigkeiten in der Kennlinie des Wandlers ausgleicht, wodurch sich eine resultierende Gesamt-Kennlinie aus einem oder mehreren geglätteten Kurvenabschnitten ergibt.
- Vorrichtung nach einem der Ansprüche 16 bis 17, dadurch gekennzeichnet, dass die Einheit zur Modifikation der Kennlinie so ausgebildet ist, dass sie die im Wandler stattfindende FM/AM-Übersetzung linearisiert, wodurch sich durch die resultierende Gesamt-Kennlinie eine ideale AM-Modulation ergibt.
- Vorrichtung nach einem der Ansprüche 14 bis 18, dadurch gekennzeichnet, dass ein Mittel vorhanden ist, um die Modulationstiefe der Ansteuerung einzustellen, indem die kleinste am Wandler anliegende Ausgangsspannung vorgebbar ist.
- Vorrichtung nach einem der Ansprüche 14 bis 19, dadurch gekennzeichnet, dass zur Ansteuerung eines parametrischen Mehrwege-Lautsprechersystems die Gesamtheit der Wandler in Gruppen eingeteilt ist, wobei jede Gruppe von mindestens einem ihr zugeordneten FM-Modulator angesteuert wird.
- Vorrichtung nach Anspruch 20, dadurch gekennzeichnet, dass ein Mittel zur Mehrwege-Zerlegung des Eingangssignals vorhanden ist, wobei im Rahmen der Mehrwege-Zerlegung eine frequenzmäßige Bandaufteilung des Eingangssignals der Modulatoren vorgenommen wird.
- Vorrichtung nach einem der Ansprüche 20 bis 21, dadurch gekennzeichnet, dass für den Fall, dass die Wandler welche in mehrere Gruppen eingeteilt werden gruppenabhängig jeweils verschiedene Kennlinien aufweisen, jeweils gruppenabhängig unterschiedliche FM-Modulatoren vorgesehen sind.
- Vorrichtung nach einem der Ansprüche 20 bis 22, dadurch gekennzeichnet, dass über den verwendeten Frequenzbereich eine Leistungsanpassung der Wandler erfolgt, in der Weise, dass die Auswahl der Wandler einer Gruppe von Wandlern auf die in diesem Frequenzband erforderliche Leistung abgestimmt wird.
- Vorrichtung nach einem der Ansprüche 20 bis 23, dadurch gekennzeichnet, dass für jede einzelne der Gruppen von Wandlern die jeweilige Richtwirkung des Lautsprechersystems optimiert wird, indem die Auswahl der Wandler einer Gruppe von Wandlern auf Grund der Richtwirkung des einzelnen Wandlers im jeweiligen Frequenzband erfolgt.
- Vorrichtung nach einem der Ansprüche 20 bis 24, dadurch gekennzeichnet, dass für jede einzelne der Gruppen von Wandlern die jeweilige Richtwirkung des Lautsprechersystems optimiert wird, indem die einzelnen Gruppen von Wandlern, insbesondere in Abhängigkeit des ihnen zugeordneten Frequenzbandes des Eingangssignals der Modulatoren, unterschiedlich geometrisch angeordnet werden.
- Vorrichtung nach einem der Ansprüche 20 bis 25, dadurch gekennzeichnet, dass die Wandler so angeordnet sind, dass die Wandler, welche den niederen Frequenzen des Eingangssignals zugeordnet sind, sich im äußeren Bereich der Anordnung finden und dass die Wandler, welche den hohen Frequenzen des Eingangssignals zugeordnet sind, sich im inneren Bereich der Anordnung finden.
- Vorrichtung nach einem der Ansprüche 20 bis 26, dadurch gekennzeichnet, dass die Wandler, welche den hohen Frequenzen des Eingangssignals zugeordnet sind, dicht beieinander angeordnet sind, und dass die Wandler, welche den tiefen Frequenzen des Eingangssignals zugeordnet sind, weniger dicht (ausgedünnt) angeordnet sind.
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DE10117529 | 2001-04-07 | ||
DE10117529A DE10117529B4 (de) | 2001-04-07 | 2001-04-07 | Ultraschallbasiertes parametrisches Lautsprechersystem |
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EP1248491A2 true EP1248491A2 (de) | 2002-10-09 |
EP1248491A3 EP1248491A3 (de) | 2004-01-07 |
EP1248491B1 EP1248491B1 (de) | 2006-05-31 |
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US (1) | US7181025B2 (de) |
EP (1) | EP1248491B1 (de) |
JP (1) | JP2002315088A (de) |
AT (1) | ATE328455T1 (de) |
DE (2) | DE10117528B4 (de) |
Cited By (1)
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WO2016073362A1 (en) * | 2014-11-05 | 2016-05-12 | Turtle Beach Coproration | Adaptive equalization for an ultrasonic audio system |
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DE10117529B4 (de) * | 2001-04-07 | 2005-04-28 | Daimler Chrysler Ag | Ultraschallbasiertes parametrisches Lautsprechersystem |
US7564981B2 (en) * | 2003-10-23 | 2009-07-21 | American Technology Corporation | Method of adjusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same |
JP4371268B2 (ja) | 2003-12-18 | 2009-11-25 | シチズンホールディングス株式会社 | 指向性スピーカーの駆動方法および指向性スピーカー |
CN101015000A (zh) * | 2004-06-28 | 2007-08-08 | 皇家飞利浦电子股份有限公司 | 无线音频 |
JP4124182B2 (ja) * | 2004-08-27 | 2008-07-23 | ヤマハ株式会社 | アレイスピーカ装置 |
CN1964219B (zh) * | 2005-11-11 | 2016-01-20 | 上海贝尔股份有限公司 | 实现中继的方法和设备 |
JP4783921B2 (ja) * | 2006-03-13 | 2011-09-28 | 三菱電機エンジニアリング株式会社 | 超指向性スピーカー |
DE202009017930U1 (de) | 2008-03-11 | 2010-10-07 | Merkel, Tobias, Dr. | Virtuelles Mikrofon mit fremdmoduliertem Ultraschall |
US8976980B2 (en) | 2011-03-24 | 2015-03-10 | Texas Instruments Incorporated | Modulation of audio signals in a parametric speaker |
JP5817182B2 (ja) * | 2011-03-31 | 2015-11-18 | 日本電気株式会社 | スピーカ装置及び電子機器 |
US10757506B2 (en) | 2014-08-28 | 2020-08-25 | Nanyang Technological University | Amplifier circuit for a parametric transducer and a related audio device |
CN107864020B (zh) * | 2017-11-07 | 2021-02-19 | 哈尔滨工程大学 | 水下小目标单分量声散射回波的变换域提取方法 |
WO2019212077A1 (ko) * | 2018-05-04 | 2019-11-07 | 주식회사 제이디솔루션 | 안정성이 증가된 초지향성 스피커 회로{ultra directional speaker circuit with enhanced stability} |
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- 2002-04-03 DE DE50206958T patent/DE50206958D1/de not_active Expired - Lifetime
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016073362A1 (en) * | 2014-11-05 | 2016-05-12 | Turtle Beach Coproration | Adaptive equalization for an ultrasonic audio system |
US9780753B2 (en) | 2014-11-05 | 2017-10-03 | Turtle Beach Corporation | Adaptive equalization for an ultrasonic audio system |
Also Published As
Publication number | Publication date |
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EP1248491B1 (de) | 2006-05-31 |
DE50206958D1 (de) | 2006-07-06 |
US7181025B2 (en) | 2007-02-20 |
DE10117528B4 (de) | 2004-04-01 |
JP2002315088A (ja) | 2002-10-25 |
EP1248491A3 (de) | 2004-01-07 |
US20020172375A1 (en) | 2002-11-21 |
DE10117528A1 (de) | 2003-02-06 |
ATE328455T1 (de) | 2006-06-15 |
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