WO2024003417A1 - Transducteur basse fréquence sans boîtier, y compris groupé en plusieurs modules, et procédé de génération basse fréquence - Google Patents

Transducteur basse fréquence sans boîtier, y compris groupé en plusieurs modules, et procédé de génération basse fréquence Download PDF

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Publication number
WO2024003417A1
WO2024003417A1 PCT/EP2023/068216 EP2023068216W WO2024003417A1 WO 2024003417 A1 WO2024003417 A1 WO 2024003417A1 EP 2023068216 W EP2023068216 W EP 2023068216W WO 2024003417 A1 WO2024003417 A1 WO 2024003417A1
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WO
WIPO (PCT)
Prior art keywords
frequency
low
sound
transducer
loudspeaker
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PCT/EP2023/068216
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German (de)
English (en)
Inventor
Andreas Baumgärtner
Original Assignee
Baumgaertner Andreas
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baumgaertner Andreas filed Critical Baumgaertner Andreas
Publication of WO2024003417A1 publication Critical patent/WO2024003417A1/fr

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Classifications

    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention deals with a low-frequency sound transducer (or colloquially also referred to as a low-frequency generator), i.e. a type of loudspeaker device that is also often referred to in the specialist press (due to its covered frequency range) as a sub-woofer referred to as.
  • a frequency band sound transducer and vibrator in a lower frequency band range, e.g. B. in the range of less than 200 Hertz (preferably 120 Hertz or even 100 Hertz (cutoff frequency)), with at least two dipole loudspeakers according to the preamble of claim 1.
  • the present invention deals with a modular system that can be set up or equipped with almost any power System according to the preamble of claim 18.
  • a particularly good operating method or frequency generation method according to the preamble of claim 19 is addressed.
  • Technical area for the frequency range which is considered the bass range in the high-fidelity range (hi-fi range)
  • sound transducers especially as part of a music or home cinema system
  • the woofers and the sub-woofers are characterized by their frequency ranges, which are terminated by cutoff frequencies (such as 0.7 times the standard frequency response).
  • the sound frequencies to be emitted are specified to the sound transducer by electrical signals and then converted into sound, hence the term “sound transducer”.
  • the US 2002076062 A1 shows in its illustrations a double loudspeaker system arranged in a housing with output tubes, which can be operated as a monopole loudspeaker system.
  • WO 2022029005 A1 describes a sound generating box composed of two loudspeakers, whereby the entire system of loudspeakers and their box function similarly to an organ pipe and thus form a monopole loudspeaker system.
  • the DE 102014114870 A1 shows how four loudspeakers, all aligned in the same direction, can be located along a main radiation direction in which the (imaginary) listener should be located in order to form a dipole loudspeaker system.
  • CH 558119 A deals with the situation in which two loudspeakers that are poorly tuned to one another, each of which has a frequency increase, can compensate for the deviation in the frequency responses of one loudspeaker to the other loudspeaker by means of a phase shift of 180°.
  • CH 558119 A deals with the topic of “compensation in a playback curve”, but it does not deal with the actual playback of the music by the loudspeaker arrangement.
  • Low frequency (sound) transducers may be intended to be placed on the floor of a building or a room of the building. Alternatively, the bottom of a shelf or cupboard can of course also be used as a storage area.
  • the floor is a floor that can vibrate, e.g. B. a wooden floor that rests on wooden beams, e.g. B.
  • the low frequency transducer is intended to be placed on a flat surface such as a floor, especially on a board containing a (natural/organic) fibrous material such as wood chips, wood chips, sawdust or pieces of wood.
  • the low-frequency converter includes at least a first loudspeaker and a second loudspeaker. Both speakers are arranged so that they can work as dipole speakers. They are designed as dipole speakers. The speakers are arranged oriented.
  • the first loudspeaker can be oriented with its membrane side towards a base of the low-frequency (sound) transducer.
  • the first loudspeaker is arranged in the low-frequency (sound) transducer for free-oscillating sound generation.
  • the dipole speakers sound waves can be coupled out at different points. The result is a more room-filling sound compared to many other sub-woofers (based on the electrical power to be applied).
  • the low-frequency sound transducer is advantageously equipped with a support structure, it does not have a housing. This allows the dipole sound transducers to emit unadulterated sound waves in many areas.
  • the low-frequency transducer which is designed to emit acoustic waves as well as to initiate body-conducted vibrations, is ideally connected to a plate, e.g. B. a wooden board (examples include: solid wood board, plywood board, OSD board) in order to use the board to absorb and transmit vibrations, the so-called body-conducted frequencies.
  • a plate e.g. B. a wooden board (examples include: solid wood board, plywood board, OSD board) in order to use the board to absorb and transmit vibrations, the so-called body-conducted frequencies.
  • the entire structural unit consisting of the actual low-frequency converter and the plate can therefore be referred to as a low-frequency converter.
  • the low-frequency converter develops its advantages when a user receives more than just acoustic signals from it.
  • a user of the low-frequency converter advantageously receives an acoustic signal and a frequency spectrum that resonates in a floor, which can be coordinated with the respective acoustic signal and its frequency spectrum.
  • the low frequency transducer has feet which are present at the ends of the rods and which connect to the plate.
  • the plate is ideally mounted so that it can oscillate.
  • the panel may advantageously be made from a natural fiber material such as wood.
  • the rods can be designed in such a way that they mechanically pass through the plate.
  • the rods can be coupled to the plate via damping elements.
  • the rods are connected to the plate, which means that vibrations can be transmitted to the plate.
  • the plate serves to conduct vibrations.
  • the air serves for acoustic transmission or acoustic conduction.
  • the low-frequency converter especially if it is to be used to generate acoustic signals, has at least two loudspeakers.
  • the second loudspeaker is arranged flush with the first loudspeaker.
  • the loudspeakers lie in a vertical axis to the base.
  • the low-frequency sound transducer has a free-swinging sound transducer as a second loudspeaker. Its front is oriented in a direction away from the ground. The back of the second speaker looks like a mirror surface to the back of the first speaker.
  • the speakers are arranged in a mirror image of each other. They are arranged in mirror symmetry with respect to a point in the middle between the speakers.
  • the low-frequency sound transducer is designed to generate sound in a frequency range of up to 200 Hertz, preferably 120 Hertz, most preferably up to 100 Hertz.
  • the frequency range of the low-frequency sound transducer is designed for a lower limit frequency either at 20 Hertz, in particular at 25 Hertz, or above a resonance frequency of one of the two loudspeakers, in particular above a resonance frequency of both loudspeakers.
  • the resonance frequency of both speakers can be (almost) identical.
  • the low-frequency transducer may have speakers designed for an identical frequency response. Minor deviations arise from typical constructional deviations from loudspeakers of the same type. If one loudspeaker has a resonance frequency at exactly 12 Hz, an identical loudspeaker can have a resonance frequency at e.g. B. 12.1 Hz or just 11.95 Hz. Such scatter results from the deviations in the manufacturing process of the loudspeakers that are typical for the construction and/or installation space.
  • the low-frequency sound transducer includes rods that form a support ring made of rods, e.g. B. 8 bars, in an alternative embodiment 10 bars or even 12 bars.
  • the number of rods depends on the weight of the speakers and the electrical power to be converted.
  • the low-frequency sound transducer is designed without a housing, but the bars form a grid structure. Two of the speakers are located between the bars.
  • the low-frequency sound transducer stands on circumferentially arranged feet, preferably with rubber bearings. The feet ensure a distance from the floor or standing surface. The feet can create a space between the first speaker and the base.
  • the low-frequency sound transducer is advantageously designed without a housing.
  • the low-frequency sound transducer can have connections.
  • the connections can be in the area of the ends of its rods.
  • the connections can be used to connect a first low-frequency sound transducer with a low-frequency sound transducer of the same type.
  • the low-frequency sound transducer has a first acoustic zero level.
  • the low-frequency sound transducer has a second acoustic zero level.
  • the low-frequency sound transducer has several acoustic zero levels.
  • the first acoustic zero plane can extend in an extension of a first membrane of the first loudspeaker and the second acoustic zero plane can extend in an extension of a second membrane of the second loudspeaker.
  • the low-frequency sound transducer is free of housing sound reflections and/or housing resonance. It can emit a sound wave without housing sound reflections and/or housing resonance.
  • the low-frequency sound transducer is advantageously designed in such a way that there is at least one plane on the low-frequency sound transducer adjacent to an area around the second loudspeaker for supporting one or more loudspeakers.
  • Mid-frequency sound e.g. 1,000 Hz to 5,000 Hz
  • high-frequency sound higher than e.g.
  • the first speaker and the second speaker are compound dipole speakers.
  • a synchronous airborne sound wave can be coupled out from a housing-free area of the low-frequency sound transducer.
  • the low frequency sound transducer has feet on one side.
  • the low frequency sound transducer may comprise a plate.
  • the feet of the low frequency transducer can be connected to the plate.
  • the plate can take on the role of a membrane or an oscillatable transmitter.
  • the plate is ideally mounted so that it can oscillate. It is advantageous if the plate is made of a natural fiber material.
  • a suitable material for the panel is wood, e.g. B. a solid wood panel.
  • the feet can connect to the plate mechanically through the plate.
  • the plate can be connected to the feet via damping elements.
  • the feet have damping elements through which the low-frequency sound transducer is continued onto the plate.
  • the rods of the low frequency sound transducer and the plate are coupled. Feet and plate are connected in such a way that micro-vibrations can be transferred to the plate.
  • the vibration stroke of the loudspeaker generated by a Lorenz force is passed on to the plate (in a mirror image) via the rods.
  • a synchronous airborne sound wave can be coupled out from a housing-free area of the low-frequency sound transducer.
  • the low-frequency sound transducer can be operated as a low-frequency sound transducer with dipole radiation because it comprises at least two loudspeakers, i.e. at least a first loudspeaker and a second loudspeaker.
  • the low-frequency sound transducer offers the possibility of dipole operation.
  • the low-frequency converter can - depending on the mode of operation - fulfill the function of a dipole loudspeaker.
  • an acoustic dipole e.g. B. generated by dipole speakers
  • the sound radiation is not the same in all directions.
  • the sound pressure depends on the angle ⁇ , the angle to the main axis. While there is strong sound radiation for angle ⁇ values of 0° and 180°, there is no radiation for angle ⁇ values of 90° and 270°.
  • the directional dependence can be represented in a directional diagram.
  • a directional dependence can also be derived from a dipole model (see Figure 4). A characteristic “8” results for a dipole.
  • a dipole loudspeaker emits the sound waves similar to an “8”.
  • the directional dependency is actually three-dimensional and the image shown results for each plane containing the axis.
  • a sound pressure effective value in a certain direction and distance can be related to the sound pressure effective value that is in the direction of maximum radiation and in is determined, measured or determined at the same distance (as the first effective sound pressure value, i.e. that in a certain direction). This ratio is the guide factor.
  • the dipole behavior of a sound transducer can also be described using its reflections (in the sense of a second explanatory model).
  • a dipole radiation also a bipole radiation
  • the resulting low lateral radiation behavior is likely to be advantageous in at least some sound scenarios in order to contribute to a more realistic sound reproduction of a spatially distributed sound (producing) body (e.g. a band or an orchestra).
  • a time window in the range of 10 ms to 50 ms can be guaranteed in which a
  • the sound reflected from the rear also corresponds tonally to the direct sound. Since the sound is emitted backwards (or upwards) at the same level as downwards, the reflected sound will reach the listener at least similarly loud, i.e. with a level (or sound pressure) that differs by a few percent. This assumption applies in cases where a listener is not sitting directly in the so-called “sweet spot” of the direct sound.
  • the reflected sound from behind contributes to bringing the overall sound spectrum that reaches the listener within the time window into an appropriate volume ratio.
  • a low-frequency sound transducer with a dipole or bipole function as dipole or bipole radiation behavior
  • the reflections (of the rear sound) arrive at the listener later or delayed (within the time window), more directed and louder.
  • the listener who is ideally located at the predetermined listening location (e.g. a visitor area in front of a concert stage), perceives the spatial sound or the respective frequency spectrum of the low-frequency sound transducer, which is equipped with a dipole loudspeaker, several times thanks to the reflections.
  • the low-frequency sound transducer has free-swinging sound generators because they can radiate their sound in all directions, i.e. in any direction.
  • the design-specific radiation spaces can initially be viewed as spherical cloud-free radiation.
  • the sound generator can radiate in any direction. However, the sound generator itself has a preferred radiation direction due to its design. If the sound generator is replaced in a low-frequency sound transducer, a changed radiation characteristic with a changed angle ⁇ can be generated.
  • the usual air suspension which results from enclosing an air column in a housing, no longer has a dampening effect with a free-swinging sound generator.
  • each loudspeaker can be supplied with power in the kilowatt range and convert this into sound or vibrations. The 3 kW (or 5 kW) of the one speaker
  • the present invention deals with a low frequency transducer capable of realizing not only sound waves but also vibrations (and oscillations) in the infrasonic range.
  • the frequency response of the sound transducers which are referred to in the trade press as sub-woofers, can reproduce frequencies up to the limit of human hearing, typically 20 Hz.
  • the present low-frequency converter can easily reproduce frequencies up to just over 0 Hertz, for example up to one Hertz (1 Hz).
  • the mass-spring system can be designed in numerous different shapes and embodiments (rod-damper-wood, rod-screw-wood, 1st transformer-coupling element-2nd transformer).
  • a stage or a flat surface (a plate) created specifically for this purpose can be used for the body-guided vibrations. It is generally advantageous if the body, like the stage, has flexibility that should be dimensioned such that the vibrations in the body can be passed on (soft bearing).
  • the plate consists of a natural fiber material or a natural fiber material.
  • a suitable material for the panel is wood, e.g. B. the panel can be a solid wood panel.
  • the feet can be screwed mechanically through the plate to the plate. In this way, ie through the screw connection, the rods of the low-frequency converter are firmly coupled to the plate.
  • Another advantage arises from the fact that the design of the low-frequency converter is modular. This means that instead of two, four or six (and even more than six) speaker levels can be arranged or stacked on top of each other.
  • stacking makes a structure of a multi-layer low-frequency converter or a group of low-frequency converters (in the sense of a set) higher, the arrangement of several similar low-frequency converters that are connected together does not lose its stability - because of the tight screw connection. Stable mounting can be considered a prerequisite for setting up more than 2 speakers.
  • the screw connection can also be dispensed with.
  • the low-frequency converter is provided with special feet.
  • the feet can have damping elements via which the low-frequency converter is continued onto the plate. The feet and the plate are connected in such a way that vibrations can be transferred to the plate.
  • the invention was initially designed in connection with a system for musical performances in dance halls, concert halls, hi-fi studios, as a home theater, on concert stages, etc., but the area of application extends far beyond this range of applications.
  • Another possible application for an object according to the invention is sound for (so-called) moments of relaxation. During such phases, people enjoy being able to consume their music while lying down. The vibrations emanating from the plate are sensed by the human body when a person lies on the plate, which is perceived as very pleasant. Music therapy applications are also possible. When used in music therapy, the fact that the low frequencies of music (up to 120 Hertz or up to 200 Hertz) can not only be heard but also felt can be used sensibly.
  • the low-frequency converter described here can represent an interesting alternative to “classic” sub-woofer boxes, particularly for people who find today's, sometimes very bass-heavy music reproduction unpleasant. But even for music consumers with a higher tolerance threshold, prolonged enjoyment of music in dance halls and music festivals can cause hearing damage and lead to severe fatigue due to the particularly high volume and the dominant bass sound. On the other hand, emissions and emissions from the low-frequency converter can be consumed for much longer without a similar (damaging or unpleasant) result occurring. This makes it possible to combine several low-frequency sound transducers into a larger unit that emits a higher sound power. Brief description of the figures The present invention can be understood even better if reference is made to the accompanying figures, which exemplify a particularly advantageous design option without restricting the present invention to these.
  • Figure 1 shows a possible embodiment of a low-frequency sound transducer.
  • Figure 2 shows an unequalized frequency response.
  • Figure 3 shows an equalized frequency response.
  • Figure 4 shows the dipole model graphically.
  • Figure 5 presents a first alternative embodiment compared to Figure 1.
  • Figure 6 presents several second alternative embodiments in comparison with Figure 1.
  • Figure 7 presents a first alternative embodiment in comparison with Figure 1.
  • a first loudspeaker 5 and a second loudspeaker 6 are shown in a mirror-image arrangement in FIG.
  • the loudspeakers 5, 6 are kept at a distance via rods, the so-called coupling rods 2.
  • the loudspeakers form the chassis 4 with the coupling rods 2.
  • the feet stand on spikes 3.
  • the low-frequency sound transducer 1 is open.
  • the low-frequency sound transducer 1 has no housing.
  • the low-frequency sound transducer 1 works with two loudspeakers 5, 6 for lower frequencies, which work as dipoles. Typical frequency curves can be seen in Figures 2 and 3.
  • the dipole principle can be seen in Figure 4.
  • FIG 1 shows a schematic representation of a first embodiment of a low-frequency converter 1, to which rods 2 belong.
  • the rods 2 transmit a signal or the control of the floor, which is designed like a plate, i.e. like a plate 50.
  • the two loudspeakers 5, 6 are arranged in a mirror image within the rods 2.
  • the rods 2 are supported on the plate 50 via their spikes 3.
  • Each loudspeaker 5, 6 has its own radiation characteristic, which is also influenced by the loudspeaker suspension 7.
  • the sound radiation angle ⁇ is determined by the type of loudspeaker 6.
  • the sound radiation angle is usually determined on the membrane side 8 of the loudspeaker 6.
  • Both loudspeakers 5, 6 together with the chassis 4 create a modular dipole loudspeaker 10 (compound).
  • the frequency diagram of Figure 2 shows the attenuation in decibels, reference number 26 (FR Magnitude dB V/V (1/3oct)) as a function of the frequency 28 (in Hertz), which is plotted on the x-axis (in logarithmic representation). , which is plotted on the y-axis.
  • reference number 26 FR Magnitude dB V/V (1/3oct)
  • the frequency 28 in Hertz
  • the x-axis in logarithmic representation
  • y-axis As can be seen from the frequency diagram in FIG . 6 II , 6 III linear up to a frequency of approx. 200 Hz (right). At frequencies greater than 200 Hz, the sound pressure drops (down to -45 dB at approx. 4 kHz).
  • the curve shown in the frequency diagram of FIG. 2 was determined using a computer program 24 for acoustic measurements (ARTA). When measuring can
  • any frequencies and frequency points can be determined, e.g. B. point 22 (cursor: 20.1 Hz, - 13.31 dB, Basurman solo near field). It is a near-field measurement 20 of the frequency response. If the unfiltered curve according to Figure 2 is displayed as an equalized frequency response in the near field, a lower cutoff frequency results (see Figure 3). The diagram in FIG. 3 is comparable with the diagram in FIG the frequency in Hertz 38. If the (frequency response) curves according to Figure 2 and Figure 3 are scaled the same, they can even be placed on top of each other to make a better comparison.
  • the cutoff frequency which can be read from Figure 3, is (only) around 100 Hz. From around 100 Hz (frequency of the acoustic signal) the strength of the level drops. At 500 Hz the sound pressure has already fallen to approx. -45 dB. This curve was also measured using a computer program 34 (ARTA).
  • the equalized near-field measurement of the frequency response 30 shows the playback curve of one of the two loudspeakers in the near field. Measuring point 32 is in the same place, at 20.1 Hertz. From the dipole model 40 shown in Figure 4 with the dipole axis 42 it can be seen that the two loudspeakers 4, 5 (see Figure 1) are installed in the chassis 4 in the same phase.
  • Movements of the rods 2 I , 2 II , 2 III are initiated into the plate 50 via the feet 3 I , 3 II , 3 III . Thanks to the loudspeaker suspension 7 I , 7 II , 7 III, movements of the respective loudspeaker 5 I , 5 II , 5 III , 6 I , 6 II , 6 III are introduced into the rods 2 I , 2 II , 2 III .
  • the vibrations caused by driving the loudspeakers 5 I , 5 II , 5 III , 6 I , 6 II , 6 III (Lorenz force of the magnetic coil of the respective loudspeaker 5 I , 5 II , 5 III , 6 I , 6 II , 6 III ).
  • the rods 3 I , 3 II , 3 III of the chassis 4 I , 4 II , 4 III are forwarded to the plate 50 via the feet 3 I , 3 II , 3 III .
  • the acoustic sound which is emitted from the membrane side 8 I , 8 II , 8 III of the loudspeaker 5 I , 5 II , 5 III , 6 I , 6 II , 6 III , is partially reflected on the plate 50 or by walls and from the ceiling of the room in which the low-frequency converter 1 I , 1 II , 1 III is located.
  • a dipole behavior of the loudspeakers 5 I , 5 II , 5 III , 6 I , 6 II , 6 III can be additionally developed.
  • FIGS. 5, 6 and 7 further embodiment variants of a modular dipole loudspeaker 10 I , 10 II , 10 III are shown.
  • FIG. 5 shows a low-frequency converter 1 I with wide feet 3 I.
  • Figure 6 shows a low-frequency converter 1 II with feet 3 II that include rubber shoes. The rubber shoes are designed either like tubs, like bowls, like blocks or like tampers. Due to its design, each Foot 3 II has its own transmission characteristic that can be adjusted from room to room and from concert stage to concert stage.
  • Figure 7 shows a low-frequency converter 1 III with feet 3 III that are screwed into the plate 50.
  • a low-frequency converter 1 III has free-swinging sound generators 5 III , 6 III , because these can radiate their sound in all directions, i.e. in any direction.
  • the design-specific radiation spaces can initially be viewed as spherical cloud-free radiation.
  • the present low-frequency converter 1 III can easily reproduce frequencies up to just over 0 Hertz, for example up to a range of one Hertz (1 Hz).
  • the effect of the low-frequency converter 1 III is further improved if the mass-spring system of the low-frequency converter 1 III operates with a plate that, for. B. can be screwed to rods 2 III in order to transmit part of the sound generator movement of the sound generators 5 III , 6 III generated by a Lorenz force stroke as body-conducted sound into spatial elements, such as. B. in a concert stage.
  • the design options shown in the individual figures can also be combined with one another in any form.
  • All four low-frequency converters 1, 1 I , 1 II , 1 III shown in Figures 1, 5, 6 and 7 are open, housing-less low-frequency converters, the speakers of which are 5, 5 I , 5 II , 5 III , 6, 6 I , 6 II , 6 III via the connection on the feet 3, 3 I , 3 II , 3 III (rubber shoes, spikes, stamps, screw connections) emit part of the converted (electrical) energy into structure-borne sound or into a vibration of the plate 50 arranged underneath. In this way, bass-heavy music can be perceived as pleasant music with a bass component, which transmits part of it as vibrations (possibly even frequency-offset).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

Un transducteur basse fréquence 1III a des générateurs de sons 5III, 6III qui vibrent librement, car ils peuvent émettre leur son dans toutes les directions, c'est-à-dire n'importe où. Les espaces de rayonnement liés à la conception peuvent d'abord être considérés comme un rayonnement non sphérique. Le présent transducteur basse fréquence 1III peut reproduire sans problème des fréquences jusqu'à un peu plus de 0 Hertz, par exemple jusqu'à un Hertz (1 Hz). L'effet du transducteur basse fréquence 1III est encore amélioré lorsque le système masse-ressort du transducteur basse fréquence 1III fonctionne avec un panneau, qui peut être vissé sur les tiges 2III par exemple, afin d'introduire une partie du mouvement des générateurs de son 5III, 6III généré par une déflexion de la force de Lorentz, en tant que son conduit par le corps dans les éléments de la pièce, tels que la scène d'un concert.
PCT/EP2023/068216 2022-07-01 2023-07-03 Transducteur basse fréquence sans boîtier, y compris groupé en plusieurs modules, et procédé de génération basse fréquence WO2024003417A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202022103685.3U DE202022103685U1 (de) 2022-07-01 2022-07-01 Gehäuseloser Niederfrequenzwandler
DE202022103685.3 2022-07-01

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH558119A (en) 1974-02-18 1975-01-15 Lanfranchi Maurice Enclosure of loud speakers - contains two sub-enclosures positioned to eliminate resonance frequency by phase cancellation
DE19830947A1 (de) 1998-07-10 2000-01-27 Axel Ridtahler Basslautsprecheranordnung
DE20111358U1 (de) 2001-07-07 2001-12-20 Lohnert Richard Lautsprechergehäuse
US20020076062A1 (en) 1999-08-26 2002-06-20 Henry E. Juszkiewicz Low frequency speaker system
DE202004003360U1 (de) 2004-03-04 2004-05-13 Jazz Hipster Corp., Chung-Ho Lautsprecheranordnung
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