CN115938337A - Ultrasonic transducer array, directional sounding control method and directional sounding device - Google Patents
Ultrasonic transducer array, directional sounding control method and directional sounding device Download PDFInfo
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Abstract
The invention discloses an ultrasonic transducer array, a directional sounding control method and a directional sounding device, wherein the ultrasonic transducer array comprises at least two ultrasonic transducer sub-arrays which are arranged at intervals, sounding frequency bands of ultrasonic waves sent by any two adjacent ultrasonic transducer sub-arrays are different, sounding areas of any two adjacent ultrasonic transducer sub-arrays are intersected to form an ultrasonic intersection area, the ultrasonic intersection area is positioned in the whole sound source radiation area of the ultrasonic transducer array, and the ultrasonic waves of different sounding frequency bands of the ultrasonic intersection area are self-demodulated under the action of air to form difference frequency audible sound; the ultrasonic transducer array can realize high audible sound directivity, shorten the propagation distance and improve the privacy.
Description
Technical Field
The invention relates to the technical field of directional sounding, in particular to an ultrasonic transducer array, a directional sounding control method and a directional sounding device.
Background
As shown in fig. 1, the sound production principle of the conventional parametric array speaker is: difference frequency audible sound (frequencies f1-f 2) is produced by air nonlinear self-demodulation by finite amplitude ultrasound (ultrasonic frequencies f1 and f2, respectively). Conventional parametric array loudspeakers typically use a plurality of identical ultrasonic transducers to form an array, the ultrasonic transducers in the array simultaneously emitting ultrasonic waves at frequencies f1 and f2, and the individual ultrasonic transducers are typically circular or square in shape, as shown in fig. 2 and 3. Ultrasonic beams of different frequency bands can be demodulated by ultrasonic waves of two frequencies in the forward transmitting process, and the two frequencies have an accumulative effect. As shown in fig. 4, the virtual difference frequency audible sound sources with frequencies f1-f2 formed cumulatively form an end-fire-like loudspeaker, thereby realizing highly directional difference frequency audible sound beams and an ultra-long difference frequency audible sound propagation distance. In the absence of a human head or other obstruction, the conventional parametric array speaker forms an ultrasonic convergence region (i.e., a sound-listening region) as shown by a shaded region in fig. 5, in which the sound pressure level of the audible sound is high, for example, the sound pressure level of the audible sound band around 1kHz can reach up to 80dB.
Under the condition that a human head, a human body and other shelters exist, the conventional parametric array loudspeaker reflects the human head and the human body, so that ultrasonic waves with different frequencies are more in intersection, an ultrasonic intersection area is expanded to be a shadow area shown in fig. 6, and a visible ultrasonic intersection area exceeds a sound source radiation area of the parametric array loudspeaker. Just because the supersound intersection region is big, directive property is weak, and propagation distance is far away, simultaneously because the increase of left and right reflection sound is difficult to confirm specific audible sound region, can hear the sound at people's left and right sides all around, and the privacy is relatively poor.
However, when the parametric array speaker is applied to some usage scenarios such as voice call, web conference, etc., it is desirable to achieve short propagation distance while achieving high directivity, so as to reduce the sound behind the audio receiver in the usage area, reduce the environmental reflection caused by the sound wave propagating to the wall, etc., and improve the privacy of sound emission. This is not achievable with conventional parametric array loudspeakers.
Therefore, it is highly desirable to find a parametric array speaker capable of simultaneously realizing high directivity, short propagation distance, and improved sound privacy.
Disclosure of Invention
The invention aims to provide an ultrasonic transducer array, a directional sounding control method and a directional sounding device, wherein the ultrasonic transducer array can meet the privacy requirement of sounding audible sound.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, an ultrasound transducer array is provided, where the ultrasound transducer array includes at least two ultrasound transducer sub-arrays arranged at intervals, sounding frequency bands of ultrasound waves emitted by any two adjacent ultrasound transducer sub-arrays are different, and sounding areas of any two adjacent ultrasound transducer sub-arrays intersect to form an ultrasound intersection area, where the ultrasound intersection area is located in a whole sound source radiation area of the ultrasound transducer array, and the ultrasound waves in different sounding frequency bands of the ultrasound intersection area are self-demodulated under the action of air to form difference frequency audible sound.
In a preferred embodiment, the at least two ultrasound transducer sub-arrays are formed by dividing one ultrasound transducer array, or are independently arranged.
In a preferred embodiment, the sound emitting surfaces of the at least two sub-arrays of ultrasonic transducers are located in the same plane.
In a preferred embodiment, the interval between any two adjacent ultrasonic transducer sub-arrays is not more than 0.2m.
In a preferred embodiment, the width of the ultrasound transducer array in a horizontal direction parallel to the ears of the respective audio recipients is no greater than 1.5m.
In a preferred embodiment, the distance between the center point of a connecting line formed by the two ears of the corresponding audio receiver and the sound emitting surface of the ultrasonic transducer array is not more than 2m.
In a preferred embodiment, the at least two sub-arrays of ultrasound transducers are regularly arranged or irregularly arranged.
In a preferred embodiment, the at least two sub-arrays of ultrasound transducers form a one-dimensional or two-dimensional array arrangement, or form a ring array arrangement.
In a second aspect, a directional sound emission control method is provided, which is applied to the ultrasound transducer array according to any one of the first aspect, and includes:
one sub array of two adjacent ultrasonic transducer sub arrays receives a first electric signal, and the other sub array receives a second electric signal;
one of the ultrasonic transducer sub-arrays emits a first ultrasonic beam under the action of the corresponding first electric signal, the other ultrasonic transducer sub-array emits a second ultrasonic beam under the action of the corresponding second electric signal, the first ultrasonic beam and the second ultrasonic beam are intersected to form an ultrasonic intersection region, and ultrasonic waves in different sounding frequency bands of the ultrasonic intersection region are self-demodulated under the action of air to form difference frequency audible sound.
In a third aspect, a directional sound production device is provided, the directional sound production device comprising the ultrasonic transducer array according to any one of the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an ultrasonic transducer array, a directional sounding control method and a directional sounding device, wherein the ultrasonic transducer array comprises at least two ultrasonic transducer sub-arrays which are arranged at intervals, sounding frequency bands of ultrasonic waves sent by any two adjacent ultrasonic transducer sub-arrays are different, sounding areas of any two adjacent ultrasonic transducer sub-arrays are intersected to form an ultrasonic intersection area, the ultrasonic intersection area is positioned in the whole sound source radiation area of the ultrasonic transducer array, and the ultrasonic waves of different sounding frequency bands of the ultrasonic intersection area are self-demodulated under the action of air to form difference frequency audible sound; according to the invention, by arranging the plurality of ultrasonic transducer sub-arrays which are arranged at intervals and the mode that the two adjacent ultrasonic transducer sub-arrays respectively emit ultrasonic waves with different frequency bands, the purpose that audible sound can be generated only at the intersection of the wave beams of the two adjacent ultrasonic transducer sub-arrays is realized, so that the audible sound area of the ultrasonic transducer is reduced, the high directivity of the audible sound is realized, the propagation distance is shortened at the same time, and the privacy when the ultrasonic transducer array is applied is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional parametric array loudspeaker in the background art;
fig. 2 and 3 are ultrasonic transducer arrays in which the ultrasonic transducers are circular or square, respectively;
FIG. 4 is a far-away schematic view of a conventional parametric array speaker with high directivity and long propagation distance;
FIG. 5 is a schematic diagram of the audible sound region of a conventional parametric array speaker whose propagation path is free of humans;
FIG. 6 is a schematic diagram of the audible sound region with a person in the propagation path of a conventional parametric array speaker;
FIG. 7 is a schematic diagram of an ultrasonic transducer radiating ultrasonic waves according to one embodiment;
FIG. 8 is a schematic diagram of an embodiment in which an ultrasonic transducer radiates ultrasonic waves and there is an audio receiver in the beat frequency audible region;
fig. 9 to 11 are schematic structural diagrams of different layout manners of the ultrasonic transducer array in the first embodiment;
FIG. 12 is a schematic structural diagram of another arrangement of the ultrasonic transducer array in the second embodiment;
fig. 13 is a schematic view corresponding to the ultrasonic transducer of fig. 12 radiating ultrasonic waves.
The mark in the figure is: 100 200-ultrasonic transducer array, 10-ultrasonic intersection region, 20-sound source radiation region, 30-first ultrasonic transducer sub-array, 40-second ultrasonic transducer sub-array, 50-first difference frequency audible sound region, 60-third ultrasonic transducer sub-array, 70-second difference frequency audible sound region.
Description of the preferred embodiment
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
As shown in fig. 7, the present embodiment provides an ultrasound transducer array 100, where the ultrasound transducer array 100 includes at least two ultrasound transducer sub-arrays arranged at intervals, and the sounding frequency bands of the ultrasound waves emitted by any two adjacent ultrasound transducer sub-arrays are different. Moreover, the sounding areas of any two adjacent ultrasonic transducer sub-arrays are intersected to form an ultrasonic intersection area 10, and the ultrasonic waves of different sounding frequency bands in the ultrasonic intersection area 10 are self-demodulated under the action of air to form differential-frequency audible sound. The ultrasonic intersection region 10 formed in this way is located in the entire sound source radiation region 20 of the ultrasonic transducer array 100, and the ultrasonic intersection region 10 is much smaller than the sound source radiation region 20, so that the audible sound region of the ultrasonic transducer array 100 is reduced, high audible sound directivity is realized, the propagation distance is shortened, and the privacy when the ultrasonic transducer array 100 is applied is improved.
Any ultrasonic transducer in the at least two ultrasonic transducer sub-arrays has the same or different shape, and the shape includes but is not limited to at least one of a circle and a rectangle. And, at least two ultrasound transducer sub-arrays included in the ultrasound transducer array 100 are regularly arranged or irregularly arranged, which may specifically be: the at least two sub-arrays of ultrasound transducers form a one-dimensional array arrangement (fig. 9), a two-dimensional array arrangement (fig. 10) or a ring array arrangement (fig. 11). In order to realize the audible sound region in a customized manner, the present invention is applicable to any arrangement and combination of the above.
For convenience of description, the present embodiment is further described in detail by taking the example that the ultrasound transducer array 100 includes a first ultrasound transducer sub-array 30 and a second ultrasound transducer sub-array 40 which are adjacently disposed. The first ultrasonic transducer sub-array 30 emits a first ultrasonic beam in a first ultrasonic frequency band f1, the second ultrasonic transducer sub-array 40 emits a second ultrasonic beam in a second ultrasonic frequency band f2, and f1 is different from f2, and a part of the first ultrasonic beam and a part of the second ultrasonic beam engraved at the same time are converged in a propagation direction to form an ultrasonic intersection region 10. It will be appreciated that the ultrasonic intersection region 10 is located within the acoustic source radiating area 20, i.e., the ultrasonic intersection region 10 is smaller than the acoustic source radiating area 20.
In one embodiment, the sound emitting surface of the first ultrasonic transducer sub-array 30 and the sound emitting surface of the second ultrasonic transducer sub-array 40 are located within the same complete sound emitting surface, which transmits the ultrasonic waves forward. The complete sound production surface can be a plane, a curved surface or a complete sound production surface with any shape. Of course, in other embodiments, the sound emitting surface of the first ultrasound transducer sub-array 30 and the sound emitting surface of the second ultrasound transducer sub-array 40 may not be located on the same plane, and a front-back staggered arrangement is also applicable to the present invention.
Ultrasonic waves of different sounding frequency bands in the ultrasonic intersection region 10 are self-demodulated under the action of air to form difference frequency audible sound, and the difference frequency audible sound is located in the first difference frequency audible sound region 50. As shown in fig. 7, when no audio recipients or other obstructions are present within the ultrasonic junction region 10, the first difference frequency audible sound zone 50 is located within the ultrasonic junction region 10 and is smaller than the ultrasonic junction region 10. As shown in fig. 8, when there is an audio receiver in the ultrasound convergence region 10, due to a certain degree of reflection of the ultrasonic beam by the head or torso of the audio receiver, the ultrasound of different frequencies converges more, the first difference frequency audible sound region 50 increases slightly in all directions, but the first difference frequency audible sound region 50 is still located in the sound source radiation region 20, and the first difference frequency audible sound region 50 is still much smaller than the sound source radiation region 20 of the ultrasound transducer array 100 in all directions. Thus, a distinct first difference frequency audible sound can be heard when the audio recipient is within the first difference frequency audible sound zone 50 and cannot be heard when the audio recipient is outside the first difference frequency audible sound zone 50.
Above, for convenience of description, a person facing the ultrasonic transducer array 100 and located in the first difference frequency audible sound region 50 is defined as an audio receiver.
The first difference frequency audible sound formed by the ultrasonic transducer array 100 in this embodiment slightly decreases its sound pressure level due to partial intersection, and the propagation distance of the formed first difference frequency audible sound is shortened due to the decrease in the sound pressure level with the propagation distance, that is, the length of the first difference frequency audible sound region 50 in the propagation direction is decreased, so that the first difference frequency audible sound is prevented from continuing to propagate to the rear of the first difference frequency audible sound region 50. Therefore, the ultrasonic transducer array 100 is much smaller than a conventional parametric array speaker in the propagation direction, and the privacy requirement of directional sound can be effectively ensured. Generally, the first difference frequency audible sound region 50 is a directional sound region of higher privacy that is expected to need to be formed, i.e., the corresponding use region of the ultrasound transducer array 100.
In this embodiment, at least two ultrasound transducer sub-arrays are formed by dividing one ultrasound transducer array, and the interval between any two adjacent ultrasound transducer sub-arrays is not more than 0.2m. In this embodiment, the first ultrasonic transducer sub-array 30 and the second ultrasonic transducer sub-array 40 are formed by dividing the same ultrasonic transducer array, so that the minimum distance between any first ultrasonic transducer included in the first ultrasonic transducer sub-array 30 and any second ultrasonic transducer included in the second ultrasonic transducer sub-array 40 is not greater than 0.2m. Of course, on the premise of satisfying the minimum distance, the first ultrasonic transducer sub-array 30 and the second ultrasonic transducer sub-array 40 may also be independently disposed, and both of them are suitable for the present invention, for example, they belong to two different directional sound generating devices, etc. It is to be understood that the distance between the edge of the first ultrasound transducer sub-array 30 closest to the second ultrasound transducer sub-array 40 and the corresponding edge of the second ultrasound transducer sub-array 40 in this embodiment is actually the minimum distance.
The present embodiment does not limit the size of the acoustic transducer array 100. To ensure sound pressure levels and directivity within first difference frequency audible sound region 50, the width of ultrasonic transducer array 100 in the horizontal direction parallel to the ears of the respective audio recipients is no greater than 1.5m.
And, when the corresponding first difference frequency audible sound region 50 is formed in a customized manner, the distance between the central point of the connecting line formed by the two ears of the audio receiver and the sound emitting surface of the ultrasonic transducer array 100 should be ensured to be not more than 2m, so as to further ensure the sound pressure level and the directivity of the audible sound.
Therefore, the present embodiment can customize and adjust the structure of the ultrasound transducer array 100 according to the setting requirement (i.e. directional sound privacy setting requirement) of the first difference frequency audible sound region 50 (i.e. the usage region), and the adjusted parameters include, but are not limited to, the radiation angle and frequency f1 of the ultrasound wave of the first ultrasound transducer sub-array 30, the radiation angle and frequency f2 of the ultrasound wave of the second ultrasound transducer sub-array 40, the relative position relationship and spacing distance between the first ultrasound transducer sub-array 30 and the second ultrasound transducer sub-array 40, the distance between the first difference frequency audible sound region 50 and the sound emitting surface of the ultrasound transducer array 100, the width of the sound emitting surface of the ultrasound transducer array 100 in the horizontal direction, and so on.
In conclusion, the ultrasonic transducer array reduces the corresponding audible sound area through an optimized structure, realizes high audible sound directivity and shortens the propagation distance at the same time, thereby improving the privacy when the ultrasonic transducer array is applied; more importantly, even the presence of the voice recipient in the audible sound area does not destroy the privacy.
Example two
As shown in fig. 12, on the basis of the first embodiment, the present embodiment further provides an ultrasound transducer array 200, where the ultrasound transducer array 200 includes the first ultrasound transducer sub-array 30 and the second ultrasound transducer sub-array 40 in the first embodiment, and further includes a third ultrasound transducer sub-array 60. The sound emitting surface of the third ultrasonic transducer sub-array 60 is located on the same plane as the sound emitting surface of the first ultrasonic transducer sub-array 30 or the second ultrasonic transducer sub-array 40. The third ultrasound transducer sub-array 60 emits a third ultrasound beam of a third ultrasound frequency band.
In one embodiment, as shown in FIG. 12, a third ultrasonic transducer sub-array 60 is spaced from the first ultrasonic transducer sub-array 30, the third ultrasonic frequency band being different from the first ultrasonic frequency band. And the part of the first ultrasonic wave beams and the part of the third ultrasonic wave beams which are simultaneously etched meet in the propagation direction and are demodulated to generate second difference frequency audible sound. As shown in fig. 13, the first difference frequency audible sound and the second difference frequency audible sound are both located within a second difference frequency audible sound region 70, and the second difference frequency audible sound region 70 is located within the sound source radiating region 20 of the ultrasonic transducer array 200, i.e., the ultrasonic waves emitted by the ultrasonic transducer array 200 form a second difference frequency audible sound region 70 that is much smaller than the sound source radiating region 20. The spacing arrangement of the third ultrasonic transduction sub-array 60 and the first ultrasonic transducer sub-array 30 includes, but is not limited to, one of the arrangement of the third ultrasonic transduction sub-array 60 adjacent to the first ultrasonic transducer sub-array 30, the arrangement of the third ultrasonic transduction sub-array 60 around the periphery of the first ultrasonic transducer sub-array 30, and the like.
Therefore, in the present embodiment, the ultrasonic transducer array is divided into three or more ultrasonic transducer sub-arrays arranged at intervals to form a customized difference frequency audible region, and the formed difference frequency audible region has better directivity and short propagation distance, and has better privacy.
EXAMPLE III
The present embodiment provides a directional sound emission control method, which is applied to the ultrasound transducer array in the first embodiment or the second embodiment. The directional sounding control method comprises the following steps:
s1, one of the two adjacent ultrasonic transducer sub-arrays receives a first electric signal, and the other ultrasonic transducer sub-array receives a second electric signal.
The two adjacent ultrasound transducer sub-arrays are respectively the first ultrasound transducer sub-array and the second ultrasound transducer sub-array as described in the first embodiment, and the description of the ultrasound transducer arrays refers to the foregoing embodiments, which will not be repeated herein.
S2, one of the ultrasonic transducer sub-arrays emits a first ultrasonic beam under the action of the corresponding first electric signal, the other ultrasonic transducer sub-array emits a second ultrasonic beam under the action of the corresponding second electric signal, the first ultrasonic beam and the second ultrasonic beam are converged to form an ultrasonic intersection area, and ultrasonic waves of different sounding frequency bands in the ultrasonic intersection area are self-demodulated under the action of air to form difference frequency audible sound.
The first electrical signal or the second electrical signal may include an alternating current signal, or may include both an alternating current signal and a direct current signal. The specific process of converting the electrical signal into the ultrasonic signal by the ultrasonic transducer of the present embodiment is the same as that of the prior art, and will not be further described here.
Example four
The present embodiment further provides a directional sound production device, where the directional sound production device includes the ultrasonic transducer array in the first embodiment or the second embodiment, and is configured to execute the directional sound production control method in the third embodiment, and a difference frequency audible sound region formed by the directional sound production control method has higher directivity and short propagation distance, and can effectively improve sound production privacy in an application scene.
The directional sounding device is one of a single-sided directional sounding loudspeaker, a double-sided directional sounding loudspeaker, a single-sided directional sounding screen and a double-sided directional sounding screen. Illustratively, when the directional sound-emitting device is a double-sided directional sound-emitting screen, the directional sound-emitting device comprises a double-sided display screen and two ultrasonic transducer arrays respectively integrated on two opposite display surfaces of the double-sided display screen. The specific structure of the ultrasonic transducer array refers to the description in the first embodiment or the second embodiment.
The directional sound production device provided by the embodiment realizes directional sound production by integrating the ultrasonic transducer array in the existing device, and effectively realizes the privacy of sound production of the directional sound production device.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present invention, that is, any multiple embodiments may be combined to meet the requirements of different application scenarios, which are within the protection scope of the present application and are not described herein again.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ultrasonic transducer array is characterized in that the ultrasonic transducer array comprises at least two ultrasonic transducer sub-arrays which are arranged at intervals, sounding frequency bands of ultrasonic waves emitted by any two adjacent ultrasonic transducer sub-arrays are different, sounding areas of any two adjacent ultrasonic transducer sub-arrays are intersected to form an ultrasonic intersection area, the ultrasonic intersection area is located in the whole sound source radiation area of the ultrasonic transducer array, and the ultrasonic waves of different sounding frequency bands of the ultrasonic intersection area are self-demodulated under the action of air to form difference frequency audible sound.
2. The ultrasonic transducer array of claim 1, wherein the at least two ultrasonic transducer sub-arrays are formed by one ultrasonic transducer array division or are arranged independently.
3. The ultrasonic transducer array of claim 1, wherein the sound emitting surfaces of the at least two ultrasonic transducer sub-arrays are located in the same plane.
4. The ultrasonic transducer array of claim 1, wherein a spacing between any two adjacently disposed sub-arrays of the ultrasonic transducers is no greater than 0.2m.
5. The ultrasonic transducer array of claim 1, wherein the width of the ultrasonic transducer array in a horizontal direction parallel to the ears of a respective audio recipient is no greater than 1.5m.
6. The ultrasonic transducer array of claim 1, wherein a distance between a center point of a line formed by the ears of a respective audio receiver and a sound emitting surface of the ultrasonic transducer array is not more than 2m.
7. The ultrasonic transducer array according to any one of claims 1 to 6, wherein the at least two ultrasonic transducer sub-arrays are arranged regularly or irregularly.
8. The ultrasound transducer array of claim 7, wherein the at least two ultrasound transducer sub-arrays form a one-dimensional or two-dimensional array arrangement, or form a ring array arrangement.
9. A directional sound emission control method applied to the ultrasonic transducer array according to any one of claims 1 to 8, the method comprising:
one of the two adjacent ultrasonic transducer sub-arrays receives a first electric signal, and the other ultrasonic transducer sub-array receives a second electric signal;
one of the ultrasonic transducer sub-arrays emits a first ultrasonic beam under the action of the corresponding first electric signal, the other ultrasonic transducer sub-array emits a second ultrasonic beam under the action of the corresponding second electric signal, the first ultrasonic beam and the second ultrasonic beam are intersected and converged to form an ultrasonic intersection region, and ultrasonic waves in different sounding frequency bands of the ultrasonic intersection region are self-demodulated under the action of air to form difference frequency audible sound.
10. A directional sound production device, characterized in that the directional sound production device comprises an ultrasonic transducer array according to any one of claims 1 to 8.
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