Directional sound production system and method, and display terminal

Abstract

The present disclosure relates to the technical field of directional sound, and provides a directional sound production system. The system comprises: a sound modulation unit configured to load an audio signal onto a carrier to generate an ultrasonic electrical signal, the ultrasonic electrical signal carrying the audio signal; a power matrix distributor configured to distribute the ultrasonic electrical signal to a directional sound production unit; and the directional sound production unit comprising a plurality of ceramic oscillators arranged at intervals, wherein the plurality of ceramic oscillators are configured to send the audio signal in the ultrasonic electrical signal to a specified direction. According to the directional sound production system of the present disclosure, the directional sound production unit is formed by a plurality of ceramic oscillators arranged at intervals, so that the directional sound production unit not only meets the requirements for the area and thickness of an ultrasonic device, but also can meet the requirements of ultrasonic beam sound, thereby achieving an ideal effect.

Description

Directional sound generation system, method and display terminal Technical Field

[0001] The present disclosure belongs to the field of directional sound technology, and particularly relates to a directional sound generation system, method and display terminal. Background Art

[0002] Existing ultrasonic devices come in a variety of forms. For example, ultrasonic transducers are used in cleaning applications. They are large and offer high power output. Other ultrasonic transducers are used in B-ultrasound probes, where the substrate serves as a heat sink. Multiple ultrasonic units connected in parallel form a directional sound generator, commonly found in speakers.

[0003] Currently, using headphones to prevent unwanted sound is often uncomfortable. For normal use, if you don't want to disturb others and don't need headphones, there seems to be no better solution. Directional sound technology transmits sound through ultrasound, and the sound can be cut off with a piece of paper, eliminating the vibrations of traditional sound. If used on a TV, while the sound is playing in the living room, it remains silent in the bedroom, creating a do-not-disturb feature. However, due to space constraints on laptops, computers, and televisions, these devices cannot accommodate excessive thickness or bulk to implement directional sound. Creating an ultra-narrow module directional sound system for laptops, televisions, and other devices to achieve directional sound transmission has become a pressing issue.

[0004] Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. In a first aspect, an embodiment of the present disclosure provides a directional sound emission system, the system comprising:

[0006] a sound modulation unit configured to load an audio signal onto a carrier wave to generate an ultrasonic electric signal, wherein the ultrasonic electric signal carries the audio signal;

[0007] a power matrix distributor configured to distribute the ultrasonic electrical signal to the directional sound emitting units;

[0008] The directional sound emitting unit includes a plurality of ceramic vibrators arranged at intervals, and the plurality of ceramic vibrators are configured to transmit the audio signal in the ultrasonic electrical signal in a specified direction.

[0009] In some embodiments, a ratio of an area value to a thickness value of each of the ceramic vibrators is greater than 10.

[0010] In some embodiments, each of the ceramic vibrators is square in shape.

[0011] In some embodiments, the directional sound unit further includes a circuit board, the plurality of ceramic vibrators are disposed on the circuit board, and each of the ceramic vibrators is disposed at a certain angle to the plane of the circuit board.

[0012] In some embodiments, the directional sound unit further includes an isolation wall disposed on the circuit board and located between adjacent ceramic vibrators, and the isolation wall is configured to isolate audio signals between adjacent ceramic vibrators.

[0013] In some embodiments, the isolation wall is made of absorbing material.

[0014] In some embodiments, the system further comprises:

[0015] a carrier generator configured to generate a first carrier based on the beam;

[0016] The carrier shaper is configured to process the first carrier to obtain the carrier and output the carrier to the sound modulation unit.

[0017] In some embodiments, the system further comprises:

[0018] a carrier generator configured to generate a first intermediate carrier based on the beam;

[0019] a carrier shaper, configured to process the first intermediate carrier to obtain an intermediate carrier;

[0020] The carrier generator is further configured to receive the intermediate carrier generated by the carrier shaper and process the intermediate carrier to obtain a first carrier;

[0021] The carrier shaper is further configured to process the first carrier to obtain the carrier and output the carrier to the sound modulation unit.

[0022] In some embodiments, the system further comprises:

[0023] A power amplifier is configured to amplify the ultrasonic electrical signal generated by the sound modulation unit and transmit the amplified ultrasonic electrical signal to the power matrix distributor.

[0024] In some embodiments, the system further comprises:

[0025] A control unit is configured to set parameters of the directional sound emitting system and send the parameters to the sound modulation unit, the carrier shaper, the power amplifier and / or the power matrix distributor.

[0026] In some embodiments, the directional generating unit further includes a directional sound horn configured to transmit the audio signal in the ultrasonic electrical signal emitted by the plurality of ceramic vibrators to a specified direction.

[0027] In a second aspect, the present disclosure further provides a method for directional sound generation, the method comprising:

[0028] The audio signal is loaded onto a carrier wave through a sound modulation unit to generate an ultrasonic electric signal, wherein the ultrasonic electric signal carries the audio signal;

[0029] Distributing the ultrasonic electrical signal to the directional sound emitting unit through a power matrix distributor;

[0030] The audio signal in the ultrasonic electrical signal is transmitted in a specified direction through a plurality of ceramic vibrators arranged at intervals in the directional sound-emitting unit.

[0031] In some embodiments, the method further comprises: generating, by a carrier generator, a first carrier based on the beam;

[0032] The first carrier is processed by a carrier shaper to obtain the carrier and output it to the sound modulation unit.

[0033] In some embodiments, the processing of the first carrier by a carrier shaper to obtain the carrier and outputting the carrier to the sound modulation unit includes:

[0034] In response to the carrier not satisfying a preset condition, using the carrier as the beam and repeatedly performing:

[0035] generating, by a carrier generator, a first carrier based on the beam;

[0036] The first carrier is processed by a carrier shaper to obtain the carrier until the carrier satisfies the preset condition, and the carrier is output to the sound modulation unit.

[0037] In some embodiments, the method further comprises:

[0038] The ultrasonic electrical signal is amplified by a power amplifier and transmitted to the power matrix distributor.

[0039] In a third aspect, an embodiment of the present disclosure further provides a display terminal, which includes any directional sound emission system provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a structural diagram of a directional sound generation system 100 provided in an embodiment of the present disclosure;

[0041] FIG2 is a schematic diagram of the non-configurable shapes and vibration modes according to an embodiment of the present disclosure;

[0042] FIG3 is a schematic diagram of areas of different shapes in the same space according to an embodiment of the present disclosure;

[0043] FIG4 is a structural diagram of another directional sound emission system 400 provided in an embodiment of the present application;

[0044] FIG5 is a flow chart of a method for directional sound generation provided by an embodiment of the present disclosure;

[0045] FIG6 is a schematic diagram of a display terminal 600 according to an embodiment of the present disclosure;

[0046] FIG7A is a schematic diagram of a ceramic resonator arranged parallel to the plane of a circuit board according to an embodiment of the present disclosure;

[0047] FIG7B is a schematic diagram of a ceramic vibrator arranged at a certain angle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0049] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0050] Directional sound generation is achieved through ultrasonic technology, which modulates the sound signal and attaches it to a carrier wave of more than 20K, and sends it out through an ultrasonic transmitter. Because ultrasonic waves have direct propagation properties and carry sound signals, when they are sent to the human ear, the eardrum will resonate, so that the person facing this ultrasonic wave can hear the sound attached to the carrier wave.

[0051] Directional sound transmission technology is widely used in people's daily lives. For example, in the scene shown in the exhibition hall, the sounds emitted by different booths can only be heard by those who visit the booth in person, eliminating the noise in the entire exhibition hall. This technology is also useful when withdrawing money from a bank counter. The prompts from bank equipment or the conversations at the counter can be transmitted to specific users, while users in other areas cannot hear them, thus largely preventing user information leakage. School playgrounds can also be equipped with directional speakers, so that playground broadcasts are transmitted only within the specific playground area, without causing noise interference to nearby residential and teaching buildings, thereby ensuring that the rest of the nearby residents and normal teaching are not affected.

[0052] Due to the directional propagation characteristics of ultrasound, even nearby people cannot hear the sound. This directional sound technology boasts a directional sound transmission pattern, a small transmission angle, and long-distance transmission. However, when using ultrasonic directional sound in display terminals such as computers and monitors, a single ultrasonic device is relatively large. If the size is reduced, the transmission power will be insufficient. Increasing the power and voltage of a single device would increase costs and power consumption. Furthermore, due to the directional nature of ultrasonic transmission, people must remain stationary. Beyond a certain angle, the sound cannot be heard, limiting the audible range. Furthermore, the frequency of directional sound transmission is related to the thickness and area of ​​the ultrasonic device. As the thickness decreases, the area also needs to decrease at this frequency, which in turn reduces power consumption. Therefore, a balance must be struck between the area and thickness of the ultrasonic device to achieve optimal sound transmission.

[0053] Figure 1 is a structural diagram of a directional sound emission system 100 provided in an embodiment of the present disclosure. The system 100 can be used in display terminal systems such as televisions and computers, and can also be used in other small-volume devices. As shown in Figure 1, the system 100 includes a sound modulation unit 101, a power matrix distributor 102, and a directional sound emission unit 103. The sound modulation unit 101 is configured to load an audio signal onto a carrier to generate an ultrasonic electrical signal, which carries an audio signal. The power matrix distributor 102 is configured to distribute the ultrasonic electrical signal to the directional sound emission unit 103. The directional sound emission unit 103 includes a plurality of ceramic vibrators arranged at intervals, and the plurality of ceramic vibrators are configured to send the audio signal in the ultrasonic electrical signal to a specified direction.

[0054] Among them, the ceramic vibrator is an electronic device composed of an electroceramic material. This electroceramic material has a piezoelectric effect, that is, when a voltage is applied to the two ends of the ceramic vibrator, it will vibrate. The root cause of the piezoelectric effect is the displacement of ionic charges in the crystal. When there is no strain, the charges are distributed symmetrically on the lattice position, so its internal electric field is zero. However, when stress is applied to the crystal, the charges are displaced. If the charge distribution is no longer symmetrical, net polarization will occur, and an electric field will be generated. This electric field manifests as a piezoelectric effect. Piezoelectric ceramics are ferroelectric ceramic materials with a piezoelectric effect. When the crystal is stimulated by an external electric field, it will deform, and there is a linear relationship between the two. This process of converting the electrical effect into a mechanical effect is called the inverse piezoelectric effect, that is, the process of deformation after applying a voltage. Optionally, the electroceramic material can be a quartz crystal or other material that can produce a piezoelectric effect. This is not limited in the embodiments of the present disclosure. In addition, the ceramic vibrator can send ultrasonic electrical signals carrying sound signals in a specified direction, and when the ultrasonic electrical signals carried by the ceramic vibrator encounter an obstacle (such as a wall or a piece of paper, etc.), the sound will be reflected back. Therefore, the use of ceramic vibrators as directional sound-emitting units in the embodiments of the present disclosure can not only send audio signals in a specified direction, but also send them to a specified range.

[0055] Since there is no need to output very high-energy ultrasonic waves in the field of directional sound, the area and thickness of ultrasonic devices are required to be as small as possible. However, the applicant found that the sound of an ultrasonic beam with appropriate energy is too small. In the directional sound system of the embodiment disclosed herein, the directional sound unit 103 is composed of multiple ceramic vibrators arranged at intervals. Since there are multiple ceramic vibrators, and each ceramic vibrator can load an ultrasonic electrical signal and send the ultrasonic electrical signal in a specified direction. Therefore, the area and thickness of a single ceramic vibrator can meet the requirements for the area and thickness of ultrasonic devices in the field of directional sound, and multiple ceramic vibrators can simultaneously load ultrasonic electrical signals and send ultrasonic electrical signals in a specified direction, which can meet the requirements for ultrasonic beam sound, and can achieve the ideal effect.

[0056] For example, in directional sound generation system 100, after receiving an audio signal from, for example, a computer or television, sound modulation unit 101 uses ultrasonic technology to transfer the sound onto a carrier wave of a specific frequency, generating an ultrasonic electrical signal. The specific carrier wave frequency can be 20 kHz. The power matrix distributor 102 then distributes this ultrasonic electrical signal carrying the audio signal to the multiple ceramic resonators of directional sound generation unit 103. Each ceramic resonator then transmits the audio signal contained in the transferred ultrasonic electrical signal in a designated direction.

[0057] In some examples, the spacing between adjacent ceramic vibrators and the number of ceramic vibrators can be set according to specific circumstances. For example, the number of ceramic vibrators is set based on the area and volume of the directional sound unit 103. The distance between ceramic vibrators also affects the number of ceramic vibrators. In practical applications, the number and distance of ceramic vibrators can be balanced in combination with the energy of the ultrasonic wave. In some embodiments, the ratio of the area value to the thickness value of each ceramic vibrator is greater than 10. The larger the ratio of the area value to the thickness of the ceramic vibrator, the better. At the same resonant frequency, the larger the area of ​​the ceramic vibrator, the thinner its thickness can be made. However, due to the size limitations of the display terminal, the directional sound emission system cannot be made too large, that is, the area of ​​the ceramic vibrator cannot be increased indefinitely. Therefore, it is necessary to balance the area and thickness of the ceramic vibrator. Setting the ratio of the area value to the thickness value of the ceramic vibrator to greater than 10 based on the main energy parameters of the ceramic vibrator (such as the material parameters such as the electromechanical coupling coefficient, the mechanical quality factor, the piezoelectric constant, etc.) can effectively balance the area and thickness of the ceramic vibrator.

[0058] Specifically, ceramic resonators have a piezoelectric effect, which occurs when an ultrasonic electrical signal is applied to the ceramic resonator. Factors influencing the piezoelectric effect include the piezoelectric constant, which is the linear response coefficient of the mutual coupling between stress and electric field. When compressive stress T3 is applied along the polarization direction of the ceramic resonator (for example, the z-axis), an electric charge is generated on the electrode surface. Conversely, when a corresponding voltage is applied to both ends of the polarization, a corresponding stress change will also occur. The following relationship is expressed:

[0059] D3 = d33 × T3, where d33 is the piezoelectric constant, T3 is the pressure, and D3 is the electric displacement. This formula reflects the relationship between stress (T) and voltage displacement (D).

[0060] In addition, the electromechanical coupling coefficient K is a material quantity that comprehensively reflects the coupling relationship between the mechanical energy and electrical energy of the ceramic resonator. It is a parameter of the ceramic resonator's ability to convert electromechanical energy into electrical energy. It is defined as:

[0061] K2 = electrical energy converted through the direct piezoelectric effect / total mechanical energy input during conversion.

[0062] Secondly, the mechanical energy of a ceramic vibrator is related to its shape and vibration mode. Figure 2 is a schematic diagram of different shapes and vibration modes in the embodiment of the present disclosure. As shown in Figure 2, different shapes of ceramic vibrators affect their vibration mode, which in turn affects the directional sound effect of the ceramic vibrator.

[0063] Another factor influencing the piezoelectric effect is the mechanical quality factor (Qm). When a ceramic resonator vibrates, it consumes energy to overcome internal friction. The mechanical quality factor reflects the amount of energy consumed; the larger the Qm, the lower the energy consumption.

[0064] Another factor influencing the piezoelectric effect is the frequency constant, N. For a given ceramic resonator, the product of its resonant frequency and its length in the direction of vibration is a constant: N = fr × 1, where fr is the resonant frequency and 1 is the length of the resonator in the direction of vibration. For example, for radial vibration of a thin disk: Np = fr × D (D is the disk's diameter); for thickness expansion vibration of a thin plate: Nt = fr × t (t is the plate's thickness).

[0065] In the embodiment of the present disclosure, based on the material parameters Kp, Qm, and D33, it is determined that the radial vibration mode of the ceramic vibrator needs to be adopted, and the ratio of the area value to the thickness value of the ceramic vibrator is required to be as large as possible. Generally, the ratio of the area value to the thickness value of the ceramic vibrator is greater than 10, the polarization direction is parallel to the thickness direction, and the electrode surface is perpendicular to the thickness direction.

[0066] In some embodiments, the shape of the ceramic vibrator includes but is not limited to a square. Figure 3 is a schematic diagram of the areas of different shapes in the same space in an embodiment of the present disclosure. As shown in Figure 3, in the same space, the area of ​​circle 2 is always less than the area of ​​square 1. Considering that the waste generated by the square and rectangular areas in the cutting of ceramic vibrator materials is the smallest, and the processing technology is relatively simple. Therefore, in the selection of the shape of the ceramic vibrator, on the one hand, it is considered that at the same resonant frequency, the larger the area, the thinner its thickness can be made. On the other hand, in terms of processing technology and material waste, the square design is superior to other forms. Therefore, this ceramic vibrator adopts a square design.

[0067] In some embodiments, the directional sound unit 103 includes not only a plurality of ceramic vibrators spaced apart from each other, but also a circuit board on which the plurality of ceramic vibrators are mounted. The circuit board serves as a support for the ceramic vibrators and a carrier for interconnecting the ceramic vibrators. The circuit board can generally be a printed circuit board (PCB), but can also be other circuit boards.

[0068] In some embodiments, since the multiple ceramic vibrators of the directional sound unit 103 are arranged on the circuit board and are arranged parallel to the plane of the circuit board. At this time, the ceramic vibrator sends the audio signal in the ultrasonic electrical signal in a specified direction along the direction in which the ceramic vibrator is away from the circuit board. Therefore, this setting makes all the ceramic vibrators send audio signals in one direction (i.e., the direction in which the ceramic vibrator is away from the circuit board or the direction perpendicular to the plane of the circuit board), so that the audio signal in the ultrasonic electrical signal is all directed in one direction (i.e., the direction in which the ceramic vibrator is away from the circuit board or the direction perpendicular to the plane of the circuit board). This design can be applied to scenarios where sound is propagated in a single directional direction, such as in a bank counter withdrawal scenario, the prompt voice of the bank device or the conversation content of the counter only needs to be directed to a specific user, and users in other directions, even users next to the specific user, cannot hear the sound, which can largely avoid the leakage of user information.

[0069] In some embodiments, the multiple ceramic vibrators of the directional sound unit 103 are arranged on a circuit board, and each ceramic vibrator is arranged at a certain angle to the plane of the circuit board. Because the ceramic vibrator sends the audio signal in the ultrasonic electrical signal to a specified direction along the direction in which the ceramic vibrator is away from the circuit board. Therefore, when the ceramic vibrator is set at a certain angle to the plane of the circuit board, the direction of the ceramic vibrator away from the circuit board can be directed to various directions as needed, and the ceramic vibrator can send the audio signal in the ultrasonic electrical signal to various specified directions as needed. It can be understood that the multiple ceramic vibrators can have the same angle with the plane of the circuit board as needed, that is, each ceramic vibrator bends in the same direction, or each ceramic vibrator can have a different angle with the plane of the circuit board, that is, each ceramic vibrator bends in a different direction, or partially the same, and this application does not limit this. This design can be used in scenarios where sound is propagated in multiple directional directions. For example, in the directional speakers installed on school playgrounds, the playground broadcast sound needs to be heard not only by a specific person, but by everyone on the playground. In the directional speakers used on school playgrounds, the multiple ceramic vibrators in the directional sound-emitting units used can be at different angles to the plane of the circuit board, so that the front of each ceramic vibrator faces a different direction, and the directional sound can be transmitted in multiple directions, reaching a wider audience and meeting user needs.

[0070] In some embodiments, the directional sound emitting unit 103 includes not only a plurality of ceramic vibrators and a circuit board disposed at intervals, with the plurality of ceramic vibrators disposed on the circuit board, but also a separation wall disposed on the circuit board and located between adjacent ceramic vibrators, wherein the separation wall is configured to isolate the audio signals between adjacent ceramic vibrators. Specifically, the frequency of the ultrasonic electrical signal received by each ceramic vibrator is the same. Therefore, when the ceramic vibrators emit sound, in order to prevent crosstalk and resonance between the ceramic vibrators, the embodiments of the present disclosure isolate the audio signals between adjacent ceramic vibrators by disposing a separation wall between the ceramic vibrators, thereby achieving better directionality and isolation between each ceramic vibrator.

[0071] In some embodiments, the isolation wall is made of an absorbing material. Specifically, the absorbing material is disposed between adjacent ceramic vibrators to absorb ultrasonic energy around the ceramic vibrators and only transmit ultrasonic electrical signals in the front of the ceramic vibrators in a directional manner, thereby achieving directional propagation of sound.

[0072] Figure 7A is a schematic diagram of a ceramic vibrator arranged parallel to the plane of a circuit board according to an embodiment of the present disclosure, and Figure 7B is a schematic diagram of a ceramic vibrator arranged at a certain angle according to an embodiment of the present disclosure. Reference numeral 701 represents a separation wall, and reference numeral 702 represents a ceramic vibrator. In Figure 7A , the orthographic projection of each ceramic vibrator and the separation wall between them onto the plane of the circuit board is parallel to the plane of the circuit board. In Figure 7B , each ceramic vibrator and the separation wall between them are arranged at a certain angle to the plane of the circuit board.

[0073] FIG4 is a structural diagram of another directional sound emission system 400 provided in an embodiment of the present application. As shown in FIG4, compared with the system 100 shown in FIG1, the system 400 includes a sound modulation unit 101, a power matrix distributor 102, and a directional sound emission unit 103, and further includes a carrier generator 401 and a carrier shaper 402.

[0074] The carrier generator 401 is configured to generate a first carrier based on the beam. The carrier shaper 402 is configured to process the first carrier, obtain a carrier, and output the carrier to the sound modulation unit 101 .

[0075] Specifically, carrier generator 401 incorporates a beam shaping circuit within a positive feedback circuit to generate an ultrasonic signal with a fixed frequency for modulation of sound modulation unit 101. Because the waveform generated by carrier generator 401 varies with device temperature, carrier shaper 402 mitigates the effects of the external environment, thereby ensuring a more stable output carrier.

[0076] In some embodiments, the carrier generator 401 is configured to generate a first intermediate carrier based on beamforming. The carrier shaper 402 is configured to process the first intermediate carrier to obtain an intermediate carrier. The carrier generator 401 is then further configured to receive the intermediate carrier generated by the carrier shaper 402 and process the intermediate carrier to obtain a first carrier. The carrier shaper 402 is further configured to process the first carrier to obtain a carrier wave, which is then output to the sound modulation unit 101. In other words, the carrier shaper 402 can also provide negative feedback to the carrier generator 401. If the intermediate carrier wave output by the carrier shaper 402 does not meet preset conditions, the intermediate carrier wave is resent to the carrier generator 401 for processing and then processed again by the carrier shaper 402. Only when the carrier wave output by the carrier shaper meets the preset conditions is the carrier wave sent to the sound modulation unit 101 for further processing. This directional sound generation system including negative feedback can make the carrier wave entering the sound modulation unit 101 more stable and more satisfactory.

[0077] In some embodiments, the system 400 includes not only the sound modulation unit 101, the power matrix distributor 102, the directional sound unit 103, the carrier generator 401, and the carrier shaper 402, but also a power amplifier 403. The power amplifier 403 is configured to amplify the ultrasonic electrical signal generated by the sound modulation unit 101 and transmit it to the power matrix distributor 102. Specifically, the power amplifier 403 is used to further strengthen the ultrasonic signal and increase the driving capability.

[0078] In some embodiments, the system 400 not only includes a sound modulation unit 101, a power matrix distributor 102, a directional sound emission unit 103, a carrier generator 401 and a carrier shaper 402, and a power amplifier 403, but also includes a control unit 404. The control unit 404 is configured to set the parameters of the directional sound emission system and send the parameters to the sound modulation unit 101, the carrier shaper 402, the power amplifier 403 and / or the power matrix distributor 102.

[0079] In some embodiments, the directional generating unit 103 not only includes a plurality of ceramic vibrators arranged at intervals, a circuit board, and a partition wall arranged on the circuit board and located between adjacent ceramic vibrators, but also includes a directional sound horn, which is configured to send the audio signal in the ultrasonic electrical signal emitted by the plurality of ceramic vibrators in a specified direction.

[0080] The directional sound emission system in the embodiment of the present disclosure, on the one hand, by arranging multiple ceramic vibrators at intervals in the directional generating unit, can meet the requirements of minimizing the area and thickness of the ceramic vibrator design while meeting the requirements of high-energy ultrasonic waves. On the other hand, the shape of the ceramic vibrator is chosen to be square, considering that at the same resonant frequency, the larger the area, the thinner its thickness can be. At the same time, the square design is superior to other forms in terms of processing technology and material consumption. On the other hand, the isolation wall is set between adjacent ceramic vibrators to prevent crosstalk between the ceramic vibrators. On the other hand, multiple ceramic vibrators are set on the circuit board and are set at a certain angle to the plane of the circuit board, which can make the directional sound propagate in all directions and reach a wider audience. The directional sound emission system in the embodiment of the present disclosure can meet the needs of display devices such as televisions and computers. The directional sound emission system can be set at the edge position of the display terminal, for example, it can be set at one or more of the four corners of the display terminal, or it can be set at other positions of the display terminal, and the present disclosure does not limit this.

[0081] FIG5 is a flow chart of a method for directional sound generation provided by an embodiment of the present disclosure, which can be applied to the above-mentioned directional sound generation system. As shown in FIG5 , the method includes:

[0082] S501: Loading an audio signal onto a carrier through a sound modulation unit to generate an ultrasonic electrical signal, wherein the ultrasonic electrical signal carries the audio signal.

[0083] S502: Distribute the ultrasonic electrical signal to the directional sound emitting unit through a power matrix distributor.

[0084] S503: The audio signal in the ultrasonic electrical signal is transmitted in a designated direction through a plurality of ceramic vibrators arranged at intervals in the directional sound-emitting unit.

[0085] Specifically, the ratio of the area value to the thickness value of each ceramic vibrator in the directional sound emitting unit in the embodiment of the present disclosure is greater than 10.

[0086] In some embodiments, the shape of the ceramic vibrator is a square. The ceramic vibrator can be the ceramic vibrator in the above embodiment, so it will not be repeated here.

[0087] In some embodiments, the plurality of ceramic vibrators are disposed on a circuit board and parallel to the plane of the circuit board. The ceramic vibrators transmit the audio signal in the ultrasonic electrical signal in a specified direction along a direction in which the ceramic vibrators are away from the circuit board. Therefore, this arrangement causes all the ceramic vibrators to transmit the audio signal in one direction (i.e., the direction in which the ceramic vibrators are away from the circuit board or a direction perpendicular to the plane of the circuit board), so that the audio signal in the ultrasonic electrical signal is directionally propagated in one direction (i.e., the direction in which the ceramic vibrators are away from the circuit board or a direction perpendicular to the plane of the circuit board).

[0088] In some embodiments, the plurality of ceramic vibrators are disposed on a circuit board, and each ceramic vibrator is disposed at a certain angle to the plane of the circuit board. When the ceramic vibrator is disposed at a certain angle to the plane of the circuit board, the ceramic vibrator can face away from the circuit board in various directions as needed, and the ceramic vibrator can transmit the audio signal in the ultrasonic electrical signal in various specified directions as needed.

[0089] In some embodiments, the directional sound generation method further includes: generating a first carrier wave based on a beamform using a carrier generator, processing the first carrier wave using a carrier shaper to obtain a carrier wave, and outputting the carrier wave to a sound modulation unit. Specifically, the carrier wave generator generates the first carrier wave based on a beamform to produce an ultrasonic signal with a fixed frequency for modulation by the sound modulation unit. Furthermore, the carrier shaper is used because the waveform generated by the carrier wave generator varies with increasing device temperature. Using a carrier shaper can reduce the influence of external environmental factors, thereby making the output carrier wave more stable.

[0090] In some embodiments, processing the first carrier by a carrier shaper to obtain a carrier and outputting the carrier to the sound modulation unit includes: in response to the carrier not meeting a preset condition, using the carrier as a beam and repeatedly performing:

[0091] A carrier generator generates a first carrier based on the beam; a carrier shaper processes the first carrier to obtain a carrier wave, which is then output to the sound modulation unit until it meets preset conditions. In other words, the carrier shaper can also provide negative feedback to the first carrier wave generated by the carrier generator. If the carrier wave output by the carrier shaper does not meet the preset conditions, it will be processed again by the carrier generator and then by the carrier shaper again until the carrier wave output by the carrier shaper meets the preset conditions. Only then will the carrier wave be sent to the sound modulation unit for further processing. This directional sound generation method including negative feedback can make the carrier wave entering the sound modulation unit more stable and more satisfactory.

[0092] In some embodiments, the directional sound generation method further includes: amplifying the ultrasonic electrical signal by a power amplifier and transmitting the amplified ultrasonic electrical signal to a power matrix distributor. Specifically, the power amplifier is used to further strengthen the ultrasonic signal and increase the driving capability.

[0093] The directional sound generation method disclosed in the embodiments of the present disclosure utilizes a directional sound generation unit equipped with multiple ceramic vibrators to propagate sound in a specific direction. Furthermore, negative feedback is applied to the carrier wave generated by the carrier shaper through a carrier generator, making the resulting carrier wave more stable and more compliant with requirements. This, in turn, enhances the directional sound generation effect achieved by the directional sound generation unit.

[0094] The present disclosure also provides a display terminal including any of the directional sound emission systems described in the above embodiments. The display terminal includes devices such as televisions, computers, and monitors. The directional sound emission system can be installed at an edge of the display terminal, for example, at one or more of the four corners of the display terminal, or at other locations within the display terminal, without limitation in the present disclosure.

[0095] FIG6 is a schematic diagram of a display terminal 600 according to an embodiment of the present disclosure. As shown in the figure, a directional sound emitting system 601 is disposed at each of the four corners of the display terminal 600. A directional sound speaker is disposed on the outermost portion of the directional sound emitting system 601. A directional sound emitting unit is disposed within the directional sound speaker. The directional sound emitting unit includes a plurality of ceramic vibrators disposed at intervals. The ultrasonic electrical signals emitted by the plurality of ceramic vibrators are transmitted through the directional sound speaker, which transmits the audio signal contained in the ultrasonic electrical signals in a specified direction. It is understood that the directional sound emitting system 601 may also include at least portions of a control unit, a sound modulation unit, a carrier shaper, a carrier generator, a power amplifier, and / or a power matrix distributor, all of which are disposed within the directional sound speaker.

[0096] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A directional sound generation system, characterized in that: The system comprises: A sound modulation unit, configured to load the audio signal onto a carrier wave to generate an ultrasonic electric signal, wherein the ultrasonic electric signal carries the audio signal; A power matrix distributor, configured to distribute the ultrasonic electrical signal to the directional sound-emitting unit; The directional sound-emitting unit includes a plurality of ceramic vibrators arranged at intervals, and the plurality of ceramic vibrators are configured to send the audio signal in the ultrasonic electrical signal to a specified direction.

2. The system according to claim 1, characterized in that The ratio of the area value to the thickness value of each ceramic vibrator is greater than 10.

3. The system according to claim 2, characterized in that Each of the ceramic vibrators is in a square shape.

4. The system according to claim 1, characterized in that The directional sound unit further comprises a circuit board, the plurality of ceramic vibrators are arranged on the circuit board, and each of the ceramic vibrators is arranged at a certain angle to the plane of the circuit board.

5. The system according to claim 4, characterized in that The directional sound unit further includes a separation wall disposed on the circuit board and located between adjacent ceramic vibrators, wherein the separation wall is configured to isolate audio signals between adjacent ceramic vibrators.

6. The system according to claim 5, characterized in that The isolation wall is made of wave-absorbing material.

7. The system according to claim 1, characterized in that The system further comprises: a carrier generator configured to generate a first carrier based on the beam; The carrier shaper is configured to process the first carrier to obtain the carrier and output it to the sound modulation unit.

8. The system according to claim 1, characterized in that The system further comprises: a carrier generator configured to generate a first intermediate carrier based on the beam; a carrier shaper, configured to process the first intermediate carrier to obtain an intermediate carrier; The carrier generator is further configured to receive the intermediate carrier generated by the carrier shaper and The intermediate carrier is processed to obtain a first carrier; The carrier shaper is further configured to process the first carrier to obtain the carrier and output the carrier to the sound modulation unit.

9. The system according to claim 1, characterized in that The system further comprises: The power amplifier is configured to amplify the ultrasonic electrical signal generated by the sound modulation unit and transmit it to the power matrix distributor.

10. The system according to claim 1, characterized in that The system further comprises: A control unit is configured to set parameters of the directional sound emitting system and send the parameters to the sound modulation unit, the carrier shaper, the power amplifier and / or the power matrix distributor.

11. The system according to claim 1, characterized in that The directional generating unit further includes a directional sound horn configured to send the audio signal in the ultrasonic electrical signal emitted by the plurality of ceramic vibrators to a specified direction.

12. A method for directional sound generation, characterized in that: The method comprises: The audio signal is loaded onto a carrier wave through a sound modulation unit to generate an ultrasonic electric signal, wherein the ultrasonic electric signal carries the audio signal; Distributing the ultrasonic electrical signal to the directional sound-emitting unit through a power matrix distributor; The audio signal in the ultrasonic electrical signal is sent to a specified direction through a plurality of ceramic vibrators arranged at intervals in the directional sound-emitting unit.

13. The method according to claim 12, characterized in that The method further includes: generating, by a carrier generator, a first carrier based on the beam; The first carrier is processed by a carrier shaper to obtain the carrier and output it to the sound modulation unit.

14. The method according to claim 13, characterized in that The method of processing the first carrier wave by a carrier shaper to obtain the carrier wave and outputting the carrier wave to the sound modulation unit includes: In response to the carrier not satisfying a preset condition, taking the carrier as the beam, and repeatedly performing: generating, by a carrier generator, a first carrier based on the beam; The first carrier is processed by a carrier shaper to obtain the carrier until the carrier meets the preset condition, and the carrier is output to the sound modulation unit.

15. The method according to claim 12, characterized in that The method further comprises: The ultrasonic electrical signal is amplified by a power amplifier and transmitted to the power matrix distributor.

16. A display terminal, characterized in that: The display terminal comprises the directional sound emitting system as claimed in any one of claims 1-11.

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