CN218336018U

CN218336018U - Directional loudspeaker's power amplifier box and directional loudspeaker

Info

Publication number: CN218336018U
Application number: CN202222344620.XU
Authority: CN
Inventors: 刘强; 汪培
Original assignee: Suzhou Hear Acoustic Technology Ltd
Current assignee: Suzhou Hear Acoustic Technology Ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-01-17
Anticipated expiration: 2032-09-02

Abstract

The utility model discloses a directional loudspeaker's power amplifier box and directional loudspeaker, including shell subassembly and power amplifier board subassembly. The power amplifier board assembly comprises a power amplifier board connected with the shell assembly and at least two different types of audio input interfaces connected with the power amplifier board. Through set up two kinds of different kinds of audio input interfaces on the power amplifier board for directional loudspeaker's power amplifier box can use two kinds of audio frequency lines to transmit audio signal, and audio input mode is more various like this, and it is convenient to use, can satisfy multiple user demand.

Description

Directional loudspeaker's power amplifier box and directional loudspeaker

Technical Field

The utility model relates to a directional sound production technical field especially relates to a directional loudspeaker's power amplifier box and directional loudspeaker.

Background

The sound emitted by a common loudspeaker is transmitted in all directions, and the diameter of the loudspeaker must be very large to realize directional sound emission. Different from the principle of a common loudspeaker, the directional loudspeaker utilizes the nonlinear propagation effect of ultrasonic waves in the air to generate high-directivity audible sound, the audio signals of the directional loudspeaker are processed to form ultrasonic signals containing the audio signal information, and then the ultrasonic waves are transmitted to the air by means of a sound generating device (namely a transducer) of the directional loudspeaker driven by a power amplifier circuit. The audio signal is self-demodulated by means of the nonlinear self-demodulation characteristic generated by the transmission of ultrasonic waves in the air, and an audible sound signal with strong directivity is formed.

The existing directional loudspeaker generally comprises a power amplifier box of the directional loudspeaker and an ultrasonic transducer connected with the power amplifier box of the directional loudspeaker, in the prior art, only one audio input interface, generally a 3.5mm audio interface, is arranged on the power amplifier box of the directional loudspeaker, so the audio input mode is single, and the use is not convenient enough, in addition, a part for realizing the power amplification function on a power amplifier board in the power amplifier box of the existing directional loudspeaker is formed by constructing a plurality of circuits, for example, fig. 8 shows a schematic diagram of a circuit module on the power amplifier board in the prior art, and the schematic diagram has a plurality of circuit units, a plurality of electronic components, a complex circuit and a low integration level.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a directional loudspeaker's power amplifier box and directional loudspeaker, this directional loudspeaker's power amplifier box's audio input mode is more various.

In order to realize the above-mentioned utility model purpose, on the one hand, the utility model provides a directional loudspeaker's power amplifier box, include:

a housing assembly; and the number of the first and second groups,

the power amplifier board assembly comprises a power amplifier board connected with the shell assembly and at least two different types of audio input interfaces connected with the power amplifier board.

Further, the power amplifier board assembly includes a first audio input interface and a second audio input interface, where the first audio input interface is a USB interface, and the second audio input interface is an analog audio interface.

Further, the second audio input interface is an XLR interface, a TRS interface, an RCA interface, or an AUX interface.

Furthermore, the power amplifier board assembly further comprises a power supply unit, a control unit, a data processing unit, a power amplifier unit and a decoding unit, which are arranged on the power amplifier board, the second audio input interface, the control unit, the power amplifier unit and the decoding unit are all in communication connection with the data processing unit, the decoding unit is connected between the first audio input interface and the data processing unit, and the data processing unit is used for modulating audio signals input by the decoding unit and the second audio input interface with ultrasonic carrier signals.

Furthermore, the power amplifier board assembly further comprises an audio output interface arranged on the power amplifier board, and the audio output interface is connected with the power amplifier unit.

Furthermore, the power amplifier board assembly further comprises a power interface arranged on the power amplifier board, and the power interface is connected with the power unit.

Furthermore, the power amplifier board assembly further comprises at least one human-computer interaction component, and the human-computer interaction component is used for realizing one or more functions of controlling the power amplifier box of the directional loudspeaker to be turned on and turned off, adjusting the volume of the power amplifier box of the directional loudspeaker and modifying the parameters of the power amplifier box of the directional loudspeaker.

Further, the shell subassembly include the casing and with the casing down that the casing links to each other on going up, it includes the roof to go up the casing, down the casing include towards front panel and locating part that the roof extends, front panel with the locating part along the preceding back direction interval of directional loudspeaker's power amplifier box sets up, front panel with the locating part all with the roof butt.

Further, the top of the front panel is provided with a plate portion bent towards the inside of the shell component, and the plate portion is attached to the top plate.

Further, the power amplifier board assembly further comprises a radiator connected with the power amplifier board, and the upper shell is provided with heat dissipation holes.

On the other hand, the utility model provides a directional loudspeaker, include as above arbitrary directional loudspeaker's power amplifier box.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. through set up two kinds of audio input interfaces of different types on the power amplifier board for directional loudspeaker's power amplifier box can use two kinds of audio line transmission audio signal, and audio input mode is more various like this, and it is convenient to use, can satisfy multiple user demand. Particularly, when one of the audio input interfaces is a USB interface, a USB data line can be used to transmit signals, so that the audio input interface is conveniently connected with mobile terminals such as mobile phones, and the audio input interface is more convenient to use.

2. As the improvement, the power amplifier board assembly comprises a power supply unit, a control unit, a data processing unit, a power amplifier unit and a decoding unit which are arranged on the power amplifier board, wherein the data processing unit is used for modulating audio signals input by a first audio input interface and a second audio input interface with ultrasonic carrier signals, generating ultrasonic modulation signals and then outputting the ultrasonic modulation signals to the power amplifier unit, the power amplifier board assembly directly adopts one power amplifier unit to replace and realize a plurality of circuits for realizing the power amplification function on the power amplifier board in the prior art, the integration level is higher, and the circuit realization is simpler.

Drawings

Fig. 1 is a schematic perspective view of a power amplifier box of a directional speaker according to an embodiment of the present invention;

fig. 2 is an exploded view of the power amplifier box of the directional loudspeaker shown in fig. 1;

fig. 3 is a schematic perspective view of a power amplifier board assembly of the power amplifier box of the directional speaker shown in fig. 1;

fig. 4 is a block diagram of a power amplifier board assembly according to an embodiment of the present invention;

fig. 5 is a perspective view of the upper housing of the power amplifier box of the directional speaker shown in fig. 1;

fig. 6 is a perspective view of the lower housing of the power amplifier box of the directional speaker shown in fig. 1;

fig. 7 is a rear view of the power amplifier box of the directional loudspeaker shown in fig. 1;

fig. 8 is a circuit block diagram of a prior art power amplifier board.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1 and fig. 2, the utility model provides a power amplifier box of directional loudspeaker, it includes shell subassembly 1 and power amplifier board subassembly 2.

The housing assembly 1 is provided with a cavity for mounting the power amplifier board assembly 2. The power amplifier board assembly 2 is wholly located in the cavity, and part of the components are exposed out of the housing assembly 1, such as an interface for connecting with an external device or a button, a knob, an indicator light and the like for man-machine interaction.

The power amplifier board assembly 2 includes a power amplifier board 20 connected to the housing assembly 1 and at least two different kinds of audio input interfaces connected to the power amplifier board 20, and the audio input interfaces are exposed from the housing assembly 1 so as to be connected to an audio cable.

In some embodiments, as shown in fig. 3, the power amplifier board assembly 2 includes a first audio input interface 21 and a second audio input interface 22, where the first audio input interface 21 is a USB interface, and the second audio input interface 22 is an analog audio interface, such as an XLR interface, a TRS interface, an RCA interface, or an AUX interface.

Because the power amplifier box of directional loudspeaker is provided with two at least different kinds of audio input interfaces, consequently, its input mode is more various, can be suitable for different kinds of audio lines to the use of directional loudspeaker's power amplifier box has been made things convenient for. Particularly, when the power amplifier box of the directional loudspeaker is provided with the USB interface, the audio signal can be transmitted through a common USB data line, so that the use is more convenient.

As shown in fig. 4, the power amplifier board assembly 2 includes a power supply unit 23, a control unit 24, a data processing unit 25, a power amplifier unit 26, and a decoding unit 27, which are disposed on the power amplifier board 20.

The power supply unit 23 is used for supplying power to electronic components in the power amplifier box of the directional loudspeaker, and is electrically connected with the control unit 24, the data processing unit 25, the power amplifier unit 26 and the decoding unit 27. The power supply unit 23 can convert the voltage into the same voltage as the rated voltage of each unit to supply power to each unit, for example, convert the input 24V dc voltage into 5V to supply power to the decoding unit 27, and convert the input voltage into 3.3V to supply power to the control unit 24 and the data processing unit 25.

In some embodiments, the power supply unit 23 includes a power supply, for example, a lithium battery pack or a battery pack, and the power supply unit 23 supplies power to the electronic components in the power box of the directional speaker through the power supply built in the power box of the directional speaker. In other embodiments, the power supply unit 23 is provided with a power interface 29, and is connected to an external power source through the power interface 29, so as to supply power to the electronic components in the power box of the directional loudspeaker.

The control unit 24, which is preferably a single chip Microcomputer (MCU), may be a chip of model MM4F103CBT6, for example, for performing calculation and control functions.

The second audio input interface 22, the control unit 24, the power amplifier unit 26 and the decoding unit 27 are all in communication connection with the data processing unit 25, specifically, are electrically connected through a circuit disposed on the power amplifier board 20.

The second audio input interface 22 is an analog audio interface capable of directly inputting audio signals to the data processing unit 25. The first audio input interface 21 is a USB interface, the decoding unit 27 is a decoder, and is connected between the first audio input interface 21 and the data processing unit 25, and the audio signal input by the USB interface is decoded by the decoder and then input into the data processing unit 25. The data processing unit 25 is configured to modulate the input audio signal and the ultrasonic carrier signal to form an ultrasonic modulated signal, output the ultrasonic modulated signal to the power amplifier unit 26, and amplify and output the signal by the power amplifier unit 26. The data processing unit 25 may be, for example, a data processing chip of type ADAU1401AWBSTZ-RL, and the power amplifier unit 26 may be, for example, a power amplifier chip of type TPA 3116.

The power amplifier board assembly 2 further includes an audio output interface 28 disposed on the power amplifier board 20, the audio output interface 28 is electrically connected to the power amplifier unit 26, and is configured to be connected to the external directional sound generating device 5, and send the ultrasonic modulation signal amplified by the power amplifier unit 26 to the directional sound generating device 5, where the directional sound generating device 5 may be, for example, an ultrasonic transducer, and the ultrasonic modulation signal is directionally sent out through the ultrasonic transducer, thereby realizing directional sound generation.

Compare the circuit in prior art, the utility model discloses in, the circuit structure of power amplifier board subassembly 2 is more simple, and the integrated level is higher. For example, the utility model discloses a power amplifier board subassembly 2 adopts a power amplifier unit 26 can realize the power amplification effect, and the circuit among the prior art has adopted a plurality of components and parts to realize the power amplification function.

In order to facilitate the operation of the power amplifier box of the directional speaker, the power amplifier board assembly 2 further includes a human-computer interaction component, the human-computer interaction component is in communication connection with the control unit 24, and the control unit 24 can control corresponding functions of the power amplifier box of the directional speaker according to signals input by the human-computer interaction component, for example, the functions of turning on and off the power amplifier box and increasing or decreasing volume are realized.

The man-machine interaction part can be a button, a knob or a touch screen, for example, the button is used for turning on and turning off the machine, the knob is used for adjusting the volume, and the touch screen can be used for adjusting the volume and modifying parameters. A plurality of man-machine interaction components can be arranged on a power amplifier box of the directional loudspeaker, and the types of the man-machine interaction components can be the same or different. As shown in fig. 1 and 3, in some embodiments, the power board assembly 2 includes an on-off button 30 and a volume knob 31 connected to the power board 20 for implementing an on-off function and a volume adjustment function, respectively.

Further, the power amplifier board assembly 2 further includes an indicator lamp 33, the indicator lamp 33 may be, for example, an LED lamp bead, and can prompt the state of the power amplifier box of the directional speaker through a color or a blinking manner, for example, the LED does not emit light to indicate that the power amplifier box is not turned on, the LED lamp is green to indicate that the power amplifier box is turned on and the device is normal, and the LED lamp is red to indicate that the device is abnormal.

The housing assembly 1 may be formed by connecting two or more housings, as shown in fig. 1 and 2, and in the illustrated embodiment, the housing assembly 1 includes an upper housing 10 and a lower housing 11 connected to the upper housing 10, and a cavity is formed between the upper housing 10 and the lower housing 11.

As shown in fig. 5, the upper case 10 includes a top plate 100 having a substantially rectangular shape and two side plates 102 extending from left and right side edges 100a and 100b of the top plate 100 toward the lower case 11, and the upper case 10 is further provided with a rear cover plate 103 extending from a rear side edge 100c thereof toward the lower case 11 (see fig. 7). The lower housing 11 includes a bottom plate 113 and a front panel 110 extending from a front side 113a of the bottom plate 113 to the top plate 100, after the installation, the front panel 110 abuts against the top plate 100, and the front panel 110, the rear cover plate 103 and the two side plates 102 enclose to form a frame-shaped structure, which cooperates with the top plate 100 and the bottom plate 113 to form the cavity.

As shown in fig. 6, the lower shell 11 further includes a flange 114 protruding toward the upper shell 10, the flange 114 is provided with a first through hole 1140, the side plate 102 is provided with a second through hole 1020 corresponding to the first through hole 1140, and the upper shell 10 and the lower shell 11 are connected by installing fasteners in the two through holes. For example, the second through hole 1020 may be provided as a screw hole, and the upper case 10 and the lower case 11 may be coupled by screwing a bolt through the first through hole 1140 and the second through hole 1020.

In order to facilitate the upper housing 10 and the lower housing 11 to be positioned more accurately when being installed, as shown in fig. 6, the lower housing 11 further includes a limiting member 111 connected to a bottom plate 113 thereof, and the limiting member 111 and the front panel 110 are disposed at an interval along the front-rear direction of the power amplifier box of the directional speaker, extend toward the top plate 100, and abut against the top plate 100. Thus, when the upper housing 10 is connected to the lower housing 11, the front and rear ends of the upper housing 10 can be supported by the front panel 110 and the stopper 111, respectively, and the rear end thereof does not incline downward due to the absence of the support, so that the first through hole 1140 and the second through hole 1020 can be aligned accurately and conveniently. The limiting members 111 are preferably in the form of a strip plate, and the number of the limiting members 111 is not limited, and in fig. 6, one limiting member 111 is disposed at each of the left and right sides of the bottom plate 113. After the upper housing 10 and the lower housing 11 are installed, the rear sealing plate 103 is located outside the limiting member 111 to shield the limiting member 111, so that the whole structure is more beautiful. Preferably, the rear sealing plate 103 is attached to the limiting member 11 to realize positioning in the front-rear direction, so that the first through hole 1140 and the second through hole 1020 are automatically aligned.

Further, the upper end of the front panel 110 is provided with a plate portion 112 bent towards the inside of the housing assembly 1, and the plate portion 112 is attached to the top plate 100, so that on one hand, the mechanical property of the front panel 110 can be enhanced, the bending resistance of the front panel is improved, on the other hand, the attachment area of the top plate 100 and the front panel 110 can be increased, and the attachment degree is ensured, and the front panel are attached to each other more attractively.

In order to improve the heat dissipation effect of the power amplifier box of the directional speaker, the power amplifier box of the directional speaker further includes a heat sink 4 (the reference numeral is shown in fig. 2) connected to the power amplifier board 20, and the heat sink 4 is made of a material with high heat conduction efficiency, for example, an aluminum alloy material, so as to improve the heat dissipation effect. The upper shell 10 is further provided with a heat dissipation hole 101, and the circulation of air flow inside and outside the power amplifier box of the directional loudspeaker is realized through the heat dissipation hole 101, so that the heat dissipation can be accelerated. In some embodiments, as shown in fig. 1, 2 and 5, heat dissipation holes 101 are disposed on both side plates 102 and the top plate 100 of the upper casing 10, so as to increase a flow area and further improve a heat dissipation effect.

The utility model also provides a directional loudspeaker, including the above directional loudspeaker's power amplifier box.

As shown in fig. 4, the directional loudspeaker further includes a directional sound-generating device 5, and the directional sound-generating device 5 is connected to the audio output interface 28 of the power amplifier box of the directional loudspeaker through a signal line, so that it is communicatively connected to the power amplifier unit 26. The directional sound generating device 5 may be, for example, an ultrasonic transducer, and can directionally emit the ultrasonic modulation signal output by the power amplification unit 26 to realize a directional sound generating function.

The above-mentioned is only the embodiment of the present invention, and other improvements made on the premise of the concept of the present invention are all regarded as the protection scope of the present invention.

Claims

1. A power amplifier box of directional loudspeaker, characterized by, includes:

a housing assembly (1); and the number of the first and second groups,

the power amplifier board assembly (2) comprises a power amplifier board (20) connected with the shell assembly (1) and at least two different audio input interfaces connected with the power amplifier board (20).

2. Power amplifier box of directional loudspeaker according to claim 1, characterized in that the power amplifier board assembly (2) comprises a first audio input interface (21) and a second audio input interface (22), the first audio input interface (21) being a USB interface and the second audio input interface (22) being an analog audio interface.

3. Power amplifier box of a directional loudspeaker according to claim 2, characterised in that the second audio input interface (22) is an XLR interface, a TRS interface, an RCA interface or an AUX interface.

4. The power amplifier box of the directional speaker according to claim 2, wherein the power amplifier board assembly (2) further includes a power supply unit (23), a control unit (24), a data processing unit (25), a power amplifier unit (26) and a decoding unit (27) disposed on the power amplifier board (20), the second audio input interface (22), the control unit (24), the power amplifier unit (26) and the decoding unit (27) are all communicatively connected to the data processing unit (25), the decoding unit (27) is connected between the first audio input interface (21) and the data processing unit (25), and the data processing unit (25) is configured to modulate audio signals input by the decoding unit (27) and the second audio input interface (22) with an ultrasonic carrier signal.

5. The power amplifier box of a directional loudspeaker according to claim 4, characterized in that the power amplifier board assembly (2) further comprises an audio output interface (28) disposed on the power amplifier board (20), and the audio output interface (28) is connected to the power amplifier unit (26).

6. A power amplifier box for a directional loudspeaker according to claim 4, characterised in that the power amplifier board assembly (2) further comprises a power interface (29) provided on the power amplifier board (20), the power interface (29) being connected to the power supply unit (23).

7. The power amplifier box of a directional speaker according to any one of claims 1 to 6, wherein the housing assembly (1) comprises an upper housing (10) and a lower housing (11) connected to the upper housing (10), the upper housing (10) comprises a top plate (100), the lower housing (11) comprises a front panel (110) and a stopper (111) extending toward the top plate (100), the front panel (110) and the stopper (111) are spaced apart from each other along a front-rear direction of the power amplifier box of the directional speaker, and both the front panel (110) and the stopper (111) abut against the top plate (100).

8. The power amplifier box of a directional loudspeaker according to claim 7, characterized in that the top of the front panel (110) is provided with a plate part (112) bending towards the inside of the housing assembly (1), and the plate part (112) is attached to the top plate (100).

9. The power amplifier box of a directional speaker according to claim 7, wherein the power amplifier board assembly (2) further comprises a heat sink (4) connected to the power amplifier board (20), and the upper case (10) is provided with heat dissipation holes (101).

10. A directional loudspeaker comprising a power amplifier box for a directional loudspeaker according to any one of claims 1 to 9.