CN213638082U

CN213638082U - Conference loudspeaker and conference loudspeaker system

Info

Publication number: CN213638082U
Application number: CN202022509495.4U
Authority: CN
Inventors: 王岳锋; 吴健勇; 俞豪杰; 徐杨旺
Original assignee: Ningbo Xinfeng Shengyue Technology Co ltd
Current assignee: Ningbo Xinfeng Shengyue Technology Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-07-06
Anticipated expiration: 2030-11-03

Abstract

The embodiment of the utility model discloses loudspeaker and public address system are used in meeting for the meeting is applied to electron device technical field, and this loudspeaker is used in meeting includes: the device comprises a power supply, an audio speaker module, an ultrasonic speaker module and a change-over switch; the selector switch comprises a first switch and a second switch which are linked; the first switch is used for conducting the connection between the audio power amplifier in the audio speaker module and the positive electrode of the power supply in a first working state, and conducting the connection between the signal processing module in the ultrasonic speaker module and the positive electrode of the power supply in a second working state; the second switch is used for conducting the connection between the audio power amplifier and the ultrasonic speaker in the ultrasonic speaker module in the first working state and disconnecting the audio power amplifier and the ultrasonic speaker in the second working state. The conference system has two modes of ultrasonic audio modulation and audio broadcasting, and can be suitable for meeting requirements of multiple different types of conferences such as confidential conferences and common conferences.

Description

Conference loudspeaker and conference loudspeaker system

Technical Field

The utility model belongs to the technical field of electron device, especially, relate to a loudspeaker and public address system are used in meeting for meeting.

Background

As shown in fig. 1, the conventional public address equipment is generally composed of a microphone, an amplifier and a general speaker. On one hand, after being emitted by the microphone, the amplifier and the common loudspeaker, the human voice returns to the microphone again, is amplified and returns to the microphone again, and is circulated in a reciprocating way to form positive feedback, so that the problem of harsh howling often occurs when the sound amplifying equipment is used, and meanwhile, the problems of echo or reverberation and unclear sound are accompanied. On the other hand, sound is transmitted out through the door and window, so certain potential safety hazards also exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a public address ware and public address system are used in meeting have two kinds of modes of ultrasonic wave audio modulation and audio frequency broadcasting, applicable in the needs of the meeting of multiple different grade type such as machine meeting, ordinary meeting.

An aspect of the embodiment of the present invention provides a loudspeaker for conference, include: the device comprises a power supply, an audio speaker module, an ultrasonic speaker module and a change-over switch;

the audio speaker module includes: the microphone is electrically connected with the input end of the audio amplifier, the output end of the audio amplifier is electrically connected with the input end of the audio power amplifier, and the output end of the audio power amplifier is electrically connected with the input end of the audio speaker;

the ultrasonic speaker module includes: signal processing module and ultrasonic wave speaker, wherein, signal processing module includes: an ultrasonic generator, a hybrid modulator and an ultrasonic power amplifier;

the input end of the hybrid modulator is electrically connected with the output end of the ultrasonic generator and the output end of the audio amplifier, the output end of the hybrid modulator is electrically connected with the input end of the ultrasonic power amplifier, and the output end of the ultrasonic power amplifier is electrically connected with the input end of the ultrasonic loudspeaker;

the audio power amplifier, the audio speaker and the ultrasonic speaker are also electrically connected with the negative electrode of the power supply;

the change-over switch comprises a first switch and a second switch which are linked;

the first switch is used for conducting the connection between the audio power amplifier and the anode of the power supply in a first working state, and conducting the connection between the signal processing module and the anode of the power supply in a second working state;

the second switch is used for conducting the connection between the audio power amplifier and the ultrasonic loudspeaker in the first working state and disconnecting the connection between the audio power amplifier and the ultrasonic loudspeaker in the second working state.

Optionally, the loudspeaker for conference further includes: a housing having a plurality of through holes;

the power supply, the audio speaker module, the ultrasonic speaker module and the switch are installed in the housing.

Optionally, the loudspeaker for conference further includes: a frequency dividing capacitor;

the crossover capacitor is disposed between the second switch and the ultrasonic speaker.

Optionally, the loudspeaker for conference further includes: a switch button;

the switch button is arranged on the shell and is electrically connected with the change-over switch.

Optionally, the loudspeaker for conference further includes: the device comprises a signal receiving module and a control chip;

the signal receiving module is electrically connected with the control chip, and the control chip is also electrically connected with the change-over switch.

Optionally, the signal receiving module is mounted in or on the housing, and the control chip is mounted in the housing.

The embodiment of the utility model provides an aspect still provides a public address system is used in meeting, include: the loudspeaker comprises a bracket, a fixed plate, a plurality of rotating motors, a plurality of rotating shafts and a plurality of loudspeakers for the conference provided in the embodiment;

the loudspeaker for the conference is rotatably fixed on the bracket through a plurality of rotating shafts;

the rotating motors are respectively connected with the rotating shafts and used for driving the rotating shafts which are respectively connected to drive the loudspeakers for the conference to respectively rotate.

Optionally, the conference loudspeaker system includes 6 conference loudspeakers, a pointing angle of each conference loudspeaker is 30 degrees, and the 6 conference loudspeakers jointly form a synthetic matrix with a pointing angle smaller than 180 degrees; alternatively, the first and second electrodes may be,

the conference loudspeaker system comprises 9 conference loudspeakers, the pointing angle of each conference loudspeaker is 20 degrees, and the 9 conference loudspeakers jointly form a synthetic matrix with the pointing angle smaller than 180 degrees and larger than 160 degrees.

Optionally, the fixing plate includes a first fixing plate and a second fixing plate, and the bracket is a hollow rectangular bracket;

the cuboid bracket is fixed between the first fixing plate and the second fixing plate;

each loudspeaker for the conference is rotatably fixed in the cavity of the cuboid bracket through each rotating shaft, and each rotating motor is arranged at the upper end of each loudspeaker for the conference.

Optionally, the conference sound reinforcement system further includes: the main control chip and the signal receiver;

the signal receiver is electrically connected with the main control chip, and the main control chip is also electrically connected with each rotary motor.

From the aforesaid the utility model discloses each embodiment can know, the utility model provides a public address loudspeaker and public address system for meeting have following technological effect for the meeting:

1. the audio speaker module and the ultrasonic speaker module are integrated in one speaker, and the linkage switch is used for controlling and switching different working modes of the speaker, so that the manufacturing cost can be reduced, the working efficiency can be improved, the requirements of various different types of conferences such as scheduled conferences and common conference broadcasting can be met, and the advantage of wide application range is achieved;

2. through utilizing the audio signal of ultrasonic wave carrier wave form of ultrasonic wave module output of raising one's voice, because ultrasonic wave carrier directive property is strong, the audio sound wave only can be propagated along the scope of ultrasonic wave speaker's directive angle, does not have the acoustic reflection in the conference room, consequently, both can avoid the howling that the acoustoelectric feedback in the conference room caused, eliminate echo and reverberation, can make the sound signal of output have directive property strong again, advantages such as definition height, security height.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural view of a prior art loudspeaker device;

fig. 2 is an external view of a conference loudspeaker according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a loudspeaker for a conference according to an embodiment of the present invention;

fig. 4 is a schematic view of an operating principle of the loudspeaker for conference according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a conference sound reinforcement system according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection structure between the loudspeaker for a conference and the stand in the loudspeaker system for a conference shown in fig. 5.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are described in detail with reference to the drawings in the following, which are clear and fully illustrated.

Referring to fig. 2, fig. 3 and fig. 4, fig. 2 is an appearance schematic diagram of the loudspeaker for conference provided by an embodiment of the present invention, fig. 3 is a schematic structural diagram of the loudspeaker for conference provided by an embodiment of the present invention, and fig. 4 is a schematic working principle diagram of the loudspeaker for conference provided by an embodiment of the present invention. As shown in fig. 2 to 4, the loudspeaker 1 for conference includes: a power supply 10, an audio speaker module 20, an ultrasonic speaker module 30, and a switch (not shown).

The power supply 10 may include, but is not limited to: the power supply comprises a rechargeable power supply, a power frequency power supply consisting of a power frequency transformer and a rectifying filter, and any one or combination of a plurality of power supplies such as an open-loop switching power supply and a switching stabilized voltage supply (DNC-450A) which use SPM series switching power supply driving modules. Preferably, the power supply 10 is a dc operating power supply.

The audio speaker module 20 includes: an audio amplifier 21, an audio power amplifier 22 and an audio speaker 23. The input end of the audio amplifier 21 is electrically connected to the microphone MIC, the output end of the audio amplifier 21 is electrically connected to the input end of the audio power amplifier 22, and the output end of the audio power amplifier 22 is electrically connected to the input end of the audio speaker 23. The audio speaker used in the present application is a common speaker capable of playing 20-20000Hz (hertz) audio.

Specifically, the audio speaker module 20 is used to play the sound picked up by the microphone at a frequency (e.g., 20-20000Hz) that can be heard by human ears. The audio amplifier 21 is used for processing and amplifying the small signals picked up by the microphone, and then sending the small signals to the audio power amplifier 22 for power amplification. The audio power amplifier 22 is a unit circuit for power-amplifying the signal output from the audio amplifier 21, and is configured to provide a high-power electrical signal to the audio speaker 23 and convert the electrical signal into a high-decibel high-sound signal. In one practical application, for example, an audio amplifier model NE5532, an audio power amplifier model TDA1514A, a high power speaker model JLT0850 with impedance of 8 ohms and power of 50W may be used.

The ultrasonic speaker module 30 includes: a signal processing module 31 and an ultrasonic speaker 32. The signal processing module 31 includes: an ultrasonic generator 311, a hybrid modulator 312, and an ultrasonic amplifier 313. The input end of the hybrid modulator 312 is electrically connected to the output end of the ultrasonic generator 311 and the output end of the audio amplifier 21, the output end of the hybrid modulator 313 is electrically connected to the input end of the ultrasonic power amplifier 313, and the output end of the ultrasonic power amplifier 313 is electrically connected to the input end of the ultrasonic speaker 31.

Specifically, the ultrasonic speaker module 30 is used for outputting an ultrasonic carrier wave, and the working principle thereof is to generate two specially processed ultrasonic beams by using an ultrasonic generator, and when the two ultrasonic beams simultaneously act on the tympanic membrane of the human ear, the auditory sensation can be generated due to the interaction. The ultrasonic generator 311 is used to generate ultrasonic waves. The hybrid modulator 312 is configured to perform hybrid modulation and amplification on the audio signal output by the audio amplifier 21 and the ultrasonic wave generated by the ultrasonic generator 311 to obtain an ultrasonic audio hybrid modulation signal. The ultrasonic power amplifier 313 is configured to power-amplify the ultrasonic audio hybrid modulation signal. The ultrasonic speaker 32 is used for playing ultrasonic waves or ultrasonic audio modulation waves which can not be heard by human ears above 20000 Hz.

It is understood that the ultrasonic generator 311, the hybrid modulator 312, the ultrasonic amplifier 313 and the ultrasonic speaker 32 are common components in the acoustic field, and the structure of the present application is not limited thereto. By way of example, in a practical application, for example, an ultrasonic generator model NE555IC, a hybrid modulator model AD835, an ultrasonic power amplifier model MOSFET, and an ultrasonic speaker model YD2550 may be used.

The audio amplifier 21 is further electrically connected to the positive pole + of the power source 10, and the audio power amplifier 22, the audio speaker 23 and the ultrasonic speaker 32 are further electrically connected to the negative pole-of the power source 10.

It is understood that the audio speaker 23 and the ultrasonic speaker 32 may be a single speaker or a speaker array formed by a plurality of speakers.

The switch specifically includes a first switch k1, a second switch k2 and a peripheral control circuit (not shown). Linkage, namely more than 2 contact switches are controlled to act simultaneously. The first switch k1 is a single-pole double-throw switch and the second switch k2 is a single-pole single-throw switch. The change-over switch in the application is a common switch in the industry, and can be a virtual switch or a physical switch. In practical application, the ganged switch can be switched by a switch button in a manual mode, and an electronic and remote-control change-over switch can be adopted, which is not limited in the application.

Specifically, as shown in fig. 4, the stationary end of the first switch K1 is disposed between the power supply 10 and the audio amplifier 21, and the moving end of the first switch K1 is configured to conduct the connection between the signal processing module 31 of the ultrasonic speaker module 30 and the positive electrode + of the power supply 10 in the second operation state, and to conduct the connection between the audio power amplifier 22 and the positive electrode + of the power supply 10 in the first operation state. The fixed end of the second switch k2 is disposed between the ultrasonic power amplifier 313 and the ultrasonic speaker 32, and the moving end of the second switch k2 disconnects the audio power amplifier 22 from the ultrasonic speaker 32 in the second operating state and connects the audio power amplifier 22 to the ultrasonic speaker 32 in the first operating state.

With reference to fig. 4, the working principle of the loudspeaker 1 for conference provided by the present application is:

when the change-over switch is in the first working state, the moving end of the first switch k1 is located at the left side in fig. 4, the AB of the first switch k1 is connected, and the audio power amplifier 22 is powered through the first switch k1 and enters the working state. At the same time, ABC of the second switch K2 is turned on to switch the ultrasonic speaker 32 to the audio power amplifier 22, and at this time, the conference loudspeaker 1 enters the audio broadcasting mode. The electric signals collected by the microphone are amplified by the audio amplifier 21 and the audio power amplifier 22 in sequence, then transmitted to the audio speaker 23 and the ultrasonic speaker 33 at the same time, and then modulated by the audio speaker 23 and the ultrasonic speaker 33 respectively and then output. In the audio broadcasting mode, the sound output from the conference loudspeaker 1 can be heard by listeners within the reach of the sound wave. In this embodiment, in the audio broadcasting mode, by utilizing the advantage of the good high-frequency characteristic of the ultrasonic speaker, the ultrasonic speaker is used to function as a high-frequency speaker, so that the defect of insufficient high-frequency of the audio speaker can be compensated.

When the changeover switch is in the second operating state, the moving end of the first switch k1 is located on the right side in fig. 4, BC of the first switch k1 is turned on, the connection between the signal processing module 31 of the ultrasonic speaker module 30 and the positive electrode + of the power supply 10 is made, and the ultrasonic power amplifier 32 enters the operating state. At the same time, the second switch K2 disconnects the audio power amplifier 22 from the ultrasonic speaker 32, and the conference loudspeaker 1 enters the ultrasonic audio modulation mode and outputs an audio signal in the form of an ultrasonic carrier wave. The electric signal collected by the microphone is amplified by the audio amplifier 21 and then enters the hybrid modulator 312 to be mixed and modulated with the ultrasonic wave generated by the ultrasonic generator 311. Then, the mixed and modulated signal enters an ultrasonic power amplifier 313 for power amplification, and is finally output by an ultrasonic speaker 32, wherein the output is ultrasonic modulated sound waves. Because the ultrasonic wave has strong directivity, the modulation wave can be heard by the individual listeners only when the modulation wave reaches the individual listeners within the coverage range of the pointing angle, and therefore, the information security is strong.

Optionally, in order to further improve the treble effect of audio playing, as shown in fig. 4, the conference loudspeaker 1 further includes a frequency-dividing capacitor 40. The crossover capacitor 40 is provided between the second switch k2 and the ultrasonic speaker 32, and is connected in series to the ultrasonic speaker 32. The crossover capacitor 40 may be connected in series with either the positive or negative terminal of the ultrasonic speaker 32, preferably the positive terminal of the ultrasonic speaker 32. Preferably, the dividing capacitor 40 is a 2 μ F (microfarad) capacitor.

The crossover capacitor 40 is used for dividing the frequency of the sound signal amplified by the audio amplifier 21 and the audio power amplifier 22 into a high frequency signal and a low frequency signal when the switch is in the first working state, and the high frequency signal after frequency division enters the ultrasonic speaker 32, that is, in the audio broadcasting mode, the ultrasonic speaker 32 only receives and outputs the high frequency signal, so that the noise generated after the low frequency signal enters the ultrasonic speaker 32 can be avoided, and the high-pitched effect of audio playing can be further improved.

Optionally, in another embodiment of the present application, as shown in fig. 2, the loudspeaker 1 for conference further includes: a housing 50 having a plurality of through holes. The power supply 10, the audio speaker module 30, the ultrasonic speaker module 30, and the changeover switch are mounted in the housing 50. The housing 50 protects the power supply 10, the audio speaker module 30, the ultrasonic speaker module 30, and the switch, and plays a role of dust prevention.

Optionally, in another embodiment of the present application, the loudspeaker 1 for conference further includes: a pickup module (not shown in fig. 2 and 3). The sound pickup module may be, for example, a microphone or other similar sound pickup. The sound pickup module is electrically connected to the input end of the audio amplifier 21 and the input end of the ultrasonic amplifier 31, and is configured to pick up an audio signal and input the picked-up audio signal into the audio amplifier 21 and the ultrasonic amplifier 31. Microphones and other sound pickup devices are common devices in the field, and the structure of the sound pickup device is not particularly limited in the present application.

Optionally, in another embodiment of the present application, as shown in fig. 2, the loudspeaker 1 for conference further includes: the push button 60 is switched on and off. The switch button 60 is disposed on the housing 50 and electrically connected to the switch. The switch button 60 is a physical button commonly used in the art, and the structure thereof is not particularly limited in the present application. The user can manually control the change-over switch to be in the first working state or the second working state by pressing the switch button 60.

Optionally, in another embodiment of the present application, the loudspeaker 1 for conference further includes: a signal receiving module and a control chip (not shown in the figure). The signal receiving module is electrically connected with the control chip, and the control chip is also electrically connected with the change-over switch. The signal receiving module may include, but is not limited to: an infrared signal receiver, a bluetooth signal receiver, a Near Field Communication (NFC) signal receiver, and the like. The signal receiving module is used for receiving an external remote control signal and transmitting the external remote control signal to the control chip, and the control chip is used for controlling the changeover switch to be in a first working state or a second working state according to the external remote control signal. In practical application, a small or miniature infrared signal receiver, a Bluetooth signal receiver or an NFC signal receiver which are commonly used in the industry at present can be used as the signal receiving module, and a singlechip with the model number of ATMEGA8A-AU is used as the control chip.

Alternatively, the signal receiving module is mounted in the housing 50 or on the housing 50, and the control chip is mounted in the housing 50.

It can be understood that the installation related to the present embodiment may specifically adopt a common way such as screws, glue or welding, and the application is not limited specifically.

In this embodiment, the audio speaker module and the ultrasonic speaker module are integrated into one speaker, and the linkage switch is used to control and switch different operation modes of the speaker, on one hand, the manufacturing cost is reduced, and the operation efficiency is improved, on the other hand, the audio speaker module can be adapted to the needs of many different types of conferences such as opportunistic conferences and common conference broadcasts, and therefore has the characteristic of wide application range, on the other hand, the audio speaker module is used to output audio signals in the form of ultrasonic carrier waves, and because the directivity of the ultrasonic carrier waves is strong, the audio sound waves can only propagate along the range of the directivity angle of the ultrasonic speaker, and no sound reflection exists in the conference room, therefore, the audio speaker module can avoid the acoustic-electric feedback in the conference room, eliminate echoes and reverberation, and enable the output sound signals to have strong directivity, high definition, whistling, and the like, High security and the like.

Referring to fig. 5, an embodiment of the present invention provides a schematic structural diagram of a conference public address system. As shown in fig. 5, the conference sound reinforcement system includes: a support 2, a fixed plate 3, a plurality of rotating motors 4, a plurality of rotating shafts 5, and a plurality of conference loudspeakers 1 provided in the embodiments shown in fig. 2 to 4.

Specifically, the stand 2 is fixed to the fixed plate 3, and the conference loudspeakers 1 are rotatably fixed to the stand 2 by the rotating shafts 5. Specific examples of the fixing means include, but are not limited to: screws, bearings, welding, fixing glue and the like. The plurality of rotating motors 4 are respectively connected to the plurality of rotating shafts 5, and are used for driving the respective connected rotating shafts 5 to drive the corresponding loudspeaker 1 for the conference to rotate. Optionally, the conference loudspeaker 1, the rotary motor 4, and the rotary shaft 5 correspond to each other one to one.

It is understood that the rotary motor 4 and the rotating shaft 5 are components commonly used in the industry, and in practical applications, for example, a rotary motor with model number ZGB37RG12V24VZYTD520 can be used, and the present application is not limited in particular.

Optionally, in another embodiment of the present application, the conference loudspeaker system may include 6 conference loudspeakers 1. The pointing angles of the loudspeakers 1 for the conference are respectively 30 degrees, and 6 loudspeakers 1 for the conference jointly form a synthetic matrix with the pointing angle smaller than 180 degrees, so that the listening requirement of any angle in the 180-degree range of a transverse listener can be met.

Optionally, in another embodiment of the present application, the conference loudspeaker system may include 9 conference loudspeakers 1, and the 9 conference loudspeakers 1 together form a matrix with a pointing angle smaller than 180 degrees and larger than 160 degrees, so as to meet the listening requirements of the lateral listeners. The directivity angles of the loudspeakers 1 for conference are 20 degrees, respectively, with an error of ± 0.3 degrees.

The output frequency of each loudspeaker 1 for conference in the ultrasonic audio modulation mode is preferably 45KHz (kilohertz).

Further, the fixing plate 3 includes a first fixing plate 3A and a second fixing plate 3B, and the bracket 2 is a hollow rectangular bracket or a frame-shaped bracket. The rectangular parallelepiped bracket is fixed between the first fixing plate 3A and the second fixing plate 3B. As shown in fig. 5 and 6, each loudspeaker 1 for conference is rotatably fixed in the cavity of the rectangular parallelepiped frame by each rotating shaft 5, and each rotating motor 4 is provided at the upper end of each loudspeaker 1 for conference and fixed to the top of the frame 2. The intervals between the conference loudspeakers 1 may be equal or different, and are preferably equal.

Optionally, in another embodiment of the present application, the conference sound reinforcement system further includes: a multi-channel remote control receiving module and/or a rotary control button (not shown) electrically connected to each rotary motor 4. The multichannel remote control receiving module is used for controlling the corresponding rotating motor 4 to drive the corresponding rotating shaft 5 to rotate according to the received remote control signal, so that the horizontal pointing angle of the loudspeaker 1 for the conference is adjusted. The multichannel remote control receiving module can be a multichannel remote control receiver or a multichannel remote control receiver, and specifically can be a multichannel radio remote control receiver with the model number of TWH 9238. The rotary control button is a physical button commonly used in the industry and can be installed on the bracket 2 or the fixing plate 3. The user can adjust the horizontal pointing angle of the conference loudspeaker 1 by pressing the rotation control button to control the rotation motor 4 to drive the corresponding rotation shaft 5 to rotate.

Further, the conference sound reinforcement system further includes a system power supply (not shown in the figure). The system power supply is electrically connected with the multichannel remote control receiving module and the rotating motor 4 and is used for providing electric support for the multichannel remote control receiving module and the rotating motor 4. Specifically, the system power supply may include, but is not limited to: the power supply comprises a rechargeable power supply, a power frequency power supply consisting of a power frequency transformer and a rectifying filter, and any one or combination of a plurality of power supplies such as an open-loop switching power supply and a switching stabilized voltage supply (DNC-450A) which use SPM series switching power supply driving modules.

In actual use, the conference loudspeaker 1 may be, for example, a speaker box. The horizontal directional angle of each audio amplifier of speaker audio amplifier matrix will finely tune according to the environment requirement of in-service use, and this application adopts remote control low-speed motor drive pivot to finely tune the rotation angle of 6 audio amplifiers to it is variable adjustable to realize meeting public address directional angle. An angle rotating motor is installed at the upper end of the 6 sound boxes. Respectively connected to a 6-channel remote control receiver.

In the embodiment, on the first hand, the audio speaker module and the ultrasonic speaker module are integrated in one speaker, and the linkage switch is used for controlling and switching different working modes of the speaker, so that the manufacturing cost is reduced, the working efficiency is improved, and the audio speaker module and the ultrasonic speaker module can meet the requirements of a plurality of different types of conferences such as an opportunistic conference, a common conference broadcast and the like, and therefore, the audio speaker module and the ultrasonic speaker module have the characteristic of wide application range; in the second aspect, the audio signal in the form of ultrasonic carrier wave is output by using the ultrasonic loudspeaking module, so that howling caused by sound-electricity feedback in a conference room can be avoided, and echoes and reverberation are eliminated, and the characteristics of strong directivity, high definition, high confidentiality and the like are realized; in the third aspect, by arranging the loudspeaker matrix with the adjustable angle, the listening requirement of any angle in the range of 180 degrees of a transverse listener is met, and meanwhile, the convenience and the flexibility of equipment control are improved.

The above is a description of the loudspeaker for conference and the loudspeaker system for conference provided by the present invention.

Claims

1. A loudspeaker for conferences, comprising: the device comprises a power supply, an audio speaker module, an ultrasonic speaker module and a change-over switch;

2. The loudspeaker for conferences of claim 1, further comprising: a housing having a plurality of through holes;

3. The loudspeaker for conferences of claim 1, further comprising: a frequency dividing capacitor;

4. The loudspeaker for conferences of claim 2, further comprising: a switch button;

5. The loudspeaker for conferences of claim 2, further comprising: the device comprises a signal receiving module and a control chip;

6. The loudspeaker of claim 5, wherein the signal receiving module is mounted in or on the housing, and the control chip is mounted in the housing.

7. A conference sound reinforcement system, comprising: a stand, a fixed plate, a plurality of rotary motors, a plurality of rotary shafts, and a plurality of conference loudspeakers according to any one of claims 1 to 6;

8. The conference loudspeaker system as in claim 7, wherein said conference loudspeaker system comprises 6 said conference loudspeakers, each of said conference loudspeakers having a directivity angle of 30 degrees, said 6 conference loudspeakers together forming a composite matrix having a directivity angle of less than 180 degrees; alternatively, the first and second electrodes may be,

9. The conference sound reinforcement system according to claim 7 or 8, wherein the fixing plates include a first fixing plate and a second fixing plate, and the bracket is a hollow rectangular parallelepiped bracket;

10. The conference sound reinforcement system according to claim 7 or 8, characterized in that the conference sound reinforcement system further comprises: and the multi-channel remote control receiving module and/or the rotary control button are electrically connected with each rotary motor.