CN212628418U

CN212628418U - Loudspeaker detection system

Info

Publication number: CN212628418U
Application number: CN202021366456.7U
Authority: CN
Inventors: 闫鑫; 顾善勇; 赵洪强
Original assignee: KING TONE INNOVATION
Current assignee: KING TONE INNOVATION
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-02-26
Anticipated expiration: 2030-07-13

Abstract

The loudspeaker detection system comprises a loudspeaker, a microphone and a power amplifier circuit, wherein the microphone is arranged on a circuit board of the loudspeaker or other circuit boards of electronic equipment, the power amplifier circuit is connected with the loudspeaker and the microphone, and the power amplifier circuit is used for detecting working parameters of the loudspeaker and outputting an adjusting signal to the loudspeaker according to the working parameters. The loudspeaker detection system can adjust the output signal of the loudspeaker in real time, improve the accuracy of the sound signal output by the loudspeaker and further improve the performance of the loudspeaker.

Description

Loudspeaker detection system

Technical Field

The utility model relates to an acoustics detects technical field, concretely relates to speaker detecting system.

Background

A speaker is an indispensable component of portable electronic devices such as mobile phones and radios as a common electroacoustic transducer. When the loudspeaker is actually used, whether the loudspeaker is in a normal working state or not is detected through the microphone, and the audio signal output by the loudspeaker is subjected to nonlinear control and protection through the detection circuit in the loudspeaker, so that the loudspeaker can adjust the output frequency response in time under the condition of distortion of the output sound signal, and good listening experience is brought to a user.

However, in the existing speaker detection circuit, the microphone is usually disposed separately from the speaker or mounted at the sound outlet of the earphone, and such a mounting manner can collect the frequency response of the sound signal output from the inside of the speaker or the earphone core, but the accuracy is low, and the overall structure of the speaker is complex and poor, and the structure needs to be improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a speaker detecting system can improve the degree of accuracy that speaker output sound signal detected.

An embodiment of the utility model provides a speaker detecting system, detecting system includes:

the electronic equipment comprises a shell, an electronic equipment main body and a first circuit board, wherein the first circuit board and the electronic equipment main body are arranged in the shell, and the first circuit board is electrically connected with the electronic equipment main body;

the loudspeaker is arranged in the shell and comprises a second circuit board and a shell, and part of the second circuit board is positioned in the shell;

a microphone disposed on the second circuit board or the first circuit board near the speaker;

and the power amplifier circuit is connected with the loudspeaker and the microphone and is used for detecting working parameters of the loudspeaker and outputting an adjusting signal to the loudspeaker according to the working parameters.

Further, the second circuit board includes a first circuit portion and a second circuit portion connected to each other, the first circuit portion being located inside the housing, the second circuit portion protruding from the housing;

the microphone is disposed on the first circuit portion or the second circuit portion.

Further, the power amplifier circuit includes:

the detection module is connected with the loudspeaker and the microphone and used for detecting working parameters of the loudspeaker and outputting a detection signal;

the signal processor is connected with the detection module and used for receiving the detection signal and outputting an adjustment signal according to the detection signal; and

and the output module is connected between the signal processor and the loudspeaker and used for receiving the adjusting signal and outputting the adjusting signal to the loudspeaker.

Further, the detection module includes:

the frequency response detection unit is connected between the signal processor and the microphone, and is used for detecting frequency response parameters of the loudspeaker through the microphone and feeding the frequency response parameters back to the signal processor;

the voltage detection unit is connected between the signal processor and the loudspeaker and is used for detecting voltage parameters at two ends of the loudspeaker and feeding the voltage parameters back to the signal processor;

the current detection unit is connected between the signal processor and the loudspeaker and is used for detecting current parameters input into the loudspeaker and feeding back the current parameters to the signal processor;

and the signal processor outputs an adjusting signal to the output module according to at least one of the voltage parameter, the current parameter and the frequency response parameter.

Further, the output module includes:

the signal output unit is connected between the signal processor and the loudspeaker and is used for receiving and outputting the adjusting signal;

and the signal amplifier is connected between the signal output unit and the loudspeaker and is used for adjusting and amplifying the adjusting signal and transmitting the amplified adjusting signal to the loudspeaker.

Furthermore, the loudspeaker detection system comprises a plurality of loudspeakers, a plurality of microphones and a plurality of power amplifier circuits, and the number of the loudspeakers, the number of the microphones and the number of the power amplifier circuits are the same.

Furthermore, each power amplifier circuit is connected with the corresponding microphone and the corresponding loudspeaker.

Furthermore, the loudspeaker detection system further comprises a signal input unit connected with the power amplifier circuit and used for inputting an initial signal to the loudspeaker.

Further, outputting the adjustment signal to the speaker includes adjusting a signal output by the power discharge circuit to the speaker or sending a warning signal to the corresponding speaker or turning off the corresponding speaker.

Further, the outputting the adjustment signal to the speaker includes adjusting a voltage.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a speaker detection system according to a first embodiment of the present invention;

fig. 2 is a signal comparison diagram of the first embodiment of the present invention in case of speaker distortion;

fig. 3 is a schematic structural diagram of a speaker according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a speaker according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of an electronic device according to a first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a speaker detection system according to a second embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The power amplifier circuit in the loudspeaker is used for carrying out nonlinear control and protection on the audio signal output by the loudspeaker, so that the loudspeaker can timely adjust the output frequency response under the condition of output sound signal distortion, the service life of the loudspeaker is effectively prolonged, and good listening experience is brought to a user.

Fig. 1 is a schematic structural diagram of a speaker detection system according to the present embodiment. As shown in fig. 1, the speaker detection system of the present embodiment includes a speaker 1, a microphone 2, and a power amplifier circuit 3. The loudspeaker 1 comprises a housing 12 and a second circuit board 11. Part of the second circuit board 11 is located inside the housing 12, and the microphone 2 is arranged on the second circuit board 11, as shown in fig. 3 and 4. The loudspeaker 1 is used for playing a sound signal required by a user. The microphone 2 is used for collecting sound signals (including frequency response output by the loudspeaker) played by the loudspeaker 1.

In the present embodiment, the second circuit board 11 includes a first circuit portion 111 and a second circuit portion 112 connected to each other, the first circuit portion 111 is located inside the housing 12, and the second circuit portion 112 extends from the housing 12. The first circuit portion 111 is used to power the speaker so that the speaker 1 generates sound in the energized state. The second circuit portion 112 is used for being connected with an external power supply, a control module and the like, providing electric energy for the loudspeaker 1 and controlling the loudspeaker 1 to sound.

In the present embodiment, the speaker 1 may be provided as a speaker having any conventional structure, and is not limited to the illustrated structure. The loudspeaker also comprises a vibration mechanism, a magnetic circuit mechanism, a basin frame and other structures. The vibration mechanism and the magnetic circuit mechanism are both arranged in the shell. The first circuit portion 111 is electrically connected to the magnetic circuit mechanism to supply electric power to the magnetic circuit mechanism. The magnetic circuit mechanism generates a magnetic field under the action of electric energy. The vibration mechanism located in the magnetic field vibrates in an energized state to generate sound. The microphone 2 is disposed on the first circuit portion 111 or the second circuit portion 112, that is, the microphone 2 is disposed on a circuit board inside the housing 12 or a circuit board outside the housing 12 and is integrated with the speaker 1, so that it can collect the sound signal output by the speaker 1 when the speaker 1 is in operation. Further, the microphone 2 is disposed on the second circuit board 11, and may be electrically connected to the power amplifier circuit 3 through an electrode.

The speaker 1 and the microphone 2 of the present embodiment may be applied to an electronic device having functions of playing sound and converting the sound into an electronic signal, such as a headset, a mobile phone, and a notebook. The electronic device comprises a shell 5, an electronic device main body 6, a first circuit board 7, a loudspeaker 1, a microphone 2 and a power amplifier circuit 3, as shown in fig. 5. Wherein the housing 5 has an accommodating chamber 51. The electronic device main body 6, the first circuit board 7, the speaker 1, the microphone 2 and the power amplifier circuit 3 are all arranged in the accommodating cavity 51. The loudspeaker 1, the microphone 2 and the power amplifier circuit 3 are the same as those of the above embodiments, and are not described again here. The electronic apparatus main body 6 is electrically connected to the first circuit board 7 so that the electronic apparatus main body 6 can realize functions possessed by the electronic apparatus. Such as displaying pictures, playing videos, etc. The first circuit board 7 is connected to the second circuit part 112 outside the loudspeaker 1 so that the control module of the electronic device can control the loudspeaker 1 simultaneously. The microphone 2 is disposed on the first circuit board 7 and near the speaker 1, as shown in fig. 5. Since the microphone 2 and the speaker 1 are close to each other, the microphone 2 can also perform a function of picking up a speaker sound signal.

The power amplifier circuits 3 in the above embodiments are the same and are both used for connecting the loudspeaker 1 and the microphone 2. The power amplifier circuit 3 is used for detecting working parameters of the loudspeaker 1 and outputting an adjusting signal to the loudspeaker 1 according to the working parameters.

The power amplifier circuit 3 includes a signal processor 31, a signal output unit 32, a frequency response detection unit 33, a voltage detection unit 34, a current detection unit 35, and a signal amplifier 36, as shown in fig. 1. The frequency response detecting unit 33, the voltage detecting unit 34 and the current detecting unit 35 form a detecting module 300, and the detecting module 300 is connected with the loudspeaker 1 and the microphone 2. The frequency response detecting unit 33, the voltage detecting unit 34 and the current detecting unit 35 are respectively used for detecting a frequency response parameter of the loudspeaker 1, a voltage parameter at two ends of the loudspeaker 1 and a current parameter input to the loudspeaker. The signal output unit 32 and the signal amplifier 36 form an output module 400. The output module 400 is connected between the signal processor 31 and the speaker 1, and is configured to receive the adjustment signal, perform adaptive adjustment on the adjustment signal, and output the adjustment signal to the speaker 1.

Specifically, the frequency response detecting unit 33 is connected between the signal processor 31 and the microphone 2, and is configured to detect a change in a frequency response parameter of the speaker 1 (i.e., detect a frequency response of a sound signal played by the speaker 1) in real time through the microphone 2, and feed back the detected frequency response parameter to the signal processor 31 for adjustment. The voltage detection unit 34 is connected between the signal processor 31 and the speaker 1, and is configured to detect a voltage parameter across the speaker 1 and feed back the detected voltage parameter to the signal processor 31.

The current detection unit 35 is connected between the signal processor 31 and the speaker 1, and is configured to detect a current parameter input to the speaker 1 and feed back the detected current parameter to the signal processor 31. Specifically, the current detection unit 35 may be connected in parallel between the signal output unit 32 and the speaker 1 through a sampling resistor for detecting the magnitude of the current passing through the speaker 1.

The signal processor 31 is configured to receive the frequency response parameter, the voltage parameter, and the current parameter fed back by the frequency response detection unit 33, the voltage detection unit 34, and the current detection unit 35, and adjust the signal output to the speaker 1 according to at least one of the parameters, so as to improve the accuracy and usability of the sound signal output by the speaker 1, and make the use of the earphone more convenient. Specifically, the signal processor 31 may modify and transmit the output signal to the signal output unit 32 by filtering or adjusting a voltage, or the like. Preferably, the signal processor 31 can jointly implement the adjustment of the speaker 1 through the frequency response parameter, the voltage parameter and the current parameter at the same time, so as to further improve the accuracy of the adjustment.

The signal output unit 32 is connected between the signal processor 31 and the speaker 1, and is configured to receive the signal output by the signal processor 31 after adjustment and output the adjustment signal to the speaker 1. The signal amplifier 36 is connected between the signal output unit 32 and the speaker 1, and is configured to amplify the output signal of the signal output unit and play the output sound signal in the form of a sound signal by the speaker 1. In the present embodiment, the signal amplifier 36 includes a variable gain amplifier and a power amplifier, and can provide a signal with constant power and maximum power for the speaker 1, and provide good sound quality output for the speaker 1.

In an alternative implementation, the signal processor 31 may be a single chip, a control chip, a digital signal processor, or other components with signal processing functions. The voltage detection unit 34, the current detection unit 35, and the frequency response detection unit 33 may be sensors, detection circuits, or chips.

Preferably, the power amplifier circuit of this embodiment may be electrically connected to the speaker and the microphone through a pad, a flexible printed circuit board or a printed circuit board. The power amplifier circuit can be arranged on a flexible circuit board or a printed circuit board and is connected with electrodes or wiring terminals on the loudspeaker and the microphone through leads on the flexible circuit board or the printed circuit board, so that the detection of the working parameters of the loudspeaker 1 is realized.

Wherein, the signal output part of signal output unit 32 and the sense terminal of voltage detection unit 34 all set up alone, the sense terminal of voltage detection unit can directly be connected with the speaker, reduce the influence of loop resistance to voltage detection unit 34, make the voltage value at voltage detection unit 34 can be accurate detection speaker both ends, improve power amplifier circuit's detection precision greatly, and then improve the degree of accuracy that power amplifier circuit adjusted the speaker, and have simple structure, implement conveniently, advantage that stability is good.

The structural integrity of the loudspeaker is thereby improved by the arrangement of the microphone 2 on the second circuit board 11 of the loudspeaker 1. Meanwhile, the voltage at the two ends of the loudspeaker 1, the passing current and the frequency response of the output sound signal can be detected in real time by communicating the loudspeaker 1, the microphone 2 and the power amplifier circuit 3, and the sound signal output by the loudspeaker 1 can be timely adjusted according to the detected working parameters (namely, the voltage at the two ends of the loudspeaker 1, the passing current and the frequency response of the output sound signal), so that the accuracy of the sound signal output by the loudspeaker 1 is improved, and the use performance of the loudspeaker 1 is improved.

Preferably, the second circuit board 11 in the present embodiment is configured as an elastic pad. The power amplifier circuit 3 is arranged on a flexible circuit board or a printed circuit board. When the loudspeaker 1 is used, the flexible circuit board or the printed circuit board where the power amplifier circuit 3 is located is electrically connected with the elastic bonding pad, a detection circuit system of the loudspeaker 1 is established, the working parameters of the loudspeaker 1 are detected in real time, the output signal of the loudspeaker 1 is timely adjusted through detected feedback working parameter data, and the accuracy of the sound signal output by the loudspeaker 1 and the use performance of the loudspeaker 1 are improved.

Meanwhile, the loudspeaker 1 is connected with the voltage detection unit 34 and the current detection unit 35 through the second circuit board 11, and the microphone 2 is connected with the frequency response detection unit 33 through the second circuit board 11, so that the detection circuit can detect the voltage at two ends of the loudspeaker 1, the passing current and the output frequency response in real time, and the signal processor 31 timely adjusts the working state (audio signal) of the loudspeaker 1 according to the detected working parameters, thereby achieving the purpose of dynamic balance of the acoustic performance and reliability of the loudspeaker.

In the present embodiment, the microphone 2 is preferably a MEMS (micro electro mechanical system) microphone. When the loudspeaker 1 generates local leakage, the sound signal output by the loudspeaker 1 varies, and the detection unit detects that the obtained frequency response parameter, voltage parameter and current parameter change correspondingly. The signal processor 31 judges whether there is leakage from the speaker 2 based on the speaker voltage, current and frequency response detected by the frequency response detecting unit 33, the voltage detecting unit 34 and the current detecting unit 35, respectively, and changes the signal output from the signal output unit 32 to the speaker 1 based on the degree of leakage. When the loudspeaker 1 has no leakage, no adjustment is needed; when the loudspeaker 1 has slight leakage, the frequency response and the tone quality of the loudspeaker 1 can be the same as those of the loudspeaker 1 in the non-leakage state by adjusting the voltage; when the loudspeaker 1 is in a serious leakage state and the sound effect cannot be effectively adjusted through the input signal, an additional warning signal is sent to the loudspeaker to remind a user of timely maintaining or replacing components.

Similarly, the loudspeaker detection system can also comprise a communication unit in communication connection with the playing terminal, and is used for sending a loudspeaker working state signal to the playing terminal, for example, the result detected by the frequency response detection unit can be sent to the playing terminal such as a player and a mobile phone, the user can download related APP to realize the visualization of the loudspeaker working state, the user can check whether the loudspeaker is leaked in the using process through the playing terminal, and the part is timely maintained or replaced through the real-time detection result.

Fig. 2 is a signal comparison diagram in the case of the distortion of the speaker of the present embodiment. As shown in fig. 2, taking the time domain response of the speaker when the input signal is a standard sine wave as an example for explanation, when there is distortion in the sound signal output by the speaker, there is a difference between the sound signal output by the speaker (i.e., the sound signal collected by the microphone) and the input signal, and the amplitude difference at the peak and the trough in the time domain response curve is particularly obvious. The amplitude difference value between the output signal and the input signal of the loudspeaker is acquired, when the amplitude difference value reaches a preset condition, the amplitude of the input signal of the loudspeaker is improved through the signal processor, so that the sensitivity of the output signal of the loudspeaker at the wave crest and the wave trough is improved, a time domain oscillogram which is closer to or consistent with the amplitude of the input signal is achieved, and the accuracy of the output signal of the loudspeaker is improved.

The loudspeaker detection system of this embodiment in time adjusts the output signal of speaker 1 under the condition that there is the distortion in speaker 1 output sound signal, improves the degree of accuracy that speaker 1 outputs sound signal, and then improves the performance of speaker 1, makes the use of speaker 1 more convenient.

Fig. 6 is a schematic structural diagram of a speaker detection system according to another embodiment of the present invention. The speaker detection system of the present embodiment includes a plurality of speakers 1, a plurality of microphones 2, and a plurality of power amplifier circuits 3. The number of the loudspeakers 1, the number of the microphones 2 and the number of the power amplifier circuits 3 are the same. The speaker 1, the microphone 2 and the power amplifier circuit 3 are respectively the same as the speaker 1, the microphone 2 and the power amplifier circuit 3 in the previous embodiment, and are not described herein again.

In this embodiment, each power amplifier circuit 3 is connected to the corresponding microphone 2 and the corresponding speaker 1, and the arrangement and connection manner of each power amplifier circuit are the same as those of the previous embodiment. That is, the plurality of power amplifier circuits 3 are arranged in parallel. In the present embodiment, the plurality of speakers 1 have the same signal input unit 4, so that the plurality of speakers 1 can play the same sound signal at the same time. The signal input unit 4 is connected to the signal processors 31 of the plurality of power amplifier circuits 3, respectively, and is configured to simultaneously input the initial signals to the plurality of speakers 1. Meanwhile, different loudspeakers 1 are connected with different microphones 2 and different power amplifier circuits 3, so that different loudspeakers 1 can be detected and regulated respectively.

When the distortion condition of the signal output by a certain loudspeaker 1 is detected, the detection signal can be changed through the corresponding power amplifier circuit 3, so that the tone quality of the output signal is improved. Besides, when it is detected that the distortion of the signal output by a certain speaker 1 cannot improve the sound quality of the output signal by adjusting the signal, the corresponding speaker 1 can be turned off, and this operation does not affect the normal sound production of other speakers 1.

The power amplifier circuit's that this embodiment provided signal processor can judge whether there is the leakage in the speaker according to the working parameter of the speaker that the detecting element detected, and change the signal output unit to the signal of speaker output when the speaker has the leakage, through adjustment power amplifier output and filtering, make the speaker reach better audio, or through warning sound, the output signal of mode suggestion user such as play terminal demonstration leakage testing result in time adjusting the speaker, thereby make the speaker reach better result of use.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A loudspeaker detection system, the detection system comprising:

the electronic equipment comprises a shell (5), an electronic equipment main body (6) and a first circuit board (7), wherein the first circuit board (7) and the electronic equipment main body (6) are arranged in the shell (5), and the first circuit board (7) and the electronic equipment main body (6) are electrically connected;

the loudspeaker (1) is arranged in the shell (5), the loudspeaker (1) comprises a second circuit board (11) and a shell (12), and part of the second circuit board (11) is positioned in the shell (12);

a microphone (2) arranged on the second circuit board (11) or on the first circuit board (7) close to the loudspeaker (1);

the power amplifier circuit (3) is connected with the loudspeaker (1) and the microphone (2), and the power amplifier circuit (3) is used for detecting working parameters of the loudspeaker (1) and outputting an adjusting signal to the loudspeaker (1) according to the working parameters.

2. A loudspeaker detection system according to claim 1, wherein the second circuit board (11) comprises a first circuit portion (111) and a second circuit portion (112) connected to each other, the first circuit portion (111) being located within the housing (12), the second circuit portion (112) protruding from the housing (12);

the microphone (2) is arranged on the first circuit part (111) or on the second circuit part (112).

3. Loudspeaker detection system according to claim 1, wherein the power amplifier circuit (3) comprises:

the detection module (300) is connected with the loudspeaker (1) and the microphone (2) and is used for detecting working parameters of the loudspeaker and outputting a detection signal;

the signal processor (31) is connected with the detection module (300) and is used for receiving the detection signal and outputting an adjusting signal according to the detection signal; and

an output module (400) connected between the signal processor (31) and the loudspeaker (1) for receiving the adjustment signal and outputting the adjustment signal to the loudspeaker (1).

4. The loudspeaker detection system according to claim 3, wherein the detection module (300) comprises:

the frequency response detection unit (33) is connected between the signal processor (31) and the microphone (2), and the frequency response detection unit (33) is used for detecting frequency response parameters of the loudspeaker (1) through the microphone (2) and feeding back the frequency response parameters to the signal processor (31);

the voltage detection unit (34) is connected between the signal processor (31) and the loudspeaker (1), and the voltage detection unit (34) is used for detecting voltage parameters at two ends of the loudspeaker (1) and feeding the voltage parameters back to the signal processor (31);

the current detection unit (35) is connected between the signal processor (31) and the loudspeaker (1), and the current detection unit (35) is used for detecting a current parameter input into the loudspeaker (1) and feeding the current parameter back to the signal processor (31);

the signal processor (31) outputs the adjustment signal to the output module (400) according to at least one of the voltage parameter, the current parameter, and the frequency response parameter.

5. The loudspeaker detection system according to claim 3, wherein the output module (400) comprises:

a signal output unit (32) connected between the signal processor (31) and the loudspeaker (1), the signal output unit (32) being configured to receive and output the adjustment signal;

and the signal amplifier (36) is connected between the signal output unit (32) and the loudspeaker (1), and the signal amplifier (36) is used for adjusting and amplifying the adjusting signal and transmitting the amplified adjusting signal to the loudspeaker (1).

6. Loudspeaker detection system according to any of claims 1-5, wherein the loudspeaker detection system comprises a plurality of loudspeakers (1), a plurality of microphones (2) and a plurality of power amplifier circuits (3), wherein the number of loudspeakers (1), the number of microphones (2) and the number of power amplifier circuits (3) are the same.

7. The loudspeaker detection system according to claim 6, wherein each power amplifier circuit (3) is connected to the corresponding microphone (2) and the corresponding loudspeaker (1).

8. The loudspeaker detection system according to claim 7, further comprising a signal input unit (4) connected to the power amplifier circuit (3) for inputting an initial signal to the loudspeaker (1).

9. The loudspeaker detection system according to claim 6, wherein outputting the adjustment signal to the loudspeaker (1) comprises adjusting the signal output by the power amplifier circuit (3) to the loudspeaker (1) or sending an alarm signal to the corresponding loudspeaker (1) or turning off the corresponding loudspeaker (1).

10. Loudspeaker detection system according to claim 9, wherein the output of the adjustment signal to the loudspeaker (1) comprises a regulated voltage.