Audio equipment, control panel thereof and howling detection method

Abstract

The invention discloses audio equipment, a control panel thereof and a howling detection method. The audio equipment control panel is arranged in the shell, the audio equipment control panel comprises a circuit board and a power amplifier circuit arranged on the circuit board, and the audio equipment control panel further comprises a resistive load, an audio acquisition assembly, a switching assembly and a control circuit. Wherein the input end of the switching assembly is electrically connected with the output end of the power amplifier circuit, the first output end of the switching assembly is connected with the loudspeaker, the second output end of the switching assembly is electrically connected with the resistive load, and the control circuit is electrically connected with the output end of the audio acquisition assembly and the controlled end of the switching assembly. The howling detection method and device aim at improving the howling detection convenience of the power amplifier circuit on the mainboard in the audio equipment.

Description

Technical Field

[0001] This application relates to the technical field of howling detection, and particularly to an audio device, its control board, and a howling detection method. Background Art

[0002] In current audio devices, a boost-type power amplifier circuit is often used to save components and facilitate circuit design. However, the input capacitor or boost capacitor of the current boost-type power amplifier circuit is prone to howling, which will affect the audio of the audio device. Therefore, during the process of circuit design verification of the control board of the audio device, it is necessary to detect whether the boost power amplifier circuit generates howling. To ensure accuracy, an instrument is generally used for detection instead of direct human ear discrimination. However, if a sound pressure level or an analyzer is used for testing, a special test environment needs to be built, and the testing is very troublesome. Summary of the Invention

[0003] The main purpose of this application is to provide a control board for an audio device, aiming to improve the convenience of detecting howling in the power amplifier circuit on the main board inside the audio device.

[0004] To achieve the above object, this application proposes a control board for an audio device. The audio device includes a housing and a speaker. The control board of the audio device is disposed inside the housing. The control board of the audio device includes a circuit board and a power amplifier circuit disposed on the circuit board. The control board of the audio device further includes:

[0005] A resistive load, disposed on the circuit board;

[0006] An audio acquisition component, disposed on the circuit board, and the audio acquisition component is used to acquire a first audio signal;

[0007] A switching component, disposed on the circuit board. The input end of the switching component is electrically connected to the output end of the power amplifier circuit. The first output end of the switching component is connected to the speaker, and the second output end of the switching component is electrically connected to the resistive load. The switching component is used to conduct the path between its input end and the first output end, or conduct the path between its input end and the second output end;

[0008] A control circuit, disposed on the circuit board, and the control circuit is electrically connected to the output end of the audio acquisition component and the controlled end of the switching component respectively;

[0009] Wherein, the control circuit is configured to output a test audio signal to the power amplifier circuit and control the switching component to conduct the path between its input terminal and the second output terminal when receiving a test signal, so that the power amplifier circuit processes the test audio signal and outputs it to the resistive load, and determine that the power amplifier circuit generates a howling sound when there is a howling audio signal in the first audio signal.

[0010] Optionally, the audio acquisition component includes a microphone or a microphone array; and / or, the resistive load includes a cement resistor.

[0011] Optionally, the output terminal of the power amplifier circuit includes a positive output terminal and a negative output terminal; the switching component includes: a double-pole double-throw switch, the first output terminal of the double-pole double-throw switch includes a first terminal and a fourth terminal, the second output terminal of the double-pole double-throw switch includes a third terminal and a sixth terminal, and the input terminal of the double-pole double-throw switch includes a second terminal and a fifth terminal; the positive output terminal is connected to the second terminal of the double-pole double-throw switch, the negative output terminal is connected to the fifth terminal of the double-pole double-throw switch, the first terminal and the fourth terminal of the double-pole double-throw switch are respectively and correspondingly electrically connected to both ends of the speaker, the third terminal and the sixth terminal of the double-pole double-throw switch are respectively and correspondingly electrically connected to both ends of the resistive load, and the controlled terminal of the double-pole double-throw switch is electrically connected to the control circuit.

[0012] Optionally, the audio device control board further includes:

[0013] A communication module, the communication module is electrically connected to the control circuit, and the communication module is used for communicating with an external terminal;

[0014] The control circuit is further configured to obtain the test signal given by the external terminal through the communication module; and / or,

[0015] It is further configured to obtain the test audio signal given by the external terminal through the communication module; and / or,

[0016] It is further configured to output the howling detection result to the external terminal through the communication module when determining that the power amplifier circuit generates a howling sound.

[0017] Optionally, the test audio signal is a sweep signal of 20 Hz - 20 kHz.

[0018] Optionally, the control circuit is further configured to control the switching component to conduct the path between its input terminal and the first output terminal and output the howling audio signal to the power amplifier circuit when determining that the power amplifier circuit generates a howling sound, so that the power amplifier circuit plays the howling audio signal through the speaker.

[0019] The present application also provides an audio device, which includes the housing, the speaker, and the audio device control board as described in any one of the above;

[0020] Wherein, the audio device control board is disposed inside the housing.

[0021] The present application also provides a howling detection method, which is based on the audio device control board as described in any one of the above. The howling detection method includes:

[0022] The control circuit responds to the test signal, controls the switching component to conduct the path between its input end and the second output end, and outputs a test audio signal to the resistive load through the power amplifier circuit;

[0023] The control circuit determines that the power amplifier circuit generates howling based on the first audio signal collected by the audio acquisition component and when there is a howling audio signal in the first audio signal.

[0024] Optionally, the control circuit determines that the power amplifier circuit generates howling based on the first audio signal collected by the audio acquisition component and when there is a howling audio signal in the first audio signal, including:

[0025] The control circuit amplifies and performs FFT signal processing on the first audio signal, and determines that the power amplifier circuit generates howling when it determines that there is a howling audio signal in the processed first audio signal.

[0026] Optionally, the method further includes:

[0027] When the control circuit determines that the power amplifier circuit generates howling, it controls the switching component to conduct the path between its input end and the first output end and outputs the howling audio signal to the power amplifier circuit, so that the power amplifier circuit plays the howling audio signal through the speaker.

[0028] The audio device control board of the present application includes: a resistive load, an audio acquisition component, a switching component, and a control circuit. Among them, the switching component is used to conduct the path between its input terminal and the first output terminal, or conduct the path between its input terminal and the second output terminal. The control circuit is configured to output a test audio signal to the power amplifier circuit and control the switching component to conduct the path between its input terminal and the second output terminal when receiving a test signal, so that the power amplifier circuit processes the test audio signal and outputs it to the resistive load, and determines that the power amplifier circuit generates a howling sound when there is a howling audio signal in the first audio signal. In this way, through the above settings, during the circuit design and verification of the audio device, since the relevant circuits for howling detection are directly arranged on the audio device control board, there is no need to build complex test instruments and test environments, greatly reducing the test convenience and operation complexity. And because the above audio acquisition component and the power amplifier circuit to be tested are arranged on the same circuit board, and this circuit board is the control board actually used in the audio device, the audio acquisition component can more accurately collect the howling sound that the power amplifier circuit may generate, thus effectively ensuring the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic diagram of the circuit module of an embodiment of the audio device control board of the present application;

[0031] Figure 2 It is a schematic diagram of the circuit module of another embodiment of the audio device control board of the present application;

[0032] Figure 3 It is a schematic diagram of the specific circuit of an embodiment of the audio device control board of the present application;

[0033] Figure 4 It is a schematic diagram of the method flow of an embodiment of the howling detection method of the present application;

[0034] Figure 5 It is a schematic diagram of the method flow of another embodiment of the howling detection method of the present application.

[0035] Description of the reference numerals in the drawings:

[0036] 00 circuit board 10 power amplifier circuit 20 speaker 30 resistive load 40 switching component 50 control circuit 60 audio acquisition component 70 communication module

[0037] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0041] In current audio devices, a boost-type power amplifier circuit is often used to save components and facilitate circuit design. However, the input capacitor or boost capacitor of the current boost-type power amplifier circuit is prone to generate whistling, which will in turn affect the audio of the audio device. Therefore, during the process of circuit design verification of the control board of the audio device, it is necessary to detect whether the boost power amplifier circuit generates whistling. To ensure accuracy, an instrument is generally used for detection instead of direct human ear discrimination. However, if a sound pressure level or an analyzer is used for testing, a special test environment needs to be built, and the testing is very troublesome.

[0042] To this end, the present application proposes an audio device control board. The audio device includes a housing and a speaker 20. The audio device control board is disposed inside the housing. The audio device control board includes a circuit board 00 and a power amplifier circuit 10 disposed on the circuit board 00. The audio device includes a speaker 20. Wherein, the housing can be a metal housing or a plastic housing, etc. The speaker 20 can be disposed on the housing, inside the housing, or on the audio device control board inside the housing. The power amplifier circuit 10 can be a boost type power amplifier circuit 10, for example Figure 3 The boost type power amplifier chip and its peripheral circuit shown in Figure 3 . During the operation of the boost type power amplifier circuit 10, the input capacitors (C1\C2\C3) or the boost capacitors (C4\C5\C6) thereon may generate a howling sound.

[0043] Reference Figure 1 , in an embodiment of the present application, the audio device control board further includes:

[0044] A resistive load 30, disposed on the circuit board 00;

[0045] An audio acquisition component 60, disposed on the circuit board 00. The audio acquisition component 60 is used to acquire a first audio signal;

[0046] A switching component 40, disposed on the circuit board 00. The input end of the switching component 40 is electrically connected to the output end of the power amplifier circuit 10. The first output end of the switching component 40 is connected to the speaker 20. The second output end of the switching component 40 is electrically connected to the resistive load 30. The switching component 40 is used to conduct the path between its input end and the first output end, or conduct the path between its input end and the second output end;

[0047] A control circuit 50, disposed on the circuit board 00. The control circuit 50 is respectively electrically connected to the output end of the audio acquisition component 60 and the controlled end of the switching component 40;

[0048] Wherein, the control circuit 50 is used to output a test audio signal to the power amplifier circuit 10 and control the switching component 40 to conduct the path between its input end and the second output end when receiving a test signal, so that the power amplifier circuit 10 processes the test audio signal and outputs it to the resistive load 30, and determines that the power amplifier circuit 10 generates a howling sound when there is a howling audio signal in the first audio signal.

[0049] In this embodiment, optionally, the resistive load 30 can be implemented using a resistor, such as an alloy resistor, a cement resistor, etc. Among them, the cement resistor has good heat dissipation performance and a relatively stable resistance value, which is suitable for multiple repeated tests during the testing process, effectively ensuring the stability of the test. The parameters of the resistive load 30 can be selected by the R & D personnel according to the parameters of the speaker 20 used in the current audio device. For example, a resistive load 30 with the same resistance value as the current speaker 20 is selected, so as to make the testing process more accurate.

[0050] Optionally, the audio acquisition component 60 can be formed by using a microphone or a microphone array composed of multiple microphones. Among them, since the audio acquisition component 60 is arranged on the circuit board 00 to collect the first audio signal generated on the circuit board 00 and is arranged on the same circuit board 00 as the power amplifier circuit 10, when the power amplifier circuit 10 generates a howling sound, the audio acquisition component 60 can collect it more accurately, thereby further improving the accuracy of howling detection. Further, when designing the circuit board 00, the R & D personnel can arrange the audio acquisition component 60 close to the power amplifier circuit 10 to further improve the accuracy of sampling.

[0051] Optionally, the switching component 40 can be built using multiple switching tubes, such as multiple IGBTs, MOS tubes, etc. Optionally, the switching component 40 can also be implemented using switching devices, such as double-pole double-throw switches, contactors, relays, etc. It can be understood that after the control circuit 50 outputs a test audio signal to the power amplifier circuit 10, if the power amplifier circuit 10 directly outputs to the speaker 20, then the speaker 20 will also play the test audio simultaneously, which will interfere with and affect the audio acquisition component 60's collection of the possible howling sound emitted by the power amplifier circuit 10 on the circuit board 00. Therefore, in order to more accurately detect whether the power amplifier circuit 10 generates a howling sound, a switching component 40 and a resistive load 30 are provided in this application, so that during the testing process of the power amplifier circuit 10, the switching component 40 operates to switch the path between the power amplifier circuit 10 and the speaker 20 to the path between the power amplifier circuit 10 and the resistive load 30. In this way, when the power amplifier circuit 10 outputs the processed test audio signal to the resistive load 30, the resistive load 30 does not emit sound (and as described above, the actual resistance value of the resistive load 30 is close to that of the speaker 20, and it can simulate the working condition of the speaker 20), so that the above audio acquisition component 60 can more accurately collect the possible howling sound generated by the power amplifier circuit 10.

[0052] For example, referring to Figure 3 , the output terminal of the power amplifier circuit 10 includes a positive output terminal ( Figure 3 SPK-P shown in Figure 3as shown in SPK-N); the switching component 40 includes: a double-pole double-throw switch SW, the first output terminal of the double-pole double-throw switch includes a first terminal and a fourth terminal, the second output terminal of the double-pole double-throw switch includes a third terminal and a sixth terminal, and the input terminal of the double-pole double-throw switch includes a second terminal and a fifth terminal; the output positive electrode is connected to the second terminal of the double-pole double-throw switch, the output negative electrode is connected to the fifth terminal of the double-pole double-throw switch, the first terminal and the fourth terminal of the double-pole double-throw switch are respectively and electrically connected to both ends of the speaker 20 in a one-to-one correspondence, the third terminal and the sixth terminal of the double-pole double-throw switch are respectively and electrically connected to both ends of the resistive load 30 in a one-to-one correspondence, and the controlled terminal of the double-pole double-throw switch is electrically connected to the control circuit 50. The double-pole double-throw switch SW is controlled in a linkage manner. The control circuit 50 can control the double-pole double-throw switch to be in a state where its second terminal and the first terminal are connected and conducted and its fifth terminal and the fourth terminal are connected and conducted, or control the double-pole double-throw switch to be in a state where its second terminal and the third terminal are connected and conducted and its fifth terminal and the sixth terminal are connected and conducted, so as to realize the connection switching between the output terminal of the power amplifier circuit 10, the speaker 20, and the resistive load 30.

[0053] Optionally, the control circuit 50 can be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process, digital signal processing chip), an FPGA (Field Programmable Gate Array, programmable logic gate array chip), a PLC, a SOC (System On Chip, system-level chip), etc. Optionally, the test audio signal output by the main controller can be pre-stored in the main controller by R & D personnel in advance. Optionally, the test audio signal of the main controller can also be output from an external terminal to the main controller. Optionally, the test signal received by the main controller can be input from the outside by R & D personnel, for example, by controlling the external terminal to output a test signal to the main controller. Optionally, the test signal received by the main controller can also be sourced from a trigger component inherent in the audio device. For example, a touch screen connected to the main control circuit is provided on the audio device, and R & D personnel can operate on the touch screen to output a pre-stored test signal to the main controller. When the main controller receives the test signal, it will output a test audio signal to the power amplifier circuit 10 and control the switching component 40 to conduct the path between its input terminal and the second output terminal, so that the power amplifier circuit 10 processes the test audio signal and outputs it to the resistive load 30. Among them, the test audio signal includes a sweep signal of 20 Hz - 20 KHz, so as to be able to detect whether the power amplifier circuit 10 generates a howl under different frequency band audios.

[0054] The main controller will output a test audio signal to the power amplifier circuit 10 so that the power amplifier circuit 10 processes it and outputs it to the resistive load 30, and then determines whether there is a howling sound based on the first audio signal collected and output by the audio acquisition component 60. For example, after receiving the first audio signal, the main controller will first amplify it, and then perform FFT signal processing (Fourier transform) to transform the first audio signal into the frequency domain. And when it is determined that the amplitude of the first audio signal in a certain frequency band corresponding to howling (preset by the R & D personnel) reaches the preset amplitude (preset by the R & D personnel), it is determined that there is a howling audio signal in the current first audio signal. When the main controller confirms that there is a howling audio signal in the first audio signal, it will determine that the power amplifier circuit 10 has an effect. Thus, through the above settings, in the process of circuit design and verification of the audio device, since the relevant circuits for howling detection are directly set on the control board of the audio device, there is no need to build complex test instruments and test environments, greatly reducing the test convenience and operation complexity. And since the above audio acquisition component 60 and the power amplifier circuit 10 to be tested are set on the same circuit board 00, and this circuit board 00 is the control board actually used in the audio device, the audio acquisition component 60 can more accurately collect the howling that the power amplifier circuit 10 may generate, thus effectively ensuring the accuracy of the detection.

[0055] Optionally, in another embodiment, when the control circuit 50 determines that the power amplifier circuit 10 has generated a howling sound, it can prompt the user through the prompt component or feedback the result to the external terminal of the user through the communication module 70.

[0056] Optionally, in one embodiment, the control circuit 50 can be set independently of the control terminal of the audio device on the control board of the audio device, or the control circuit 50 itself is the control terminal of the audio device, thereby reducing the size of the control board of the audio device.

[0057] Reference Figure 2 and Figure 3 , in one embodiment of the present application, the control board of the audio device further includes:

[0058] A communication module 70, the communication module 70 is electrically connected to the control circuit 50, and the communication module 70 is used for communicating with an external terminal;

[0059] The control circuit 50 is further used to obtain the test signal given by the external terminal through the communication module 70; and / or,

[0060] It is further used to obtain the test audio signal given by the external terminal through the communication module 70; and / or,

[0061] It is also used to output the crosstalk detection result to an external terminal via the communication module 70 when it is determined that the power amplifier circuit 10 generates crosstalk.

[0062] In this embodiment, the external terminal may be a user's mobile terminal, such as a mobile phone, a laptop, a tablet, etc., or may be a fixed terminal, or may be the cloud. Optionally, the communication module 70 may be implemented by a wired communication module 70, such as a CAN communication module 70, a USB communication module 70, an RS232 communication module 70, etc. For example, as shown in Figure 3 shown, the communication module 70 adopts a USB communication interface, and the USB communication interface is electrically connected to the controller MCU. When the external terminal passes through the USB communication interface, the controller MCU will implement data interaction with the external terminal based on the USB communication protocol.

[0063] Optionally, the communication module 70 may also be implemented by a wireless communication module 70, such as a Wi-Fi communication module 70, a Bluetooth communication module 70, a 4G / 5G communication module 70, etc. The control circuit 50 is electrically connected to the wireless communication module 70, so as to establish data interaction with the external terminal through the wireless communication module 70 and the corresponding type of wireless communication network.

[0064] Optionally, in one embodiment, during the actual test by R & D personnel, the external terminal can be operated to cause the external terminal to send a test signal to the control circuit 50 via the communication module 70, so that the control circuit 50 starts to execute the crosstalk detection process in the above embodiment.

[0065] Optionally, in another embodiment, during the actual test by R & D personnel, the external terminal can also be operated to select the required test audio signal, and then the test audio signal is output to the control circuit 50 by the external terminal through the communication module 70.

[0066] Optionally, in another embodiment, the control circuit 50 can also feedback the crosstalk detection result to the external terminal via the communication module 70 when it is determined that the power amplifier circuit 10 generates crosstalk, so that the user can know at the external terminal. At the same time, based on the embodiment where the above test audio signal is a sweep signal of 20 Hz - 20 KHz, when the control circuit 50 determines that the power amplifier circuit 10 generates crosstalk, it will not only feedback the crosstalk detection result, but also feedback the frequency of the current test audio signal at the same time, so that the user can know at the external terminal at which frequency of the audio signal the power amplifier circuit 10 generates crosstalk. In addition, it can be understood that when the power amplifier circuit 10 does not generate crosstalk, the control circuit 50 can also feedback the detection result that the power amplifier circuit 10 does not generate crosstalk to the external terminal for the user to know.

[0067] It can be understood that the interaction process of at least one of the above embodiments can be achieved between the control circuit 50 and an external terminal.

[0068] It should be understood that based on the above embodiments, although it is possible to more conveniently and simply detect whether there is a howling sound in the capacitor on the power amplifier circuit 10 during its operation. However, in the case of detecting a howling sound, only the control circuit 50 can detect it, and the user still cannot intuitively know that there is a howling sound in the current control board.

[0069] For this reason, referring to Figure 1 and Figure 3 In an embodiment of the present application, the control circuit 50 is further configured to, when determining that the power amplifier circuit 10 generates a howling sound, control the switching component 40 to conduct the path between its input terminal and the first output terminal and output the howling audio signal to the power amplifier circuit 10, so that the power amplifier circuit 10 plays the howling audio signal through the speaker 20.

[0070] In this embodiment, when the control circuit 50 determines that the capacitor of the current power amplifier circuit 10 generates a howling sound during the process based on the above embodiments, it will separately extract the howling audio signal from the first audio signal on the circuit board 00 collected by the audio acquisition component 60 and output it to the power amplifier circuit 10. At the same time, the control circuit 50 will control the switching component 40 to conduct the path between its input terminal and the first output terminal, so that the power amplifier circuit 10 is connected to the speaker 20. At this time, the power amplifier circuit 10 will process the howling audio signal and play it through the speaker 20, so that the user can know that there is a howling sound in the power amplifier circuit 10 on the current audio device control board.

[0071] In an example, referring to Figure 2 when the controller MCU determines that there is a howling sound in the power amplifier circuit 10, it will extract the howling audio signal from the above first audio signal and output it to the power amplifier circuit 10, and at the same time control the double-pole double-throw switch SW to make its second terminal conduct with the first terminal and the fifth terminal conduct with the fourth terminal, so that the power amplifier circuit 10 can process the howling audio signal and output it to the speaker 20 through the double-pole double-throw switch SW, thereby reminding the user that there is a howling sound in the power amplifier circuit 10 on the current audio device control board.

[0072] In addition, it should be understood that since the screeching audio signal played by the speaker 20 is rather harsh and likely to make the user feel slightly uncomfortable. Therefore, it can be understood that in another embodiment, other prompting components may also be provided on the audio device control board, such as a light-emitting prompting component, a vibration prompting component, etc. For example, an LED is provided on the audio device control board. The LED may include a green LED and a red LED. If the control circuit 50 determines that there is no screeching in the current power amplifier circuit 10, the green LED can be controlled to light up. If the control circuit 50 determines that there is screeching in the current power amplifier circuit 10, the red LED can be controlled to light up to remind the user.

[0073] The present application also provides an audio device including the housing, the speaker, and the audio device control board as described in any one of the above. Among them, the audio device control board is disposed inside the housing.

[0074] It should be noted that since the audio device of the present application is based on the above audio device control board. Therefore, the audio device of the present application also has all the technical effects brought by different technical solutions in the power supply test device, which will not be elaborated here one by one.

[0075] Reference Figure 4 , the present application also provides a screeching detection method based on the audio device control board as described in any one of the above embodiments. The screeching detection method includes:

[0076] Step S100: The control circuit responds to the test signal, controls the switching component to conduct the path between its input end and the second output end, and outputs a test audio signal to the resistive load through the power amplifier circuit;

[0077] Step S200: The control circuit determines that the power amplifier circuit generates screeching based on the first audio signal collected by the audio acquisition component and in the case where there is a screeching audio signal in the first audio signal.

[0078] In this embodiment, the test audio signal includes a swept-frequency signal of 20 Hz - 20 KHz, so as to be able to detect whether the power amplifier circuit generates screeching under different frequency band audios. The control circuit can be implemented by a control circuit, such as an MCU, a DSP (Digital Signal Process, digital signal processing chip), an FPGA (Field Programmable Gate Array, programmable logic gate array chip), a PLC, a SOC (System On Chip, system-level chip), etc.

[0079] Optionally, in one embodiment, the test signal received by the control circuit may also be sourced from a trigger component inherent in the audio device. For example, a touch screen connected to the main control circuit is provided on the audio device, and the R & D personnel can operate on the touch screen to output a pre - stored test signal to the control circuit. Optionally, in another embodiment, the test signal received by the control circuit may be input from the outside by the R & D personnel, such as operating an external terminal to output a test signal to the control circuit.

[0080] Optionally, in one embodiment, the test audio signal output by the above - mentioned control circuit may be pre - stored in the control circuit by the R & D personnel in advance. Optionally, the test audio signal of the above - mentioned control circuit may also be output from an external terminal to the control circuit.

[0081] Among them, when the control circuit receives the test signal, it will output a test audio signal to the power amplifier circuit and control the switching component to conduct the path between its input terminal and the second output terminal, so that the power amplifier circuit processes the test audio signal and outputs it to the resistive load. After outputting the test audio signal to the power amplifier circuit so that the power amplifier circuit processes it and outputs it to the resistive load, the control circuit determines whether there is a howling by the first audio signal collected and output by the audio acquisition component. Optionally, in one embodiment, when the control circuit amplifies and performs FFT signal processing on the first audio signal, and determines that there is a howling audio signal in the first audio signal based on the processed first audio signal, it determines that the power amplifier circuit generates howling. For example, after receiving the first audio signal, the control circuit will first amplify it, and then perform FFT signal processing (Fourier transform) to transform the first audio signal into the frequency domain, and when it is determined that the amplitude of the first audio signal in a certain frequency band corresponding to howling (preset by the R & D personnel) reaches a preset amplitude (preset by the R & D personnel), it is determined that there is a howling audio signal in the current first audio signal. When the control circuit confirms that there is a howling audio signal in the first audio signal, it will determine that the power amplifier circuit has an effect. Thus, through the above settings, during the circuit design and verification of the audio device, since the relevant circuits for howling detection are directly provided on the control board of the audio device, there is no need to build complex test instruments and test environments, greatly reducing the test convenience and operation complexity. And because the above - mentioned audio acquisition component and the power amplifier circuit to be tested are provided on the same circuit board, and this circuit board is the actual control board used in the audio device, the audio acquisition component can more accurately collect the howling that the power amplifier circuit may generate, thus effectively ensuring the accuracy of the detection.

[0082] It should be understood that although the above embodiments can realize a more convenient and simple detection of whether there is a howling in the capacitor on the power amplifier circuit during its operation. However, in the case of detecting howling, only the control circuit can detect it, and the user still cannot intuitively know that there is howling in the current control board.

[0083] Referring to Figure 5 , Figure 1 and Figure 3 , in an embodiment of the present application, the method further includes:

[0084] Step S300: When the control circuit determines that the power amplifier circuit generates howling, control the switching component to conduct the path between its input terminal and the first output terminal and output the howling audio signal to the power amplifier circuit, so that the power amplifier circuit plays the howling audio signal through the speaker.

[0085] In this embodiment, when the control circuit determines during the process based on the above embodiment that the capacitor of the current power amplifier circuit generates howling, it will separately extract the part of the howling audio signal from the first audio signal on the circuit board collected by the audio acquisition component. Then, the howling audio signal is separately output to the power amplifier circuit so that the power amplifier circuit processes it and then outputs it through its output terminal. At the same time, the control circuit will control the switching component to act, so as to switch from conducting the path between the output terminal of the power amplifier circuit and the resistive load to conducting the path between the output terminal of the power amplifier circuit and the speaker. In this way, the power amplifier circuit will process the howling audio signal and play it through the speaker via the switching component, so as to achieve the purpose of reminding the user that there is howling in the power amplifier circuit on the current audio device control board.

[0086] The above are only exemplary embodiments of the present application, and do not limit the patent scope of the present application accordingly. All equivalent structural transformations made under the technical concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An audio device control board, the audio device includes a housing and a speaker, the audio device control board is disposed within the housing, the audio device control board includes a circuit board and a power amplifier circuit disposed on the circuit board, characterized in that, The audio device control board further includes: A resistive load, disposed on the circuit board; An audio acquisition component, disposed on the circuit board, and the audio acquisition component is used to acquire a first audio signal; A switching component, disposed on the circuit board, an input end of the switching component is electrically connected to an output end of the power amplifier circuit, a first output end of the switching component is connected to the speaker, and a second output end of the switching component is electrically connected to the resistive load; the switching component is used to conduct a path between its input end and the first output end, or conduct a path between its input end and the second output end; A control circuit, disposed on the circuit board, and the control circuit is respectively electrically connected to an output end of the audio acquisition component and a controlled end of the switching component; Wherein, the control circuit is used to output a test audio signal to the power amplifier circuit and control the switching component to conduct a path between its input end and the second output end when receiving a test signal, so that the power amplifier circuit processes the test audio signal and outputs it to the resistive load, and when there is a howling audio signal in the first audio signal, it is determined that the power amplifier circuit generates howling.

2. The audio device control board according to claim 1, characterized in that, The audio acquisition component includes a microphone or a microphone array; and / or, the resistive load includes a cement resistor.

3. The audio device control board according to claim 1, characterized in that, The output end of the power amplifier circuit includes a positive output terminal and a negative output terminal; the switching component includes: a double-pole double-throw switch, a first output end of the double-pole double-throw switch includes a first terminal and a fourth terminal, a second output end of the double-pole double-throw switch includes a third terminal and a sixth terminal, and an input end of the double-pole double-throw switch includes a second terminal and a fifth terminal; the positive output terminal is connected to the second terminal of the double-pole double-throw switch, the negative output terminal is connected to the fifth terminal of the double-pole double-throw switch, the first terminal and the fourth terminal of the double-pole double-throw switch are respectively electrically connected to both ends of the speaker in a one-to-one correspondence, the third terminal and the sixth terminal of the double-pole double-throw switch are respectively electrically connected to both ends of the resistive load in a one-to-one correspondence, and the controlled end of the double-pole double-throw switch is electrically connected to the control circuit.

4. The audio device control board according to claims 1-3, characterized in that, The audio device control board further includes: A communication module, the communication module is electrically connected to the control circuit, and the communication module is used to communicate with an external terminal; The control circuit is further used to obtain the test signal given by the external terminal through the communication module; and / or, Is further used to obtain the test audio signal given by the external terminal through the communication module; and / or, Is further used to output the howling detection result to the external terminal through the communication module when it is determined that the power amplifier circuit generates howling.

5. The audio device control board according to any one of claims 1-3, characterized in that, The test audio signal is a swept-frequency signal of 20 Hz - 20 kHz.

6. The audio device control board according to any one of claims 1-3, characterized in that, The control circuit is further used to control the switching component to conduct a path between its input end and the first output end and output the howling audio signal to the power amplifier circuit when it is determined that the power amplifier circuit generates howling, so that the power amplifier circuit plays the howling audio signal through the speaker.

7. An audio device, characterized in that, Including the housing, the speaker, and the audio device control board according to any one of claims 1 - 6; Among them, the audio device control board is arranged inside the housing.

8. A howling detection method, characterized in that, Based on the audio device control board according to any one of claims 1-6, the howling detection method includes: The control circuit responds to the test signal, controls the switching component to conduct the path between its input end and the second output end, and outputs a test audio signal to the resistive load through the power amplifier circuit; The control circuit determines that the power amplifier circuit generates howling based on the first audio signal collected by the audio acquisition component and when there is a howling audio signal in the first audio signal.

9. The howling detection method according to claim 8, wherein The control circuit determines that the power amplifier circuit generates howling based on the first audio signal collected by the audio acquisition component and when there is a howling audio signal in the first audio signal, including: The control circuit amplifies and performs FFT signal processing on the first audio signal, and determines that the power amplifier circuit generates howling when it determines that there is a howling audio signal in the processed first audio signal.

10. The howling detection method according to any one of claims 8-9, characterized in that, The method further includes: When the control circuit determines that the power amplifier circuit generates howling, it controls the switching component to conduct the path between its input end and the first output end and outputs the howling audio signal to the power amplifier circuit, so that the power amplifier circuit plays the howling audio signal through the speaker.

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