Clipping detection system and clipping detection device

Abstract

The utility model provides a clipping detection system and a clipping detection device. A driving system comprises an extraction circuit, a comparison circuit and a conditioning circuit. The first input end of the comparison circuit is connected with the first output end of the extraction circuit, and the second input end of the comparison circuit is connected with the second output end of the extraction circuit; and the conditioning circuit is connected with the output end of the comparison circuit and a controller of the power amplifier. The extraction circuit obtains a first output signal and a second output signal according to output waveforms of the power amplifiers and outputs the first output signal and the second output signal to the comparison circuit, the comparison circuit obtains a comparison signal according to the first output signal and the second output signal and outputs the comparison signal to the conditioning circuit, and the conditioning circuit generates an indication signal based on the comparison signal and outputs the indication signal to the controller. The controller drives the power amplifier based on the indication signal. The system can perform clipping detection on a plurality of power amplifiers at the same time, the number of circuit devices is small, the circuit is simplified, the cost is reduced, and the detection reliability is high.

Description

Technical Field

[0001] This application relates to the field of audio power amplifier technology, and more specifically, to a clipping detection system and clipping detection device. Background Technology

[0002] Currently, audio equipment typically includes a power amplifier to amplify and output audio signals. However, power amplifiers may experience clipping issues during operation. Severe clipping can affect sound quality, cause distortion, and even damage connected devices such as speakers. Therefore, clipping detection of power amplifiers is necessary.

[0003] In related technologies, a clipping detection circuit is usually set up for the output of each power amplifier, which makes the circuit complex, has many circuit components, and is expensive. Utility Model Content

[0004] To address the aforementioned issues, this application provides a clipping detection system and a clipping detection device, aiming to solve the problems of complex circuitry, numerous circuit components, and high cost associated with setting up a clipping detection circuit for each power amplifier output in related technologies.

[0005] In a first aspect, this application provides a clipping detection system, including an extraction circuit, a comparison circuit, and a conditioning circuit. Multiple input terminals of the extraction circuit are connected to the output terminals of multiple power amplifiers. A first input terminal of the comparison circuit is connected to a first output terminal of the extraction circuit, and a second input terminal of the comparison circuit is connected to a second output terminal of the extraction circuit. The conditioning circuit is connected to the output terminal of the comparison circuit and a controller of the power amplifiers. Specifically, the extraction circuit obtains a first output signal and a second output signal based on the output waveforms of the multiple power amplifiers and outputs them to the comparison circuit. The comparison circuit obtains a comparison signal based on the first and second output signals and outputs it to the conditioning circuit. The conditioning circuit generates an indication signal based on the comparison signal and outputs it to the controller, so that the controller drives the power amplifiers based on the indication signal.

[0006] In the above technical solution, the clipping detection system provided in this application extracts circuitry connected to the output terminals of multiple power amplifiers to simultaneously acquire and detect the output waveforms of multiple power amplifiers. Based on the output waveforms of multiple power amplifiers, it extracts the positive and negative peak values ​​of all output channels to determine whether clipping occurs in the positive and negative peak values ​​of the output waveforms, resulting in high detection reliability. Then, a comparison circuit and a conditioning circuit generate a corresponding detection signal (i.e., an indication signal), which enables the controller to drive the power amplifier based on the indication signal, thereby adjusting the output of the power amplifier, reducing clipping problems, and improving the reliability and lifespan of the power amplifier. Furthermore, a single clipping detection system can simultaneously detect clipping in multiple power amplifiers, requiring fewer circuit components, simplifying the circuitry, and reducing costs.

[0007] In conjunction with the first aspect, in some possible implementations, the extraction circuit includes multiple extraction modules and a first resistor. Each extraction module includes a second resistor, a third resistor, a first diode, a second diode, a third diode, and a fourth diode. One end of the second resistor and one end of the third resistor serve as input terminals of the extraction circuit and are connected to the output terminal of the power amplifier. The other end of the second resistor is connected to the anode and cathode of the first diode. The other end of the third resistor is connected to the anode of the third diode and the cathode of the fourth diode. The cathode of the first diode is connected to one end of the first resistor and the cathode of the third diode. The anodes of the second diode and the fourth diode are connected to the other end of the first resistor. One end of the first resistor serves as the first output terminal of the extraction circuit and is connected to the first input terminal of the comparator circuit. The other end of the first resistor serves as the second output terminal of the extraction circuit and is connected to the second input terminal of the comparator circuit.

[0008] In the above technical solution, the bridge-connected diodes (first, second, third, and fourth) in the extraction module can perform polarity matching on the power amplifier output. The first resistor can adjust the impedance accordingly to avoid damage to subsequent circuits due to excessive impedance, thus ensuring the operational reliability of the extraction module and subsequent circuits. Secondly, when clipping occurs at either the first or second terminal, the corresponding first and second output signals Peak+ and Peak- connected to these terminals will be converted into high-voltage positive and negative peak trigger pulse signals to detect the clipping phenomenon, achieving high reliability and accuracy.

[0009] In conjunction with the first aspect and the above implementation methods, in some possible implementations, the comparator circuit includes a first switch, a first threshold module, a second switch, a second threshold module, a comparator, and a fourth resistor; the controlled terminal of the first switch is connected to one end of the third resistor as the first input terminal of the comparator circuit; the first terminal of the first switch is connected to one end of the fourth resistor and connected to a power voltage; the second terminal of the first switch is connected to the first terminal of the first threshold module, the second terminal of the first threshold module is grounded; the third terminal of the first threshold module is connected to the inverting input terminal of the comparator; the controlled terminal of the second switch is connected to the other end of the first resistor as the second input terminal of the comparator circuit; the first terminal of the second switch and the other end of the fourth resistor are connected to a common ground; the second terminal of the second switch is connected to the first terminal of the second threshold module, the second terminal of the second threshold module is connected to a power voltage; the third terminal of the second threshold module is connected to the non-inverting input terminal of the comparator; and the output terminal of the comparator is connected to the conditioning circuit as the output terminal of the comparator circuit; wherein the conduction characteristics of the first switch and the second switch are opposite.

[0010] In the above technical solution, the high-voltage positive and negative peak trigger pulse signals (i.e., the first output signal and the second output signal) can be converted into a positive pulse output signal (i.e., a comparison signal) through the first switch, the second switch, and the comparator, effectively protecting subsequent circuit components. Furthermore, direct measurement of positive and negative peaks may introduce certain errors; converting them into positive pulses allows for more accurate measurement, improving the detection accuracy and reliability of the clipping detection system. Secondly, the fourth resistor provides a static operating point, ensuring that the first and second inverted signals maintain a stable static operating point. At this point, the comparator will also output a corresponding comparison signal, preventing the comparator from failing to output correctly when clipping is not present, thus ensuring the comparator's output reliability.

[0011] Combining the first aspect and the above implementation methods, in some possible implementation methods, the first threshold module includes a fifth resistor and a sixth resistor. One end of the fifth resistor serves as the first end of the first threshold module and is connected to the second end of the first switch. The node where the other end of the fifth resistor is connected to one end of the sixth resistor serves as the third end of the first threshold module and is connected to the inverting input of the comparator. The other end of the sixth resistor serves as the second end of the first threshold module and is grounded.

[0012] And / or,

[0013] The second threshold module includes a seventh resistor and an eighth resistor. One end of the seventh resistor serves as the first terminal of the second threshold module and is connected to the second terminal of the second switch. The node where the other end of the seventh resistor is connected to one end of the eighth resistor serves as the third terminal of the second threshold module and is connected to the non-inverting input terminal of the comparator. The other end of the eighth resistor serves as the second terminal of the second threshold module and is connected to the power voltage.

[0014] In the above technical solution, when the first output signal and the second output signal are not high-voltage positive and negative peak trigger pulse signals, neither the first switch nor the second switch is conducting. At this time, the first terminal of the first switch and the first terminal of the second switch are connected through the fourth resistor, and the power voltage is connected to the ground terminal through the fourth resistor. The first inverted signal is grounded through the fifth and sixth resistors, and the second inverted signal is connected to the power voltage through the seventh and eighth resistors, so that the first inverted signal and the second inverted signal maintain a stable static operating point, enabling the comparator to output a stable comparison signal accordingly, thereby ensuring the reliability of the comparator's output.

[0015] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the conditioning circuit includes a third switch, a fourth switch, a fifth switch, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; the controlled terminal of the third switch is connected to the output terminal of the comparator circuit, the first terminal of the third switch is connected to one end of the ninth resistor and the first terminal of the fourth switch, the other terminal of the ninth resistor is connected to the power voltage, the controlled terminal of the fourth switch is connected to the threshold voltage, the second terminal of the third switch is connected to one end of the tenth resistor and the eleventh resistor, the other terminal of the eleventh resistor is connected to the controlled terminal of the fifth switch, the first terminal of the fifth switch, the second terminal of the fourth switch, and the other terminal of the tenth resistor are connected to ground, the second terminal of the fifth switch is connected to the controller and one terminal of the twelfth resistor, and the other terminal of the twelfth resistor is connected to the power supply voltage.

[0016] In the above technical solution, when the amplitude of the stable trigger signal exceeds the threshold voltage, the indicator signal goes high, representing a valid clipping signal. The controller drives the power amplifier based on this indicator signal to adjust the power amplifier's output. When the amplitude of the stable trigger signal is lower than the threshold voltage, it indicates a normal signal, and no clipping occurs in the power amplifier. Thus, the conditioning circuit compares the stable trigger signal with the threshold voltage, and then converts the comparison result into a low-voltage signal as the final indicator signal fed back to the controller. This allows the controller to accurately determine whether clipping exists in the power amplifier based on the indicator signal, resulting in high reliability and accuracy.

[0017] In combination with the first aspect and the above implementation, in some possible implementations, the conditioning circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixth switch; one end of the thirteenth resistor is connected to the output terminal of the comparator circuit, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor and the controlled terminal of the sixth switch, the first end of the sixth switch and the other end of the fourteenth resistor are connected to ground, the second end of the sixth switch is connected to one end of the fifteenth resistor and the controller, and the other end of the fifteenth resistor is connected to the power supply voltage.

[0018] In the above technical solution, the sixth switch can adjust the high-voltage trigger signal with interference in the stable trigger signal into a low-voltage regular trigger signal, and then feed the low-voltage signal back to the controller as the final indication signal, so that the controller can accurately know whether the power amplifier has clipping phenomenon based on the indication signal, and the detection reliability and detection accuracy are high.

[0019] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the clipping detection system further includes a filter circuit, the first terminal of the filter circuit is connected to the output terminal of the comparator circuit, the second terminal of the filter circuit is grounded, and the third terminal of the filter circuit is connected to the conditioning circuit.

[0020] In the above technical solution, the filtering circuit can filter out high-frequency fluctuation pulses in the comparison signal, thereby obtaining a stable trigger signal and outputting it to the conditioning circuit. The filtering circuit can significantly improve the signal quality, making the processing or measurement of subsequent circuits more accurate. Secondly, high-frequency pulses may damage or interfere with downstream circuits (such as conditioning circuits and controllers), causing them to malfunction. The filtering circuit can effectively protect the components in these downstream circuits from damage, thereby ensuring the operational reliability of the downstream circuits and enhancing the overall operational reliability and stability of the clipping detection system.

[0021] In combination with the first aspect and the above implementation, in some possible implementations, the filter circuit includes a fifth diode, a first capacitor, and a sixteenth resistor; the positive terminal of the fifth diode is connected to the output terminal of the comparator circuit, the negative terminal of the fifth diode is connected to the first plate of the first capacitor, one end of the sixteenth resistor, and the conditioning circuit, and the second plate of the first capacitor is connected to the other end of the sixteenth resistor via a common ground.

[0022] In the above technical solution, the positive terminal of the fifth diode is connected to the comparison signal. The fifth diode has unidirectional conductivity, meaning it only allows current to flow in one direction. The fifth diode blocks the negative half-cycle current in the comparison signal, allowing only the positive half-cycle to pass through, thus extracting the peak value of the signal. The signal is then filtered by the first capacitor and the sixteenth resistor to obtain a stable trigger signal output to the conditioning circuit, preventing high-frequency pulses from damaging or interfering with subsequent circuits.

[0023] In combination with the first aspect and the above implementation, in some possible implementations, the filter circuit includes a sixth diode, a seventh diode, a seventeenth resistor, an eighteenth resistor, and a second capacitor; the negative terminal of the sixth diode is connected to the output terminal of the comparator circuit and the positive terminal of the seventh diode, the positive terminal of the sixth diode is connected to one end of the seventeenth resistor, the other end of the seventeenth resistor is connected to the conditioning circuit, one end of the eighteenth resistor, and the first plate of the second capacitor, the other end of the eighteenth resistor is connected to the negative terminal of the seventh diode, and the second plate of the second capacitor is grounded.

[0024] In the above technical solution, the resistance value of the seventeenth resistor is set to be relatively large, while the resistance value of the eighteenth resistor is set to be relatively small. The seventeenth and eighteenth resistors allow the signal edges of the comparison signal to rise and fall quickly. This means a shorter transition time from low to high (or vice versa), thereby reducing the delay in the propagation and processing of the comparison signal. This rapid transition allows subsequent circuits to identify the filtered, stable trigger signal in a shorter time and output a corresponding indication signal to the controller based on this stable trigger signal, thus shortening the detection time and reducing clipping.

[0025] Secondly, embodiments of this application also provide a clipping detection device, including a controller, multiple power amplifiers, and a clipping detection system as described in any optional manner of the first aspect, wherein the clipping detection system is connected to the controller and the output terminals of the multiple power amplifiers. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the module structure of a clipping detection device provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the module structure of another clipping detection device provided in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the module structure of another clipping detection device provided in the embodiments of this application;

[0029] Figure 4 This is a partial circuit structure diagram of a clipping detection system provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the signal waveform of a clipping detection system provided in an embodiment of this application;

[0031] Figure 6 This is a partial circuit structure diagram of another clipping detection system provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the signal waveform of another clipping detection system provided in an embodiment of this application;

[0033] Figure 8 This is a partial circuit structure diagram of another clipping detection system provided in the embodiments of this application;

[0034] Figure 9 This is a schematic diagram of the module structure of another clipping detection device provided in the embodiments of this application;

[0035] Figure 10This is a partial circuit structure diagram of another clipping detection system provided in the embodiments of this application;

[0036] Figure 11 This is a schematic diagram of the signal waveform of another clipping detection system provided in the embodiments of this application;

[0037] Figure 12 This is a partial circuit structure diagram of another clipping detection system provided in the embodiments of this application;

[0038] Figure 13 This is a schematic diagram of the signal waveform of another clipping detection system provided in the embodiments of this application;

[0039] Figure 14 This is a schematic diagram of the circuit structure of a conditioning circuit provided in an embodiment of this application;

[0040] Figure 15 This is a schematic diagram of the signal waveform of another clipping detection system provided in the embodiments of this application;

[0041] Figure 16 This is a schematic diagram of the circuit structure of another conditioning circuit provided in an embodiment of this application;

[0042] Figure 17 This is a schematic diagram of the signal waveform of another clipping detection system provided in the embodiments of this application;

[0043] Figure 18 This is a schematic diagram of the circuit structure of a clipping detection system provided in an embodiment of this application;

[0044] Figure 19 This is a schematic diagram of the circuit structure of another clipping detection system provided in the embodiments of this application.

[0045] In the attached figures, the following labels are used:

[0046] 1. Controller; 2. Power amplifier; 3. Clipping detection system; 31. Extraction circuit; 311. Extraction module; 32. Comparison circuit; 321. First threshold module; 322. Second threshold module; 33. Conditioning circuit; 34. Filtering circuit;

[0047] Q1, First switch; Q2, Second switch; Q3, Third switch; Q4, Fourth switch; Q5, Fifth switch; Q6, Sixth switch; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; R5, Fifth resistor; R6, Sixth resistor; R7, Seventh resistor; R8, Eighth resistor; R9, Ninth resistor; R10, Tenth resistor; R11, Eleventh resistor; R12, Twelfth resistor; R13, Thirteenth resistor; R14, Fourteenth resistor; R15, Fifteenth resistor; R16, Sixteenth resistor; R17, Seventeenth resistor; R18, Eighteenth resistor; R19, Nineteenth resistor; R20, Twentieth resistor; R21, 21st resistor; R22, 22nd resistor; D1, 1st diode; D2, 2nd diode; D3, 3rd diode; D4, 4th diode; D5, 5th diode; D6, 6th diode; D7, 7th diode; COMP, comparator; C1, 1st capacitor; C2, 2nd capacitor; PVDD, power voltage; Peak+, 1st output signal; Peak-, 2nd output signal; CMP_OUT, comparator signal; CLIP, indicator signal; CMP_IN+, 1st inverted signal; CMP_IN-, 2nd inverted signal; CMP_OUT_FILTED, stable trigger signal; VTH, threshold voltage. Detailed Implementation

[0048] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0049] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0050] Currently, audio devices (such as smart speakers, computers, smart TVs, car audio systems, Bluetooth speakers, microphones, etc.) typically include power amplifiers to amplify and output audio signals. However, power amplifiers may experience clipping issues during operation. Severe clipping can affect sound quality, cause distortion, and even damage connected devices such as speakers. Therefore, clipping detection of power amplifiers is necessary. Related technologies usually involve setting up a clipping detection circuit for each output of the power amplifier. When there are many power amplifiers, the number of clipping detection circuits also increases, leading to complex circuitry, numerous components, and higher costs.

[0051] Therefore, embodiments of this application provide a clipping detection system and a clipping detection device. The clipping detection system can simultaneously perform clipping detection on multiple power amplifiers, has fewer circuit components, simplifies the circuit, reduces costs, and has high detection reliability.

[0052] The clipping detection system and clipping detection device provided in the embodiments of this application are described below with reference to the accompanying drawings.

[0053] like Figure 1 As shown in the illustration, this application provides a clipping detection device, including a controller 1 and multiple power amplifiers 2. The controller 1 is connected to the multiple power amplifiers 2 and is used to drive the multiple power amplifiers 2 to amplify and output audio signals. The power amplifiers 2 may experience clipping during operation. To detect clipping in the multiple power amplifiers 2, in one example, the clipping detection device provided in this application also includes a clipping detection system 3. The clipping detection system 3 is connected to the controller 1 and the output terminals of the multiple power amplifiers 2. The clipping detection system 3 is used to detect the waveforms output by the multiple power amplifiers 1 and generate corresponding indication signals based on the detection results, which are then output to the controller 1. This allows the controller 1 to drive the power amplifiers 2 accordingly based on the indication signals provided by the clipping detection system 3, thereby adjusting the output of the power amplifiers 2 to reduce clipping and improve the reliability of the power amplifiers 2.

[0054] In this example, the clipping detection system 3 provided in this application is connected to the output terminals of multiple power amplifiers 2 to simultaneously acquire and detect the output waveforms of multiple power amplifiers 2. Thus, this application can simultaneously perform clipping detection on multiple power amplifiers 2 using only one clipping detection system 3, reducing the number of circuit components, simplifying the circuit, and lowering costs.

[0055] In order for the clipping detection system 3 provided in this application to perform clipping detection, in one example, such as Figure 2As shown, the clipping detection system 3 includes an extraction circuit 31, a comparison circuit 32, and a conditioning circuit 33. Multiple input terminals of the extraction circuit 31 are connected to the output terminals of multiple power amplifiers 2. The first input terminal of the comparison circuit 32 is connected to the first output terminal of the extraction circuit 31, and the second input terminal of the comparison circuit 32 is connected to the second output terminal of the extraction circuit 31. The conditioning circuit 33 is connected to the output terminal of the comparison circuit 32 and the controller 1 of the power amplifiers 2.

[0056] The extraction circuit 31 acquires the output waveforms of multiple power amplifiers 2 and extracts the positive and negative peak values ​​of all output channels based on these waveforms. These positive and negative amplitudes are represented by the first output signal Peak+ and the second output signal Peak-, where Peak+ represents the positive peak and Peak- represents the negative peak. The presence of clipping in the positive and negative peak values ​​of the output waveforms can be determined using Peak+ and Peak-. The extraction circuit 31 then outputs the first and second output signals Peak+ and Peak- to a comparator circuit 32. The comparator circuit 32 unifies the Peak+ and Peak- to obtain a unidirectional comparator signal CMP_OUT. The comparator circuit 32 then outputs this unidirectional comparator signal CMP_OUT to a conditioning circuit 33. The conditioning circuit 33 generates a low-voltage normalized indicator signal CLIP based on the CMP_OUT and outputs it to the controller 1, enabling the controller 1 to drive the power amplifiers 2 based on the CLIP indicator signal. It is worth noting that the controller 1 can determine the power amplifier 2 with clipping phenomenon based on the indication signal CLIP provided by the clipping detection system 3, and drive the power amplifier 2 accordingly to adjust the output of the power amplifier 2, reduce the clipping problem, and thus improve the reliability of the power amplifier 2.

[0057] Thus, the clipping detection system 3 provided in this application connects the extraction circuit 31 to the output terminals of multiple power amplifiers 2 to simultaneously acquire and detect the output waveforms of multiple power amplifiers 2. Based on the output waveforms of multiple power amplifiers 2, the positive and negative peak values ​​of all output channels are extracted to determine whether clipping occurs in the positive and negative peak values ​​of the output waveform, resulting in high detection reliability. Then, the comparison circuit 32 and the conditioning circuit 33 generate a corresponding detection signal (i.e., the indication signal CLIP), which enables the controller 1 to drive the power amplifiers 2 based on the indication signal CLIP, thereby adjusting the output of the power amplifiers 2, reducing clipping problems, and improving the reliability and lifespan of the power amplifiers 2. Furthermore, multiple power amplifiers 2 can be simultaneously detected using a single clipping detection system 3, requiring fewer circuit components, simplifying the circuitry, and reducing costs.

[0058] In order for the extraction circuit 31 provided in this application to acquire the output waveforms of multiple power amplifiers 2, in one example, please refer to Figure 3 and Figure 4 As shown, the extraction circuit 31 includes multiple extraction modules 311 and a first resistor R1. Each extraction module 311 includes a second resistor R2, a third resistor R3, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. One end of the second resistor R2 and one end of the third resistor R3 serve as input terminals of the extraction circuit 31 and are connected to the output terminal of the power amplifier 2. The other end of the second resistor R2 is connected to the anode of the first diode D1 and the cathode of the second diode D2. The other end of the third resistor R3 is connected to the anode of the third diode D3 and the cathode of the fourth diode D4. The cathode of the first diode D1 is connected to one end of the first resistor R1 and the cathode of the third diode D3. The anodes of the second diode D2 and the fourth diode D4 are connected to the other end of the first resistor R1. One end of the first resistor R1 serves as the first output terminal of the extraction circuit 31 and is connected to the first input terminal of the comparator circuit 32. The other end of the first resistor R1 serves as the second output terminal of the extraction circuit 31 and is connected to the second input terminal of the comparator circuit 32.

[0059] In this circuit, the first diode D1 and the second diode D2 are connected in a bridge configuration, as are the third diode D3 and the fourth diode D4. Since the power amplifier 2 has a relatively high impedance when connected, to prevent damage to subsequent circuits, the bridge-connected diodes D1, D2, D3, and D4 in the extraction module 311 can perform polarity matching on the output of the power amplifier 2. The first resistor R1 can correspondingly adjust the impedance to avoid excessive impedance causing damage to subsequent circuits, thereby ensuring the reliability of the extraction module 311 and the subsequent circuits.

[0060] In this example, when there are N power amplifiers 2, each power amplifier 2 has two output channels, CH+ and CH-. One output, CH+, is connected to one end of the first resistor R1 via a + physical line to a second resistor R2 and a bridge-connected first diode D1 and second diode D2. At this time, one end of the first resistor R1 serves as the first terminal connected to the first output signal Peak. The other output, CH-, is connected to the other end of the first resistor R1 via a - physical line to a third resistor R3 and a bridge-connected third diode D3 and fourth diode D4. At this time, the other end of the first resistor R1 serves as the second terminal connected to the second output signal Peak-.

[0061] The first terminal is used to detect whether the positive peak value of the first output signal Peak+ is clipped, and the second terminal is used to detect whether the negative peak value of the second output signal Peak- is clipped. When clipping occurs at either the first or the second terminal, the corresponding first and second output signals Peak+ and Peak- connected to the first and second terminals will be converted into high-voltage positive and negative peak trigger pulse signals. After being processed by subsequent circuits (i.e., comparator circuit 32 and conditioning circuit 33), these pulse signals will become the final indicator signal CLIP and be output to controller 1. It is worth noting that the indicator signal CLIP is a low-voltage stable pulse signal generated after processing by comparator circuit 32 and conditioning circuit 33.

[0062] For example, such as Figure 5 As shown, taking the first output channel (CH1) as an example, within the 0-4ms interval, the waveforms of CH1+ and CH1- of the first output channel are stable, meaning there is no clipping phenomenon. Within the 4-6ms interval, the waveform of CH1- of the first output channel is stable, while CH1+ of the first output channel exhibits clipping. At this time, the first output signal Peak+ and the second output signal Peak- will transform into trigger signals, i.e., as shown... Figure 5 The presence of high and low signals indicates that clipping is occurring in the first output channel CH1. Specifically, when clipping occurs at either the first or second terminal, the corresponding first and second output signals Peak+ and Peak- connected to those terminals will be converted into high-voltage positive and negative peak trigger pulse signals.

[0063] High voltage positive and negative peak values ​​may damage or interfere with subsequent circuit components. In order to convert the high voltage positive and negative peak trigger pulse signals (i.e., the first output signal Peak+ and the second output signal Peak-) output by the extraction circuit 31 into a positive pulse output signal, in one example, such as Figure 6 As shown, the comparator circuit 32 includes a first switch Q1, a first threshold module 321, a second switch Q2, a second threshold module 322, a comparator COMP, and a fourth resistor R4.

[0064] In this circuit, the controlled terminal of the first switch Q1 is connected to one end of the third resistor R3 as the first input terminal of the comparator circuit 32. The first terminal of the first switch Q1 is connected to one end of the fourth resistor R4 and connected to the power supply voltage (PVDD). The second terminal of the first switch Q1 is connected to the first terminal of the first threshold module 321, which is grounded. The third terminal of the first threshold module 321 is connected to the inverting input terminal of the comparator COMP. The controlled terminal of the second switch Q2 is connected to the other end of the first resistor R1 as the second input terminal of the comparator circuit 32. The first terminal of the second switch Q2 is connected to the other end of the fourth resistor R4 and grounded. The second terminal of the second switch Q2 is connected to the first terminal of the second threshold module 322, which is connected to the power voltage PVDD. The third terminal of the second threshold module 322 is connected to the non-inverting input terminal of the comparator COMP. The output terminal of the comparator COMP is connected to the conditioning circuit 33 as the output terminal of the comparator circuit 32.

[0065] The first terminal of the first switch Q1 is connected to the power voltage PVDD through the nineteenth resistor R19, and the first terminal of the second switch Q2 is grounded through the twentieth resistor R20. This limits the current flowing through the first switch Q1 and the second switch Q2, and avoids the problem of damage to the first switch Q1 and the second switch Q2 due to excessive current, thereby ensuring the reliability of the first switch Q1 and the second switch Q2.

[0066] In this example, when the extraction circuit 31 detects clipping in the output waveform of the power amplifier 2, the output values ​​of the first output signal Peak+ and the second output signal Peak- of the first switch Q1 and the second switch Q2 are high-voltage positive and negative peak trigger pulse signals, causing both the first switch Q1 and the second switch Q2 to conduct. The first switch Q1 inverts the first output signal Peak+ and adjusts its voltage amplitude to obtain the first inverted signal CMP_IN+, and the second switch Q2 inverts the second output signal Peak- and adjusts its voltage amplitude to obtain the second inverted signal CMP_IN-. For example, as shown... Figure 7As shown, the first inverted signal CMP_IN+ is the inverted signal of the first output signal Peak+. That is, when the first output signal Peak+ is high, its corresponding first inverted signal CMP_IN+ is low, and when the first output signal Peak+ is low, its corresponding first inverted signal CMP_IN+ is high. The second output signal Peak- and the second inverted signal CMP_IN- are similarly processed. The first inverted signal CMP_IN+ and the second inverted signal CMP_IN- are then output to the comparator COMP via the first threshold module 321 and the second threshold module 322 to match the input inversion threshold of the comparator COMP. The comparator COMP generates a comparison signal CMP_OUT based on the first inverted signal CMP_IN+ and the second inverted signal CMP_IN-. This comparison signal CMP_OUT is a positive pulse trigger signal.

[0067] Thus, by using the first switch Q1, the second switch Q2, and the comparator COMP, the high-voltage positive and negative peak trigger pulse signals (i.e., the first output signal Peak+ and the second output signal Peak-) can be converted into a positive pulse output signal (i.e., the comparison signal CMP_OUT), effectively protecting subsequent circuit components. Secondly, direct measurement of positive and negative peaks may introduce certain errors. Converting them into positive pulses allows for more accurate measurement, improving the detection accuracy and reliability of the clipping detection system 3.

[0068] Optionally, the first switch Q1 and the second switch Q2 can be an N-type metal-oxide-semiconductor (NMOS) field-effect transistor, a P-type metal-oxide-semiconductor (PMOS) field-effect transistor, an insulated gate bipolar transistor (IGBT), a transistor, a relay circuit, or other devices or circuits capable of switching on and off. This application does not impose specific limitations on these devices or circuits.

[0069] It is worth noting that the first switch Q1 and the second switch Q2 need to be complementary switches, meaning that the conduction characteristics of the first switch Q1 and the second switch Q2 are opposite. For example, the first switch Q1 in the diagram is a PNP transistor. A PNP transistor requires a negative voltage at its base (i.e., the controlled terminal of the first switch Q1) relative to its emitter (i.e., the first terminal of the first switch Q1) to conduct. The second switch Q2 is an NPN transistor. An NPN transistor requires a positive voltage at its base (i.e., the controlled terminal of the second switch Q2) relative to its emitter (i.e., the first terminal of the second switch Q2) to conduct. The first terminal (emitter of the PNP transistor) and the first terminal (emitter of the NPN transistor) of the first switch Q1 and the second terminal (collector of the PNP transistor) and the second terminal (collector of the NPN transistor) of the first switch Q1 need to be at the same polarity to ensure normal operation when the first switch Q1 and the second switch Q2 have opposite conduction characteristics. Similarly, when the first switch Q1 is an NPN transistor, the second switch Q needs to be a PNP transistor; when the first switch Q1 is an NMOS transistor, the second switch Q needs to be a PMOS transistor. This will not be elaborated further.

[0070] When the extraction circuit 31 detects that the output waveform of the power amplifier 2 does not exhibit clipping, the output values ​​of the first output signal Peak+ and the second output signal Peak- of the first switch Q1 and the second switch Q2 are not high-voltage positive and negative peak trigger pulse signals. At this time, the fourth resistor R4 provides a static operating point, ensuring that the first inverted signal CMP_IN+ and the second inverted signal CMP_IN- maintain a stable static operating point. The comparator COMP will also output a corresponding comparison signal CMP_OUT, indicating that the output waveform of the power amplifier 2 does not exhibit clipping. Thus, by setting the fourth resistor R4, the problem of the comparator COMP failing to output correctly when clipping is absent can be avoided, ensuring the output reliability of the comparator COMP.

[0071] The first threshold module 321 is also used to maintain the first inverted signal CMP_IN+ at a stable static operating point, for example, as shown in... Figure 8 As shown, the first threshold module 321 includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 serves as the first terminal of the first threshold module 321 and is connected to the second terminal of the first switch Q1. The node where the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 serves as the third terminal of the first threshold module 321 and is connected to the inverting input terminal of the comparator COMP. The other end of the sixth resistor R6 serves as the second terminal of the first threshold module 321 and is grounded.

[0072] The second threshold module 322 is also used to maintain the second inverted signal CMP_IN at a stable static operating point, for example, as shown in... Figure 8 As shown, the second threshold module 322 includes a seventh resistor R7 and an eighth resistor R8. One end of the seventh resistor R7 serves as the first terminal of the second threshold module 322 and is connected to the second terminal of the second switch Q2. The node where the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 serves as the third terminal of the second threshold module 322 and is connected to the non-inverting input terminal of the comparator COMP. The other end of the eighth resistor R8 serves as the second terminal of the second threshold module 322 and is connected to the power voltage PVDD.

[0073] In this example, when the first output signal Peak+ and the second output signal Peak- are not high-voltage positive and negative peak trigger pulse signals, neither the first switch Q1 nor the second switch Q2 is turned on. At this time, the first terminal of the first switch Q1 and the first terminal of the second switch Q2 are connected through the fourth resistor R4, and the power voltage PVDD is connected to the ground terminal through the fourth resistor R4. The first inverted signal CMP_IN+ is grounded through the fifth resistor R5 and the sixth resistor R6, and the second inverted signal CMP_IN- is connected to the power voltage PVDD through the seventh resistor R7 and the eighth resistor R8, so that the first inverted signal CMP_IN+ and the second inverted signal CMP_IN- maintain a stable static operating point, so that the comparator COMP can output a stable comparison signal CMP_OUT, thereby ensuring the output reliability of the comparator COMP.

[0074] The comparison signal CMP_OUT output by comparator circuit 32 is a high-frequency fluctuating pulse signal. In order to make the signal output to conditioning circuit 33 a relatively stable trigger signal, in one example, such as Figure 9 As shown, the clipping detection system 3 also includes a filter circuit 34. The first end of the filter circuit 34 is connected to the output end of the comparator circuit 32, the second end of the filter circuit 34 is grounded, and the third end of the filter circuit 34 is connected to the conditioning circuit 33.

[0075] In this example, the filter circuit 34 can filter out high-frequency fluctuation pulses in the comparison signal CMP_OUT, thereby obtaining a stable trigger signal CMP_OUT_FILTED, which is then output to the conditioning circuit 33. The stable trigger signal CMP_OUT_FILTED has had the high-frequency fluctuation pulses in the comparison signal CMP_OUT filtered out, becoming a more stable signal. The filter circuit 34 can significantly improve the signal quality, making the processing or measurement of subsequent circuits more accurate. Secondly, high-frequency pulses may damage or interfere with downstream circuits (such as the conditioning circuit 33 and the controller 1), causing the downstream circuits to malfunction. The filter circuit 34 can effectively protect the components in these downstream circuits from damage, thereby ensuring the operational reliability of the downstream circuits and enhancing the overall operational reliability and stability of the clipping detection system 3.

[0076] In one example, such as Figure 10 As shown, the filter circuit 34 may further include a fifth diode D5, a first capacitor C1, and a sixteenth resistor R16. The positive terminal of the fifth diode D5 is connected to the output terminal of the comparator circuit 32 (i.e., the output terminal of the comparator COMP), the negative terminal of the fifth diode D5 is connected to the first plate of the first capacitor C1, one end of the sixteenth resistor R16, and the conditioning circuit 33, and the second plate of the first capacitor C1 is connected to the other end of the sixteenth resistor R16 via a common ground.

[0077] In this example, such as Figure 11 As shown, the filter circuit 34 filters out high-frequency fluctuation pulses in the comparison signal CMP_OUT, obtaining a stable trigger signal CMP_OUT_FILTED. The positive terminal of the fifth diode D5 is connected to the comparison signal CMP_OUT. The fifth diode D5 has unidirectional conductivity, meaning it only allows current to flow in one direction. The fifth diode D5 blocks the negative half-cycle current in the comparison signal CMP_OUT, allowing only the positive half-cycle to pass, thus extracting the peak value of the signal. The signal is then filtered by the first capacitor C1 and the sixteenth resistor R16 to obtain the stable trigger signal CMP_OUT_FILTED, which is output to the conditioning circuit 33 to prevent high-frequency pulses from damaging or interfering with subsequent circuits.

[0078] Some audio devices that do not require high fidelity can tolerate clipping for a few milliseconds because such clipping usually does not significantly affect the user experience. However, in high-fidelity audio devices, any clipping is considered unacceptable distortion; even millisecond-level clipping can destroy the realism of the audio signal and affect the final listening experience. In another example, such as... Figure 12As shown, the filter circuit 34 may further include a sixth diode D6, a seventh diode D7, a seventeenth resistor R17, an eighteenth resistor R18, and a second capacitor C2. The cathode of the sixth diode D6 is connected to the output terminal of the comparator circuit 32 (i.e., the output terminal of the comparator COMP) and the anode of the seventh diode D7. The anode of the sixth diode D6 is connected to one end of the seventeenth resistor R17. The other end of the seventeenth resistor R17 is connected to the conditioning circuit 33, one end of the eighteenth resistor R18, and the first plate of the second capacitor C2. The other end of the eighteenth resistor R18 is connected to the cathode of the seventh diode D7. The second plate of the second capacitor C2 is grounded.

[0079] In this example, such as Figure 13 As shown, the filter circuit 34 filters out high-frequency fluctuation pulses in the comparison signal CMP_OUT, obtaining a stable trigger signal CMP_OUT_FILTED. To shorten the detection time, the resistance of the seventeenth resistor R17 can be set to a larger value, while the resistance of the eighteenth resistor R18 can be set to a smaller value. The seventeenth and eighteenth resistors R17 and R18 allow the signal edges of the comparison signal CMP_OUT to rise and fall quickly. This means a shorter transition time from low to high (or vice versa), reducing the delay in the propagation and processing of the comparison signal CMP_OUT. This rapid transition allows subsequent circuits to identify the filtered stable trigger signal CMP_OUT_FILTED in a shorter time and output a corresponding indication signal CLIP to the controller 1 based on this stable trigger signal CMP_OUT_FILTED, thereby shortening the detection time and reducing clipping.

[0080] It is worth noting that when the audio device does not require high fidelity, the sixth diode D6, the seventh diode D7, the seventeenth resistor R17, the eighteenth resistor R18, and the second capacitor C2 are only used for filtering the comparison signal CMP_OUT. That is, in this case, the resistance values ​​of the seventeenth resistor R17 and the eighteenth resistor R18 do not need to be set to one larger and one smaller. When the audio device requires high fidelity, the sixth diode D6, the seventh diode D7, the seventeenth resistor R17, the eighteenth resistor R18, and the second capacitor C2 are also used to make the signal edges rise and fall quickly, so as to shorten the detection time while filtering. That is, in this case, the resistance values ​​of the seventeenth resistor R17 and the eighteenth resistor R18 need to be set to one larger and one smaller. The specific settings can be adjusted according to actual needs; this application does not impose specific restrictions on this.

[0081] The stable trigger signal CMP_OUT_FILTED, filtered by filter circuit 34, is output to conditioning circuit 33. Conditioning circuit 33 generates a corresponding indicator signal CLIP based on the stable trigger signal CMP_OUT_FILTED and sends it to controller 1. To retain only clipped trigger signals exceeding a specified time length and improve the reliability of the indicator signal CLIP output to controller 1, in one example, such as... Figure 14 As shown, the conditioning circuit 33 includes a third switch Q3, a fourth switch Q4, a fifth switch Q5, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The controlled terminal of the third switch Q3 is connected to the output terminal of the comparator circuit 32. The first terminal of the third switch Q3 is connected to one end of the ninth resistor R9 and the first terminal of the fourth switch Q4. The other terminal of the ninth resistor R9 is connected to the power voltage PVDD. The controlled terminal of the fourth switch Q4 is connected to the threshold voltage VTH. The second terminal of the third switch Q3 is connected to one end of the tenth resistor R10 and the eleventh resistor R11. The other terminal of the eleventh resistor R11 is connected to the controlled terminal of the fifth switch Q5. The first terminal of the fifth switch Q5, the second terminal of the fourth switch Q4, and the other terminal of the tenth resistor R10 are all connected to ground. The second terminal of the fifth switch Q5 is connected to the controller 1 and one terminal of the twelfth resistor R12. The other terminal of the twelfth resistor R12 is connected to the power supply voltage.

[0082] In this circuit, the third switch Q3 and the fourth switch Q4 form a differential pair to function as a comparator. For example, the diagram shows the third switch Q3 and the fourth switch Q4 as PNP transistors, and the fifth switch Q5 as an NPN transistor. When the stable trigger signal CMP_OUT_FILTED connected to the third switch Q3 is high, the amplitude of CMP_OUT_FILTED exceeds the threshold voltage VTH. Therefore, the third switch Q3 is turned off, the fourth switch Q4 is turned on, the level at the tenth resistor R10 is low, and the corresponding fifth switch Q5 is turned off. At this time, the indicator signal CLIP output to controller 1 is high. Similarly, when the stable trigger signal CMP_OUT_FILTED connected to the third switch Q3 is a low-level signal, the amplitude of the stable trigger signal CMP_OUT_FILTED is lower than the threshold voltage VTH. At this time, the third switch Q3 is turned on and the fourth switch Q4 is turned off. At this time, the tenth resistor R10 is at a high level, and the corresponding fifth switch Q5 is turned on. Then, the indicator signal CLIP output to controller 1 is at a low level.

[0083] In this example, the conditioning circuit 33 can retain the clipping trigger signal in the stable trigger signal CMP_OUT_FILTED that exceeds a specified time length and generate a corresponding indication signal CLIP. For example... Figure 15As shown, when the amplitude of the stable trigger signal VCMP_OUT_FILTED exceeds the threshold voltage VTH, the indicator signal CLIP goes high, representing a valid clipping signal. Controller 1 drives power amplifier 2 based on this indicator signal CLIP to adjust the output of power amplifier 2. When the amplitude of the stable trigger signal VCMP_OUT_FILTED is lower than the threshold voltage VTH, it indicates that the signal is normal, and no clipping occurs in power amplifier 2. Thus, the conditioning circuit 33 compares the stable trigger signal VCMP_OUT_FILTED with the threshold voltage VTH, and then converts the comparison result into a low-voltage signal as the final indicator signal CLIP, which is fed back to controller 1. This allows controller 1 to accurately determine whether clipping occurs in the power amplifier based on the indicator signal CLIP, resulting in high detection reliability and accuracy.

[0084] It is worth noting that when the clipping detection system 3 provided in this application does not include a filter circuit 34, the signal connected to the controlled terminal of the third switch Q3 is the comparison signal CMP_OUT. When the clipping detection system 3 provided in this application includes a filter circuit 34, the signal connected to the controlled terminal of the third switch Q3 is the stable trigger signal VCMP_OUT_FILTED. This application does not impose specific limitations on this.

[0085] Optionally, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 can be NMOS field-effect transistors, PMOS field-effect transistors, IGBTs, transistors, relay circuits, or other devices or circuits capable of switching on and off. This application does not impose specific restrictions on these.

[0086] In one example, such as Figure 14 As shown, the conditioning circuit 33 may further include a twenty-first resistor R21 and a twenty-second resistor R22. One end of the twenty-first resistor R21 is connected to the power voltage PVDD, and the other end of the twenty-first resistor R21, one end of the twenty-second resistor R22, and the controlled terminal of the fourth switch Q4 are connected. The other end of the twenty-second resistor R22 is grounded. In this example, the value of the threshold voltage VTH can be changed by using the twenty-first resistor R21 and the twenty-second resistor R22 to adapt to different power amplifiers 2, offering high flexibility and reliability.

[0087] In another example, such as Figure 16As shown, the conditioning circuit 33 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a sixth switch Q6. One end of the thirteenth resistor R13 is connected to the output terminal of the comparator circuit 32, the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and the controlled terminal of the sixth switch Q6, the first end of the sixth switch Q6 is connected to ground with the other end of the fourteenth resistor R14, the second end of the sixth switch Q6 is connected to one end of the fifteenth resistor R15 and the controller 1, and the other end of the fifteenth resistor R15 is connected to the power supply voltage.

[0088] In this example, such as Figure 17 As shown, the sixth switch Q6 can adjust the high-voltage trigger signal with interference in the stable trigger signal CMP_OUT_FILTED into a low-voltage, regular trigger signal. The low-voltage signal is then fed back to the controller 1 as the final indication signal CLIP. This allows the controller 1 to accurately determine whether the power amplifier has clipping based on the indication signal CLIP, resulting in high detection reliability and accuracy.

[0089] Optionally, the sixth switch Q6 can be an NMOS field-effect transistor, a PMOS field-effect transistor, an IGBT, a transistor, a relay circuit, or other devices or circuits capable of switching on and off. This application does not impose specific restrictions on this.

[0090] Figure 18 and Figure 19 The diagram below illustrates an exemplary overall system of the clipping detection system 3. In summary, the clipping detection system 3 provided in this application connects the extraction circuit 31 to the output terminals of multiple power amplifiers 2 to simultaneously acquire and detect the output waveforms of multiple power amplifiers 2. Based on the output waveforms of the multiple power amplifiers 2, the positive and negative peak values ​​of all output channels are extracted to determine whether clipping occurs in the positive and negative peak values ​​of the output waveform, resulting in high detection reliability. Furthermore, the comparison circuit 32 and conditioning circuit 33 generate a corresponding detection signal (i.e., an indication signal CLIP), which enables the controller 1 to drive the power amplifiers 2 based on the indication signal CLIP, thereby adjusting the output of the power amplifiers 2, reducing clipping problems, and improving the reliability and lifespan of the power amplifiers 2. Moreover, a single clipping detection system 3 can simultaneously detect clipping in multiple power amplifiers 2, requiring fewer circuit components, simplifying the circuitry, and reducing costs.

[0091] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0092] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0093] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A clipping detection system for a power amplifier, characterized in that, The clipping detection system includes: An extraction circuit, wherein multiple input terminals of the extraction circuit are connected to the output terminals of multiple power amplifiers; A comparison circuit, wherein a first input terminal of the comparison circuit is connected to a first output terminal of the extraction circuit, and a second input terminal of the comparison circuit is connected to a second output terminal of the extraction circuit; and, A conditioning circuit is connected to the output of the comparator circuit and the controller of the power amplifier. The extraction circuit is used to obtain a first output signal and a second output signal based on the output waveforms of the multiple power amplifiers and output them to the comparison circuit. The comparison circuit is used to obtain a comparison signal based on the first output signal and the second output signal and output it to the conditioning circuit. The conditioning circuit is used to generate an indication signal based on the comparison signal and output it to the controller, so that the controller drives the power amplifier based on the indication signal.

2. The clipping detection system according to claim 1, characterized in that, The extraction circuit includes multiple extraction modules and a first resistor. Each extraction module includes a second resistor, a third resistor, a first diode, a second diode, a third diode, and a fourth diode. One end of the second resistor and one end of the third resistor are connected to the output of the power amplifier as input terminals of the extraction circuit. The other end of the second resistor is connected to the anode and cathode of the first diode. The other end of the third resistor is connected to the anode of the third diode and the cathode of the fourth diode. The cathode of the first diode is connected to one end of the first resistor and the cathode of the third diode. The anodes of the second diode and the fourth diode are connected to the other end of the first resistor. One end of the first resistor is connected to the first input of the comparison circuit as the first output terminal of the extraction circuit. The other end of the first resistor is connected to the second input of the comparison circuit as the second output terminal of the extraction circuit.

3. The clipping detection system according to claim 2, characterized in that, The comparison circuit includes a first switch, a first threshold module, a second switch, a second threshold module, a comparator, and a fourth resistor; The controlled terminal of the first switch is connected to one end of the first resistor as the first input terminal of the comparator circuit. The first terminal of the first switch is connected to one end of the fourth resistor and connected to the power voltage. The second terminal of the first switch is connected to the first terminal of the first threshold module, and the second terminal of the first threshold module is grounded. The third terminal of the first threshold module is connected to the inverting input terminal of the comparator. The controlled terminal of the second switch is connected to the other end of the first resistor as the second input terminal of the comparator circuit. The first terminal of the second switch and the other end of the fourth resistor are connected to the same ground. The second terminal of the second switch is connected to the first terminal of the second threshold module, and the second terminal of the second threshold module is connected to the power voltage. The third terminal of the second threshold module is connected to the non-inverting input terminal of the comparator. The output terminal of the comparator is connected to the conditioning circuit as the output terminal of the comparator circuit. The first switch and the second switch have opposite conduction characteristics.

4. The clipping detection system according to claim 3, characterized in that, The first threshold module includes a fifth resistor and a sixth resistor. One end of the fifth resistor serves as the first terminal of the first threshold module and is connected to the second terminal of the first switch. The node where the other end of the fifth resistor is connected to one end of the sixth resistor serves as the third terminal of the first threshold module and is connected to the inverting input terminal of the comparator. The other end of the sixth resistor serves as the second terminal of the first threshold module and is grounded. And / or, The second threshold module includes a seventh resistor and an eighth resistor. One end of the seventh resistor serves as the first end of the second threshold module and is connected to the second end of the second switch. The node where the other end of the seventh resistor is connected to one end of the eighth resistor serves as the third end of the second threshold module and is connected to the non-inverting input of the comparator. The other end of the eighth resistor serves as the second end of the second threshold module and is connected to the power voltage.

5. The clipping detection system according to claim 1, characterized in that, The conditioning circuit includes a third switch, a fourth switch, a fifth switch, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The controlled terminal of the third switch is connected to the output terminal of the comparator circuit. The first terminal of the third switch is connected to one end of the ninth resistor and the first terminal of the fourth switch. The other end of the ninth resistor is connected to a power voltage. The controlled terminal of the fourth switch is connected to a threshold voltage. The second terminal of the third switch is connected to one end of the tenth resistor and one end of the eleventh resistor. The other end of the eleventh resistor is connected to the controlled terminal of the fifth switch. The first terminal of the fifth switch, the second terminal of the fourth switch, and the other end of the tenth resistor are all connected to a common ground. The second terminal of the fifth switch is connected to the controller and one end of the twelfth resistor. The other end of the twelfth resistor is connected to a power supply voltage.

6. The clipping detection system according to claim 1, characterized in that, The conditioning circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixth switch; One end of the thirteenth resistor is connected to the output terminal of the comparator circuit, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor and the controlled terminal of the sixth switch, the first end of the sixth switch and the other end of the fourteenth resistor are connected to the same ground, the second end of the sixth switch is connected to one end of the fifteenth resistor and the controller, and the other end of the fifteenth resistor is connected to the power supply voltage.

7. The clipping detection system according to any one of claims 1-6, characterized in that, The clipping detection system also includes: A filter circuit is provided, wherein the first terminal of the filter circuit is connected to the output terminal of the comparator circuit, the second terminal of the filter circuit is grounded, and the third terminal of the filter circuit is connected to the conditioning circuit.

8. The clipping detection system according to claim 7, characterized in that, The filter circuit includes a fifth diode, a first capacitor, and a sixteenth resistor; The positive terminal of the fifth diode is connected to the output terminal of the comparator circuit, the negative terminal of the fifth diode is connected to the first plate of the first capacitor, one end of the sixteenth resistor, and the conditioning circuit, and the second plate of the first capacitor is connected to the other end of the sixteenth resistor.

9. The clipping detection system according to claim 7, characterized in that, The filter circuit includes a sixth diode, a seventh diode, a seventeenth resistor, an eighteenth resistor, and a second capacitor; The negative terminal of the sixth diode is connected to the output terminal of the comparator circuit and the positive terminal of the seventh diode. The positive terminal of the sixth diode is connected to one end of the seventeenth resistor. The other end of the seventeenth resistor is connected to the conditioning circuit, one end of the eighteenth resistor, and the first plate of the second capacitor. The other end of the eighteenth resistor is connected to the negative terminal of the seventh diode. The second plate of the second capacitor is grounded.

10. A clipping detection device, characterized in that, include: Multiple power amplifiers; Controller; as well as, The clipping detection system according to any one of claims 1-9, wherein the clipping detection system is connected to the controller and the output terminals of the plurality of power amplifiers.

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