Anti-howling audio processing module

Abstract

This utility model relates to an anti-feedback audio processing module, comprising: a power supply unit, an analog audio input unit, an analog-to-digital converter (ADC), a feedback suppression unit, a gain adjustment unit, an analog audio output unit, and a mute unit. The analog audio input unit is connected to the ADC, receives external analog audio input, outputs it to the ADC, and converts it into digital audio output. The feedback suppression unit is connected to the ADC, performs digital-to-analog conversion on the digital audio output, and suppresses the feedback signal. The gain adjustment unit is connected to the feedback suppression unit and the analog audio output unit, adjusts the gain of the analog audio output, and outputs it through the analog audio output unit. The mute unit is connected to the analog audio output unit and the feedback suppression unit to bypass the analog audio output of the analog audio output unit. Implementing this utility model can conveniently and quickly achieve anti-feedback in audio links under different application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of audio technology, and more specifically, to an anti-feedback audio processing module. Background Technology

[0002] Traditional feedback suppressors require a mixing console, and audio processors need professional tuning. Shock protection is typically built into high-end amplifiers and cannot be used independently. This makes it difficult to achieve feedback suppression in temporary conference systems, which are prone to feedback due to environmental changes. Furthermore, in practical applications, traditional audio output circuits are susceptible to power-on / off shocks and sudden voltage fluctuations, failing to protect against operational anomalies (such as DC offset due to op-amp failure, overload or undervoltage) that could damage the equipment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an anti-feedback audio processing module, which addresses the aforementioned technical defects of the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an anti-feedback audio processing module, including: a power supply unit for providing working voltage, and an analog audio input unit, an analog-to-digital conversion unit, a feedback suppression unit, a gain adjustment unit, an analog audio output unit, and a mute unit;

[0005] The analog audio input unit is connected to the analog-to-digital conversion unit and is used to receive external analog audio input and output it to the analog-to-digital conversion unit, so that the external analog audio input can be converted into digital audio output by the analog-to-digital conversion unit;

[0006] The feedback suppression unit is connected to the analog-to-digital conversion unit and is used to perform digital-to-analog conversion on the digital audio output and perform howling signal suppression processing to obtain analog audio output.

[0007] The gain adjustment unit is connected to the feedback suppression unit and the analog audio output unit, and is used to adjust the gain of the analog audio output, and output the adjusted analog audio output to an external audio playback device through the analog audio output unit.

[0008] The mute unit is connected to the analog audio output unit and the feedback suppression unit, and is used to receive the control level output by the feedback suppression unit to bypass the analog audio output of the analog audio output unit to the external audio playback device.

[0009] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the analog audio output unit includes a single-ended to differential conversion circuit and an output interface circuit;

[0010] The input terminal of the single-ended to differential converter circuit is connected to the output terminal of the gain adjustment unit. The output terminal of the single-ended to differential converter circuit is connected to the input terminal of the mute unit and the input terminal of the output interface circuit. The output terminal of the output interface circuit is used to connect to the external audio playback device.

[0011] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the mute unit includes a POP sound suppressor U9, resistors R77, R78, R79, and R80, and capacitors C84, C85, C87, and C88.

[0012] The INL terminal of the POP sound suppressor U9 is connected to the first differential output terminal of the single-ended to differential conversion circuit, and the INR terminal of the POP sound suppressor U9 is connected to the second differential output terminal of the single-ended to differential conversion circuit.

[0013] The UVP terminal of the POP sound suppressor U9 is connected to the first terminal of the resistor R77, the first terminal of the resistor R78, and the first terminal of the capacitor C84. The second terminal of the resistor R77 is connected to the power supply unit, and the second terminals of the resistor R78 and the second terminals of the capacitor C84 are grounded.

[0014] The MUTE terminal of the POP sound suppressor U9 is connected to the first terminal of the capacitor C85, the first terminal of the resistor R79, and the first terminal of the resistor R80. The second terminal of the resistor R79 is connected to the control level output terminal of the feedback suppression unit. The second terminals of the capacitor C85 and the second terminals of the resistor R80 are grounded.

[0015] The CPB terminal of the POP sound suppressor U9 is grounded via the capacitor C88, and the SET terminal of the POP sound suppressor U9 is grounded via the capacitor C87.

[0016] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the single-ended to differential conversion circuit includes an operational amplifier chip U3, resistors R67, R68, R69, R70, R71, R72, R73, capacitors C82 and C83.

[0017] The first pin of the operational amplifier chip U3 is connected to the first end of the resistor R75, the first end of the resistor R73 and the first end of the capacitor C83, and the second pin of the operational amplifier chip U3 is connected to the second end of the resistor R73, the second end of the capacitor C83 and the first end of the resistor R72.

[0018] The seventh pin of the operational amplifier chip U3 is connected to the first end of the resistor R70, the first end of the resistor R67, the first end of the capacitor C82, and the second end of the resistor R72. The sixth pin of the operational amplifier chip U3 is connected to the second end of the resistor R67, the second end of the capacitor C82, and the first end of the resistor R68. The second end of the resistor R68 is connected to the output terminal of the gain adjustment unit.

[0019] The second end of resistor R70 is connected to the first end of resistor R71 and the first end of resistor R69. The second end of resistor R69 is the first differential output terminal of the single-ended to differential conversion circuit.

[0020] The second end of resistor R75 is connected to the first end of resistor R76 and the first end of resistor R74, and the second end of resistor R74 is the second differential output terminal of the single-ended to differential conversion circuit.

[0021] The third and fifth pins of the operational amplifier chip U3, the second terminal of the resistor R71, and the second terminal of the resistor R76 are grounded.

[0022] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the output interface circuit includes resistor R81, resistor R82, capacitor C89, capacitor C93, capacitor C90, inductor L3, inductor L4, capacitor C91, capacitor C92, capacitor C94, capacitor C95, connector J5, connector J6 and connector J7.

[0023] The first end of resistor R81, the first end of capacitor C89, and the first end of inductor L3 are connected to the first differential output terminal of the single-ended to differential converter circuit; the first end of resistor R82, the first end of capacitor C93, and the first end of inductor L4 are connected to the second differential output terminal of the single-ended to differential converter circuit.

[0024] The second end of the inductor L3 is connected to the first end of the capacitor C91, the second pin of the connector J5, the first end of the capacitor C94, the first end of the connector J6, and the third pin of the connector J7.

[0025] The second end of the inductor L4 is connected to the first end of the capacitor C92, the third pin of the connector J5, the first end of the capacitor C95, the second end of the connector J6, and the second pin of the connector J7.

[0026] The second terminal of capacitor C89 is connected to the second terminal of capacitor C93 and the first terminal of capacitor C90. The second terminals of resistor R81, resistor R82, capacitor C90, capacitor C91, capacitor C92, capacitor C94, capacitor C95, the first and fourth pins of connector J5, the third terminal of connector J6, and the first pin of connector J7 are grounded respectively.

[0027] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the analog audio input unit includes a differential to single-ended conversion circuit and an input interface circuit;

[0028] The input terminal of the input interface circuit is used for the external analog audio input;

[0029] The input terminal of the differential-to-single-ended converter circuit is connected to the output terminal of the input interface circuit, and the output terminal of the differential-to-single-ended converter circuit is connected to the input terminal of the analog-to-digital converter unit.

[0030] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the differential to single-ended conversion circuit includes an operational amplifier chip U1, resistors R19, R20, R21, R22, capacitors C39, C40, and C42.

[0031] The first pin of the operational amplifier chip U1 is connected to the second pin of the operational amplifier chip U1 and the first end of the resistor R20, and the third pin of the operational amplifier chip U1 is connected to the first signal output terminal of the input interface circuit.

[0032] The sixth pin of the operational amplifier chip U1 is connected to the second end of the resistor R20, the first end of the resistor R19, and the first end of the capacitor C39; the fifth pin of the operational amplifier chip U1 is connected to the first end of the resistor R21, the first end of the resistor R22, and the first end of the resistor C42; and the seventh pin of the operational amplifier chip U1 is connected to the first end of the capacitor C40, the second end of the resistor R19, and the second end of the capacitor C39.

[0033] The second end of the resistor R21 is connected to the second signal output terminal of the input interface circuit, and the second end of the capacitor C40 is the output terminal of the differential to single-ended conversion circuit.

[0034] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the input interface circuit includes: capacitor C29, capacitor C30, capacitor C31, capacitor C32, capacitor C33, capacitor C34, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, connector J2, connector J3, and connector J4;

[0035] The first end of capacitor C30 is connected to the second pin of connector J3, the third pin of connector J4 and the first end of capacitor C29; the second end of capacitor C30 is connected to the third pin of connector J3, the second pin of connector J4 and the first end of capacitor C31.

[0036] The second end of capacitor C29 is connected to the first end of connector J3, the first end of resistor R12, the first end of capacitor C33 and the first end of resistor R17; the second end of capacitor C31 is connected to the second end of connector J3, the first end of resistor R16, the first end of capacitor C32 and the first end of resistor R18.

[0037] The second end of resistor R12 is connected to the first end of resistor R14 and the first end of resistor R13 and serves as the first signal output terminal of the input interface circuit. The second end of resistor R16 is connected to the second end of resistor R14 and the first end of resistor R15 and serves as the second signal output terminal of the input interface circuit.

[0038] The second ends of resistor R13 and resistor R15 are connected to the ground of the processing module. The first pin of connector J2, the third end of connector J3, the first pin of connector J4, the second end of capacitor C33, the second end of capacitor C32, the second end of resistor R17, and the second end of resistor R18 are connected to the ground of the external device. The ground of the external device is connected to the ground of the processing module through capacitor C34.

[0039] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the gain adjustment unit includes a first operational amplifier circuit, a DIP switch circuit, a second operational amplifier circuit, and a rotary switch circuit;

[0040] The first input terminal of the first operational amplifier circuit is connected to the first signal output terminal of the feedback suppression unit, the second input terminal of the first operational amplifier circuit is connected to the second signal output terminal of the feedback suppression unit, the output terminal of the first operational amplifier circuit is connected to the input terminal of the DIP switch circuit, the output terminal of the DIP switch circuit is connected to the first input terminal of the second operational amplifier circuit, the second input terminal of the second operational amplifier circuit is grounded, the output terminal of the second operational amplifier circuit is connected to the third terminal of the rotary switch circuit, the second terminal of the rotary switch circuit is the output terminal of the gain adjustment unit, and the first terminal of the rotary switch circuit is grounded.

[0041] Preferably, in one embodiment of the anti-feedback audio processing module of this utility model, the first operational amplifier circuit includes a chip U2A, capacitors C60 and C61, resistors R52 and R54, capacitors C62 and C64, resistors R55 and C59, and resistor R51; the second pin of the chip U2A is connected to the first terminal of resistor R52, the first terminal of capacitor C62, the first terminal of resistor R51, and the first terminal of capacitor C59; the third pin of the chip U2A is connected to the first terminal of resistor R54, the second terminal of capacitor C62, and the third terminal of capacitor R59. The first terminal of resistor R55 is connected to the first terminal of capacitor C64. The second terminal of resistor R52 is connected to the first terminal of capacitor C60, and the second terminal of capacitor C60 is the first input terminal of the first operational amplifier circuit. The second terminal of resistor R54 is connected to the first terminal of capacitor C61, and the second terminal of capacitor C61 is the second input terminal of the first operational amplifier circuit. The second terminals of capacitor C64 and resistor R55 are grounded. The first pin of chip U2A is connected to the second terminal of resistor R51 and the second terminal of capacitor C59, and serves as the output terminal of the first operational amplifier circuit.

[0042] and / or

[0043] The DIP switch circuit includes a DIP switch SW1, resistors R60, R61, R62, R63, R64, R65, capacitors C71, C72, and C73. The third pin of the DIP switch SW1 is the input terminal of the circuit. The first pin of the DIP switch SW1 is connected to the first terminal of resistor R65 and the first terminal of capacitor C73. The second pin of the DIP switch SW1 is connected to the first terminal of resistor R63 and the first terminal of capacitor C72. The fourth pin of the DIP switch SW1 is connected to the first terminal of resistor R64 and the first terminal of capacitor C71. The second terminal of capacitor C71 is connected to the first terminal of resistor R60, the second terminal of capacitor C72 is connected to the first terminal of resistor R61, and the second terminal of capacitor C73 is connected to the first terminal of resistor R62. The second terminals of resistors R60 and R61 are the output terminals of the DIP switch circuit; and / or

[0044] The second operational amplifier circuit includes a chip U2B, a resistor R59, a capacitor C70, a resistor R66, a capacitor C76, a capacitor C77, and a capacitor C74. The sixth pin of the chip U2B is connected to the output terminal of the DIP switch circuit, the first terminal of the capacitor C76, the first terminal of the capacitor C70, and the first terminal of the resistor R59. The fifth pin of the chip U2B is connected to the second terminal of the capacitor C76, the first terminal of the capacitor C77, and the first terminal of the resistor R66. The seventh pin of the chip U2B is connected to the second terminal of the capacitor C70, the second terminal of the resistor R59, and the first terminal of the capacitor C74. The second terminal of the capacitor C74 is the output terminal of the second operational amplifier circuit. The second terminals of the capacitor C77 and the second terminals of the resistor R66 are grounded.

[0045] The anti-feedback audio processing module of this utility model has the following beneficial effects: it can conveniently and quickly realize audio link anti-feedback in different application scenarios. Attached Figure Description

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0047] Figure 1 This is a logic block diagram of an embodiment of an anti-feedback audio processing module of this utility model;

[0048] Figure 2 This is a partial circuit schematic diagram of an anti-feedback audio processing module according to this utility model;

[0049] Figure 3 This is a partial circuit schematic diagram of an anti-feedback audio processing module according to this utility model;

[0050] Figure 4 This is a partial circuit schematic diagram of an anti-feedback audio processing module according to this utility model;

[0051] Figure 5 This is the logic block diagram of the existing feedback suppression module;

[0052] Figure 6 This is a partial circuit schematic diagram of an anti-feedback audio processing module according to this utility model;

[0053] Figure 7 This is a partial circuit diagram of an anti-feedback audio processing module according to this utility model. Detailed Implementation

[0054] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0055] like Figure 1 The image shows an embodiment of an anti-feedback audio processing module according to this utility model. Figure 1 An embodiment of the anti-feedback audio processing module of the present invention shown includes: a power supply unit (not shown) for providing operating voltage, and an analog audio input unit 120, an analog-to-digital converter unit 130, a feedback suppression unit 140, a gain adjustment unit 150, an analog audio output unit 160, and a mute unit 170; the analog audio input unit 120 is connected to the analog-to-digital converter unit 130, and is used to receive external analog audio input and output it to the analog-to-digital converter unit 130, so that the external analog audio input is converted into digital audio output by the analog-to-digital converter unit 130; the feedback suppression unit 140 is connected to the analog-to-digital converter unit 160. Unit 130 is used to perform digital-to-analog conversion on the digital audio output and to suppress howling signals to obtain analog audio output; gain adjustment unit 150 is connected to feedback suppression unit 140 and analog audio output unit 160, and is used to adjust the gain of analog audio output, and output the adjusted analog audio output to an external audio playback device through analog audio output unit 160; mute unit 170 is connected to analog audio output unit 160 and feedback suppression unit 140, and is used to receive the control level output by feedback suppression unit 140 to bypass the analog audio output of analog audio output unit 160 to the external audio playback device.

[0056] Specifically, in the anti-feedback audio processing module (hereinafter referred to as the processing module), the power supply unit is used to provide operating voltage to the various working circuits inside the processing module. In one embodiment, the power supply unit can be connected to an external power supply or a power supply from an upstream circuit through various interfaces, and the voltage can be converted by various internal voltage conversion modules or circuits to obtain the operating voltage required by the processing module.

[0057] The analog audio input unit 120 receives analog audio signals generated by other audio modules or devices (corresponding to external analog audio input). The analog audio signal is then converted to a digital audio signal (corresponding to digital audio output) by the analog-to-digital converter unit 130. Figure 2 As shown, in one embodiment, the analog-to-digital conversion unit 130 may include an analog-to-digital conversion chip U8 and its peripheral circuitry. The feedback suppression unit 140 performs digital-to-analog conversion on the digital audio output and performs feedback signal suppression processing to obtain the corresponding analog audio output. This analog audio output is then adjusted by the gain adjustment unit 150 and output to the next-level device for audio playback via the analog audio output unit 160. The mute unit 170 is used to bypass the output of the analog audio output unit 160 according to the control signal output by the feedback suppression unit 140 to prevent feedback from occurring when the external audio playback device plays the analog audio output.

[0058] like Figure 3 As shown, in one embodiment, the analog audio output unit 160 includes a single-ended to differential converter circuit 161 and an output interface circuit 162. The input terminal of the single-ended to differential converter circuit 161 is connected to the output terminal of the gain adjustment unit 150, and the output terminal of the single-ended to differential converter circuit 161 is connected to the input terminal of the mute unit 170 and the input terminal of the output interface circuit 162. The output terminal of the output interface circuit 162 is used to connect to an external audio playback device. Specifically, in the analog audio output unit 160, the signal output by the gain adjustment unit 150 is first converted into a differential signal by the single-ended to differential converter circuit 161, and then output to the corresponding external audio playback device through the output interface circuit 162. The mute unit 170 is connected between the single-ended to differential converter circuit 161 and the output interface circuit 162 to mute the output of the single-ended to differential converter circuit 161 to prevent feedback audio from entering other devices through the output interface circuit 162. It can be understood that the output interface circuit 162 can be configured according to the type of device to be connected.

[0059] In one specific embodiment, the mute unit 170 includes a pop-tone suppressor U9, resistors R77, R78, R79, and R80, and capacitors C84, C85, C87, and C88. The INL terminal of the pop-tone suppressor U9 is connected to the first differential output terminal of a single-ended to differential converter circuit, and the INR terminal of the pop-tone suppressor U9 is connected to the second differential output terminal of the single-ended to differential converter circuit. The UVP terminal of the pop-tone suppressor U9 is connected to the first terminals of resistors R77 and R78, and capacitor C84. The first terminal of the POP sound suppressor U9 has its second terminal connected to the power supply unit, and the second terminals of resistor R78 and capacitor C84 are grounded. The MUTE terminal of the POP sound suppressor U9 is connected to the first terminals of capacitor C85, resistor R79, and resistor R80. The second terminal of resistor R79 is connected to the control level output terminal of the feedback suppression unit 140, and the second terminals of capacitor C85 and resistor R80 are grounded. The CPB terminal of the POP sound suppressor U9 is grounded via capacitor C88, and the SET terminal is grounded via capacitor C87. Specifically, when the mute condition is triggered, the mute unit 170 generates a low-impedance path to ground, bypassing and shunting the abnormal audio signal current to ground, ensuring that abnormal current surge noise does not travel to subsequent stages. In actual operation, the POP sound suppressor U9 ensures that the output of the single-ended to differential converter circuit 161 is allowed to be output externally through the output interface circuit 162 only when the power supply unit is working normally, reducing howling noise during playback. Meanwhile, the POP tone suppressor U9 can also control the bypass process according to the control level received by its MUTE pin, so as to shut down the output of the single-ended to differential conversion circuit 161 through the output interface circuit 162 as needed.

[0060] like Figure 4 As shown, the feedback suppression unit 140 includes a feedback suppression module for use in EKO's aires-a series processors, supporting four-input four-output audio signal processing. For example... Figure 5 As shown, this feedback suppression module integrates a signal processing unit, a frequency analysis unit, a dynamic filtering unit, and a signal control unit to achieve feedback suppression of audio signals. Here, the feedback suppression unit 140 uses an existing module, and its specific operation can be implemented based on the existing operation of feedback suppression modules, which will not be emphasized here.

[0061] In one specific embodiment, the single-ended to differential conversion circuit 161 includes an operational amplifier chip U3, resistors R67, R68, R69, R70, R71, R72, R73, capacitors C82 and C83; the first pin of the operational amplifier chip U3 is connected to the first terminals of resistors R75, R73, and C83; the second pin of the operational amplifier chip U3 is connected to the second terminal of resistor R73, C83, and R72; the seventh pin of the operational amplifier chip U3 is connected to the first terminals of resistors R70, R67, C82, and R72. Pin 6 of chip U3 is connected to the second terminal of resistor R67, the second terminal of capacitor C82, and the first terminal of resistor R68. The second terminal of resistor R68 is connected to the output terminal of gain adjustment unit 150. The second terminal of resistor R70 is connected to the first terminal of resistor R71 and the first terminal of resistor R69. The second terminal of resistor R69 is the first differential output terminal of single-ended to differential converter circuit. The second terminal of resistor R75 is connected to the first terminal of resistor R76 and the first terminal of resistor R74. The second terminal of resistor R74 is the second differential output terminal of single-ended to differential converter circuit 161. Pins 3 and 5 of operational amplifier chip U3, the second terminal of resistor R71, and the second terminal of resistor R76 are grounded. Specifically, the analog audio signal after gain adjustment is converted into a differential balanced signal by single-ended to differential converter circuit 161 and transmitted to the subsequent equipment.

[0062] In one specific embodiment, the output interface circuit 162 includes resistors R81 and R82, capacitors C89, C93, and C90, inductors L3 and L4, capacitors C91, C92, C94, and C95, and connectors J5, J6, and J7. The first ends of resistors R81, C89, and L3 are connected to the first differential output terminal of the single-ended to differential converter circuit 161. The first ends of resistors R82, C93, and L4 are connected to the second differential output terminal of the single-ended to differential converter circuit 161. The second end of inductor L3 is connected to the first end of capacitor C91 and the second pin of connector J5. The first terminal of capacitor C94, the first terminal of connector J6, and the third pin of connector J7 are connected; the second terminal of inductor L4 is connected to the first terminal of capacitor C92, the third pin of connector J5, the first terminal of capacitor C95, the second terminal of connector J6, and the second pin of connector J7; the second terminal of capacitor C89 is connected to the second terminal of capacitor C93 and the first terminal of capacitor C90; the second terminals of resistor R81, resistor R82, capacitor C90, capacitor C91, capacitor C92, capacitor C94, capacitor C95, the first and fourth pins of connector J5, the third terminal of connector J6, and the first pin of connector J7 are grounded. Specifically, the output interface circuit 162 is equipped with various connectors to match different downstream audio devices.

[0063] like Figure 6 As shown, the analog audio input unit 120 includes a differential-to-single-ended converter circuit 122 and an input interface circuit 121. The input terminal of the input interface circuit 121 is used for external analog audio input. The input terminal of the differential-to-single-ended converter circuit 122 is connected to the output terminal of the input interface circuit, and the output terminal of the differential-to-single-ended converter circuit 122 is connected to the input terminal of the analog-to-digital converter unit 130. Specifically, this processing module connects to an external analog audio input through the input interface circuit 121, and converts the analog audio input into a single-ended audio signal through the differential-to-single-ended converter circuit 122 before inputting it to the analog-to-digital converter unit 130 for analog-to-digital conversion.

[0064] In one specific embodiment, the differential-to-single-ended converter circuit 122 includes an operational amplifier chip U1, resistors R19, R20, R21, and R22, and capacitors C39, C40, and C42. The first pin of the operational amplifier chip U1 is connected to the second pin of the operational amplifier chip U1 and the first terminal of resistor R20. The third pin of the operational amplifier chip U1 is connected to the first signal output terminal of the input interface circuit. The sixth pin of the operational amplifier chip U1 is connected to the second terminal of resistor R20, the first terminal of resistor R19, and the first terminal of capacitor C39. The fifth pin of the operational amplifier chip U1 is connected to the first terminals of resistors R21, R22, and C42. The seventh pin of the operational amplifier chip U1 is connected to the first terminal of capacitor C40, the second terminal of resistor R19, and the second terminal of capacitor C39. The second terminal of resistor R21 is connected to the second signal output terminal of the input interface circuit, and the second terminal of capacitor C40 is the output terminal of the differential-to-single-ended converter circuit 122. Specifically, the analog audio input is mixed using a differential-to-single-ended converter circuit 122, and the mixed signal is then processed.

[0065] In one specific embodiment, the input interface circuit 121 includes: capacitors C29, C30, C31, C32, C33, and C34; resistors R12, R13, R14, R15, R16, R17, and R18; connectors J2, J3, and J4; the first end of capacitor C30 is connected to the second pin of connector J3, the third pin of connector J4, and the first end of capacitor C29; the second end of capacitor C30 is connected to the third pin of connector J3, the second pin of connector J4, and the first end of capacitor C31; the second end of capacitor C29 is connected to the first end of connector J3, the first end of resistor R12, the first end of capacitor C33, and the first end of resistor R17; and the second end of capacitor C31 is connected to... The second end of connector J3, the first end of resistor R16, the first end of capacitor C32, and the first end of resistor R18 are connected. The second end of resistor R12 is connected to the first ends of resistors R14 and R13 and serves as the first signal output terminal of the input interface circuit. The second end of resistor R16 is connected to the second ends of resistors R14 and R15 and serves as the second signal output terminal of the input interface circuit. The second ends of resistors R13 and R15 are connected to the ground of the processing module. The first pin of connector J2, the third end of connector J3, the first pin of connector J4, the second ends of capacitors C33 and C32, the second ends of resistors R17 and R18 are connected to the ground of the external device. The ground of the external device is connected to the ground of the processing module through capacitor C34. Specifically, the input interface circuit 121 is equipped with various connectors to match different upstream audio devices. Simultaneously, the ground of the upstream audio device is isolated from the internal ground in this embodiment through an isolation capacitor.

[0066] In one embodiment, such as Figure 7 As shown, the gain adjustment unit 150 includes a first operational amplifier circuit 151, a DIP switch circuit 152, a second operational amplifier circuit 153, and a rotary switch circuit 154. The first input terminal of the first operational amplifier circuit 151 is connected to the first signal output terminal of the feedback suppression unit 140, and the second input terminal of the first operational amplifier circuit 151 is connected to the second signal output terminal of the feedback suppression unit 140. The output terminal of the first operational amplifier circuit 151 is connected to the input terminal of the DIP switch circuit 152, and the output terminal of the DIP switch circuit 152 is connected to the first input terminal of the second operational amplifier circuit 153. The second input terminal of the second operational amplifier circuit 153 is grounded, and the output terminal of the second operational amplifier circuit 153 is connected to the third terminal of the rotary switch circuit 154. The second terminal of the rotary switch circuit 153 is the output terminal of the gain adjustment unit 150, and the first terminal of the rotary switch circuit 154 is grounded. Specifically, the gain adjustment unit 150 mixes and amplifies the audio signal processed by the feedback suppression module. The specific process involves adjusting the volume using the DIP switch and / or the rotary switch.

[0067] In one embodiment, the first operational amplifier circuit 151 includes a chip U2A, capacitors C60 and C61, resistors R52 and R54, capacitors C62 and C64, resistors R55 and C59, and resistor R51. The second pin of chip U2A is connected to the first terminals of resistors R52, C62, R51, and C59. The third pin of chip U2A is connected to the first terminals of resistors R54, C62, R55, and C64. The second terminal of resistor R52 is connected to the first terminal of capacitor C60, which is the first input terminal of the first operational amplifier circuit 151. The second terminal of resistor R54 is connected to the first terminal of capacitor C61, which is the second input terminal of the first operational amplifier circuit. The second terminals of capacitor C64 and R55 are grounded. The first pin of chip U2A is connected to the second terminals of resistor R51 and C59, and serves as the output terminal of the first operational amplifier circuit 151.

[0068] In one embodiment, the DIP switch circuit 152 includes a DIP switch SW1, resistors R60, R61, R62, R63, R64, R65, capacitors C71, C72, and C73. The third pin of the DIP switch SW1 is the input terminal of the DIP switch circuit 152. The first pin of the DIP switch SW1 is connected to the first end of resistor R65 and the first end of capacitor C73. The second pin of the DIP switch SW1 is connected to the first end of resistor R63 and the first end of capacitor C72. The fourth pin of the DIP switch SW1 is connected to the first end of resistor R64 and the first end of capacitor C71. The second end of capacitor C71 is connected to the first end of resistor R60, the second end of capacitor C72 is connected to the first end of resistor R61, and the second end of capacitor C73 is connected to the first end of resistor R62. The second ends of resistors R60 and R61 are the output terminals of the DIP switch circuit 152. That is, the gain of the second operational amplifier circuit 153 is matched by the DIP switch circuit 152 in order to achieve the final adjustment of the signal gain.

[0069] In one embodiment, the second operational amplifier circuit 153 includes chip U2B, resistor R59, capacitor C70, resistor R66, capacitor C76, capacitor C77, and capacitor C74. The sixth pin of chip U2B is connected to the output terminal of the DIP switch circuit, the first terminal of capacitor C76, the first terminal of capacitor C70, and the first terminal of resistor R59. The fifth pin of chip U2B is connected to the second terminal of capacitor C76, the first terminal of capacitor C77, and the first terminal of resistor R66. The seventh pin of chip U2B is connected to the second terminal of capacitor C70, the second terminal of resistor R59, and the first terminal of capacitor C74. The second terminal of capacitor C74 is the output terminal of the second operational amplifier circuit. The second terminals of capacitor C77 and resistor R66 are grounded. In one embodiment, chip U2A and chip U2B are the same chip.

[0070] Through the above embodiments, the anti-feedback audio processing module of this utility model can mute the entire audio system when the overall audio system is unstable, experiences abnormal voltage fluctuations, or requires software control. This prevents various current surge noises caused by abnormal conditions such as device power-on / off, timing errors, or excessive load leading to voltage instability, which could even damage downstream equipment. Furthermore, this processing module monitors the audio system link status in real time with ultra-low latency (110ns), a latency that cannot be obtained through manual operation of a mixing console.

[0071] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An anti-howling audio processing module, characterized in that, include: The unit provides the operating voltage, and includes an analog audio input unit, an analog-to-digital converter, a feedback suppression unit, a gain adjustment unit, an analog audio output unit, and a mute unit. The analog audio input unit is connected to the analog-to-digital conversion unit and is used to receive external analog audio input and output it to the analog-to-digital conversion unit, so that the external analog audio input can be converted into digital audio output by the analog-to-digital conversion unit; The feedback suppression unit is connected to the analog-to-digital conversion unit and is used to perform digital-to-analog conversion on the digital audio output and perform howling signal suppression processing to obtain analog audio output. The gain adjustment unit is connected to the feedback suppression unit and the analog audio output unit, and is used to adjust the gain of the analog audio output, and output the adjusted analog audio output to an external audio playback device through the analog audio output unit. The mute unit is connected to the analog audio output unit and the feedback suppression unit, and is used to receive the control level output by the feedback suppression unit to bypass the analog audio output of the analog audio output unit to the external audio playback device.

2. The anti-howling audio processing module according to claim 1, characterized in that, The analog audio output unit includes a single-ended to differential converter circuit and an output interface circuit. The input terminal of the single-ended to differential converter circuit is connected to the output terminal of the gain adjustment unit. The output terminal of the single-ended to differential converter circuit is connected to the input terminal of the mute unit and the input terminal of the output interface circuit. The output terminal of the output interface circuit is used to connect to the external audio playback device.

3. The anti-howling audio processing module according to claim 2, characterized in that, The mute unit includes a pop noise suppressor U9, resistors R77, R78, R79, and R80, and capacitors C84, C85, C87, and C88. The INL terminal of the POP sound suppressor U9 is connected to the first differential output terminal of the single-ended to differential conversion circuit, and the INR terminal of the POP sound suppressor U9 is connected to the second differential output terminal of the single-ended to differential conversion circuit. The UVP terminal of the POP sound suppressor U9 is connected to the first terminal of the resistor R77, the first terminal of the resistor R78, and the first terminal of the capacitor C84. The second terminal of the resistor R77 is connected to the power supply unit, and the second terminals of the resistor R78 and the second terminals of the capacitor C84 are grounded. The MUTE terminal of the POP sound suppressor U9 is connected to the first terminal of the capacitor C85, the first terminal of the resistor R79, and the first terminal of the resistor R80. The second terminal of the resistor R79 is connected to the control level output terminal of the feedback suppression unit. The second terminals of the capacitor C85 and the second terminals of the resistor R80 are grounded. The CPB terminal of the POP sound suppressor U9 is grounded via the capacitor C88, and the SET terminal of the POP sound suppressor U9 is grounded via the capacitor C87.

4. The anti-howling audio processing module according to claim 2, characterized in that, The single-ended to differential conversion circuit includes an operational amplifier chip U3, resistors R67, R68, R69, R70, R71, R72, R73, capacitors C82 and C83. The first pin of the operational amplifier chip U3 is connected to the first end of the resistor R75, the first end of the resistor R73 and the first end of the capacitor C83, and the second pin of the operational amplifier chip U3 is connected to the second end of the resistor R73, the second end of the capacitor C83 and the first end of the resistor R72. The seventh pin of the operational amplifier chip U3 is connected to the first end of the resistor R70, the first end of the resistor R67, the first end of the capacitor C82, and the second end of the resistor R72. The sixth pin of the operational amplifier chip U3 is connected to the second end of the resistor R67, the second end of the capacitor C82, and the first end of the resistor R68. The second end of the resistor R68 is connected to the output terminal of the gain adjustment unit. The second end of resistor R70 is connected to the first end of resistor R71 and the first end of resistor R69. The second end of resistor R69 is the first differential output terminal of the single-ended to differential conversion circuit. The second end of resistor R75 is connected to the first end of resistor R76 and the first end of resistor R74, and the second end of resistor R74 is the second differential output terminal of the single-ended to differential conversion circuit. The third and fifth pins of the operational amplifier chip U3, the second terminal of the resistor R71, and the second terminal of the resistor R76 are grounded.

5. The anti-howling audio processing module according to claim 2, characterized in that, The output interface circuit includes resistor R81, resistor R82, capacitor C89, capacitor C93, capacitor C90, inductor L3, inductor L4, capacitor C91, capacitor C92, capacitor C94, capacitor C95, connector J5, connector J6, and connector J7. The first end of resistor R81, the first end of capacitor C89, and the first end of inductor L3 are connected to the first differential output terminal of the single-ended to differential converter circuit; the first end of resistor R82, the first end of capacitor C93, and the first end of inductor L4 are connected to the second differential output terminal of the single-ended to differential converter circuit. The second end of the inductor L3 is connected to the first end of the capacitor C91, the second pin of the connector J5, the first end of the capacitor C94, the first end of the connector J6, and the third pin of the connector J7. The second end of the inductor L4 is connected to the first end of the capacitor C92, the third pin of the connector J5, the first end of the capacitor C95, the second end of the connector J6, and the second pin of the connector J7. The second terminal of capacitor C89 is connected to the second terminal of capacitor C93 and the first terminal of capacitor C90. The second terminals of resistor R81, resistor R82, capacitor C90, capacitor C91, capacitor C92, capacitor C94, capacitor C95, the first and fourth pins of connector J5, the third terminal of connector J6, and the first pin of connector J7 are grounded respectively.

6. The anti-howling audio processing module according to claim 1, characterized in that, The analog audio input unit includes a differential-to-single-ended converter circuit and an input interface circuit; The input terminal of the input interface circuit is used for the external analog audio input; The input terminal of the differential-to-single-ended converter circuit is connected to the output terminal of the input interface circuit, and the output terminal of the differential-to-single-ended converter circuit is connected to the input terminal of the analog-to-digital converter unit.

7. The anti-howling audio processing module according to claim 6, characterized in that, The differential-to-single-ended conversion circuit includes an operational amplifier chip U1, resistors R19, R20, R21, and R22, and capacitors C39, C40, and C42. The first pin of the operational amplifier chip U1 is connected to the second pin of the operational amplifier chip U1 and the first end of the resistor R20, and the third pin of the operational amplifier chip U1 is connected to the first signal output terminal of the input interface circuit. The sixth pin of the operational amplifier chip U1 is connected to the second end of the resistor R20, the first end of the resistor R19, and the first end of the capacitor C39; the fifth pin of the operational amplifier chip U1 is connected to the first end of the resistor R21, the first end of the resistor R22, and the first end of the resistor C42; and the seventh pin of the operational amplifier chip U1 is connected to the first end of the capacitor C40, the second end of the resistor R19, and the second end of the capacitor C39. The second end of the resistor R21 is connected to the second signal output terminal of the input interface circuit, and the second end of the capacitor C40 is the output terminal of the differential to single-ended conversion circuit.

8. The anti-howling audio processing module according to claim 7, characterized in that, The input interface circuit includes: capacitors C29, C30, C31, C32, C33, and C34; resistors R12, R13, R14, R15, R16, R17, and R18; and connectors J2, J3, and J4. The first end of capacitor C30 is connected to the second pin of connector J3, the third pin of connector J4 and the first end of capacitor C29; the second end of capacitor C30 is connected to the third pin of connector J3, the second pin of connector J4 and the first end of capacitor C31. The second end of capacitor C29 is connected to the first end of connector J3, the first end of resistor R12, the first end of capacitor C33 and the first end of resistor R17; the second end of capacitor C31 is connected to the second end of connector J3, the first end of resistor R16, the first end of capacitor C32 and the first end of resistor R18. The second end of resistor R12 is connected to the first end of resistor R14 and the first end of resistor R13 and serves as the first signal output terminal of the input interface circuit. The second end of resistor R16 is connected to the second end of resistor R14 and the first end of resistor R15 and serves as the second signal output terminal of the input interface circuit. The second ends of resistor R13 and resistor R15 are connected to the ground of the processing module. The first pin of connector J2, the third end of connector J3, the first pin of connector J4, the second end of capacitor C33, the second end of capacitor C32, the second end of resistor R17, and the second end of resistor R18 are connected to the ground of the external device. The ground of the external device is connected to the ground of the processing module through capacitor C34.

9. The anti-howling audio processing module according to claim 1, characterized in that, The gain adjustment unit includes a first operational amplifier circuit, a DIP switch circuit, a second operational amplifier circuit, and a rotary switch circuit; The first input terminal of the first operational amplifier circuit is connected to the first signal output terminal of the feedback suppression unit, the second input terminal of the first operational amplifier circuit is connected to the second signal output terminal of the feedback suppression unit, the output terminal of the first operational amplifier circuit is connected to the input terminal of the DIP switch circuit, the output terminal of the DIP switch circuit is connected to the first input terminal of the second operational amplifier circuit, the second input terminal of the second operational amplifier circuit is grounded, the output terminal of the second operational amplifier circuit is connected to the third terminal of the rotary switch circuit, the second terminal of the rotary switch circuit is the output terminal of the gain adjustment unit, and the first terminal of the rotary switch circuit is grounded.

10. The anti-feedback audio processing module according to claim 9, characterized in that, The first operational amplifier circuit includes a chip U2A, capacitors C60 and C61, resistors R52 and R54, capacitors C62 and C64, resistors R55 and C59, and resistor R51. The second pin of chip U2A is connected to the first terminals of resistors R52, C62, R51, and C59. The third pin of chip U2A is connected to the first terminal of resistor R54, the second terminal of capacitor C62, R55, and C64. The first terminal of the first operational amplifier circuit is connected to the second terminal of the first capacitor C60, and the second terminal of the first operational amplifier circuit is connected to the second terminal of the first capacitor C61. The second terminal of the first operational amplifier circuit is connected to the second terminal of the first capacitor C61, and the second terminal of the first operational amplifier circuit is connected to the second terminal of the first operational amplifier circuit. The second terminal of the first capacitor C64 and the second terminal of the second resistor R55 are grounded. The first pin of the chip U2A is connected to the second terminal of the second resistor R51 and the second terminal of the second capacitor C59, and serves as the output terminal of the first operational amplifier circuit. and / or The DIP switch circuit includes a DIP switch SW1, resistors R60, R61, R62, R63, R64, R65, capacitors C71, C72, and C73. The third pin of the DIP switch SW1 is the input terminal of the circuit. The first pin of the DIP switch SW1 is connected to the first terminal of resistor R65 and the first terminal of capacitor C73. The second pin of the DIP switch SW1 is connected to the first terminal of resistor R63 and the first terminal of capacitor C72. The fourth pin of the DIP switch SW1 is connected to the first terminal of resistor R64 and the first terminal of capacitor C71. The second terminal of capacitor C71 is connected to the first terminal of resistor R60, the second terminal of capacitor C72 is connected to the first terminal of resistor R61, and the second terminal of capacitor C73 is connected to the first terminal of resistor R62. The second terminals of resistors R60 and R61 are the output terminals of the DIP switch circuit; and / or The second operational amplifier circuit includes a chip U2B, a resistor R59, a capacitor C70, a resistor R66, a capacitor C76, a capacitor C77, and a capacitor C74. The sixth pin of the chip U2B is connected to the output terminal of the DIP switch circuit, the first terminal of the capacitor C76, the first terminal of the capacitor C70, and the first terminal of the resistor R59. The fifth pin of the chip U2B is connected to the second terminal of the capacitor C76, the first terminal of the capacitor C77, and the first terminal of the resistor R66. The seventh pin of the chip U2B is connected to the second terminal of the capacitor C70, the second terminal of the resistor R59, and the first terminal of the capacitor C74. The second terminal of the capacitor C74 is the output terminal of the second operational amplifier circuit. The second terminals of the capacitor C77 and the second terminals of the resistor R66 are grounded.

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