Signal mute circuit and audio device
By introducing a voltage divider unit into the signal MUTE circuit, the problem of poor noise floor suppression in analog small signal output is solved, improving the signal-to-noise ratio and user experience, while reducing costs.
Patent Information
- Application Number
- CN202423043436.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In existing technologies, analog small signal outputs cannot be completely muted by the internal resistance of the device, resulting in poor noise suppression performance, which affects the signal-to-noise ratio of the product and the user experience. In addition, the cost of using SOC and other chips is relatively high.
The signal MUTE circuit is adopted. By setting the first and second voltage divider units between the signal input and output, the voltage divider circuit reduces the signal gain and reduces noise interference. It includes a signal input terminal, a signal output terminal, a first voltage divider unit and a second voltage divider unit. The voltage divider unit performs voltage division processing when the voltage at the controlled terminal reaches a set value.
It effectively reduces circuit noise interference at the signal output end, improves the signal-to-noise ratio and user experience, and reduces costs.
Smart Images
Figure CN223540680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of audio signal processing technology, and in particular to a signal MUTE circuit and an audio device. Background Technology
[0002] Currently, in circuit design, the analog small signal output cannot be completely contained due to the internal resistance of the device, resulting in poor performance in suppressing background noise, which affects the signal-to-noise ratio of the product and the user experience.
[0003] Existing technologies use chips such as SOCs to improve the signal-to-noise ratio and reduce product noise floor; however, these chips are expensive, resulting in higher costs. Utility Model Content
[0004] The main purpose of this invention is to provide a signal MUTE circuit, which aims to reduce the noise floor of a product.
[0005] To achieve the above objectives, the present invention proposes a signal MUTE circuit, which includes:
[0006] Signal input terminal, signal output terminal, first voltage divider unit and second voltage divider unit;
[0007] The input terminal of the first voltage divider unit is connected to the signal input terminal, and the output terminal is connected to the input terminal of the second voltage divider unit; the first voltage divider unit is used to divide the first voltage at the signal input terminal and output a second voltage to the second voltage divider unit when the voltage at the controlled terminal of the first voltage divider unit is greater than the first set voltage;
[0008] The output terminal of the second voltage divider unit is connected to the signal output terminal; the second voltage divider unit is used to divide the second voltage and output a third voltage to the signal output terminal when the voltage at the controlled terminal of the second voltage divider unit is greater than the second set voltage.
[0009] This utility model also proposes an audio device, which includes the signal MUTE circuit. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the signal MUTE circuit of this utility model;
[0012] Figure 2 for Figure 1 A schematic diagram of the impedance equivalent circuit;
[0013] Figure 3 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model;
[0014] Figure 4 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model;
[0015] Figure 5 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model;
[0016] Figure 6 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model;
[0017] Figure 7 This is a schematic diagram of the structure of an embodiment of the signal MUTE circuit of this utility model;
[0018] Figure 8 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model;
[0019] Figure 9 This is a schematic diagram of another embodiment of the signal MUTE circuit of this utility model.
[0020] Explanation of icon numbers:
[0021]
[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0026] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0027] Currently, audio products such as BT Speaker, WiFi speaker, S-BAR, PART_BOX, and MIC can produce varying degrees of noise in their analog signal output due to circuit noise during operation.
[0028] like Figure 1 As shown, Figure 1 As an example of an audio signal MUTE circuit, when the switching device in the diagram is controlled to be turned on, it grounds the signal input terminal 10, pulling down the voltage value at the signal output terminal 20. Ideally, the voltage value at the signal output terminal 20 is zero; that is, the switching device can be controlled to be turned on to prevent the electrical signal from the signal input terminal 10 from appearing at the signal output terminal 20. In practical applications, if it is necessary for the signal input terminal 10 to transmit a signal to the signal output terminal 20, the switching device is controlled to be turned off; if it is not necessary for the audio output terminal to receive the signal output from the signal input terminal 10, the switching device is controlled to be turned on.
[0029] However, it should be noted that when the output analog audio signal is small, due to the internal resistance of the switching device, the small audio signal cannot be completely shorted to ground when the switching device is turned on, and a portion of the signal level will be output to the signal output terminal 20. In other words, because the internal resistance of the device cannot completely contain the analog signal output, its performance in suppressing background noise is poor, affecting the product's signal-to-noise ratio and user experience.
[0030] To solve the above problems, this utility model discloses a signal MUTE circuit, which includes:
[0031] Signal input terminal 10, signal output terminal 20, first voltage divider unit 30, and second voltage divider unit 40;
[0032] The input terminal of the first voltage divider unit 30 is connected to the signal input terminal 10, and the output terminal is connected to the input terminal of the second voltage divider unit 40. The first voltage divider unit 30 is used to divide the first voltage of the signal input terminal 10 and output a second voltage to the second voltage divider unit 40 when the voltage at the controlled terminal of the first voltage divider unit is greater than the first set voltage.
[0033] The output terminal of the second voltage divider unit 40 is connected to the signal output terminal 20; the second voltage divider unit 40 is used to divide the second voltage and output a third voltage to the signal output terminal 20 when the voltage at the controlled terminal of the second voltage divider unit is greater than the second set voltage.
[0034] It should be noted that, due to the existence of the internal resistance of the switching device, Figure 1 The switching devices and resistors in the middle form a voltage divider circuit. Figure 1 In this context, the voltage at signal output terminal 20 is the voltage value across the two ends of the controller. Figure 2 for Figure 1 The equivalent circuit diagram.
[0035] This invention provides a first voltage divider unit 30 and a second voltage divider unit 40 between the signal input terminal 10 and the signal output terminal 20. The output voltage of the first voltage divider unit 30 is the input voltage of the second voltage divider unit 40. The first voltage divider unit 30 and the second voltage divider unit 40 constitute a two-stage voltage divider circuit. Compared to the first voltage divider circuit, the voltage gain of the two-stage voltage divider circuit is the product of the voltage gain of the first voltage divider unit 30 and the voltage gain of the second voltage divider unit 40. It is easy to understand that the first voltage divider unit 30 and the second voltage divider unit 40 have controlled terminals. When the voltage at the controlled terminal of the first voltage divider unit 30 is greater than a first set voltage value, it divides the first voltage at the signal input terminal 10 and outputs a second voltage to the second voltage divider unit 40. When the voltage at the controlled terminal of the first voltage divider unit 30 is less than or equal to the first set voltage value, the first voltage at the signal input terminal 10 reaches the input terminal of the second voltage divider unit 40, which then processes it.
[0036] It should be noted that the first and second set voltages are determined by the R&D personnel. For example... Figure 1As shown, the switching device and the resistor form a voltage divider circuit. When the switching device is turned on, the voltage divider circuit divides the first voltage at the signal input terminal. A resistor may also be present across the switching device. The first and second voltage divider units can be equivalent to the circuit structure formed by the resistor and the switching device described above. The controlled terminal of the first voltage divider unit is the control terminal of the switching device within the first voltage divider unit. When the voltage at the controlled terminal of the first voltage divider unit is greater than a first set voltage, the switching device is turned on. Correspondingly, the controlled terminal of the second voltage divider unit is the control terminal of the switching device within the second voltage divider unit. When the voltage at the controlled terminal of the second voltage divider unit is greater than a second set voltage, the switching device is turned on.
[0037] In one embodiment of this utility model, the controlled terminals of the first voltage divider unit 30 and the second voltage divider unit 40 are interconnected.
[0038] In one example, the values of the first set voltage and the second set voltage are different. This solution does not limit the comparison relationship between the first set voltage and the second set voltage; for ease of explanation, an example is given where the first set voltage is greater than the second set voltage. If the voltage at the controlled terminal is less than or equal to the second set voltage value, neither the first voltage divider unit 30 nor the second voltage divider unit 40 operates. If the voltage at the controlled terminal is greater than the second set voltage value but less than or equal to the first set voltage value, the second voltage divider unit 40 divides the voltage at its input terminal, and the first voltage divider unit 30 does not operate. In this example, the operating combination of the first voltage divider unit 30 and the second voltage divider unit 40 can be changed by adjusting the voltage value at the controlled terminal, thereby adjusting the voltage gain of the signal MUTE circuit.
[0039] In another example, the values of the first set voltage and the second set voltage are the same. The first switching unit and the second switching unit are simultaneously turned off and on.
[0040] In another embodiment of the present invention, the controlled terminals of the first voltage divider unit 30 and the second voltage divider unit 40 are not connected, and the voltage gain of the signal MUTE circuit can be adjusted by independently controlling whether the first voltage divider unit 30 and the second voltage divider unit 40 work.
[0041] It should be noted that the first voltage divider unit 30 and the second voltage divider unit 40 may include switching devices, which are used to control whether the first voltage divider unit 30 or the second switching unit is working. Specifically, the switching device determines whether the path between the input terminal of the first voltage divider unit 30 and the input terminal of the second switching unit and ground is connected. This generates a voltage across the circuit components through which current flows, serving as the output voltage of the voltage divider unit.
[0042] It is easy to understand that the voltage gain of the voltage divider unit is in the range of 0 to 1; the smaller the voltage gain of the signal MUTE circuit, the less interference is received by the signal output terminal 20 when the first voltage divider unit 30 and / or the second voltage divider unit 40 are working and the signal input terminal 10 outputs an analog small signal.
[0043] It should be noted that this solution does not limit the type or connection method of the first voltage divider unit 30 and the second voltage divider unit 40. For example... Figure 3 As shown, the first voltage divider unit 30 and the second voltage divider unit 40 can be connected in parallel and grounded. Compared with the first voltage divider unit 30 operating alone, the impedance value of the first voltage divider unit 30 and the second voltage divider unit 40 connected in parallel is smaller, and the voltage output at both ends is smaller than the output voltage value of the first voltage divider unit 30 alone; that is, the second voltage divider unit 40 divides the second voltage output by the original first voltage divider unit 30.
[0044] like Figure 4 As shown, the first voltage divider unit 30 and the second voltage divider unit 40 are connected in series.
[0045] This invention proposes a signal MUTE circuit, which includes: a signal input terminal 10, a signal output terminal 20, a first voltage divider unit 30, and a second voltage divider unit 40; the input terminal of the first voltage divider unit 30 is connected to the signal input terminal 10, and the output terminal is connected to the input terminal of the second voltage divider unit 40; the first voltage divider unit 30 is used to divide the first voltage of the signal input terminal 10 and output a second voltage to the second voltage divider unit 40 when the voltage at its controlled terminal is greater than a first set voltage; the output terminal of the second voltage divider unit 40 is connected to the signal output terminal 20; the second voltage divider unit 40 is used to divide the second voltage and output a third voltage to the signal output terminal 20 when the voltage at its controlled terminal is greater than a second set voltage. This invention provides a lower voltage gain for the signal MUTE circuit through the combination of the first voltage divider unit 30 and the second voltage divider unit 40, ensuring that the voltage input to the signal input terminal 10 has a lower voltage value when it reaches the signal output terminal 20 after passing through the first voltage divider unit 30 and the second voltage divider unit 40, thereby reducing circuit noise interference to the signal output terminal 20.
[0046] It is readily understood that the voltage gain of the signal MUTE circuit is related to the number of voltage divider units and the voltage gain of each voltage divider unit. To further reduce the voltage gain of the signal MUTE circuit and decrease the circuit noise received at the signal output terminal 20, in one embodiment, the signal MUTE circuit further includes at least a third voltage divider unit.
[0047] Each voltage divider unit is connected in series between the signal input terminal 10 and the signal output terminal 20, with its input terminal connected to the output terminal of the adjacent voltage divider unit.
[0048] Each voltage divider unit is used to divide the voltage at its input terminal and output the divided voltage when the voltage at the controlled terminal of the corresponding voltage divider unit is greater than the corresponding turn-on set voltage value.
[0049] It should be noted that in this embodiment, there are multiple voltage divider units, including at least a first voltage divider unit 30, a second voltage divider unit 40, and a third voltage divider unit.
[0050] like Figure 3 and Figure 4 As shown, referring to the connection method of the first voltage divider unit 30 and the second voltage divider unit 40 described above, each voltage divider unit is connected in series between the signal input terminal 10 and the signal output terminal 20, with its input terminal connected to the output terminal of the adjacent voltage divider unit; wherein, two adjacent voltage divider units can be connected in parallel or in series.
[0051] It is easy to understand that the turn-on voltage values of each voltage divider unit can be different. This allows for the targeted selection of the appropriate voltage divider unit to provide a specific voltage gain to the signal MUTE circuit.
[0052] In one embodiment, such as Figure 5 As shown, the first voltage divider unit 30 includes: a first resistor R1 and a first switching assembly;
[0053] The first end of the first resistor R1 is connected to the signal input terminal 10, and the second end is connected to the first terminal of the first switching assembly and the input terminal of the second voltage divider unit 40; the second terminal of the first switching assembly is grounded.
[0054] The first switching assembly is used to connect the path between the second terminal of the first resistor and ground when the voltage at the controlled terminal of the first switching assembly is greater than a first set voltage.
[0055] Wherein, the end of the first resistor R1 connected to the first switching component is the output terminal of the first voltage divider unit 30. The first resistor R1 and the internal resistance of the first switching component form a resistor voltage divider circuit; since one end of the first switching component is grounded, the voltage across the first switching component is the voltage value of the output terminal of the first voltage divider unit 30. The first switching component may include switching transistors such as MOSFETs, transistors D1, and IGBTs. There may be multiple switching transistors in the first switching component, and the controlled terminals of the multiple switching transistors are interconnected. The switching transistors conduct when the voltage at the controlled terminal is greater than a first set voltage; the first set voltage can be its conduction voltage.
[0056] like Figure 6 As shown, the second voltage divider unit 40 includes:
[0057] Second switching assembly;
[0058] The first end of the second switching assembly is connected to the output end of the first voltage divider unit 30 and the signal output end 20, and the second end is grounded; the second switching assembly is used to open the path between the output end of the first voltage divider unit and ground when the voltage at the controlled end of the second switching assembly is greater than the second set voltage.
[0059] The second switch assembly and the first switch assembly are connected in parallel, and together with the first resistor R1, they form a resistor voltage divider circuit. Since the impedance of the second switch assembly and the first switch assembly connected in parallel is less than the impedance of the first switch assembly, the voltage value at the first terminal of the second switch assembly becomes smaller.
[0060] The second switching assembly may include switching transistors such as MOSFETs, transistors D1, and IGBTs. The first switching assembly may contain multiple switching transistors, and the controlled terminals of the multiple switching transistors are interconnected. The switching transistors are turned on when the voltage at the controlled terminal is greater than a second set voltage, which can be their turn-on voltage.
[0061] like Figure 7 As shown, in order to reduce the voltage gain of the second voltage divider unit 40, the second voltage divider unit 40 further includes: a second resistor R2;
[0062] The first end of the second resistor R2 is connected to the output end of the first voltage divider unit 30, and the second end is connected to the first end of the second switch assembly and the signal output end 20.
[0063] The second resistor R2 and the second switch assembly form a voltage divider circuit, which divides the second voltage output by the first voltage divider circuit and outputs a third voltage to the signal output terminal 20.
[0064] It should be noted that the first resistor R1 and the second resistor R2 mentioned above can be replaced with combinations of other components, such as capacitors, inductors, and / or resistors. The above example uses preferred first resistor R1 and second resistor R2. The resistance values of the resistors and capacitance values in the accompanying drawings are selected values for a feasible example of this invention and should not be used as a basis for limiting the values of the components in this invention.
[0065] It is readily understood that, to avoid the failure to successfully drive and control the first voltage divider unit 30 and the second voltage divider unit 40 due to an excessively small amplitude of the external control signal, in one embodiment of this invention, the signal MUTE circuit further includes: a driving circuit;
[0066] The input terminal of the driving circuit is connected to an external control signal, and the output terminal is connected to the controlled terminal of the voltage divider unit; the driving circuit is used to amplify the voltage of the external control signal and output it.
[0067] Reference Figure 8 The driving circuit includes:
[0068] The third resistor R3, the fourth resistor R4, the transistor D1, the fifth resistor R5, and the sixth resistor R6;
[0069] The first end of the third resistor R3 is connected to an external control signal, and the second end is connected to the first end of the fourth resistor R4 and the base of the transistor D1; the second end of the fourth resistor R4 is grounded; the first end of the fifth resistor R5 is connected to an external power supply, and the second end is connected to the controlled terminal of the voltage divider unit and the collector of the transistor D1; the emitter of the transistor D1 is grounded; the two ends of the sixth resistor R6 are respectively connected to the second end of the fifth resistor R5 and ground.
[0070] The driving circuit is a transistor D1 amplifier circuit. When the transistor D1 is off, the external power supply provides a voltage value sufficient to turn on the controlled terminal of the voltage divider unit. When the transistor D1 is turned on under the action of an external control signal, it pulls down the voltage at the controlled terminal of the voltage divider unit, and the voltage divider unit stops working.
[0071] The third resistor R3 and the fourth resistor R4 form a voltage divider circuit, which divides the external control signal and outputs it to the transistor D1. The fifth resistor R5 and the sixth resistor R6 form a voltage divider circuit, which divides the output voltage of the external power supply and outputs it to the voltage divider unit.
[0072] The driving circuit also includes: a first capacitor C1;
[0073] The first terminal of the first capacitor C1 is connected to the controlled terminal of the voltage divider unit, and the second terminal is connected to the second terminal of the sixth resistor R6 and grounded.
[0074] It is easy to understand that the first capacitor C1 and the sixth resistor R6 are connected in parallel, which helps the switching device to turn off quickly when the switching components in the first voltage divider unit 30 or the second voltage divider unit 40 are turned off. In addition, the first capacitor C1 can also stabilize the voltage when the output voltage of the external power supply fluctuates.
[0075] The signal MUTE circuit also includes: a second capacitor C2;
[0076] The first end of the second capacitor C2 is connected to the signal input terminal 10, and the second end is connected to the input terminal of the first voltage divider unit 30.
[0077] It is easy to understand that the second capacitor C2 is a coupling capacitor. During the transmission of the audio signal, the capacitor acts as a "bridge," connecting the signal input terminal 10 and the signal output terminal 20, while simultaneously blocking the flow of direct current. This ensures the continuous transmission of the audio signal and avoids the adverse effects of direct current on the circuit.
[0078] This utility model also proposes an audio device, which includes the signal MUTE circuit. The specific structure of the signal MUTE circuit is as described in the above embodiments. Since this signal MUTE circuit adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0079] The audio device can be a BT Speaker, a Wi-Fi speaker, an S-BAR, a PART_BOX, a MIC, or other audio products.
[0080] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.
Claims
1. A signal MUTE circuit, characterized in that, The signal MUTE circuit includes: Signal input terminal, signal output terminal, first voltage divider unit and second voltage divider unit; The input terminal of the first voltage divider unit is connected to the signal input terminal, and the output terminal is connected to the input terminal of the second voltage divider unit; the first voltage divider unit is used to divide the first voltage at the signal input terminal and output a second voltage to the second voltage divider unit when the voltage at the controlled terminal of the first voltage divider unit is greater than the first set voltage; The output terminal of the second voltage divider unit is connected to the signal output terminal; the second voltage divider unit is used to divide the second voltage and output a third voltage to the signal output terminal when the voltage at the controlled terminal of the second voltage divider unit is greater than the second set voltage.
2. The signal MUTE circuit as described in claim 1, characterized in that, The signal MUTE circuit also includes at least a third voltage divider unit; Each voltage divider unit is connected in series between the signal input terminal and the signal output terminal, with its input terminal connected to the output terminal of the adjacent voltage divider unit. Each voltage divider unit is used to divide the voltage at its input terminal and output the divided voltage when the voltage at the controlled terminal of the corresponding voltage divider unit is greater than the corresponding turn-on set voltage value.
3. The signal MUTE circuit as described in claim 1, characterized in that, The first voltage divider unit includes: a first resistor and a first switching assembly; The first end of the first resistor is connected to the signal input terminal, and the second end is connected to the first terminal of the first switching assembly and the input terminal of the second voltage divider unit; the second end of the first switching assembly is grounded. The first switching assembly is used to connect the path between the second terminal of the first resistor and ground when the voltage at the controlled terminal of the first switching assembly is greater than a first set voltage.
4. The signal MUTE circuit as described in claim 1, characterized in that, The second voltage divider unit includes: a second switching assembly; The first end of the second switching assembly is connected to the output end of the first voltage divider unit and the signal output end, and the second end is grounded; the second switching assembly is used to open the path between the output end of the first voltage divider unit and ground when the voltage at the controlled end of the second switching assembly is greater than the second set voltage.
5. The signal MUTE circuit as described in claim 4, characterized in that, The second voltage divider unit further includes: a second resistor; The first end of the second resistor is connected to the output end of the first voltage divider unit, and the second end is connected to the first end of the second switching assembly and the signal output end.
6. The signal MUTE circuit as described in any one of claims 1 to 5, characterized in that, The signal MUTE circuit further includes: a driving circuit; The input terminal of the driving circuit is connected to an external control signal, and the output terminal is connected to the controlled terminal of the voltage divider unit; the driving circuit is used to amplify the voltage of the external control signal and output it.
7. The signal MUTE circuit as described in claim 6, characterized in that, The driving circuit includes: The third resistor, the fourth resistor, the transistor, the fifth resistor, and the sixth resistor; The first end of the third resistor is connected to an external control signal, and the second end is connected to the first end of the fourth resistor and the base of the transistor; the second end of the fourth resistor is grounded; the first end of the fifth resistor is connected to an external power supply, and the second end is connected to the controlled terminal of the voltage divider unit and the collector of the transistor; the emitter of the transistor is grounded; the two ends of the sixth resistor are respectively connected to the second end of the fifth resistor and ground.
8. The signal MUTE circuit as described in claim 7, characterized in that, The driving circuit further includes: a first capacitor; The first terminal of the first capacitor is connected to the controlled terminal of the voltage divider unit, and the second terminal is connected to the second terminal of the sixth resistor and grounded.
9. The signal MUTE circuit as described in claim 6, characterized in that, The signal MUTE circuit also includes: a second capacitor; The first end of the second capacitor is connected to the signal input terminal, and the second end is connected to the input terminal of the first voltage divider unit.
10. An audio device, characterized in that, The audio device includes the signal MUTE circuit as described in any one of claims 1 to 9.