Microphone automatic trigger switch module and tuning system

Abstract

The utility model provides a microphone automatic trigger switch module and sound system belongs to circuit field. Microphone automatic trigger switch module is applicable to the audio mixing equipment of phantom power supply for microphone, wherein: the pickup is connected to the input end of detection module, the output end of detection module is connected to the input end of processing module, the output end of processing module is connected to the control end of mute control module, the first input end, second input end of mute control module are used for respectively connecting to the hot end and cold end of balanced signal line between audio mixing equipment and microphone, detection module is used for according to the pickup signal output detection signal of pickup, processing module is used for according to detection signal output control signal, mute control module is used for according to control signal control short -circuit operation between its first input end and second input end, mute control can be carried out to microphone in this way, can effectively reduce the howling phenomenon on stage when the orchestra plays, improves stage sound reinforcement quality.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a microphone automatic trigger switch module and tuning system. Background Technology

[0002] Bands use numerous microphones for their instruments during stage performances, and crosstalk can easily occur between adjacent microphones. The phase interference caused by crosstalk can significantly affect sound quality. Currently, the common solution is to increase the distance between adjacent microphones, but this method places greater demands on the stage space during performances.

[0003] Therefore, there is a need for a technical solution that can effectively solve the problem of crosstalk between adjacent microphones during stage performances without changing the distance between them. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a microphone automatic trigger switch module and a tuning system.

[0005] This utility model provides an automatic microphone trigger switch module, which is suitable for audio mixing devices that provide phantom power to microphones, including a microphone, a detection module, a processing module, and a mute control module;

[0006] The microphone is electrically connected to the input terminal of the detection module;

[0007] The output of the detection module is electrically connected to the input of the processing module;

[0008] The output terminal of the processing module is electrically connected to the control terminal of the mute control module;

[0009] The first and second input terminals of the mute control module are respectively electrically connected to the hot and cold ends of the balanced signal line between the audio mixing device and the microphone;

[0010] The detection module is used to output a detection signal based on the pickup signal of the microphone; the processing module is used to output a control signal based on the detection signal; and the mute control module is used to control the short-circuit operation between its first input terminal and its second input terminal based on the control signal, thereby controlling the microphone to mute.

[0011] In one possible implementation, the mute control module includes a first switching unit and a second switching unit;

[0012] The control terminal of the first switch unit serves as the control terminal of the silent control module. One end of its switch is electrically connected to the control terminal of the second switch unit, and the other end of its switch is electrically grounded.

[0013] The first and second ends of the second switch unit serve as the first and second input ends of the mute control module, respectively.

[0014] In one possible implementation, the first switching unit includes a first NPN transistor, a first resistor, and a second resistor;

[0015] The collector of the first NPN transistor is electrically connected to the first end of the first resistor, its emitter serves as the second terminal of the first switching unit, and its base is electrically connected to the first end of the second resistor.

[0016] The second end of the first resistor serves as one end of the switch of the first switching unit;

[0017] The second end of the second resistor serves as the control terminal of the first switching unit.

[0018] In one possible implementation, a first capacitor is electrically connected between the second end of the first resistor and the emitter of the first NPN transistor.

[0019] In one possible implementation, the second switching unit includes a PMOS transistor, a third resistor, and a fourth resistor;

[0020] The gate of the PMOS transistor is electrically connected to the first end of the third resistor and the first end of the fourth resistor, respectively, as the control terminal of the second switching unit. Its source is electrically connected to the second end of the third resistor as the first switching terminal of the second switching unit, and its drain is electrically connected to the second end of the fourth resistor as the second switching terminal of the second switching unit.

[0021] In one possible implementation, the detection module includes a microphone interface, a second NPN transistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, and a fourth capacitor.

[0022] The first end of the microphone interface is electrically connected to the first end of the second capacitor, the first end of the third capacitor, and the first end of the fifth resistor, respectively, and its second end is electrically connected to the second end of the second capacitor, the emitter of the second NPN transistor, and grounded.

[0023] The base of the second NPN transistor is electrically connected to the second terminal of the third capacitor and the first terminal of the sixth resistor, respectively, and its collector is electrically connected to the second terminal of the sixth resistor, the first terminal of the seventh resistor, and the first terminal of the fourth capacitor, respectively.

[0024] The second end of the fifth resistor is electrically connected to the second end of the seventh resistor and connected to the working power supply;

[0025] The second terminal of the fourth capacitor serves as the output terminal of the detection module.

[0026] In one possible implementation, an eighth resistor, a ninth resistor, and a Zener diode are also included;

[0027] The first end of the eighth resistor and the first end of the ninth resistor are electrically connected to the first input terminal and the second input terminal of the mute control module, respectively, and their respective second ends are electrically connected as working power supply terminals to provide the working power.

[0028] The Zener diode is electrically connected between the power supply terminal and ground to stabilize the voltage.

[0029] In one possible implementation, the power supply terminal of the processing module is electrically connected to the operating power supply terminal, and is also electrically connected to a grounded fifth capacitor.

[0030] In one possible implementation, an adjustment module electrically connected to the processing module is also included for adjusting the mute delay time and sensitivity.

[0031] This utility model also provides a sound mixing system, including an audio mixing device equipped with a phantom power module, a microphone automatic trigger switch module as described above, and a microphone suitable for phantom power;

[0032] The audio mixing device is electrically connected to the microphone automatic trigger switch module and the microphone, respectively.

[0033] The technical solution provided by this utility model has at least the following beneficial effects:

[0034] By setting up a microphone, detection module, processing module, and mute control module, the playing status of the instruments can be detected in real time, and the corresponding microphones can be muted based on the playing status of the instruments. This effectively reduces crosstalk on stage during band performances and improves the stage sound reinforcement quality. Attached Figure Description

[0035] Figure 1 A structural block diagram of the first type of microphone automatic trigger switch module provided in this embodiment of the utility model;

[0036] Figure 2A structural block diagram of the silent control module provided in this embodiment of the utility model;

[0037] Figure 3 A circuit diagram of the mute control module provided in this embodiment of the utility model;

[0038] Figure 4 The circuit diagram of the detection module provided in this embodiment of the utility model;

[0039] Figure 5 The circuit diagram of the Zener diode provided in this embodiment of the utility model;

[0040] Figure 6 Circuit schematic diagram of the processing module provided in the embodiment of this utility model;

[0041] Figure 7 A structural block diagram of a second microphone automatic trigger switch module provided in this embodiment of the present invention;

[0042] Figure 8 Circuit diagram of the adjustment module provided in this embodiment of the utility model;

[0043] Figure 9 The circuit diagram for connecting the microphone is provided in the embodiment of this utility model. Detailed Implementation

[0044] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0045] Please refer to Figures 1 to 9 The present invention provides an automatic microphone trigger switch module, which is suitable for audio mixing devices that provide phantom power to microphones, including a microphone, a detection module, a processing module, and a mute control module;

[0046] The microphone is electrically connected to the input terminal of the detection module;

[0047] The output of the detection module is electrically connected to the input of the processing module;

[0048] The output terminal of the processing module is electrically connected to the control terminal of the mute control module;

[0049] The first and second input terminals of the mute control module are respectively electrically connected to the hot and cold ends of the balanced signal line between the audio mixing device and the microphone;

[0050] The detection module is used to output a detection signal based on the pickup signal of the microphone; the processing module is used to output a control signal based on the detection signal; and the mute control module is used to control the short-circuit operation between its first input terminal and its second input terminal based on the control signal, thereby controlling the microphone to mute.

[0051] In this embodiment, the pickup can be a passive piezoelectric ceramic pickup. The detection module can be built based on a conventional transistor combined with resistor-driven voltage regulation. The processing module can be implemented using a conventional microcontroller (MCU). The mute control module can be implemented using a combination of transistors and MOSFETs. The audio mixing device can be a mixing console or mixer with phantom power. In a specific implementation, the passive piezoelectric ceramic pickup is attached to the sound-producing surface of the instrument, serving as a trigger for the microphone automatic trigger switch module. The microphone is the instrument's active pickup microphone, connected to the audio mixing device (such as a mixing console or mixer) via a balanced signal cable. When the instrument is played, its surface vibrates, and the pickup vibrates accordingly, generating an electric current. The mute control module does not short-circuit the hot end R and the cold end Y of the balanced signal line, thereby automatically connecting the signal path between the microphone and the audio mixing device (turning on the active pickup microphone). When the instrument is played intermittently or stops playing, the pickup stops working, and the mute control module short-circuits the hot end R and the cold end Y of the balanced signal line, thereby disconnecting the signal path between the microphone and the audio mixing device (turning off the active pickup microphone).

[0052] In one possible implementation, such as Figure 2 The silent control module includes a first switch unit and a second switch unit;

[0053] The control terminal of the first switch unit serves as the control terminal of the silent control module. One end of its switch is electrically connected to the control terminal of the second switch unit, and the other end of its switch is electrically grounded.

[0054] The first and second ends of the second switch unit serve as the first and second input ends of the mute control module, respectively.

[0055] In this embodiment, the first switching unit can be implemented using a conventional transistor, and the second switching unit can be implemented using a conventional MOSFET. When the control terminal of the first switching unit receives a high level, its switch terminals are connected, resulting in a high level at the control terminal of the second switching unit. When the control terminal of the second switching unit is high, its switch terminals are connected, shorting the hot terminal R and the cold terminal Y of the balanced signal line, and the microphone enters mute mode. When the control terminal of the first switching unit receives a low level, its switch terminals are cut off, resulting in a low level at the control terminal of the second switching unit. When the control terminal of the second switching unit is low, its switch terminals are cut off, allowing the balanced signal line between the microphone and the audio mixing device to connect normally, and the microphone enters pickup mode.

[0056] In one possible implementation, such as Figure 3 The first switching unit includes a first NPN transistor Q1, a first resistor R1, and a second resistor R2;

[0057] The collector of the first NPN transistor Q1 is electrically connected to the first end of the first resistor R1, its emitter serves as the second terminal of the first switching unit, and its base is electrically connected to the first end of the second resistor R2.

[0058] The second end of the first resistor R1 serves as one end of the switch of the first switching unit;

[0059] The second end of the second resistor R2 serves as the control terminal of the first switching unit.

[0060] In this embodiment, the first NPN transistor Q1 can be a conventional NPN transistor. The first resistor R1 can be a conventional 1.5MΩ resistor, and the second resistor R2 can be a conventional 47KΩ resistor.

[0061] In one possible implementation, a first capacitor C1 is electrically connected between the second end of the first resistor R1 and the emitter of the first NPN transistor Q1.

[0062] In this embodiment, the first capacitor C1 can be a conventional 100nF capacitor.

[0063] In one possible implementation, the second switching unit includes a PMOS transistor M1, a third resistor R3, and a fourth resistor R4;

[0064] The gate of the PMOS transistor M1 is electrically connected to the first end of the third resistor R3 and the first end of the fourth resistor R4 as the control terminal of the second switching unit. Its source is electrically connected to the second end of the third resistor R3 as the first switching terminal of the second switching unit. Its drain is electrically connected to the second end of the fourth resistor R4 as the second switching terminal of the second switching unit.

[0065] In this embodiment, the first resistor R1, the third resistor R3, and the fourth resistor R4 have the same resistance value, and the resistance value of the first resistor R1, the third resistor R3, and the fourth resistor R4 can be 1.5MΩ.

[0066] The mute control logic is divided into a mute state when there is no signal and a working state when there is a signal.

[0067] No signal (mute state): When the MCU detects no valid signal input via the ADC through the PA2 pin, its PA1 pin outputs a high level. This high-level signal drives the first NPN transistor Q1 to conduct. After the first NPN transistor Q1 conducts, the gate of the PMOS transistor M1 receives sufficient drive voltage, and the PMOS transistor M1 then conducts. At this time, the PMOS transistor M1 short-circuits the hot terminal R and the cold terminal Y of the balance signal line, achieving microphone mute and effectively preventing environmental noise and other interference signals from entering the audio system.

[0068] When a signal is present (operating state): Once the MCU detects that the signal voltage of the ADC input is continuously higher than the set threshold through the PA2 pin, it determines that a valid audio signal exists, and the PA1 pin immediately outputs a low level. The low-level signal turns off the first NPN transistor Q1, and the gate of the PMOS transistor M1 loses its driving voltage and turns off. The balanced signal line resumes normal transmission, and the audio signal picked up by the microphone can be successfully transmitted to subsequent devices for processing.

[0069] In one possible implementation, such as Figure 4 The detection module includes a microphone interface J1, a second NPN transistor Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.

[0070] The first end of the pickup interface J1 is electrically connected to the first end of the second capacitor C2, the first end of the third capacitor C3, and the first end of the fifth resistor R5, respectively. Its second end is electrically connected to the second end of the second capacitor C2 and the emitter of the second NPN transistor Q2 and grounded.

[0071] The base of the second NPN transistor Q2 is electrically connected to the second terminal of the third capacitor C3 and the first terminal of the sixth resistor R6, respectively, and its collector is electrically connected to the second terminal of the sixth resistor R6, the first terminal of the seventh resistor R7, and the first terminal of the fourth capacitor C4, respectively.

[0072] The second end of the fifth resistor R5 is electrically connected to the second end of the seventh resistor R7 and connected to the working power supply VCC;

[0073] The second terminal of the fourth capacitor C4 serves as the output terminal of the detection module.

[0074] In this embodiment, the microphone interface J1 can be a conventional headphone jack. The second NPN transistor Q2 can be a conventional NPN transistor. The fifth resistor R5 can be a 200KΩ conventional resistor. The sixth resistor R6 can be a 1MΩ conventional resistor. The seventh resistor R7 can be a 10KΩ conventional resistor. The second capacitor C2, the third capacitor C3, and the fourth capacitor C4 can all be 100nF conventional capacitors.

[0075] The detection module acquires the voltage signal provided by the hot terminal R and cold terminal Y of the balanced signal line through a high-resistance resistor voltage divider sampling method. The high-resistance resistors minimize the impact on the original signal during sampling, ensuring signal integrity. The acquired voltage signal is input to the MCU's built-in ADC (analog-to-digital converter), which continuously monitors the signal voltage level. The MCU sets a corresponding threshold; when the voltage signal detected by the ADC is consistently higher than the threshold, a valid audio signal is considered to be present; otherwise, no signal is considered to be input. This detection mechanism can accurately identify audio signals, providing a reliable basis for subsequent mute control.

[0076] In one possible implementation, such as Figure 3 and Figure 5 It also includes the eighth resistor R8, the ninth resistor R9, and the Zener diode Z1;

[0077] The first end of the eighth resistor R8 and the first end of the ninth resistor R9 are electrically connected to the first input terminal and the second input terminal of the mute control module, respectively, and their respective second ends are electrically connected as working power supply terminals to provide the working power supply VCC.

[0078] The Zener diode Z1 is electrically connected between the power supply terminal and ground to stabilize the voltage.

[0079] In this embodiment, the microphone automatic trigger switch module adopts a self-powered design, directly powered by the XLR interface (e.g., Figure 9The 48V phantom power supply (J3) in the module provides the operating power, eliminating the need for an external power source. The power supply process is as follows: The 48V phantom power supply is first connected to a high-voltage resistor divider network, consisting of two 15kΩ high-voltage resistors, R8 (eighth resistor) and R9 (ninth resistor). This divider reduces the 48V voltage to a level acceptable to the MCU in the processing module. Then, it is regulated by a voltage regulator circuit consisting of Zener diode Z1 (which can be replaced by a low-dropout linear regulator LDO), outputting a stable 3.3V voltage to provide a reliable operating power supply (VCC) for the MCU. This design not only simplifies the power supply structure and reduces cost and space requirements but also ensures power supply stability and compatibility, making it suitable for all mixing consoles and audio interface devices equipped with a 48V phantom power supply.

[0080] In one specific implementation, after the microphone automatic trigger switch module is started, it directly draws power from the 48V phantom power supply to complete the MCU power-on initialization process. The first and second input terminals of the mute control module are short-circuited by default, that is, the balanced signal line is short-circuited, and the microphone is in a mute state, which can effectively avoid noise interference generated at the moment of power-on.

[0081] In one possible implementation, such as Figure 6 The power supply terminal of the processing module is electrically connected to the working power supply terminal, and is also electrically connected to a grounded fifth capacitor C5.

[0082] In this embodiment, the processing module can use a conventional microcontroller U1 as the MCU. The fifth capacitor C5 can be a 470μF electrolytic capacitor, with its positive terminal connected to the power supply and its negative terminal grounded. In silent mode, only the MCU operates in low-power mode, greatly reducing energy consumption and conforming to the green energy-saving design concept.

[0083] In one possible implementation, such as Figure 7 and Figure 8 It also includes an adjustment module electrically connected to the processing module for adjusting the mute delay time and sensitivity.

[0084] In this embodiment, the adjustment module can be constructed using a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and an indicator light LED1. The tenth resistor R10 can be a standard 100KΩ adjustable resistor, with its adjustable end connected to the PA3 pin of the MCU, allowing for mute delay time adjustment based on the processing module. The twelfth resistor R12 can also be a standard 100KΩ adjustable resistor, with its adjustable end connected to the PA4 pin of the MCU, allowing for sensitivity adjustment based on the processing module. The eleventh, thirteenth, and fourteenth resistors R14 can all be standard fixed-value resistors of 1KΩ. The indicator light LED1 can be a standard light-emitting diode, connected to the PA5 pin of the MCU via the fourteenth resistor R14, serving as a status indicator for the microphone automatic trigger switch module; for example, setting LED1 to illuminate when the microphone automatic trigger switch module is powered on.

[0085] In one specific implementation, such as Figure 9 J2 is the interface for connecting a microphone, J3 is the interface on the audio mixing device that provides phantom power, R is the hot end of the balanced signal cable, and Y is the cold end of the balanced signal cable.

[0086] This utility model also provides a sound mixing system, including an audio mixing device equipped with a phantom power module, a microphone automatic trigger switch module as described above, and a microphone suitable for phantom power;

[0087] The audio mixing device is electrically connected to the microphone automatic trigger switch module and the microphone, respectively.

[0088] In this embodiment, the audio mixing device is equipped with a phantom power module, which, through, as shown in... Figure 9 The J3 connector provides phantom power. The microphone connects to the J3 connector via the J2 connector. The balanced signal line (hot end R and cold end Y) between the J2 and J3 connectors is connected to the microphone auto-trigger switch module.

[0089] The above embodiments should not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent conversion fall within the protection scope of the present invention.

Claims

1. A microphone automatic trigger switch module, suitable for audio mixing devices that provide phantom power to the microphone, characterized in that, Includes a microphone, detection module, processing module, and mute control module; The microphone is electrically connected to the input terminal of the detection module; The output of the detection module is electrically connected to the input of the processing module; The output terminal of the processing module is electrically connected to the control terminal of the mute control module; The first and second input terminals of the mute control module are respectively electrically connected to the hot and cold ends of the balanced signal line between the audio mixing device and the microphone; The detection module is used to output a detection signal based on the pickup signal of the microphone; the processing module is used to output a control signal based on the detection signal; and the mute control module is used to control the short-circuit operation between its first input terminal and its second input terminal based on the control signal, thereby controlling the microphone to mute.

2. The microphone automatic trigger switch module according to claim 1, characterized in that, The silent control module includes a first switch unit and a second switch unit; The control terminal of the first switch unit serves as the control terminal of the silent control module. One end of its switch is electrically connected to the control terminal of the second switch unit, and the other end of its switch is electrically grounded. The first and second ends of the second switch unit serve as the first and second input ends of the mute control module, respectively.

3. The microphone automatic trigger switch module according to claim 2, characterized in that, The first switching unit includes a first NPN transistor, a first resistor, and a second resistor; The collector of the first NPN transistor is electrically connected to the first end of the first resistor, its emitter serves as the second terminal of the first switching unit, and its base is electrically connected to the first end of the second resistor. The second end of the first resistor serves as one end of the switch of the first switching unit; The second end of the second resistor serves as the control terminal of the first switching unit.

4. The microphone automatic trigger switch module according to claim 3, characterized in that, A first capacitor is electrically connected between the second end of the first resistor and the emitter of the first NPN transistor.

5. The microphone automatic trigger switch module according to claim 3, characterized in that, The second switching unit includes a PMOS transistor, a third resistor, and a fourth resistor; The gate of the PMOS transistor is electrically connected to the first end of the third resistor and the first end of the fourth resistor, respectively, as the control terminal of the second switching unit. Its source is electrically connected to the second end of the third resistor as the first switching terminal of the second switching unit, and its drain is electrically connected to the second end of the fourth resistor as the second switching terminal of the second switching unit.

6. The microphone automatic trigger switch module according to claim 1, characterized in that, The detection module includes a microphone interface, a second NPN transistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, and a fourth capacitor; The first end of the microphone interface is electrically connected to the first end of the second capacitor, the first end of the third capacitor, and the first end of the fifth resistor, respectively, and its second end is electrically connected to the second end of the second capacitor, the emitter of the second NPN transistor, and grounded. The base of the second NPN transistor is electrically connected to the second terminal of the third capacitor and the first terminal of the sixth resistor, respectively, and its collector is electrically connected to the second terminal of the sixth resistor, the first terminal of the seventh resistor, and the first terminal of the fourth capacitor, respectively. The second end of the fifth resistor is electrically connected to the second end of the seventh resistor and connected to the working power supply; The second terminal of the fourth capacitor serves as the output terminal of the detection module.

7. The microphone automatic trigger switch module according to claim 6, characterized in that, It also includes the eighth resistor, the ninth resistor, and the Zener diode; The first end of the eighth resistor and the first end of the ninth resistor are electrically connected to the first input terminal and the second input terminal of the mute control module, respectively, and their respective second ends are electrically connected as working power supply terminals to provide the working power. The Zener diode is electrically connected between the power supply terminal and ground to stabilize the voltage.

8. The microphone automatic trigger switch module according to claim 7, characterized in that, The power supply terminal of the processing module is electrically connected to the working power supply terminal, and is also electrically connected to a grounded fifth capacitor.

9. The microphone automatic trigger switch module according to claim 1, characterized in that, It also includes an adjustment module electrically connected to the processing module for adjusting the mute delay time and sensitivity.

10. A tuning system, characterized in that, Includes an audio mixing device equipped with a phantom power module, a microphone auto-trigger switch module as described in any one of claims 1 to 9, and a microphone suitable for phantom power; The audio mixing device is electrically connected to the microphone automatic trigger switch module and the microphone, respectively.

Images