CN114786112B - A device detection device for an external phantom powered analog microphone - Google Patents

Abstract

The invention discloses a device detection device for an external phantom power supply analog microphone, comprising a phantom power supply module, a phantom interface module, a detection module, a comparison module and a decoding module. The module and the comparison module are connected with one end of the phantom interface module, the other end of the phantom interface module is connected with a phantom analog microphone, the output end of the detection module is connected with an MCU, and the comparison module is connected with the conference host through the decoding module. In the present invention, the phantom power supply module supplies power to the phantom analog microphone through the phantom interface module, the audio signal collected by the phantom analog microphone is processed by the comparison module and the decoding module, and transmitted to the conference host, and the detection module detects whether the phantom analog microphone is online. Feedback to the conference host to make the conference host compatible with phantom analog microphones.

Description

A device detection device for an external phantom powered analog microphone

technical field

The invention relates to the technical field of audio input equipment, in particular to a device detection device for an external phantom power supply analog microphone.

Background technique

The conference host and conference microphone of the current digital conference system are used together, and are generally not compatible with phantom analog microphones. Under normal circumstances, the general phantom analog microphone is directly connected to the mixer or the analog power amplifier host with the phantom power supply function for audio sound reinforcement. However, the number of phantom analog microphones connected to the mixer or the analog power amplifier host with phantom power supply function is not displayed, which is not convenient for conference managers to manage microphones.

In the digital conference host connected to the conference microphone, the digital conference host can detect each conference microphone and display the number of microphones, but if the fantasy analog microphone is directly connected to the digital conference system, the analog microphone is generally not detected in the digital conference. Whether the system is online.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a device detection device for an external phantom powered analog microphone, which can solve the problem that the conference host cannot detect whether the phantom analog microphone is online in the digital conference system.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A device detection device for an externally connected phantom power supply analog microphone, characterized in that it comprises a phantom power supply module, a phantom interface module, a detection module, a comparison module and a decoding module, wherein an input end of the phantom power supply module is externally connected with a conference host, and the phantom power supply module is externally connected to a conference host. The output end of the power supply module, the input end of the detection module and the input end of the comparison module are all connected with one end of the phantom interface module, the other end of the phantom interface module is connected with a phantom analog microphone, and the output end of the detection module is connected with the MCU , the MCU is connected with the conference host, the output end of the comparison module is connected with the input end of the decoding module, and the output end of the decoding module is connected with the audio input end of the conference host.

Preferably, the phantom power supply module includes an inductor L2, an inductor L3, a capacitor C16, a capacitor C17, a capacitor C19, a capacitor C22, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode D5, a diode D6 and a power chip U2, one end of the inductor L3 is connected to the 36V power supply port of the conference host, and the other end of the inductor L3, one end of the capacitor C19, one end of the resistor R13 and one end of the inductor L2 are all connected to the power input terminal VIN of the power chip U2 , the other end of the resistor R13 and one end of the resistor R15 are both connected to the enable terminal EN of the power chip U2, the other end of the inductor L2 and the positive electrode of the diode D6 are both connected to the switch control terminal SW of the power chip U2, so The cathode of the diode D6, one end of the capacitor C16, one end of the capacitor C17 and one end of the resistor R12 are all connected to the anode of the diode D5, the cathode of the diode D5 is connected to the output end of the phantom interface module, and the other end of the resistor R12 , One end of the resistor R14 and one end of the resistor R16 are connected to the output voltage feedback terminal FB of the power chip U2, and the other end of the resistor R14 is connected to the comparator input terminal COMP of the power chip U2 through the capacitor C22. The other end, the other end of the resistor R15, the other end of the capacitor C16, the other end of the capacitor C17 and the other end of the resistor R16 are all grounded.

Preferably, the phantom interface module includes a XLR base J1, a resistor R8, a resistor R9, a capacitor C8, a capacitor C9 and a capacitor C10, one end of the capacitor C8, one end of the capacitor C9 and one end of the capacitor C10, and one end of the resistor R8 One end of the resistor R9 is connected to the negative electrode of the diode D5, the second output end of the XLR base J1, one end of the resistor R8 and the input end of the detection module are all connected to the positive input end of the comparison module, and the resistor R9 The other end of the XLR and the third output terminal of the XLR socket J1 are connected with the reverse input terminal of the comparison module, the input terminal of the XLR socket J1 is connected with the phantom analog microphone, and the first output terminal of the XLR socket J1 , the other end of the capacitor C8, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded.

Preferably, the detection module includes a resistor R1, a resistor R2 and a resistor R3, and the second output end of the XLR base J1, one end of the resistor R8 and the positive input end of the comparison module are all connected to one end of the resistor R1, so The other end of the resistor R1 and one end of the resistor R3 are both connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the ADC detection end of the MCU.

Preferably, the comparison module includes a capacitor C1, a capacitor C2, a capacitor C6, a capacitor C7, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a comparator U10A, and the other end of the resistor R9 is connected to the first end of the XLR base J1. The three output ends are all connected to one end of the capacitor C2, the second output end of the XLR base J1, one end of the resistor R8 and one end of the resistor R1 are all connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the resistor R6 one end of the capacitor C2 is connected to one end of the resistor R5, the other end of the resistor R6, one end of the capacitor C7 and one end of the resistor R7 are all connected to the positive input end of the comparator U10A, the resistor The other end of R5, one end of resistor R4 and one end of capacitor C1 are all connected to the inverting input end of comparator U10A, and the output end of comparator U10A, the other end of resistor R4 and the other end of capacitor C1 are all connected to the decoding module connect.

Preferably, the decoding module includes an audio codec chip U1, and the output end of the comparator U10A, the other end of the resistor R4 and the other end of the capacitor C1 are all connected to the audio input end of the conference host through the audio codec chip U1.

Compared with the prior art, the beneficial effect of the present invention is that: the phantom power supply module is used to supply power to the phantom analog microphone through the phantom interface module, and the audio signal collected by the phantom analog microphone is processed by the comparison module and the decoding module, and transmitted to the conference host. The detection module detects whether the phantom analog microphone is online, and feeds it back to the conference host, so that the digital conference host is compatible with the phantom analog microphone.

Description of drawings

FIG. 1 is a circuit diagram of the detection module described in the present invention.

FIG. 2 is a circuit diagram of the phantom power module described in the present invention.

FIG. 3 is a circuit diagram of the comparison module described in the present invention.

FIG. 4 is a circuit diagram of the decoding module described in the present invention.

FIG. 5 is a schematic diagram of the practical application of the device detection device for an external phantom powered analog microphone described in the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Below, in conjunction with accompanying drawing and specific embodiment, the present invention is further described:

As shown in Figure 1-5, a device detection device for an external phantom power supply analog microphone includes a phantom power supply module, a phantom interface module, a detection module, a comparison module and a decoding module. The input end of the phantom power supply module is connected to a conference host. , the output end of the phantom power supply module, the input end of the detection module and the input end of the comparison module are all connected with one end of the phantom interface module, the other end of the phantom interface module is connected with a phantom analog microphone, and the output of the detection module The MCU is connected with the conference host, the output end of the comparison module is connected with the input end of the decoding module, and the output end of the decoding module is connected with the audio input end of the conference host. In this embodiment, a phantom power supply module is used to connect with the phantom interface module, so as to supply power to the phantom analog microphone through the phantom interface module, and the audio signal collected by the phantom analog microphone is transmitted to the comparison module through the phantom interface module, and then transmitted by the comparison module. It is processed by the decoding module, and finally transmitted to the conference host by the decoding module. The transmission of the audio signal is carried out through the circuit connected between the modules. At the same time, the detection module is connected with the phantom interface module to obtain the change of the electrical signal, thereby converting the electrical signal. The change of the signal is fed back to the ADC detection port (pin) of the MCU, and the MCU is connected to the conference host, so that the MCU detects whether the phantom analog microphone is online, and then the MCU feeds back the detection result to the conference host, and the display of the conference host The screen displays the number of online phantom analog microphones. Further, the conference host can also judge whether the phantom analog microphone is normally connected according to the change of the electrical signal obtained by the ADC detection port (pin) of the MCU, so as to realize the conference host compatible with the phantom analog microphone.

Specifically, the phantom power supply module includes an inductor L2, an inductor L3, a capacitor C16, a capacitor C17, a capacitor C19, a capacitor C22, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode D5, a diode D6 and a power chip U2, one end of the inductor L3 is connected to the 36V power supply port of the conference host, and the other end of the inductor L3, one end of the capacitor C19, one end of the resistor R13 and one end of the inductor L2 are all connected to the power input terminal VIN of the power chip U2 , the other end of the resistor R13 and one end of the resistor R15 are both connected to the enable terminal EN of the power chip U2, the other end of the inductor L2 and the positive electrode of the diode D6 are both connected to the switch control terminal SW of the power chip U2, so The cathode of the diode D6, one end of the capacitor C16, one end of the capacitor C17 and one end of the resistor R12 are all connected to the anode of the diode D5, the cathode of the diode D5 is connected to the output end of the phantom interface module, and the other end of the resistor R12 , One end of the resistor R14 and one end of the resistor R16 are connected to the output voltage feedback terminal FB of the power chip U2, and the other end of the resistor R14 is connected to the comparator input terminal COMP of the power chip U2 through the capacitor C22. The other end, the other end of the resistor R15, the other end of the capacitor C16, the other end of the capacitor C17 and the other end of the resistor R16 are all grounded. Preferably, the phantom interface module includes a XLR base J1, a resistor R8, a resistor R9, a capacitor C8, a capacitor C9 and a capacitor C10, one end of the capacitor C8, one end of the capacitor C9 and one end of the capacitor C10, and one end of the resistor R8 One end of the resistor R9 is connected to the negative electrode of the diode D5, the second output end of the XLR base J1, one end of the resistor R8 and the input end of the detection module are all connected to the positive input end of the comparison module, and the resistor R9 The other end of the XLR and the third output terminal of the XLR socket J1 are connected with the reverse input terminal of the comparison module, the input terminal of the XLR socket J1 is connected with the phantom analog microphone, and the first output terminal of the XLR socket J1 , the other end of the capacitor C8, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded. Meanwhile, the detection module includes a resistor R1, a resistor R2 and a resistor R3. The second output end of the XLR base J1, one end of the resistor R8 and the positive input end of the comparison module are all connected to one end of the resistor R1. The other end of the resistor R1 and one end of the resistor R3 are both connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the ADC detection end of the MCU.

Preferably, the comparison module includes a capacitor C1, a capacitor C2, a capacitor C6, a capacitor C7, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a comparator U10A, and the other end of the resistor R9 is connected to the first end of the XLR base J1. The three output ends are all connected to one end of the capacitor C2, the second output end of the XLR base J1, one end of the resistor R8 and one end of the resistor R1 are all connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the resistor R6 one end of the capacitor C2 is connected to one end of the resistor R5, the other end of the resistor R6, one end of the capacitor C7 and one end of the resistor R7 are all connected to the positive input end of the comparator U10A, the resistor The other end of R5, one end of resistor R4 and one end of capacitor C1 are all connected to the inverting input end of comparator U10A, and the output end of comparator U10A, the other end of resistor R4 and the other end of capacitor C1 are all connected to the decoding module connect. The decoding module includes an audio codec chip U1, and the output end of the comparator U10A, the other end of the resistor R4 and the other end of the capacitor C1 are all connected to the audio input end of the conference host through the audio codec chip U1.

In this embodiment, when the phantom analog microphone is connected to the XLR base J1, the 36V power supply provided by the power supply port of the conference host is processed into 48V DC power by the phantom power supply module. set voltage. When the phantom analog microphone is not connected to the XLR socket J1, the point A in Figure 1 is 48V, the 48V current signal is connected to the resistor R9, the voltage to the point B is 48V, and the resistor R3 is connected to the GND through the resistor R1. The voltage at point E is 2.2V, the electrical signal flows through resistor R2, and the ADC sampling voltage at point F is 2.2V; when a phantom analog microphone is connected to the XLR socket J1, the 48V DC power at point A passes through resistor R8 and resistor R8 respectively. R9 provides a bias voltage to the phantom analog microphone, because the XLR socket J1 is connected to the phantom analog microphone, which is equivalent to an external load. The voltage at points B and C will be reduced to 30V. Connect the resistor R3, through the resistor R1 to the GND, the voltage at point E is 1.46V, the electrical signal flows through resistor R2, and the ADC sampling voltage at point F is 1.46V. Therefore, the MCU detects that the voltage value at point F is significantly different before and after the analog microphone is connected. Therefore, when the voltage detected by the MCU at point F is lower than 2V, it is determined that the XLR socket J1 has been connected to the phantom analog microphone, and the MCU can detect that the phantom analog microphone is connected, that is, the digital conference system can determine that the phantom analog microphone is connected online. , so as to connect to the digital conference host. The computer logs into the digital conference system software, and performs the function of realizing digital conference management on the digital conference host, digital conference unit and phantom analog microphone. Such as microphone sound reinforcement, microphone online quantity display, EQ adjustment, microphone sensitivity adjustment. When the voltage detected by the MCU at point F is higher than 2V, it is determined that the XLR socket J1 is not connected to the phantom analog microphone, and the MCU can detect that the phantom analog microphone is not connected, that is, the digital conference system can determine that the phantom analog microphone is not connected online. .

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (6)

1. a device detection device for an externally connected phantom power supply analog microphone, characterized in that: comprising a phantom power supply module, a phantom interface module, a detection module, a comparison module and a decoding module, the input end of the phantom power supply module is externally connected with a conference host, so The output end of the phantom power supply module, the input end of the detection module and the input end of the comparison module are all connected to one end of the phantom interface module, the other end of the phantom interface module is connected with a phantom analog microphone, and the output end of the detection module is connected to There is an MCU, the MCU is connected with the conference host, the output end of the comparison module is connected with the input end of the decoding module, and the output end of the decoding module is connected with the audio input end of the conference host; Connect to obtain the change of the electrical signal, so as to feed back the change of the electrical signal to the ADC detection port of the MCU. At the same time, the MCU is connected to the conference host, so that the MCU can detect whether the phantom analog microphone is online, and then the MCU will feed back the detection result to the conference. host. 2. The device detection device of claim 1, wherein the phantom power supply module comprises an inductor L2, an inductor L3, a capacitor C16, a capacitor C17, a capacitor C19, a capacitor C22, a resistor R12, Resistor R13, resistor R14, resistor R15, resistor R16, diode D5, diode D6 and power chip U2, one end of the inductor L3 is connected to the 36V power supply port of the conference host, the other end of the inductor L3, one end of the capacitor C19, One end of the resistor R13 and one end of the inductor L2 are both connected to the power input terminal VIN of the power chip U2, the other end of the resistor R13 and one end of the resistor R15 are both connected to the enable terminal EN of the power chip U2, and the inductor L2 is connected to the enabling terminal EN of the power chip U2. The other end and the anode of the diode D6 are all connected to the switch control terminal SW of the power chip U2. The cathode of the diode D6, one end of the capacitor C16, one end of the capacitor C17 and one end of the resistor R12 are all connected to the anode of the diode D5. The cathode of the diode D5 is connected to the output end of the phantom interface module, the other end of the resistor R12, one end of the resistor R14 and one end of the resistor R16 are all connected to the output voltage feedback end FB of the power chip U2, and the other end of the resistor R14 The capacitor C22 is connected to the comparator input terminal COMP of the power chip U2. The other end of the capacitor C19, the other end of the resistor R15, the other end of the capacitor C16, the other end of the capacitor C17 and the other end of the resistor R16 are all grounded. 3. The device detection device for an external phantom power supply analog microphone as claimed in claim 2, wherein the phantom interface module comprises a XLR seat J1, a resistor R8, a resistor R9, a capacitor C8, a capacitor C9 and a capacitor C10, One end of the capacitor C8, one end of the capacitor C9 and one end of the capacitor C10, one end of the resistor R8 and one end of the resistor R9 are all connected to the negative electrode of the diode D5, the second output end of the XLR seat J1, one end of the resistor R8 and The input end of the detection module is connected with the forward input end of the comparison module, the other end of the resistor R9 and the third output end of the XLR socket J1 are connected with the reverse input end of the comparison module, and the XLR socket J1 is connected to the reverse input end of the comparison module. The input end of the XLR is connected to the phantom analog microphone, and the first output end of the XLR base J1, the other end of the capacitor C8, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded. 4. The device detection device for an external phantom power supply analog microphone as claimed in claim 3, wherein the detection module comprises a resistor R1, a resistor R2 and a resistor R3, the second output end of the XLR base J1, the resistor One end of R8 and the positive input end of the comparison module are both connected to one end of the resistor R1, the other end of the resistor R1 and one end of the resistor R3 are both connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the ADC of the MCU Detection end connection. 5. The device detection device for an external phantom powered analog microphone as claimed in claim 4, wherein the comparison module comprises a capacitor C1, a capacitor C2, a capacitor C6, a capacitor C7, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and the comparator U10A, the other end of the resistor R9 and the third output end of the XLR base J1 are connected to one end of the capacitor C2, the second output end of the XLR base J1, one end of the resistor R8 and the resistor R1 One end of the capacitor C6 is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the resistor R6, the other end of the capacitor C2 is connected to one end of the resistor R5, the other end of the resistor R6 is connected to one end of the capacitor C7 and one end of the resistor R7 are connected to the forward input end of the comparator U10A, the other end of the resistor R5, one end of the resistor R4 and one end of the capacitor C1 are all connected to the reverse input end of the comparator U10A, the comparator The output end of U10A, the other end of resistor R4 and the other end of capacitor C1 are all connected to the decoding module. 6. The device detection device of an external phantom power supply analog microphone as claimed in claim 5, wherein the decoding module comprises an audio codec chip U1, the output end of the comparator U10A, the other end of the resistor R4 and a capacitor The other end of C1 is connected to the audio input end of the conference host through the audio codec chip U1.

Images