Microphone isolation circuit, wireless microphone and wireless microphone system

Abstract

The present invention provides a microphone isolation circuit, a wireless microphone and a wireless microphone system, wherein the microphone isolation circuit comprises: a radio frequency module and a control module, and the microphone isolation circuit further comprises: an isolation module and an antenna module; the radio frequency module is connected to the antenna module and the control module respectively, and the antenna module is connected to the control module through the isolation module; the radio frequency antenna signal frequency generated by the radio frequency module is isolated through the isolation module; the power supply ripple current output by the control module is filtered, and the filtered power supply current is output to the radio frequency module. The present invention enables the microphone to charge normally and stably transmit radio frequency signals by isolating the radio frequency antenna signal and filtering the power supply ripple current.

Description

Technical Field

[0001] The present invention relates to the technical field of microphones, and in particular to a microphone isolation circuit, a wireless microphone, and a wireless microphone system. Background Art

[0002] With the advent of the high-speed information age, wireless microphones have completely replaced the original wired microphones, and now wireless microphones have become popular in offices, homes and entertainment places, such as office conference room microphones, car microphones, karaoke room microphones, etc.

[0003] In actual applications, in order to make the microphone's appearance look good, the USB charging port of the microphone is generally set at the bottom of the microphone. However, such a design can easily cause the USB charging port and the radio frequency signal to interfere with each other, resulting in the microphone being unable to charge normally and the radio frequency signal transmission being unstable.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a microphone isolation circuit, a wireless microphone and a wireless microphone system, aiming to solve the technical problems in the prior art that the USB charging port and the radio frequency signal interfere with each other, resulting in the microphone being unable to charge normally and the radio frequency signal transmission being unstable.

[0006] To achieve the above object, the present invention provides a microphone isolation circuit, the microphone isolation circuit comprising: a radio frequency module and a control module, the microphone isolation circuit further comprising: an isolation module and an antenna module;

[0007] The radio frequency module is connected to the antenna module and the control module respectively, and the antenna module is connected to the control module through the isolation module;

[0008] The isolation module is used to isolate the frequency of the radio frequency antenna signal generated by the radio frequency module;

[0009] The isolation module is further configured to filter the power supply ripple current output by the control module, and output the filtered power supply current to the RF module and the antenna module.

[0010] Optionally, the microphone isolation circuit further includes: a charging interface module, and the isolation module includes: a first isolation unit and a second isolation unit;

[0011] The first isolation unit is connected to the system power input terminal and the charging interface module respectively, and the second isolation unit is connected to the antenna module and the control module respectively;

[0012] The first isolation unit is used to isolate the frequency of the radio frequency antenna signal generated by the radio frequency module;

[0013] The second isolation unit is configured to filter the power supply ripple current output by the control module and output the filtered power supply current to the RF module.

[0014] Optionally, the first isolation unit includes: a first isolation inductor;

[0015] One end of the first isolation inductor is connected to the charging interface module, and the other end of the first isolation inductor is connected to the system power input end.

[0016] Optionally, the second isolation unit includes: a second isolation inductor;

[0017] One end of the second isolation inductor is connected to the antenna module, and the other end of the second isolation inductor is connected to the control module.

[0018] Optionally, the antenna module includes: an antenna, a button metal bracket, and a charging port metal shell;

[0019] The antenna is connected to the key metal bracket, the key metal bracket is connected to the charging interface metal shell, and the charging interface metal shell is connected to the isolation module.

[0020] Optionally, the control module includes: a charging control unit, a micro control unit and a power ground;

[0021] The micro control unit is respectively connected to the charging control unit, the power ground, the isolation module and the radio frequency module; the charging control unit is connected to the charging interface module; the power ground is connected to the charging interface module and the isolation module;

[0022] The charging control unit is used to adjust the power supply voltage input to the system power input terminal;

[0023] The micro control unit is used to configure the power of the signal transmitted by the radio frequency module.

[0024] Optionally, the radio frequency module is used to transmit a wireless microphone signal of U-band frequency.

[0025] Optionally, the charging interface module includes: a charging seat;

[0026] The charging base is provided with a power input terminal and a ground pin, wherein the power input terminal is connected to the isolation module, and the ground pin is connected to the control module.

[0027] To achieve the above object, the present invention further provides a wireless microphone, which includes the above microphone isolation circuit.

[0028] To achieve the above object, the present invention further provides a wireless microphone system, which includes the above wireless microphone.

[0029] The present invention provides a microphone isolation circuit, a wireless microphone, and a wireless microphone system. The microphone isolation circuit includes a radio frequency module and a control module. The microphone isolation circuit also includes an isolation module and an antenna module. The radio frequency module is connected to the antenna module and the control module, respectively, and the antenna module is connected to the control module via the isolation module. The radio frequency antenna signal frequency generated by the radio frequency module is isolated by the isolation module. The power supply ripple current output by the control module is filtered and the filtered power supply current is output to the radio frequency module. By isolating the radio frequency antenna signal and filtering the power supply ripple current, the present invention enables the microphone to charge normally and stably transmit radio frequency signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 A schematic structural diagram of a first embodiment of the present invention;

[0032] Figure 2 A schematic structural diagram of a second embodiment of the present invention;

[0033] Figure 3 This is a circuit diagram of an isolation module according to a second embodiment of the present invention.

[0034] Description of Figure Numbers:

[0035]

[0036]

[0037] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the microphone isolation circuit proposed by the present invention. Figure 1 A first embodiment of a microphone isolation circuit of the present invention is provided.

[0043] In this embodiment, the microphone isolation circuit includes: a radio frequency module 10 and a control module 20, and the microphone isolation circuit also includes: an isolation module 30 and an antenna module 40;

[0044] The RF module 10 is connected to the antenna module 40 and the control module 20 respectively, and the antenna module 40 is connected to the control module 20 via the isolation module 30;

[0045] It should be understood that the RF module 10 is a module for transmitting wireless microphone signals of the U-band frequency. After generating the RF signal, the RF module 10 modulates the RF signal with the human voice signal to obtain a modulated RF signal, and transmits the modulated RF signal through the antenna module 40. The control module 20 is used to communicate with each module to obtain data from the module and control the module, such as controlling the RF signal and transmission power of the RF module 10. The isolation module 30 is used to isolate the RF antenna signal frequency generated by the RF module 10 and filter the power supply ripple current output by the control module 20 to prevent the RF signal transmitted by the RF module 10 from affecting the charging function of the microphone and the power supply ripple current from interfering with the stability of the RF signal transmitted by the RF module 10. The antenna module 40 is used to cooperate with the RF module 10 to send RF signals.

[0046] It should be noted that in a specific implementation, the external input current flows into the control module 20 after passing through the isolation module 30. The control module 20 outputs a power supply ripple current, which is then filtered by the isolation module 30 and input into the RF module 10. Ripple current refers to the higher-order harmonic components in the current. This ripple current can affect the stability of the RF signal transmitted by the RF module 10, so it is necessary for the isolation module 30 to filter it.

[0047] This embodiment provides a microphone isolation circuit, which includes: a radio frequency module and a control module, and further includes: an isolation module and an antenna module; the radio frequency module is connected to the antenna module and the control module respectively, and the antenna module is connected to the control module via the isolation module; the radio frequency antenna signal frequency generated by the radio frequency module is isolated by the isolation module; the power supply ripple current output by the control module is filtered, and the filtered power supply current is output to the radio frequency module. By isolating the radio frequency antenna signal and filtering the power supply ripple current, the present invention enables the microphone to charge normally and stably transmit radio frequency signals.

[0048] Reference Figure 2 , Figure 2 This is a schematic structural diagram of a second embodiment of a microphone isolation circuit proposed in the present invention. The second embodiment of a microphone isolation circuit proposed in the present invention is based on the first embodiment of the microphone isolation circuit.

[0049] In this embodiment, the microphone isolation circuit further includes: a charging interface module 50 , and the isolation module 30 includes: a first isolation unit 301 and a second isolation unit 302 ;

[0050] The first isolation unit 301 is connected to the system power input terminal 60 and the charging interface module 50 respectively, and the second isolation unit 302 is connected to the antenna module 40 and the control module 20 respectively.

[0051] It should be understood that the charging interface module 50 is an interface for charging the microphone, and the interface for charging the microphone can be a USB interface or a Type-C interface. The first isolation unit 301 is arranged between the above-mentioned microphone charging interface and the system power input terminal 60, and is used to isolate the RF antenna signal so that the RF antenna signal affects the charging of the microphone. The system power input terminal 60 refers to an external port for charging the microphone. The second isolation unit 302 is arranged between the antenna module 401 and the power ground 201, and is used to filter the power supply ripple current to prevent the power supply ripple current from affecting the stability of the RF signal sent by the antenna.

[0052] In this embodiment, the first isolation unit 301 includes: a first isolation inductor L1;

[0053] One end of the first isolation inductor L1 is connected to the charging interface module 50 , and the other end of the first isolation inductor L1 is connected to the system power input terminal 60 .

[0054] It can be understood that the inductor has the function of hindering current changes. The first isolation inductor L1 can ensure that when the microphone is charging, the current flowing from the system power input end into the microphone charging interface is not affected by the radio frequency signal, thereby making the charging function of the microphone more stable.

[0055] In this embodiment, the second isolation unit 302 includes: a second isolation inductor L2;

[0056] One end of the second isolation inductor L2 is connected to the antenna module 40 , and the other end of the second isolation inductor L2 is connected to the control module 20 .

[0057] It is understandable that the second isolation inductor L2 is provided between the antenna module 401 and the power ground 201 to filter the power supply ripple current to prevent the power supply ripple current from affecting the stability of the RF signal transmitted by the antenna.

[0058] In this embodiment, the antenna module 40 includes: an antenna, a button metal bracket and a charging port metal shell;

[0059] The antenna is connected to the key metal bracket, the key metal bracket is connected to the charging interface metal shell, and the charging interface metal shell is connected to the isolation module.

[0060] It should be noted that in this embodiment, the metal bracket of the microphone button and the metal shell of the charging port are not directly connected to the power ground 201, but are part of the antenna module 40, so that the signal transmission function and signal receiving function of the antenna module are greatly enhanced, and the signal reception angle and signal transmission distance of the antenna module 40 are also improved.

[0061] It should be understood that in this embodiment, in addition to the microphone isolation circuit, the microphone should also have common microphone modules such as an audio processing module to collect and compress audio, a receiving module to receive audio signals through an antenna, and a button module for users to switch functions.

[0062] In this embodiment, the control module 20 includes: a charging control unit 203, a micro control unit 202 and a power ground 201;

[0063] The micro control unit 202 is respectively connected to the charging control unit 203, the power ground 201, the isolation module 30 and the RF module 10, the charging control unit 203 is connected to the charging interface module 50, and the power ground 201 is connected to the charging interface module 50 and the isolation module 30.

[0064] It is understood that the charging control unit 203 is used to regulate the power supply voltage input from the microphone charging port and then use the regulated power supply voltage to charge the microphone battery. The microcontroller unit is used to send a control signal to the RF module 10. The RF module generates an RF signal based on the control signal, and the RF signal is then transmitted by the antenna module 40. The control signal is mainly used to control the frequency and power of the RF signal. The RF signal transmitted by the RF module 10 is in the U band, which is a mobile communication frequency band.

[0065] This embodiment provides a specific structure of a microphone isolation circuit, which also includes a charging interface module, which is used to connect to the external system power input segment to charge the microphone; in this embodiment, since the isolation module is arranged between the charging interface module and the system power input segment, the charging function of the microphone is less affected by the frequency of the radio frequency signal emitted by the radio frequency module, and the microphone can be charged normally. In this embodiment, the metal bracket of the button and the metal shell of the charging interface are used as part of the antenna, which expands the transmission and receiving range of the antenna and improves the antenna performance; the isolation module is also used to filter the power supply ripple current, reduce the interference of the power supply ripple current on the antenna, and further improve the stability of the microphone transmission signal.

[0066] In this embodiment, the charging interface module includes: a charging base;

[0067] The charging base is provided with a power input terminal and a ground pin, wherein the power input terminal is connected to the isolation module 30 , and the ground pin is connected to the control module 20 .

[0068] It should be noted that the charging stand can be a USB charging stand or a Type-C charging stand. When the microphone is charging, the external power supply will charge the microphone through the system power input terminal 60. However, due to the influence of the radio frequency signal, it may interfere with the charging process of the microphone. Therefore, a first isolation inductor 301 is set between the charging stand and the system power input terminal 60 to ensure the stability of the input current.

[0069] In addition, to achieve the above-mentioned purpose, the present invention also provides a wireless microphone, which includes the above-mentioned microphone isolation circuit.

[0070] In addition, to achieve the above-mentioned purpose, the present invention also provides a microphone system, which includes the above-mentioned wireless microphone.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A microphone isolation circuit, the microphone isolation circuit comprising: The radio frequency module and the control module are characterized in that the microphone isolation circuit further comprises: an isolation module and an antenna module; Wherein, the radio frequency module is connected to the antenna module and the control module respectively, and the antenna module is connected to the control module through the isolation module; The isolation module is used to isolate the frequency of the radio frequency antenna signal generated by the radio frequency module; The isolation module is further used to filter the power supply ripple current output by the control module, and output the filtered power supply current to the RF module and the antenna module; The control module is used to adjust the power supply voltage and charge the microphone; The control module is also used to control and adjust the frequency and power of the radio frequency signal of the radio frequency module.

2. The microphone isolation circuit according to claim 1, characterized in that: The microphone isolation circuit further includes: a charging interface module, and the isolation module includes: a first isolation unit and a second isolation unit; The first isolation unit is connected to the system power input terminal and the charging interface module respectively, and the second isolation unit is connected to the antenna module and the control module respectively; The first isolation unit is used to isolate the frequency of the radio frequency antenna signal generated by the radio frequency module; The second isolation unit is used to filter the power supply ripple current output by the control module, and output the filtered power supply current to the RF module.

3. The microphone isolation circuit according to claim 2, characterized in that: The first isolation unit includes: a first isolation inductor; One end of the first isolation inductor is connected to the charging interface module, and the other end of the first isolation inductor is connected to the system power input terminal.

4. The microphone isolation circuit according to claim 3, characterized in that: The second isolation unit includes: a second isolation inductor; One end of the second isolation inductor is connected to the antenna module, and the other end of the second isolation inductor is connected to the control module.

5. The microphone isolation circuit according to claim 4, characterized in that: The antenna module includes: an antenna, a button metal bracket and a charging port metal shell; The antenna is connected to the key metal bracket, the key metal bracket is connected to the charging interface metal shell, and the charging interface metal shell is connected to the isolation module.

6. The microphone isolation circuit according to claim 5, characterized in that: The control module includes: a charging control unit, a micro control unit and a power supply ground; The micro control unit is respectively connected to the charging control unit, the power ground, the isolation module and the radio frequency module, the charging control unit is connected to the charging interface module, and the power ground is connected to the charging interface module and the isolation module; The charging control unit is used to adjust the power supply voltage input to the system power input terminal; The micro control unit is used to configure the power of the signal transmitted by the radio frequency module.

7. The microphone isolation circuit according to claim 6, characterized in that: The radio frequency module is used to transmit a wireless microphone signal of a U-band frequency.

8. The microphone isolation circuit according to claim 7, characterized in that: The charging interface module includes: a charging seat; The charging base is provided with a power input terminal and a ground pin, wherein the power input terminal is connected to the isolation module, and the ground pin is connected to the control module.

9. A wireless microphone, characterized in that: The wireless microphone comprises the microphone isolation circuit according to any one of claims 1-8.

10. A wireless microphone system, characterized in that: The wireless microphone system comprises the wireless microphone according to claim 9.

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