Dual antenna switching circuit for wireless microphone

Abstract

The utility model relates to the field of microphone antenna switching, and discloses a dual-antenna switching circuit for a wireless microphone. The circuit includes: a control module, a switch module, an identification module, an interface module, an external antenna, and an onboard antenna; the control module is connected to the switch module, the switch module is connected to the identification module, the interface module, and the onboard antenna, the identification module is also connected to the interface module, and the interface module is connected to the external antenna; the control module transmits a radio frequency signal to the switch module; the interface module monitors the access signal of the external antenna, the interface module transmits the access signal to the identification module, the identification module generates a switch switching signal based on the access signal, the identification module transmits the switch switching signal to the switch module, and the switch module controls the external antenna or the onboard antenna to receive the radio frequency signal based on the switch switching signal. In the embodiment of the utility model, the pickup distance of the microphone and the stability of the audio signal are increased, and the communication quality of the wireless microphone is improved.

Description

Technical Field

[0001] The utility model relates to the field of microphone antenna switching, in particular to a dual-antenna switching circuit of a wireless microphone. Background Art

[0002] Wireless microphones are usually divided into transmitters and receivers, which can communicate with each other using antennas. Nowadays, with the expansion of usage scenarios, such as outdoor live broadcasts, reality show recordings, film and television shooting, etc., wireless microphones are required to be able to receive sounds from farther distances to reduce sound collection problems caused by distance and improve sound reception conversion efficiency.

[0003] However, wireless microphones often have limited receiving distances due to limitations such as size, and various components inside them interfere with the transmission of antenna signals, thereby affecting the signal-to-noise ratio performance of the microphone. The use of external antennas in the prior art often requires a larger storage volume, which is contrary to the current pursuit of miniaturization of electronic devices. Therefore, due to the technical problem that the long receiving distance of the current microphone is incompatible with the small size of the microphone, a new technology is needed to solve the current problem. Utility Model Content

[0004] The main purpose of the utility model is to solve the technical problem that the current microphone has a long sound receiving distance and is incompatible with the small size of the microphone.

[0005] The utility model provides a dual-antenna switching circuit for a wireless microphone in a first aspect, characterized by comprising:

[0006] Control module, switch module, identification module, interface module, external antenna, onboard antenna;

[0007] The control module is connected to the switch module, the switch module is connected to the identification module, the interface module, and the onboard antenna, the identification module is also connected to the interface module, and the interface module is connected to the external antenna;

[0008] The control module transmits a radio frequency signal to the switch module; the interface module monitors the access signal of the external antenna, the interface module transmits the access signal to the identification module, the identification module generates a switch switching signal based on the access signal, the identification module transmits the switch switching signal to the switch module, and the switch module controls the external antenna or the onboard antenna to transmit the radio frequency signal based on the switch switching signal.

[0009] Optionally, in a first implementation of the first aspect of the utility model, the interface module includes: a first inductor, a first capacitor, and a second capacitor, the second capacitor is connected to the switch module, the first capacitor is connected to the first inductor, and the first inductor and the second capacitor are connected to the external antenna.

[0010] Optionally, in a second implementation of the first aspect of the utility model, the first capacitor is grounded.

[0011] Optionally, in a third implementation of the first aspect of the utility model, the identification module includes a MOS tube, and a gate of the MOS tube is connected to the first inductor.

[0012] Optionally, in a fourth implementation of the first aspect of the utility model, the drain of the MOS tube is connected to the switch module.

[0013] Optionally, in a fifth implementation of the first aspect of the utility model, the drain voltage of the MOS tube is 3V.

[0014] Optionally, in a sixth implementation of the first aspect of the utility model, the control module includes: a third capacitor and a signal source, the signal source is connected to the third capacitor, and the third capacitor is connected to the switch module.

[0015] Optionally, in a seventh implementation of the first aspect of the utility model, the external antenna includes: a trigger element, and the trigger element is grounded.

[0016] Optionally, in an eighth implementation of the first aspect of the utility model, the trigger element includes: an inductor element or a resistor element.

[0017] In the embodiment of the utility model, a circuit that allows the built-in onboard antenna and the external detachable antenna to switch freely is used to achieve multi-scenario applications. When close-range sound reception is required, the built-in onboard antenna comes into play; when receiving sound at a slightly longer distance, an external rubber stick antenna can be used to provide a more stable signal. This design extends the sound pickup distance and improves the stability of the audio signal while maintaining the volume of the microphone unchanged, thereby significantly improving the communication quality of the wireless microphone and providing users with a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an embodiment of a dual-antenna switching circuit of a wireless microphone in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of a specific embodiment of a dual-antenna switching circuit of a wireless microphone in an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of a specific embodiment of the external antenna of the dual-antenna switching circuit of the wireless microphone in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] An embodiment of the utility model provides a dual-antenna switching circuit for a wireless microphone.

[0022] The following will describe the embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0023] In the description of the embodiments disclosed in the present utility model, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0024] For ease of understanding, the specific process of the embodiment of the utility model is described below. Figure 1 , an embodiment of the dual antenna switching circuit of the wireless microphone in the embodiment of the utility model includes:

[0025] Control module 101, switch module 102, identification module 104, interface module 103, external antenna 105, onboard antenna 106;

[0026] The control module 101 is connected to the switch module 102, the switch module 102 is connected to the identification module 104, the interface module 103, and the onboard antenna 106, the identification module 104 is also connected to the interface module 103, and the interface module 103 is connected to the external antenna 105;

[0027] The control module 101 transmits the radio frequency signal to the switch module 102 , and the switch module 102 controls whether to connect to the external antenna 105 or the onboard antenna 106 .

[0028] The interface module 103 monitors the access signal of the external antenna 105, and the interface module 103 transmits the access signal to the identification module 104. The identification module 104 generates a switch switching signal based on the access signal, and the identification module 104 transmits the switch switching signal to the switch module 102. The switch module 102 controls the external antenna 105 or the onboard antenna 106 to transmit the radio frequency signal based on the switch switching signal.

[0029] The interface module 103 includes an interface for an external antenna 105 . The antenna base complies with common industry standards and can be connected to a specific external antenna 105 or a third-party external antenna.

[0030] When a third-party antenna is connected to the interface module 103, the identification module 104 and the switch module 102 also switch the circuit so as not to connect the onboard antenna 106. Usually, the third-party antenna is not provided with a connection trigger device, so the potential will not change automatically at this time, and a hardware switch (slide switch) or a software switch needs to be provided to manually switch the third-party antenna connection. When the external antenna 105 is connected, the trigger unit in the external antenna 105 causes the level change, and the external antenna 105 is connected without using the onboard antenna 106.

[0031] When not connected to the external antenna 105 , the switch module 102 is connected to the circuit of the onboard antenna 106 , and the microphone sends and receives radio frequency signals through the onboard antenna 106 .

[0032] For details, please refer to Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a specific embodiment of a dual antenna switching circuit of a wireless microphone in an embodiment of the utility model. Figure 2 The interface module includes: a first inductor L1, a first capacitor C1, and a second capacitor C4, the second capacitor C4 is connected to the switch module U1, the first capacitor C1 is connected to the first inductor L1, and the first inductor L1 and the second capacitor C4 are connected to the external antenna J1.

[0033] Specifically, the first capacitor C1 is grounded.

[0034] Furthermore, the identification module 104 includes a MOSFET G1, a gate of the MOSFET G1 is connected to the first inductor L1, a drain of the MOSFET G1 is connected to the switch module 102, and a drain voltage of the MOSFET G1 is 3V.

[0035] The control module 101 includes: a third capacitor C3 and a signal source RF-IN. The signal source RF-IN is connected to the third capacitor C3, and the third capacitor C3 is connected to the switch module U1.

[0036] Control principle: When the external antenna J1 (105) is connected to the microphone, that is, the external antenna J1 (105) is electrically connected to the microphone, the antenna interface potential changes from low to high, the gate G potential of the MOS tube pin in the identification module becomes high, and the drain D potential becomes high, causing the switch module U1 (102) to switch the external antenna J1 (105) circuit.

[0037] The identification module 104 is a MOS tube and related circuits. When there is no external antenna J1 (105), it is connected to the circuit of the onboard antenna P1 (106), and the microphone receives and sends radio frequency signals through the onboard antenna P1 (106); when the external antenna J1 (105) is connected, the trigger unit in the external antenna J1 (105) causes a level change, resulting in a change in the MOS tube voltage, so that the switch chip switches the related circuit to the external antenna J1 instead of using the onboard antenna P1 (106).

[0038] When a third-party antenna is connected to the interface module 103, the identification module 104 and the switch module U1 (102) also switch the circuit to not connect the onboard antenna P1 (106). Usually, the third-party antenna is not equipped with a trigger device, so the potential will not change automatically at this time. It is necessary to set a hardware switch (slide switch) or a software switch to manually switch the third-party antenna connection.

[0039] The switch module U1 (102) is a switch chip and peripheral circuits. The 6th pin CTRL of the switch chip U1 is connected to the 3rd pin drain D of the identification module MOS tube, and is also connected to the control module 101 to receive switching information from the identification module 104 and the RF module. The 5th pin of the switch module U1 (102) is connected to the control chip signal source RF-IN through the capacitor C3 to control the switching of the onboard antenna P1 (106) and the external antenna J1 (105) circuits.

[0040] The control module 101 includes a control chip and peripheral circuits to control the reception and transmission of microphone radio frequency signals and the switching signals of the antenna. The control module can also be an RF radio frequency module or a soc integrated chip.

[0041] For details, please refer to Figure 3 , Figure 3 The schematic diagram of the specific embodiment of the external antenna of the dual antenna switching circuit of the wireless microphone in the embodiment of the utility model, the external antenna includes: a trigger element m2, the trigger element m2 is grounded, and the trigger element m2 includes: an inductor element or a resistor element. A trigger device is added to the antenna, and the feed line is grounded through the trigger element. As a trigger device, when the external antenna is connected to the interface module 103, the voltage of the MOS tube pin of the identification module 104 can be changed, thereby causing the antenna connection of the switch module 102 to switch.

[0042] In the embodiment of the utility model, a circuit that allows the built-in onboard antenna and the external detachable antenna to switch freely is used to achieve multi-scenario applications. When close-range sound reception is required, the built-in onboard antenna comes into play; when receiving sound at a slightly longer distance, an external rubber stick antenna can be used to provide a more stable signal. This design extends the sound pickup distance and improves the stability of the audio signal while maintaining the volume of the microphone unchanged, thereby significantly improving the communication quality of the wireless microphone and providing users with a better user experience.

[0043] In addition, although each operation is described in a specific order, this should be understood as requiring such operation to be performed in the specific order shown or in a sequential order, or requiring that all illustrated operations should be performed to obtain desired results. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation can also be implemented in multiple implementations individually or in any suitable sub-combination mode.

[0044] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A dual-antenna switching circuit for a wireless microphone, characterized in that: include: Control module, switch module, identification module, interface module, external antenna, onboard antenna; The control module is connected to the switch module, the switch module is connected to the identification module, the interface module, and the onboard antenna, the identification module is also connected to the interface module, and the interface module is connected to the external antenna; The control module transmits a radio frequency signal to the switch module; the interface module monitors the access signal of the external antenna, the interface module transmits the access signal to the identification module, the identification module generates a switch switching signal based on the access signal, the identification module transmits the switch switching signal to the switch module, and the switch module controls the external antenna or the onboard antenna to receive the radio frequency signal based on the switch switching signal.

2. The dual antenna switching circuit of the wireless microphone according to claim 1, characterized in that: The interface module includes: a first inductor, a first capacitor, and a second capacitor, the second capacitor is connected to the switch module, the first capacitor is connected to the first inductor, and the first inductor and the second capacitor are connected to the external antenna.

3. The dual antenna switching circuit of the wireless microphone according to claim 2, characterized in that: The first capacitor is grounded.

4. The dual-antenna switching circuit of a wireless microphone according to claim 2, characterized in that: The identification module includes a MOS tube, and a gate of the MOS tube is connected to the first inductor.

5. The dual antenna switching circuit of the wireless microphone according to claim 4, characterized in that: The drain of the MOS tube is connected to the switch module.

6. The dual-antenna switching circuit of a wireless microphone according to claim 5, characterized in that: The drain voltage of the MOS tube is 3V.

7. The dual-antenna switching circuit of a wireless microphone according to claim 1, characterized in that: The control module includes: a third capacitor and a signal source, the signal source is connected to the third capacitor, and the third capacitor is connected to the switch module.

8. The dual-antenna switching circuit of a wireless microphone according to claim 1, characterized in that: The external antenna includes a trigger element, and the trigger element is grounded.

9. The dual-antenna switching circuit of a wireless microphone according to claim 8, characterized in that: The trigger element includes: an inductor element or a resistor element.

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