A hand-held handset

Abstract

The utility model discloses a handheld telephone transmitter and receiver, including low pressure linear voltage stabilizing circuit, microphone circuit, wireless audio transmission circuit, analog switch circuit, power amplifier circuit and LoRa circuit, the utility model discloses through LoRa long distance communication and local wireless audio transmission double mode cooperation, realizes super 1km anti -interference audio and control signal synchronous transmission, analog switch dynamic switching audio channel promotes multi -device compatibility, and low pressure linear voltage stabilizing circuit cooperates multistage filter and significantly reduces system power consumption and noise, and the whole link height integrated design gives consideration to portability and industrial environment adaptability, solved the communication bottleneck of traditional equipment under complex scene.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, specifically to a handheld microphone. Background Technology

[0002] Traditional handheld communication devices often face problems such as unstable audio transmission, weak anti-interference capabilities, and high power consumption in complex electromagnetic environments or long-distance scenarios. Wired intercom systems are cumbersome to wire, while conventional wireless devices (such as Bluetooth / WiFi) are limited by transmission distance and wall penetration capabilities, making it difficult to meet the needs of scenarios such as field operations and industrial inspections. Existing transceivers mostly use a single communication mode, lacking remote control and status feedback functions, resulting in insufficient operational flexibility. Utility Model Content

[0003] In view of this, the main objective of this utility model is to provide a handheld microphone.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] This utility model provides a handheld microphone, including a low-voltage linear regulator circuit, a microphone circuit, a wireless audio transmission circuit, an analog switch circuit, a power amplifier circuit, and a LoRa circuit.

[0006] The low-voltage linear regulator circuit is used to provide operating voltage for the microphone circuit, the wireless audio transmission circuit, the analog switch circuit, and the power amplifier circuit.

[0007] The audio signal output terminal of the microphone circuit is connected to the audio signal input terminal of the wireless audio transmission circuit.

[0008] The signal output terminal of the analog switch circuit is connected to the control signal input terminal of the wireless audio transmission circuit, and is used to control the switching of the audio signal channel inside the wireless audio transmission circuit.

[0009] The audio signal input terminal of the power amplifier circuit is connected to the audio signal output terminal of the wireless audio transmission circuit.

[0010] The LoRa circuit is communicatively connected to the control interface of the wireless audio transmission circuit, and is used to receive remote control commands or send device status information via the LoRa wireless communication protocol.

[0011] In the above scheme, the low-voltage linear regulator circuit includes a low-voltage linear regulator, a power output terminal, a first capacitor, a second capacitor, a third capacitor, a first resistor, and a first inductor. The first terminal of the third capacitor is connected to the power input terminal and the IN terminal of the low-voltage linear regulator. The EN terminal of the low-voltage linear regulator is connected to the first terminal of the first resistor. The OUT terminal of the low-voltage linear regulator is connected to the first terminal of the first inductor and the first terminal of the second capacitor. The second terminal of the first capacitor is connected to the power output terminal and the first terminal of the first capacitor. The second terminals of the first capacitor, the second terminals of the second capacitor, and the second terminals of the third capacitor are all grounded.

[0012] In the above scheme, the microphone circuit includes a microphone, a third inductor, a fourth inductor, and a seventh resistor. The first end of the seventh resistor is connected to the first end of the third inductor and the microphone, respectively. The second end of the seventh resistor is connected to the first end of the fourth inductor and then grounded.

[0013] In the above scheme, the wireless audio transmission circuit includes a wireless audio transmission chip, a first tantalum capacitor, an eighteenth capacitor, and a fourth resistor. The CS terminal of the wireless audio transmission chip is connected in series with the fourth resistor and then connected to the power output terminal. The +3.3V terminal of the wireless audio transmission chip is connected to the first terminal of the eighteenth capacitor, the first terminal of the first tantalum capacitor, and the power output terminal, respectively. The MIC_P_IN terminal of the wireless audio transmission chip is connected to the second terminal of the third inductor, and the MIC_N_IN terminal of the wireless audio transmission chip is connected to the second terminal of the fourth inductor.

[0014] In the above scheme, the analog switch circuit includes an analog switch chip. The VCC terminal of the analog switch chip is connected to the power output terminal, the S1B terminal of the analog switch chip is connected to the RXD terminal of the wireless audio transmission chip, and the S1C terminal of the analog switch chip is connected to the TXD terminal of the wireless audio transmission chip.

[0015] In the above scheme, the power amplifier circuit includes an amplifier chip, a sixth resistor, a seventh resistor, an eighth resistor, a tenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a fuse, a power amplifier interface, and a power amplifier switch. The SHDN terminal of the amplifier chip is connected to the first terminal of the tenth capacitor, the first terminal of the sixth resistor, and the power amplifier switch, respectively. The second terminal of the sixth resistor and the second terminal of the tenth capacitor are both grounded. The IN+ terminal of the amplifier chip is connected to the seventh resistor and the twenty-first capacitor in series and then grounded. The IN- terminal of the amplifier chip is connected to the LINE_OUT terminal of the wireless audio transmission chip in series with the eighth resistor and the twenty-second capacitor. The VDD terminal of the amplifier chip is connected to the power output terminal in series with the fuse.

[0016] In the above scheme, the LoRa circuit includes a bidirectional diode, an eighth capacitor, a ninth capacitor, a second inductor, and an antenna. The first end of the bidirectional diode is connected to the first end of the ninth capacitor, the first end of the second inductor, and the ANT terminal of the wireless audio transmission chip. The second end of the second inductor is connected to the antenna and the first end of the eighth capacitor. The second ends of the eighth capacitor, the ninth capacitor, and the bidirectional diode are all grounded.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention achieves synchronous transmission of audio and control signals over 1km with anti-interference capabilities through dual-mode collaboration of LoRa long-distance communication and local wireless audio transmission; dynamic switching of audio channels via analog switches enhances compatibility with multiple devices; low-voltage linear regulator circuits combined with multi-level filtering significantly reduce system power consumption and noise; and the highly integrated design across the entire link balances portability and industrial environment adaptability, solving the communication bottleneck of traditional equipment in complex scenarios. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a handheld microphone according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the low-voltage linear regulator circuit in a handheld microphone according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the microphone circuit in a handheld microphone according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the wireless audio transmission circuit in a handheld microphone according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the analog switching circuit in a handheld microphone according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the power amplifier circuit in a handheld microphone according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0029] This utility model embodiment provides a handheld microphone, such as Figure 1-6 As shown, it includes a low-voltage linear regulator circuit, a microphone circuit, a wireless audio transmission circuit, an analog switch circuit, a power amplifier circuit, and a LoRa circuit.

[0030] The low-voltage linear regulator circuit is used to provide operating voltage for the microphone circuit, the wireless audio transmission circuit, the analog switch circuit, and the power amplifier circuit.

[0031] The audio signal output terminal of the microphone circuit is connected to the audio signal input terminal of the wireless audio transmission circuit.

[0032] The signal output terminal of the analog switch circuit is connected to the control signal input terminal of the wireless audio transmission circuit, and is used to control the switching of the audio signal channel inside the wireless audio transmission circuit.

[0033] The audio signal input terminal of the power amplifier circuit is connected to the audio signal output terminal of the wireless audio transmission circuit.

[0034] The LoRa circuit is communicatively connected to the control interface of the wireless audio transmission circuit, and is used to receive remote control commands or send device status information via the LoRa wireless communication protocol.

[0035] like Figure 2 As shown, the low-voltage linear regulator circuit includes a low-voltage linear regulator U1, a power output terminal LORA_3V3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, and a first inductor L1. The first terminal of the third capacitor C3 is connected to the power input terminal LDOIN and the IN terminal of the low-voltage linear regulator U1. The EN terminal of the low-voltage linear regulator U1 is connected to the first terminal of the first resistor R1. The OUT terminal of the low-voltage linear regulator U1 is connected to the first terminal of the first inductor L1 and the first terminal of the second capacitor C2. The second terminal of the first inductor L1 is connected to the power output terminal LORA_3V3 and the first terminal of the first capacitor C1. The second terminals of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all grounded.

[0036] like Figure 3 As shown, the microphone circuit includes a microphone LORA_MIC_IN, a third inductor L3, a fourth inductor L4, and a seventh resistor R7. The first end of the seventh resistor R7 is connected to the first end of the third inductor L3 and the microphone LORA_MIC_IN, respectively. The second end of the seventh resistor R7 is connected to the first end of the fourth inductor L4 and then grounded.

[0037] like Figure 4 As shown, the wireless audio transmission circuit includes a wireless audio transmission chip U4, a first tantalum capacitor EC1, an eighteenth capacitor C18, and a fourth resistor R4. The CS terminal of the wireless audio transmission chip U4 is connected in series with the fourth resistor and then connected to the power output terminal LORA_3V3. The +3.3V terminal of the wireless audio transmission chip U4 is connected to the first terminal of the eighteenth capacitor C18, the first terminal of the first tantalum capacitor EC1, and the power output terminal LORA_3V3, respectively. The MIC_P_IN terminal of the wireless audio transmission chip U4 is connected to the second terminal of the third inductor L3, and the MIC_N_IN terminal of the wireless audio transmission chip U4 is connected to the second terminal of the fourth inductor L4.

[0038] like Figure 5 As shown, the analog switch circuit includes an analog switch chip U2. The VCC terminal of the analog switch chip U2 is connected to the power output terminal LORA_3V3. The S1B terminal of the analog switch chip U2 is connected to the RXD terminal of the wireless audio transmission chip U4. The S1C terminal of the analog switch chip U2 is connected to the TXD terminal of the wireless audio transmission chip U4.

[0039] like Figure 6 As shown, the power amplifier circuit includes an amplifier chip U11, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a tenth capacitor C10, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a fuse FB1, a power amplifier interface SPK, and a power amplifier switch PA_SHDN. The SHDN terminal of the amplifier chip U11 is connected to the first terminal of the tenth capacitor C10, the first terminal of the sixth resistor R6, and the power amplifier switch PA_SHDN. The second terminals of the sixth resistor R6 and the tenth capacitor C10 are both grounded. The IN+ terminal of the amplifier chip U11 is connected to the seventh resistor R7 and the twenty-first capacitor C21 in series and then grounded. The IN- terminal of the amplifier chip U11 is connected to the LINE_OUT terminal of the wireless audio transmission chip U4 in series with the eighth resistor R8 and the twenty-second capacitor C22. The VDD terminal of the amplifier chip U11 is connected to the power output terminal LORA_3V3 in series with the fuse FB1.

[0040] like Figure 4 As shown, the LoRa circuit includes a bidirectional diode ED1, an eighth capacitor C8, a ninth capacitor C9, a second inductor L2, and an antenna ANT. The first terminal of the bidirectional diode ED1 is connected to the first terminal of the ninth capacitor C9, the first terminal of the second inductor L2, and the ANT terminal of the wireless audio transmission chip U4. The second terminal of the second inductor L2 is connected to the antenna ANT and the first terminal of the eighth capacitor C8. The second terminals of the eighth capacitor C8, the ninth capacitor C9, and the second terminal of the bidirectional diode ED1 are all grounded.

[0041] The working principle of this utility model is as follows:

[0042] like Figure 1-6As shown, the microphone circuit converts the sound signal into an electrical signal, which is then filtered by the third inductor L3 and the fourth inductor L4 before being input to the MIC_P_IN / MIC_N_IN terminals of the wireless audio transmission chip U4. The audio signal is processed internally by the wireless audio transmission chip U4 and sent to the local receiving device (such as headphones) through its ANT terminal. The LoRa circuit (including bidirectional diode ED1 and antenna ANT) receives remote commands, which are parsed by the control interface of the wireless audio transmission chip U4, driving the analog switch chip U2 to switch the RXD / TXD channels inside the wireless audio transmission chip U4. At the same time, device status information is transmitted back to the remote end via LoRa. The audio signal output by the wireless audio transmission chip U4 is coupled to the power amplifier circuit through the twenty-second capacitor C22, and the amplifier chip U11 drives the power amplifier interface SPK to produce sound. The fuse FB1 provides overcurrent protection, and the power amplifier switch PA_SHDN controls the SHDN terminal of the amplifier chip U11 to achieve manual start and stop. The low-voltage linear regulator circuit U1 converts the input voltage to a stable 3.3V (LORA_3V3), which is then filtered by the first inductor L1 and multiple capacitors to power the entire system, ensuring the clean operating voltage of each module. The analog switch chip U2 receives control signals (such as LoRa commands) through its IN terminal and dynamically switches the connection between the S1B / S1C terminals and the RXD / TXD terminals of U4, enabling flexible configuration of the audio signal channels.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A hand-held handset, characterized in that It includes low-voltage linear regulator circuits, microphone circuits, wireless audio transmission circuits, analog switch circuits, power amplifier circuits, and LoRa circuits; The low-voltage linear regulator circuit is used to provide operating voltage for the microphone circuit, the wireless audio transmission circuit, the analog switch circuit, and the power amplifier circuit. The audio signal output terminal of the microphone circuit is connected to the audio signal input terminal of the wireless audio transmission circuit. The signal output terminal of the analog switch circuit is connected to the control signal input terminal of the wireless audio transmission circuit, and is used to control the switching of the audio signal channel inside the wireless audio transmission circuit. The audio signal input terminal of the power amplifier circuit is connected to the audio signal output terminal of the wireless audio transmission circuit. The LoRa circuit is communicatively connected to the control interface of the wireless audio transmission circuit, and is used to receive remote control commands or send device status information via the LoRa wireless communication protocol.

2. A handset according to claim 1, wherein The low-voltage linear regulator circuit includes a low-voltage linear regulator, a power output terminal, a first capacitor, a second capacitor, a third capacitor, a first resistor, and a first inductor. The first terminal of the third capacitor is connected to the power input terminal and the IN terminal of the low-voltage linear regulator. The EN terminal of the low-voltage linear regulator is connected to the first terminal of the first resistor. The OUT terminal of the low-voltage linear regulator is connected to the first terminal of the first inductor and the first terminal of the second capacitor. The second terminal of the first capacitor is connected to the power output terminal and the first terminal of the first capacitor. The second terminals of the first capacitor, the second terminal of the second capacitor, and the second terminal of the third capacitor are all grounded.

3. A handset according to claim 2, wherein The microphone circuit includes a microphone, a third inductor, a fourth inductor, and a seventh resistor. The first end of the seventh resistor is connected to the first end of the third inductor and the microphone, respectively. The second end of the seventh resistor is connected to the first end of the fourth inductor and then grounded.

4. A handset according to claim 3, wherein The wireless audio transmission circuit includes a wireless audio transmission chip, a first tantalum capacitor, an eighteenth capacitor, and a fourth resistor. The CS terminal of the wireless audio transmission chip is connected in series with the fourth resistor and then connected to the power output terminal. The +3.3V terminal of the wireless audio transmission chip is connected to the first terminal of the eighteenth capacitor, the first terminal of the first tantalum capacitor, and the power output terminal, respectively. The MIC_P_IN terminal of the wireless audio transmission chip is connected to the second terminal of the third inductor, and the MIC_N_IN terminal of the wireless audio transmission chip is connected to the second terminal of the fourth inductor.

5. A handset according to claim 4, wherein The analog switch circuit includes an analog switch chip. The VCC terminal of the analog switch chip is connected to the power output terminal, the S1B terminal of the analog switch chip is connected to the RXD terminal of the wireless audio transmission chip, and the S1C terminal of the analog switch chip is connected to the TXD terminal of the wireless audio transmission chip.

6. A handheld transceiver according to claim 5, characterized in that, The power amplifier circuit includes an amplifier chip, a sixth resistor, a seventh resistor, an eighth resistor, a tenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a fuse, a power amplifier interface, and a power amplifier switch. The SHDN terminal of the amplifier chip is connected to the first terminal of the tenth capacitor, the first terminal of the sixth resistor, and the power amplifier switch, respectively. The second terminals of the sixth resistor and the tenth capacitor are both grounded. The IN+ terminal of the amplifier chip is connected to the seventh resistor and the twenty-first capacitor in series and then grounded. The IN- terminal of the amplifier chip is connected to the LINE_OUT terminal of the wireless audio transmission chip in series with the eighth resistor and the twenty-second capacitor. The VDD terminal of the amplifier chip is connected to the power output terminal in series with the fuse.

7. A handheld transceiver according to claim 6, characterized in that, The LoRa circuit includes a bidirectional diode, an eighth capacitor, a ninth capacitor, a second inductor, and an antenna. The first end of the bidirectional diode is connected to the first end of the ninth capacitor, the first end of the second inductor, and the ANT terminal of the wireless audio transmission chip. The second end of the second inductor is connected to the antenna and the first end of the eighth capacitor. The second ends of the eighth capacitor, the ninth capacitor, and the bidirectional diode are all grounded.

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