Newspaper and voice input switching device

Abstract

The utility model provides a newspaper and voice input switching device which comprises a shell, a USB interface, a USB-to-serial port, an MCU control circuit, a key interface, a switching button, a newspaper volume controller, a voice input interface, a voice power amplifier, an audio switching circuit, an audio amplifying circuit and an audio output interface. According to the utility model, a radio signal input channel and a voice signal input channel are integrated in a single device, so that a user can use a radio mode to obtain high-recognition-degree code input in a strong interference or long-distance scene, and the radio mode is switched to a voice call mode in a conventional environment, so that the size and the use cost of the device are remarkably reduced; according to the utility model, the USB interface is adopted to provide power supply and data connection, external wiring is simplified, and flexible switching and high-quality output of telegraph and voice signals are realized through cooperation of the analog switch and gain adjustment; the device is compact in structure, complete in function and convenient to apply in multiple scenes.

Description

Technical Field

[0001] This utility model belongs to the field of communication technology, specifically relating to a telegraph and voice input switching device. Background Technology

[0002] With the continuous development of radio communication technology, telegraph (such as Morse code) and voice communication, as common information transmission methods, have their own advantages and applicable scenarios in different application fields. Telegraph communication can maintain a high recognition rate even in long-distance, low-bandwidth environments and under strong interference conditions, making it particularly suitable for emergency rescue, emergency communications, and military applications; while voice communication, due to its intuitiveness, ease of understanding, and simple operation, has become the mainstream communication method widely used today.

[0003] In everyday and professional communication equipment, some scenarios require simultaneous support for both telegraph and voice input modes. However, existing devices often only support a single mode or necessitate replacing different devices to achieve this. For example, telegraph key interfaces are typically combined with traditional Morse trainers or transceivers, while voice microphone interfaces are combined with common communication devices or walkie-talkies. These two types of interfaces differ significantly in hardware design and signal processing. Switching between them requires modifications to the existing hardware circuitry or the use of additional converters. This approach is not only cumbersome but also increases the size and cost of the equipment. Summary of the Invention

[0004] This utility model proposes a device for switching between radio and voice input, which solves the problem in the prior art that it is difficult to flexibly switch between radio and voice modes on the same device, requiring multiple devices or cumbersome operations.

[0005] To achieve the objectives of this utility model, the proposed solution is as follows:

[0006] A radio and voice input switching device includes a housing, a USB interface, a USB-to-serial port circuit, an MCU control circuit, a key interface, a switching button, a radio volume control circuit, a voice input interface, a voice power amplifier circuit, an audio switching circuit, an audio amplifier circuit, and an audio output interface.

[0007] The outer panel of the housing is equipped with a USB interface, a key interface, a switch button, a voice input interface, and an audio output interface;

[0008] The USB to serial port circuit, MCU control circuit, message volume control circuit, voice power amplifier circuit, audio switching circuit, and audio amplifier circuit are located inside the housing.

[0009] The signal line of the USB interface is connected to the input terminal of the USB-to-serial circuit, and the output terminal of the USB-to-serial circuit is electrically connected to the serial communication port of the MCU control circuit.

[0010] The key interface is electrically connected to the input terminal of the MCU control circuit, and the switch button is electrically connected to the other input terminal of the MCU control circuit.

[0011] The radio volume control circuit is electrically connected to the output terminal of the MCU control circuit and to the first input terminal of the audio switching circuit.

[0012] The voice input interface is electrically connected to the input terminal of the voice power amplifier circuit, and the output terminal of the voice power amplifier circuit is electrically connected to the second input terminal of the audio switching circuit.

[0013] The output terminal of the audio switching circuit is electrically connected to the input terminal of the audio amplifier circuit, and the output terminal of the audio amplifier circuit is electrically connected to the audio output interface.

[0014] Furthermore, the USB to serial port circuit includes a CH340N integrated circuit and several discrete components. The D+ and D- terminals of the CH340N integrated circuit are respectively connected to the signal terminals of the USB interface. The TXD and RXD terminals of the CH340N integrated circuit are respectively connected to the RX and TX terminals of the MCU control circuit. The power supply pin of the CH340N integrated circuit is connected to the power supply line inside the housing through a decoupling capacitor.

[0015] Furthermore, the MCU control circuit includes a microcontroller chip and a clock crystal circuit, a reset circuit, and several resistor-capacitor components connected to each pin of the microcontroller chip. The key interface is connected to the digital input pin of the microcontroller chip through at least one resistor, the switch button is connected to the digital input pin of the microcontroller chip through another resistor, and the service volume control circuit is connected to the audio switching circuit through the analog or digital output pin of the microcontroller chip.

[0016] Furthermore, the voice power amplifier circuit includes an SSM2167 integrated circuit. The input terminal of the SSM2167 integrated circuit is connected to the voice input interface, and the output terminal is connected to the second input terminal of the audio switching circuit. The power supply pin of the SSM2167 integrated circuit is connected to the power supply line inside the housing and grounded through a bypass capacitor. The gain adjustment terminal of the SSM2167 integrated circuit is connected to the ground line through an external resistor or capacitor.

[0017] Furthermore, the audio switching circuit includes an SGM3005 multiplex analog switch. The control terminal of the SGM3005 multiplex analog switch is connected to the output terminal of the MCU control circuit. Different signal terminals of the SGM3005 multiplex analog switch are respectively connected to the output terminals of the radio volume control circuit and the voice power amplifier circuit, and the corresponding output signals are transferred to the input terminal of the audio amplifier circuit.

[0018] Furthermore, the audio amplification circuit includes a TDA1308T integrated circuit. The left and right channel input terminals of the TDA1308T integrated circuit are respectively connected to the output terminals of the audio switching circuit through coupling capacitors. The left and right channel output terminals of the TDA1308T integrated circuit are respectively connected to the audio output interface through matching resistors. The power supply pin of the TDA1308T integrated circuit is connected to the power supply line inside the housing through a voltage regulator circuit and grounded through a decoupling capacitor.

[0019] Furthermore, the voltage regulator circuit includes an AMS1117 low dropout linear regulator. The input terminal of the AMS1117 low dropout linear regulator is connected to the 5V power line provided by the USB interface, and the output terminal is connected to the power supply terminal of the MCU control circuit and the USB to serial port circuit through a decoupling capacitor.

[0020] Furthermore, a power filtering circuit is provided between the USB interface and the USB-to-serial port circuit. The power filtering circuit consists of at least one inductor and several capacitors. The inductor is connected in series with the USB 5V power line, and each capacitor is connected in parallel with the ground line to suppress high-frequency noise.

[0021] Furthermore, the housing is provided with an indicator light circuit, which includes an LED connected to the output of the MCU control circuit and a current-limiting resistor. The LED is mounted on the outer panel of the housing and is used to indicate the working status of the radio and voice input switching device.

[0022] Furthermore, the audio output interface is a TRS or TRRS socket, and the signal terminal of the audio output interface is connected to the left and right channel output terminals of the audio amplifier circuit through matching resistors and coupling capacitors, while the ground terminal is connected to the common ground wire inside the housing.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This invention integrates both radio and voice input modes within a single device, simplifying switching between multiple devices or interfaces and avoiding inconvenience and increased size and cost caused by device switching. Through reasonable circuit layout and component selection, it achieves functional integration while maintaining good electromagnetic compatibility, especially in scenarios with strong interference or long-distance communication, where radio mode maintains high recognition accuracy. In normal environments, it can switch to voice mode to meet daily call needs. Power and data connections are provided via a USB port, conforming to the common interface standards of existing communication equipment, reducing the risk of unstable external power supply or connection errors, and improving system compatibility and stability. Furthermore, the combination of the audio switching circuit and the MCU control circuit employs a simple and reliable logic control method, reducing the complexity of hardware circuitry and control processes, shortening system response time, and providing flexible space for subsequent functional expansion or maintenance upgrades. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the housing of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the circuit operation of an embodiment of the present invention.

[0027] Figure 3 This is a circuit diagram of the USB interface according to an embodiment of the present invention;

[0028] Figure 4 This is a circuit diagram of a USB to serial port according to an embodiment of this utility model;

[0029] Figure 5 This is a circuit diagram of the key interface in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the MCU control circuit of an embodiment of the present invention;

[0031] Figure 7 This is a circuit diagram of the switching button according to an embodiment of the present invention;

[0032] Figure 8 This is a circuit diagram of the radio volume control according to an embodiment of the present invention;

[0033] Figure 9 This is a circuit diagram of the voice input interface according to an embodiment of the present invention;

[0034] Figure 10 is a schematic diagram of the voice power amplifier circuit of an embodiment of the present invention, wherein Figure 10(a) is a schematic diagram of the left channel power amplifier circuit and Figure 10(b) is a schematic diagram of the right channel power amplifier circuit.

[0035] Figure 11 This is an audio switching circuit diagram of an embodiment of the present invention;

[0036] Figure 12 This is a circuit diagram of an audio amplifier according to an embodiment of the present invention;

[0037] Figure 13 This is a circuit diagram of the audio output interface of an embodiment of the present invention.

[0038] In the diagram, 1-shell; 2-USB interface; 3-USB to serial port circuit; 4-MCU control circuit; 5-key interface; 6-switch button; 7-report volume control circuit; 8-voice input interface; 9-voice power amplifier circuit; 10-audio switching circuit; 11-audio amplifier circuit; 12-audio output interface. Detailed Implementation

[0039] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Example:

[0043] The following is in conjunction with the appendix Figure 1 To be continued Figure 13 The embodiments of this utility model will be described in detail below.

[0044] like Figure 1As shown, the telegraph and voice input switching device in this embodiment includes a housing 1, a USB interface 2, a USB-to-serial circuit 3, an MCU control circuit 4, a key interface 5, a switching button 6, a telegraph volume control circuit 7, a voice input interface 8, a voice power amplifier circuit 9, an audio switching circuit 10, an audio amplifier circuit 11, and an audio output interface 12. The external panel of the housing 1 is equipped with the USB interface 2, key interface 5, switching button 6, voice input interface 8, and audio output interface 12 for convenient plugging and unplugging of cables or components by the user.

[0045] like Figure 2 As shown, the overall working principle of this device can be divided into three main parts: signal input, signal conversion and processing, and signal output. USB interface 2 provides power and data connection for this device. Its signal lines are converted by USB-to-serial circuit 3 and then connected to MCU control circuit 4, thereby enabling communication and power supply with a host computer or other USB host devices. Key interface 5 is electrically connected to the input terminal of MCU control circuit 4. When the user connects the key and triggers the Morse code transmission, MCU control circuit 4 can recognize and generate the corresponding message signal. Switch button 6 is electrically connected to another input terminal of MCU control circuit 4 and is used to switch the device's working mode (message or voice).

[0046] In the telematics mode, such as Figure 7 and Figure 8 As shown, the status signal of the switch button 6 causes the MCU control circuit 4 to select and output a message-related control signal to the message volume control circuit 7. The message volume control circuit 7 further adjusts the amplitude of the message signal (e.g., through a variable resistor or digital gain) and inputs the adjusted signal to the first input terminal of the audio switching circuit 10. The audio switching circuit 10 can employ a multiplexer analog switch (see...). Figure 11 As shown), under the switching signal output by the MCU control circuit 4, the signal output by the radio volume control circuit 7 is routed to the audio amplifier circuit 11 to achieve the output of radio audio. The audio amplifier circuit 11 is based on integrated circuits such as the TDA1308T (see...). Figure 12 As shown), the amplified audio signal is finally output to audio output interface 12 (see...). Figure 13 (As shown) for users to listen or record.

[0047] In voice mode, such as Figure 9As shown in Figure 10, the voice input interface 8 is electrically connected to the voice power amplifier circuit 9. In a stereo design, the voice input interface 8 can simultaneously provide left and right channel signals, which are respectively input to the two amplification units of the voice power amplifier circuit 9 (e.g., using two SSM2167 integrated amplifiers, or using an amplifier chip with dual-channel functionality). Through the gain adjustment terminal and external resistor-capacitor components, each channel can amplify the input voice signal and achieve noise suppression. The amplified left and right channel signals are then fed into the second input terminal of the audio switching circuit 10. When the user presses the switch button 6 and switches the device to voice mode, the MCU control circuit 4 outputs a corresponding control signal, causing the audio switching circuit 10 to select the output of the voice power amplifier circuit 9 for subsequent amplification in the audio amplifier circuit 11. Finally, the left and right channel voice signals are output through the audio output interface 12, thereby achieving a clear and stable dual-channel voice communication effect.

[0048] like Figure 3 and Figure 4 As shown, a power supply filter circuit can also be set between the USB interface 2 and the USB-to-serial circuit 3 to suppress high-frequency noise by connecting at least one inductor and several capacitors in series and parallel. The USB-to-serial circuit 3 can use a general-purpose serial port conversion chip such as CH340N. Its D+ and D- terminals are connected to the corresponding signal terminals of the USB interface 2, while the TXD and RXD terminals are electrically connected to the serial port RX and TX pins of the MCU control circuit 4, respectively. This approach ensures compatible conversion of USB data, simplifies the hardware layout, and facilitates the miniaturization and improved reliability of the overall device.

[0049] like Figure 5 As shown, the key interface 5 is mainly connected to the digital input pins of the MCU control circuit 4 via at least one resistor. When the user connects a traditional key and performs Morse code transmission, the MCU control circuit 4 can obtain the corresponding pulse input signal; such as... Figure 6 The MCU control circuit 4 shown includes a microcontroller chip and a clock crystal circuit, a reset circuit, and several resistor and capacitor components connected to its pins to ensure the timing stability and reliable operation of the microcontroller. Figure 7 The switch button 6 shown is connected to another digital input pin of the microcontroller. The microcontroller can switch between radio and voice modes by detecting the trigger signal of the switch button 6, thereby realizing multi-functional extended applications.

[0050] also, Figures 7 to 13 The circuit modules shown can be integrated in this invention using printed circuit board soldering or modular plug-in methods and installed inside the housing 1.

[0051] In other embodiments, to improve system stability and sound quality output, a voltage regulator circuit (such as a low dropout linear regulator like the AMS1117 shown in the figure) and an indicator circuit (such as installing LEDs and current-limiting resistors on the housing panel to indicate the operating status of the device) can be added inside the housing 1. Figure 2 The working principle diagram can summarize the electrical connections and signal flow between all functional modules, enabling those skilled in the art to clearly understand the hardware structure and signal processing flow of this device.

[0052] Through the above structural design, this utility model enables the selection and switching of telegraph and voice signals within the same device, simplifying the user operation process. Simultaneously, it maintains the reliability of the telegraph mode for scenarios requiring long-distance or high-interference environments, while providing voice mode support for routine daily voice communication. Compared to existing technologies, this device is more compact and has simpler wiring for equivalent functionality. Furthermore, it leverages the versatility of USB power supply and data communication, reducing the use of external adapters or redundant cables, thus improving overall ease of use and scalability.

[0053] This embodiment effectively integrates the message mode and voice mode without changing the mainstream interface standards of existing communication systems, meeting the needs of different usage environments. It retains the application value of message training or in special environments while also taking into account the convenience of voice communication. By simplifying the circuit structure and control flow, it reduces hardware costs and size, enhances the ease of use of the system, and has good compatibility with subsequent function upgrades or improvements.

[0054] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A device for switching between radio and voice input, characterized in that, It includes a housing (1), a USB interface (2), a USB to serial port circuit (3), an MCU control circuit (4), a key interface (5), a switching button (6), a radio volume control circuit (7), a voice input interface (8), a voice power amplifier circuit (9), an audio switching circuit (10), an audio amplifier circuit (11), and an audio output interface (12). The outer panel of the housing (1) is provided with a USB interface (2), a key interface (5), a switch button (6), a voice input interface (8) and an audio output interface (12); The USB to serial port circuit (3), MCU control circuit (4), message volume control circuit (7), voice power amplifier circuit (9), audio switching circuit (10) and audio amplifier circuit (11) are located inside the housing (1); The signal line of the USB interface (2) is connected to the input end of the USB to serial port circuit (3), and the output end of the USB to serial port circuit (3) is electrically connected to the serial communication port of the MCU control circuit (4). The key interface (5) is electrically connected to the input terminal of the MCU control circuit (4), and the switch button (6) is electrically connected to the other input terminal of the MCU control circuit (4); The radio volume control circuit (7) is electrically connected to the output terminal of the MCU control circuit (4) and electrically connected to the first input terminal of the audio switching circuit (10); The voice input interface (8) is electrically connected to the input terminal of the voice power amplifier circuit (9), and the output terminal of the voice power amplifier circuit (9) is electrically connected to the second input terminal of the audio switching circuit (10). The output terminal of the audio switching circuit (10) is electrically connected to the input terminal of the audio amplifier circuit (11), and the output terminal of the audio amplifier circuit (11) is electrically connected to the audio output interface (12).

2. The telegraph and voice input switching device according to claim 1, characterized in that, The USB to serial port circuit (3) includes a CH340N integrated circuit and several discrete components. The D+ and D- terminals of the CH340N integrated circuit are respectively connected to the signal terminals of the USB interface (2). The TXD and RXD terminals of the CH340N integrated circuit are respectively connected to the RX and TX terminals of the MCU control circuit (4). The power supply pins of the CH340N integrated circuit are connected to the power supply line inside the housing (1) through decoupling capacitors.

3. The telegraph and voice input switching device according to claim 1, characterized in that, The MCU control circuit (4) includes a microcontroller chip and a clock crystal circuit, a reset circuit and several resistor and capacitor components connected to each pin of the microcontroller chip. The key interface (5) is connected to the digital input pin of the microcontroller chip through at least one resistor. The switch button (6) is connected to the digital input pin of the microcontroller chip through another resistor. The service volume control circuit (7) is connected to the audio switching circuit (10) through the analog or digital output pin of the microcontroller chip.

4. The telegraph and voice input switching device according to claim 1, characterized in that, The voice power amplifier circuit (9) includes an SSM2167 integrated circuit. The input terminal of the SSM2167 integrated circuit is connected to the voice input interface (8), and the output terminal is connected to the second input terminal of the audio switching circuit (10). The power supply pin of the SSM2167 integrated circuit is connected to the power supply line inside the housing (1) and grounded through a bypass capacitor. The gain adjustment terminal of the SSM2167 integrated circuit is connected to the ground line through an external resistor or capacitor.

5. The telegraph and voice input switching device according to claim 1, characterized in that, The audio switching circuit (10) includes an SGM3005 multi-channel analog switch. The control terminal of the SGM3005 multi-channel analog switch is connected to the output terminal of the MCU control circuit (4). Different signal terminals of the SGM3005 multi-channel analog switch are respectively connected to the output terminals of the radio volume control circuit (7) and the voice power amplifier circuit (9), and the corresponding output signals are transferred to the input terminal of the audio amplifier circuit (11).

6. The telegraph and voice input switching device according to claim 1, characterized in that, The audio amplifier circuit (11) includes a TDA1308T integrated circuit. The left and right channel input terminals of the TDA1308T integrated circuit are respectively connected to the output terminals of the audio switching circuit (10) through coupling capacitors. The left and right channel output terminals of the TDA1308T integrated circuit are respectively connected to the audio output interface (12) through matching resistors. The power supply pin of the TDA1308T integrated circuit is connected to the power supply line inside the housing (1) through a voltage regulator circuit and grounded through a decoupling capacitor.

7. The telegraph and voice input switching device according to claim 6, characterized in that, The voltage regulator circuit includes an AMS1117 low dropout linear regulator. The input of the AMS1117 low dropout linear regulator is connected to the 5V power supply provided by the USB interface (2), and the output is connected to the power supply of the MCU control circuit (4) and the USB to serial port circuit (3) through a decoupling capacitor.

8. The telegraph and voice input switching device according to claim 1, characterized in that, A power filtering circuit is provided between the USB interface (2) and the USB to serial port circuit (3). The power filtering circuit consists of at least one inductor and several capacitors. The inductor is connected in series with the USB 5V power line, and each capacitor is connected in parallel with the ground line to suppress high-frequency noise.

9. The telegraph and voice input switching device according to claim 1, characterized in that, The housing (1) is provided with an indicator light circuit, which includes an LED connected to the output terminal of the MCU control circuit (4) and a current limiting resistor. The LED is installed on the external panel of the housing (1) to indicate the working status of the radio and voice input switching device.

10. The telegraph and voice input switching device according to claim 1, characterized in that, The audio output interface (12) is a TRS or TRRS socket. The signal terminal of the audio output interface (12) is connected to the left and right channel output terminals of the audio amplifier circuit (11) through matching resistors and coupling capacitors, and the ground terminal is connected to the common ground line inside the housing (1).

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