Audio board for switching very high frequency ground platform equipment

Abstract

The utility model discloses an audio board for switching very high frequency ground station equipment, which is characterized in that an audio receiving module receives signals of different audio equipment and provides original data for subsequent processing, and then the received audio signals are converted into conditioning audio signals through a signal conversion module; then the conditioned audio signal is sent to the audio coding and decoding module, the audio coding and decoding module is responsible for identifying the signal and generating an identification voltage, the type of the audio is determined through a circuit and a chip of the audio coding and decoding module, and the audio is automatically switched to a corresponding audio port through the audio switching module. According to the utility model, the automation level of very high frequency ground platform equipment is improved, and the complexity of operation is reduced. The gain value can be automatically adjusted, and firmware does not need to be upgraded according to the type of the accessed audio equipment, so that simple and flexible audio equipment access is realized, and the compatibility and flexibility of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of VHF ground station technology, specifically to an audio board for switching VHF ground station equipment. Background Technology

[0002] A VHF ground station is a type of ground-based navigation beacon station equipped with a digital board for digital signal processing. This digital board receives intermediate frequency (IF) signals from the radio frequency (RF) front-end and outputs audio signals in voice mode, thus completing the signal switching from IF to audio to achieve communication functions.

[0003] The audio board used in conjunction with VHF terrestrial stations serves as an audio signal router. It routes the input audio data to the output ports according to the corresponding interface driver requirements based on the radio's transmit / receive status. The audio ports include: a standard E&M voice port, a transmit / receive voice recording port, a panel speaker port, and a panel microphone port.

[0004] Currently, audio switching for VHF terrestrial station equipment relies primarily on manual judgment, and the testing tools are numerous and complex, failing to meet the simplification requirements of VHF terrestrial station equipment. Therefore, it is necessary to design an audio board for switching VHF terrestrial station equipment, which can identify audio signals and automatically switch them. Utility Model Content

[0005] In view of the problems mentioned above in the background technology, the purpose of this utility model is to provide an audio board for switching VHF terrestrial station equipment, which solves the problem that the current audio switching of VHF terrestrial station equipment mainly relies on manual judgment, and the detection tools are numerous and complex, which does not meet the requirements of simplifying VHF terrestrial station equipment.

[0006] This utility model is achieved through the following technical solution:

[0007] An audio board for switching VHF terrestrial station equipment includes:

[0008] An audio receiving module is used to receive audio signals from VHF terrestrial equipment;

[0009] A signal conversion module is used to convert the audio signal into a conditioned audio signal;

[0010] A signal biasing module is used to provide a bias voltage for the signal conversion module;

[0011] An audio codec module is used to identify the conditioned audio signal and generate an identification voltage;

[0012] An audio switching module is used to switch audio based on the identified voltage.

[0013] In the above technical solution, the audio receiving module receives signals from different audio devices, providing raw data for subsequent processing. The received audio signals are then converted into conditioned audio signals by a signal conversion module. Simultaneously, a signal bias module provides the necessary bias voltage to the signal conversion module, ensuring the signal has the correct operating voltage and bias resistance during conversion. The conditioned audio signal is then sent to the audio codec module, which identifies the signal and generates an identification voltage. The audio codec module's circuitry and chips determine the audio type, and the audio switching module automatically switches the audio to the corresponding audio port. The audio board's circuit structure completes audio identification and switching, reducing the need for manual judgment, minimizing requirements on detection equipment, improving the automation level of the VHF ground station equipment, and reducing operational complexity. Because it can automatically adjust the gain value, there is no need to upgrade the firmware based on the type of connected audio device, achieving simple and flexible audio device access and improving system compatibility and flexibility.

[0014] In one optional embodiment, the audio receiving module includes: chip U1, resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, audio input element B, switch S1, and switch S2.

[0015] In this configuration, pin 1 of chip U1 is connected to capacitor C1, both ends of audio input element B are connected to capacitor C1 and pin 2 of chip U1 respectively, pin 2 of chip U1 is also connected to switch S1, switch S2 is connected to pin 6 of chip U1, both ends of capacitor C3 are connected to pins 4 and 11 of chip U1 respectively, capacitor C4 is connected to pin 10 of chip U1, resistor R3 is connected to pins 13 and 14 of chip U1 respectively, resistors R1 and R2 are connected in series and then in parallel to capacitor C1 and pin 13 of chip U1, and capacitor C2 is connected at the midpoint between resistors R1 and R2.

[0016] In one alternative embodiment, the chip U1 is an ISD1820 chip.

[0017] In one optional embodiment, pin 1 of chip U1 is the MIC1 port, pin 2 of chip U1 is the MIC2 port, pin 6 of chip U1 is the PLAYE port, pin 10 of chip U1 is the AGC port, pin 4 of chip U1 is the SP+ port, pin 11 of chip U1 is the SP- port, and pin 14 of chip U1 is the VCC port.

[0018] In one optional embodiment, the signal conversion module includes: capacitor C5, capacitor C6, capacitor C8, capacitor C9, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8 and amplifier U2;

[0019] In this configuration, capacitor C5 and resistor R4 are connected in series to the negative input terminal of amplifier U2; resistors R5 and R7 are connected in series to the positive input terminal of amplifier U2; capacitor C6 is connected in parallel across resistor R7; resistor R6 is connected at the midpoint between capacitor C5 and resistor R4; capacitor C8 is connected to the control terminal of amplifier U2; resistor R8 is connected in parallel between the output terminal and the negative input terminal of amplifier U2; and capacitor C9 is connected in parallel across resistor R8.

[0020] In one alternative embodiment, the capacitor C5 is connected to the switch S2.

[0021] In one alternative embodiment, the signal biasing module includes a switch S3, one end of which is used to connect to the VCC power supply, and the other end is used to receive an enable signal.

[0022] In one optional embodiment, the audio codec module includes chip U3, resistors R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, and R22, capacitors C7, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, and C21, and inductors L1 and L2.

[0023] Specifically, pins 1 and 2 of chip U3 are connected to capacitor C7; capacitor C10 and resistor R10 are connected in parallel to pin 3 of chip U3; capacitor C11 and resistor R11 are connected in parallel to pin 5 of chip U3; pin 4 of chip U3 is connected to resistor R9; resistor R13 is connected to resistor R10; resistor R12 is connected to resistor R11; resistor R14 and capacitor C13 are connected in parallel to pin 6 of chip U3; inductor L1 and capacitor C12 are connected in parallel to pin 7 of chip U3; pin 9 of chip U3 is connected to resistor R15; resistor R16 and capacitor C16 are connected in parallel to pin 10 of chip U3; and resistor R1... 7 is connected in parallel with capacitor C15 and then connected to pin 11 of chip U3. Resistor R18 is connected to pin 13 of chip U3. Resistor R19 is connected in parallel with capacitor C14 and then connected to pin 24 of chip U3. Capacitor C17 is connected in parallel with inductor L2 and then connected to pin 14 of chip U3. Resistor R21 and capacitor C18 are connected in parallel and then connected to pin 15 of chip U3. Resistor R20 and capacitor C19 are connected in parallel and then connected to pin 16 of chip U3. Pin 17 of chip U3 is connected to capacitor C21. Pin 18 of chip U3 is connected to capacitor C20. Pin 19 of chip U3 is connected to capacitor C22. Pin 20 of chip U3 is connected to resistor R22.

[0024] In one alternative embodiment, the chip U3 is a GX2601 model chip.

[0025] In one optional embodiment, pin 1 of chip U3 is the MICIN port, pin 2 of chip U3 is the LINEIN port, pin 3 of chip U3 is the MCLK port, pin 4 of chip U3 is the CS_N port, pin 5 of chip U3 is the BCLK port, pin 6 of chip U3 is the DVDD port, pin 7 of chip U3 is the AVDD port, pin 9 of chip U3 is the AGDN port, and pin 10 of chip U3 is the DIN port. Pin 11 of chip U3 is the LRC port, pin 13 of chip U3 is the SCLK port, pin 24 of chip U3 is the DOUT port, pin 14 of chip U3 is a port, pin 15 of chip U3 is the SPKOUT port, pin 16 of chip U3 is the HPOUT port, pin 17 of chip U3 is the XDCS port, pin 18 of chip U3 is the XRST_N port, pin 19 of chip U3 is the SCL port, and pin 20 of chip U3 is the SDA port.

[0026] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0027] The audio board's circuit structure enables audio recognition and switching, reducing the need for manual judgment, minimizing requirements on testing equipment, improving the automation level of VHF terrestrial equipment, and lowering operational complexity. Because it can automatically adjust gain values, there's no need to upgrade firmware based on the type of connected audio device, enabling simple and flexible audio device access and improving system compatibility and flexibility. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 A schematic diagram of the structure of an audio board for switching VHF terrestrial station equipment provided in Embodiment 1 of this utility model;

[0030] Figure 2 A schematic diagram of the principle of the audio receiving module provided in Embodiment 1 of this utility model;

[0031] Figure 3 A schematic diagram of the signal conversion module provided in Embodiment 1 of this utility model;

[0032] Figure 4 This is a schematic diagram of the audio encoding / decoding module provided in Embodiment 1 of this utility model. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings in an optional embodiment. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0034] Example 1

[0035] This embodiment 1 provides an audio board for switching VHF terrestrial station equipment, such as... Figure 1 As shown, an audio board for switching VHF terrestrial station equipment includes:

[0036] An audio receiving module is used to receive audio signals from VHF terrestrial equipment;

[0037] A signal conversion module is used to convert the audio signal into a conditioned audio signal;

[0038] A signal biasing module is used to provide a bias voltage for the signal conversion module;

[0039] An audio codec module is used to identify the conditioned audio signal and generate an identification voltage;

[0040] An audio switching module is used to switch audio based on the identified voltage.

[0041] It should be noted that the audio receiving module receives signals from different audio devices, providing raw data for subsequent processing. The received audio signals are then converted into conditioned audio signals by a signal conversion module. Simultaneously, a signal bias module provides the necessary bias voltage to the signal conversion module, ensuring the correct operating voltage and bias resistance during conversion. The conditioned audio signal is then sent to the audio codec module, which identifies the signal and generates an identification voltage. The audio codec module's circuitry and chips determine the audio type, and the audio switching module automatically switches the audio to the corresponding audio port. The audio board's circuit structure completes audio identification and switching, reducing the need for manual judgment, minimizing requirements on detection equipment, improving the automation level of the VHF terrestrial station equipment, and reducing operational complexity. Because it can automatically adjust the gain value, there is no need to upgrade firmware based on the type of connected audio device, enabling simple and flexible audio device access and improving system compatibility and flexibility.

[0042] In one optional embodiment, the audio receiving module includes: chip U1, resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, audio input element B, switch S1, and switch S2.

[0043] In this configuration, pin 1 of chip U1 is connected to capacitor C1, both ends of audio input element B are connected to capacitor C1 and pin 2 of chip U1 respectively, pin 2 of chip U1 is also connected to switch S1, switch S2 is connected to pin 6 of chip U1, both ends of capacitor C3 are connected to pins 4 and 11 of chip U1 respectively, capacitor C4 is connected to pin 10 of chip U1, resistor R3 is connected to pins 13 and 14 of chip U1 respectively, resistors R1 and R2 are connected in series and then in parallel to capacitor C1 and pin 13 of chip U1, and capacitor C2 is connected at the midpoint between resistors R1 and R2.

[0044] In one alternative embodiment, the chip U1 is an ISD1820 chip.

[0045] In one optional embodiment, pin 1 of chip U1 is the MIC1 port, pin 2 of chip U1 is the MIC2 port, pin 6 of chip U1 is the PLAYE port, pin 10 of chip U1 is the AGC port, pin 4 of chip U1 is the SP+ port, pin 11 of chip U1 is the SP- port, and pin 14 of chip U1 is the VCC port.

[0046] like Figure 2 As shown, the ISD1820 chip can be used to implement audio reception. It connects with other electrical components in the audio receiving module to achieve audio reception functionality for VHF terrestrial equipment. When switch S1 is closed, audio reception occurs, and the received audio is transmitted to chip U1; when switch S2 is closed, the audio signal is transmitted from chip U1 to the signal conversion module.

[0047] In one optional embodiment, the signal conversion module includes: capacitor C5, capacitor C6, capacitor C8, capacitor C9, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8 and amplifier U2;

[0048] In this configuration, capacitor C5 and resistor R4 are connected in series to the negative input terminal of amplifier U2; resistors R5 and R7 are connected in series to the positive input terminal of amplifier U2; capacitor C6 is connected in parallel across resistor R7; resistor R6 is connected at the midpoint between capacitor C5 and resistor R4; capacitor C8 is connected to the control terminal of amplifier U2; resistor R8 is connected in parallel between the output terminal and the negative input terminal of amplifier U2; and capacitor C9 is connected in parallel across resistor R8.

[0049] In one alternative embodiment, the capacitor C5 is connected to the switch S2.

[0050] In one alternative embodiment, the signal biasing module includes a switch S3, one end of which is used to connect to the VCC power supply, and the other end is used to receive an enable signal.

[0051] like Figure 3As shown, capacitor C5 and resistor R4 are connected in series to couple the input signal, blocking the DC component while allowing the AC signal to pass through, and are connected to the negative input terminal of amplifier U2. Resistor R4 and capacitor C5 together form a high-pass filter, setting the low-frequency response of the signal conversion module. Resistor R7 and resistor R5 together form a voltage divider, providing a bias voltage to the positive input terminal of amplifier U2. Capacitor C6 is connected in parallel across resistor R7 to AC couple the positive input terminal of amplifier U2, further removing the DC bias. Amplifier U2, as the core of the signal conversion module, is responsible for amplifying the input audio signal and providing the required gain and frequency response. The signal conversion module outputs a conditioned audio signal through filtering and amplification.

[0052] In one optional embodiment, the audio codec module includes chip U3, resistors R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, and R22, capacitors C7, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, and C21, and inductors L1 and L2.

[0053] Specifically, pins 1 and 2 of chip U3 are connected to capacitor C7; capacitor C10 and resistor R10 are connected in parallel to pin 3 of chip U3; capacitor C11 and resistor R11 are connected in parallel to pin 5 of chip U3; pin 4 of chip U3 is connected to resistor R9; resistor R13 is connected to resistor R10; resistor R12 is connected to resistor R11; resistor R14 and capacitor C13 are connected in parallel to pin 6 of chip U3; inductor L1 and capacitor C12 are connected in parallel to pin 7 of chip U3; pin 9 of chip U3 is connected to resistor R15; resistor R16 and capacitor C16 are connected in parallel to pin 10 of chip U3; and resistor R1... 7 is connected in parallel with capacitor C15 and then connected to pin 11 of chip U3. Resistor R18 is connected to pin 13 of chip U3. Resistor R19 is connected in parallel with capacitor C14 and then connected to pin 24 of chip U3. Capacitor C17 is connected in parallel with inductor L2 and then connected to pin 14 of chip U3. Resistor R21 and capacitor C18 are connected in parallel and then connected to pin 15 of chip U3. Resistor R20 and capacitor C19 are connected in parallel and then connected to pin 16 of chip U3. Pin 17 of chip U3 is connected to capacitor C21. Pin 18 of chip U3 is connected to capacitor C20. Pin 19 of chip U3 is connected to capacitor C22. Pin 20 of chip U3 is connected to resistor R22.

[0054] In one alternative embodiment, the chip U3 is a GX2601 model chip.

[0055] In one optional embodiment, pin 1 of chip U3 is the MICIN port, pin 2 of chip U3 is the LINEIN port, pin 3 of chip U3 is the MCLK port, pin 4 of chip U3 is the CS_N port, pin 5 of chip U3 is the BCLK port, pin 6 of chip U3 is the DVDD port, pin 7 of chip U3 is the AVDD port, pin 9 of chip U3 is the AGDN port, and pin 10 of chip U3 is the DIN port. Pin 11 of chip U3 is the LRC port, pin 13 of chip U3 is the SCLK port, pin 24 of chip U3 is the DOUT port, pin 14 of chip U3 is a port, pin 15 of chip U3 is the SPKOUT port, pin 16 of chip U3 is the HPOUT port, pin 17 of chip U3 is the XDCS port, pin 18 of chip U3 is the XRST_N port, pin 19 of chip U3 is the SCL port, and pin 20 of chip U3 is the SDA port.

[0056] like Figure 4 As shown, chip U3 is the core of the audio codec module, responsible for processing the encoding and decoding of audio signals. In this embodiment, the GX2601 chip is used, a low-power audio codec that includes a single-channel ADC, a single-channel DAC, a low-noise preamplifier, a headphone driver, digital sound effects, analog mixing, and gain functions, offering advantages such as high performance, low power consumption, and low cost. In this embodiment, it is used to encode and decode the conditioned audio signal, detect and identify the type of audio port, output a voltage signal, and switch the audio port based on the voltage signal through an audio switching module.

[0057] In this embodiment, the audio switching module is implemented by connecting a diode and an eight-channel data selector in series.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An audio board for switching VHF terrestrial station equipment, characterized in that, include: An audio receiving module is used to receive audio signals from VHF terrestrial equipment; A signal conversion module is used to convert the audio signal into a conditioned audio signal; A signal biasing module is used to provide a bias voltage for the signal conversion module; An audio codec module is used to identify the conditioned audio signal and generate an identification voltage; An audio switching module is used to switch audio based on the identified voltage.

2. An audio board for switching VHF terrestrial station equipment according to claim 1, characterized in that, The audio receiving module includes: chip U1, resistors R1, R2, and R3, capacitors C1, C2, C3, and C4, audio input element B, switch S1, and switch S2. In this configuration, pin 1 of chip U1 is connected to capacitor C1, both ends of audio input element B are connected to capacitor C1 and pin 2 of chip U1 respectively, pin 2 of chip U1 is also connected to switch S1, switch S2 is connected to pin 6 of chip U1, both ends of capacitor C3 are connected to pins 4 and 11 of chip U1 respectively, capacitor C4 is connected to pin 10 of chip U1, resistor R3 is connected to pins 13 and 14 of chip U1 respectively, resistors R1 and R2 are connected in series and then in parallel to capacitor C1 and pin 13 of chip U1, and capacitor C2 is connected at the midpoint between resistors R1 and R2.

3. An audio board for switching VHF terrestrial station equipment according to claim 2, characterized in that, The chip U1 is an ISD1820 chip.

4. An audio board for switching VHF terrestrial station equipment according to claim 3, characterized in that, Pin 1 of chip U1 is the MIC1 port, pin 2 of chip U1 is the MIC2 port, pin 6 of chip U1 is the PLAYE port, pin 10 of chip U1 is the AGC port, pin 4 of chip U1 is the SP+ port, pin 11 of chip U1 is the SP- port, and pin 14 of chip U1 is the VCC port.

5. An audio board for switching VHF terrestrial station equipment according to claim 2, characterized in that, The signal conversion module includes: capacitors C5, C6, C8, and C9; resistors R4, R5, R6, R7, and R8; and amplifier U2. In this configuration, capacitor C5 and resistor R4 are connected in series to the negative input terminal of amplifier U2; resistors R5 and R7 are connected in series to the positive input terminal of amplifier U2; capacitor C6 is connected in parallel across resistor R7; resistor R6 is connected at the midpoint between capacitor C5 and resistor R4; capacitor C8 is connected to the control terminal of amplifier U2; resistor R8 is connected in parallel between the output terminal and the negative input terminal of amplifier U2; and capacitor C9 is connected in parallel across resistor R8.

6. An audio board for switching VHF terrestrial station equipment according to claim 5, characterized in that, The capacitor C5 is connected to the switch S2.

7. An audio board for switching VHF terrestrial station equipment according to claim 5, characterized in that, The signal biasing module includes a switch S3, one end of which is used to connect to the VCC power supply, and the other end is used to receive an enable signal.

8. An audio board for switching VHF terrestrial station equipment according to claim 5, characterized in that, The audio codec module includes chip U3, resistors R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, and R22, capacitors C7, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, and C21, and inductors L1 and L2. Specifically, pins 1 and 2 of chip U3 are connected to capacitor C7; capacitor C10 and resistor R10 are connected in parallel to pin 3 of chip U3; capacitor C11 and resistor R11 are connected in parallel to pin 5 of chip U3; pin 4 of chip U3 is connected to resistor R9; resistor R13 is connected to resistor R10; resistor R12 is connected to resistor R11; resistor R14 and capacitor C13 are connected in parallel to pin 6 of chip U3; inductor L1 and capacitor C12 are connected in parallel to pin 7 of chip U3; pin 9 of chip U3 is connected to resistor R15; resistor R16 and capacitor C16 are connected in parallel to pin 10 of chip U3; and resistor R1... 7 is connected in parallel with capacitor C15 and then connected to pin 11 of chip U3. Resistor R18 is connected to pin 13 of chip U3. Resistor R19 is connected in parallel with capacitor C14 and then connected to pin 24 of chip U3. Capacitor C17 is connected in parallel with inductor L2 and then connected to pin 14 of chip U3. Resistor R21 and capacitor C18 are connected in parallel and then connected to pin 15 of chip U3. Resistor R20 and capacitor C19 are connected in parallel and then connected to pin 16 of chip U3. Pin 17 of chip U3 is connected to capacitor C21. Pin 18 of chip U3 is connected to capacitor C20. Pin 19 of chip U3 is connected to capacitor C22. Pin 20 of chip U3 is connected to resistor R22.

9. An audio board for switching VHF terrestrial station equipment according to claim 8, characterized in that, The chip U3 is a GX2601 model chip.

10. An audio board for switching VHF terrestrial station equipment according to claim 9, characterized in that, Pin 1 of chip U3 is the MICIN port; pin 2 of chip U3 is the LINEIN port; pin 3 of chip U3 is the MCLK port; pin 4 of chip U3 is the CS_N port; pin 5 of chip U3 is the BCLK port; pin 6 of chip U3 is the DVDD port; pin 7 of chip U3 is the AVDD port; pin 9 of chip U3 is the AGDN port; pin 10 of chip U3 is the DIN port; pin 11 of chip U3 is the LRC port; pin 13 of chip U3 is the SCLK port; pin 24 of chip U3 is the DOUT port; pin 14 of chip U3 is a port; pin 15 of chip U3 is the SPKOUT port; pin 16 of chip U3 is the HPOUT port; pin 17 of chip U3 is the XDCS port; pin 18 of chip U3 is the XRST_N port; pin 19 of chip U3 is the SCL port; and pin 20 of chip U3 is the SDA port.

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