An on-board multi-channel high-performance audio processing sound card

Abstract

The utility model relates to audio frequency processing technical field, concretely relates to airborne multi -pass high performance audio frequency processing sound card, the sound card includes power conversion circuit, data processing circuit, audio frequency acquisition circuit and audio output circuit, data processing circuit and airborne control host computer, airborne wireless communication equipment respectively carry out the interaction, data processing circuit still is connected with audio frequency acquisition circuit and audio output circuit through ADDA chip, the input of audio frequency acquisition circuit is connected with the output of airborne earphone microphone group, the output of audio output circuit is connected with the input of airborne earphone microphone group, power conversion circuit, data processing circuit, audio frequency acquisition circuit and audio output circuit all set up in same board card, the sound card can support multi -pass number that the utility model puts forward, can carry out parallel processing to multichannel audio signal simultaneously, and can realize earphone group high real -time performance, low distortion, high signal -to -noise ratio audio playback.

Description

Technical Field

[0001] This utility model relates to the field of audio processing technology, specifically to an airborne multi-channel high-performance audio processing sound card. Background Technology

[0002] Traditional airborne communication equipment generally uses analog circuit design and relies on physical cables to complete signal transmission. However, it generally suffers from problems such as sensitivity to electromagnetic interference, excessive size and weight, and limited functionality. Although current digital audio technology is widely used in airborne equipment, it still has the following shortcomings:

[0003] 1) Insufficient multi-channel processing capability: For example, patent CN119052212A proposes a design to improve communication bandwidth in an airborne digital audio communication system and method, but it does not solve the problem of parallel processing and synchronization of multiple audio signals;

[0004] 2) Insufficient anti-interference capability: Traditional airborne sound cards are unable to suppress cabin noise exceeding 100dB. Although patent CN216490833U reduces interference through MCU decoding and self-identification technology, its design is not optimized for strong interference airborne noise environment. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide an airborne multi-channel high-performance audio processing sound card, suitable for aircraft cockpit communication scenarios, to solve the problems of efficient processing, high noise suppression and low-latency real-time transmission of multi-channel audio signals in airborne environments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model proposes an airborne multi-channel high-performance audio processing sound card, including a power conversion circuit, a data processing circuit, an audio acquisition circuit, and an audio output circuit. The data processing circuit interacts with the airborne control host and airborne wireless communication equipment, respectively. The data processing circuit is also connected to the audio acquisition circuit and the audio output circuit through an ADDA chip. The input terminal of the audio acquisition circuit is connected to the output terminal of the airborne headset microphone group, and the output terminal of the audio output circuit is connected to the input terminal of the airborne headset microphone group. The input terminal of the power conversion circuit is connected to the airborne power supply, and the output terminal is connected to the audio acquisition circuit, the ADDA chip, the audio output circuit, and the data processing circuit. The power conversion circuit, data processing circuit, audio acquisition circuit, and audio output circuit are all housed on the same board.

[0008] Specifically, the data processing circuit and the ADDA chip interact with each other via the SPI bus and the I2S bus.

[0009] Specifically, the number of ADDA chips is up to 16, with each ADDA chip connected in parallel and each ADDA chip having dual channels. The data processing circuit interacts with up to 8 ADDA chips through a set of SPI buses, and each ADDA chip interacts with the data processing circuit through an independent I2S bus.

[0010] Specifically, the processor in the data processing circuit is an SOPC chip FMQL45T900.

[0011] Specifically, the processor's IP core is an I2S IP core.

[0012] Specifically, the power conversion circuit is composed of a surge current suppression circuit, a reverse connection protection circuit, a filter circuit, a spike pulse suppression circuit, a surge voltage suppression circuit, an undervoltage protection circuit, an overcurrent protection circuit, and a DC / DC conversion circuit connected in sequence.

[0013] Specifically, the surge current suppression circuit includes a MOSFET, which is an NMOS transistor. The drain of the MOSFET is connected to the airborne power supply, the source is connected to the reverse connection protection circuit, the gate is connected to one end of a resistor and the lower plate of a capacitor, the other end of the resistor is grounded, and the upper plate of the capacitor is connected to the airborne power supply.

[0014] The filtering circuit includes a first-stage common-mode inductor filter circuit. The input terminal of the first-stage common-mode inductor filter circuit is connected to the reverse connection protection circuit, and the output terminal is connected to the input terminal of the second-stage common-mode inductor filter circuit. The output terminal of the second-stage common-mode inductor filter circuit is connected to the spike pulse suppression circuit.

[0015] The undervoltage protection circuit includes a diode, the anode of which is connected to a surge voltage suppression circuit, and the cathode of which is connected to an energy storage capacitor and a DC / DC conversion circuit.

[0016] Specifically, the audio acquisition circuit includes a low-pass filter circuit. The input of the low-pass filter circuit is connected to the onboard headset microphone group, and the output is connected to the input of the microphone matching circuit. The output of the microphone matching circuit is connected to the input of the operational amplifier circuit. The output of the operational amplifier circuit is connected to the input of the automatic gain control circuit, and the output of the automatic gain control circuit is connected to the ADDA chip.

[0017] Specifically, the audio output circuit includes an operational amplifier circuit, the input terminal of which is connected to an ADDA chip, and the output terminal of which is connected to the input terminal of a power amplifier circuit. The output terminal of the power amplifier circuit is connected to the input terminal of a single-ended differential converter circuit, the output terminal of the single-ended differential converter circuit is connected to the input terminal of a headphone matching circuit, and the output terminal of the headphone matching circuit is connected to an onboard headphone microphone assembly.

[0018] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0019] (1) In the data processing circuit of this utility model, the processor is selected from the SOPC chip FMQL45T900. The PL part of the processor uses the I2S·IP core. The I2S·IP core transmits digital audio with multiple parallel ADDA chips through the I2S bus. The PS part of the processor configures multiple parallel ADDA chips through the SPI bus, so that the sound card can support multiple channels and can process multiple audio signals in parallel at the same time. Moreover, it can realize high real-time, low distortion and high signal-to-noise ratio audio playback of the headphone group.

[0020] (2) The power conversion circuit, audio acquisition circuit, audio output circuit and data processing circuit in this utility model are all set in the same board, which not only eliminates the interference and distortion caused by long-distance transmission of audio data, but also minimizes the transmission delay of audio data. This utility model can effectively reduce the impact of various interferences in the airborne environment on the sound card's functional performance through the synergistic effect of surge current suppression circuit, reverse connection protection circuit, filtering circuit, undervoltage protection circuit and overcurrent protection circuit, such as aircraft power transfer, common mode / differential mode noise, switching transient voltage impact, surge, high / low frequency ripple and electromagnetic radiation.

[0021] (3) The sound card proposed in this utility model can achieve 99% shielding of cabin noise in silent state, single frequency noise can be identified and shielded in seconds in call state, and internal calls and self-listening can be played in real time in milliseconds.

[0022] (4) The sound card proposed in this utility model has strong versatility and can be flexibly transferred to new products, thereby reducing investment costs. Attached Figure Description

[0023] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a block diagram illustrating the principle of the sound card of this utility model;

[0026] Figure 2 This is a schematic block diagram showing the connection between the data processing circuit and the ADDA chip of this utility model.

[0027] Figure 3 This is a block diagram of the power conversion circuit of this utility model;

[0028] Figure 4 This is a block diagram of the surge current suppression circuit of this utility model;

[0029] Figure 5 This is a block diagram of the filter circuit principle of this utility model;

[0030] Figure 6 This is a block diagram of the undervoltage protection circuit of this utility model;

[0031] Figure 7 This is a block diagram of the audio acquisition circuit of this utility model;

[0032] Figure 8 This is a block diagram of the audio output circuit of this utility model. Detailed Implementation

[0033] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses consistent with some aspects of this invention as detailed in the appended claims.

[0034] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0035] refer to Figure 1This embodiment proposes an airborne multi-channel high-performance audio processing sound card, characterized by comprising a power conversion circuit, a data processing circuit, an audio acquisition circuit, and an audio output circuit. The data processing circuit interacts with the airborne control host and airborne wireless communication equipment, respectively. The data processing circuit is also connected to the audio acquisition circuit and the audio output circuit via an ADDA chip. The input terminal of the audio acquisition circuit is connected to the output terminal of the airborne headset microphone group, and the output terminal of the audio output circuit is connected to the input terminal of the airborne headset microphone group. The input terminal of the power conversion circuit is connected to the airborne multi-channel high-performance audio processing sound card, characterized by comprising a power conversion circuit, a data processing circuit, an audio acquisition circuit, and an audio output circuit. The power supply is connected to the output terminal, which is connected to the audio acquisition circuit, ADDA chip, audio output circuit, and data processing circuit. The power conversion circuit, data processing circuit, audio acquisition circuit, and audio output circuit are all located on the same board. This design not only eliminates the interference and distortion caused by long-distance audio data transmission, but also minimizes the transmission delay of audio data. The external 28V power supply can be converted to ±15V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, and 1.0V through the power conversion circuit, directly powering the various circuits of the sound card.

[0036] refer to Figure 2In this embodiment, the data processing circuit and the ADDA chip interact via SPI and I2S buses. The data processing circuit configures the parameters of the ADDA chip via the SPI bus and performs audio digital interaction with the ADDA chip via the I2S bus. The number of ADDA chips can be set according to requirements, up to a maximum of 16. Each ADDA chip is connected in parallel and has dual channels. In this embodiment, there are 8 ADDA chips, each interacting with the data processing circuit via an independent I2S bus. The data processing circuit interacts with a maximum of 8 ADDA chips via a single SPI bus. For example, if the number of ADDA chips is less than or equal to 8, only one SPI bus is needed between the data processing circuit and the ADDA chips. If the number of ADDA chips is greater than 8, at least two SPI buses are required between the data processing circuit and the ADDA chips. The processor in the data processing circuit uses the domestically produced Fudan Microelectronics high-performance heterogeneous multi-core SOPC chip FMQL45T900, which integrates a quad-core processor-based Processing System (PS) and FMSH Programmable Logic (PL). The quad-core CPU serves as the core of the PS (Power Sequence Controller), with a maximum operating frequency of 800MHz. It is capable of supporting the embedded operation of domestically produced systems and the macroscopic synchronous operation of various anti-interference voice processing algorithms. The PL (Programmable Logic Unit) side features up to 350K programmable logic units and 16 high-speed serial transceivers, along with on-chip memory and abundant I / O peripherals, enabling flexible expansion of dozens of audio channels and real-time communication via high-speed interfaces such as PCIe, SRIO, and Ethernet. The processor uses an I2S IP core, which is configured and communicates with the processor via the AXI bus. The I2S IP core transmits digital audio to multiple parallel ADDA chips via the I2S bus. The PS part of the processor configures multiple parallel ADDA chips via the SPI bus, thereby achieving synchronous acquisition or playback of multiple analog audio channels. This not only ensures that the acquired multi-channel audio is synchronously transmitted to the data processing circuit for subsequent software processing, but also enables high real-time performance, low distortion, and high signal-to-weight ratio audio playback for headphone groups.

[0037] refer to Figure 3In this embodiment, the power conversion circuit is composed of a surge current suppression circuit, a reverse connection protection circuit, a filter circuit, a spike pulse suppression circuit, a surge voltage suppression circuit, an undervoltage protection circuit, an overcurrent protection circuit, and a DC / DC conversion circuit connected in sequence. The surge current suppression circuit, the reverse connection protection circuit, the filter circuit, the undervoltage protection circuit, and the overcurrent protection circuit work together to effectively reduce the impact of various interferences in the airborne environment on the sound card's functional performance, such as aircraft power switching, common-mode / differential-mode noise, switching transient voltage surges, surges, high / low frequency ripple, and electromagnetic radiation.

[0038] refer to Figure 4 The surge current suppression circuit includes a MOSFET, specifically an NMOS transistor. The drain (D) of the MOSFET is connected to the onboard power supply, the source (S) is connected to the reverse connection protection circuit, and the gate (G) is connected to one end of a resistor and the lower plate of a capacitor. The other end of the resistor is grounded, and the upper plate of the capacitor is connected to the onboard power supply. The function of the surge current suppression circuit is to reduce the inrush current during startup. The single-channel MOSFET acts as a variable resistor in the initial power-on stage, increasing the overall circuit impedance and suppressing the surge current. At the moment of power-on, the resistor and capacitor form a delayed start-up, controlling the MOSFET to gradually turn on and operate in the variable resistance region, thus achieving the current limiting function.

[0039] refer to Figure 5 The filtering circuit includes a first-stage common-mode inductor filter circuit. The input terminal of the first-stage common-mode inductor filter circuit is connected to the reverse connection protection circuit, and the output terminal is connected to the input terminal of the second-stage common-mode inductor filter circuit. The output terminal of the second-stage common-mode inductor filter circuit is connected to the spike pulse suppression circuit. The filtering circuit uses two stages of common-mode inductors for filtering, which can reduce and eliminate interference from high-frequency voltage signals in the power input line.

[0040] refer to Figure 6 The undervoltage protection circuit includes a diode, the anode of which is connected to a surge voltage suppression circuit, and the cathode is connected to an energy storage capacitor and a DC / DC conversion circuit. The undervoltage protection circuit can calculate the size of the energy storage capacitor based on a formula and the power consumption of the device.

[0041] refer to Figure 7 In this embodiment, the audio acquisition circuit includes a low-pass filter circuit. The input terminal of the low-pass filter circuit is connected to the onboard headset microphone group, and the output terminal is connected to the input terminal of the microphone matching circuit. The output terminal of the microphone matching circuit is connected to the input terminal of the operational amplifier circuit. The output terminal of the operational amplifier circuit is connected to the input terminal of the automatic gain control circuit. The output terminal of the automatic gain control circuit is connected to the ADDA chip.

[0042] refer to Figure 8In this embodiment, the audio output circuit includes an operational amplifier circuit. The input terminal of the operational amplifier circuit is connected to an ADDA chip, and the output terminal is connected to the input terminal of a power amplifier circuit. The output terminal of the power amplifier circuit is connected to the input terminal of a single-ended differential converter circuit. The output terminal of the single-ended differential converter circuit is connected to the input terminal of a headphone matching circuit, and the output terminal of the headphone matching circuit is connected to an airborne headphone microphone assembly.

[0043] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0044] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. An airborne multi-channel high-performance audio processing sound card, characterized in that, It includes a power conversion circuit, a data processing circuit, an audio acquisition circuit, and an audio output circuit. The data processing circuit interacts with the airborne control host and the airborne wireless communication equipment. The data processing circuit is also connected to the audio acquisition circuit and the audio output circuit through an ADDA chip. The input terminal of the audio acquisition circuit is connected to the output terminal of the airborne headset microphone group, and the output terminal of the audio output circuit is connected to the input terminal of the airborne headset microphone group. The input terminal of the power conversion circuit is connected to the airborne power supply, and the output terminal is connected to the audio acquisition circuit, the ADDA chip, the audio output circuit, and the data processing circuit. The power conversion circuit, data processing circuit, audio acquisition circuit, and audio output circuit are all housed on the same circuit board.

2. The airborne multi-channel high-performance audio processing sound card according to claim 1, characterized in that, The data processing circuit and the ADDA chip interact with each other via the SPI bus and the I2S bus.

3. The airborne multi-channel high-performance audio processing sound card according to claim 2, characterized in that, The number of ADDA chips is up to 16, and the ADDA chips are connected in parallel. Each ADDA chip has dual channels. The data processing circuit interacts with up to 8 ADDA chips through a set of SPI buses. Each ADDA chip interacts with the data processing circuit through an independent I2S bus.

4. The airborne multi-channel high-performance audio processing sound card according to claim 1, characterized in that, The processor in the data processing circuit is an SOPC chip FMQL45T900.

5. The airborne multi-channel high-performance audio processing sound card according to claim 4, characterized in that, The processor's IP core is an I2S IP core.

6. The airborne multi-channel high-performance audio processing sound card according to claim 1, characterized in that, The power conversion circuit is composed of a surge current suppression circuit, a reverse connection protection circuit, a filter circuit, a spike pulse suppression circuit, a surge voltage suppression circuit, an undervoltage protection circuit, an overcurrent protection circuit, and a DC / DC conversion circuit connected in sequence.

7. The airborne multi-channel high-performance audio processing sound card according to claim 6, characterized in that, The surge current suppression circuit includes a MOSFET, which is an NMOS transistor. The drain of the MOSFET is connected to the onboard power supply, the source is connected to the reverse connection protection circuit, the gate is connected to one end of a resistor and the lower plate of a capacitor, the other end of the resistor is grounded, and the upper plate of the capacitor is connected to the onboard power supply. The filtering circuit includes a first-stage common-mode inductor filter circuit. The input terminal of the first-stage common-mode inductor filter circuit is connected to the reverse connection protection circuit, and the output terminal is connected to the input terminal of the second-stage common-mode inductor filter circuit. The output terminal of the second-stage common-mode inductor filter circuit is connected to the spike pulse suppression circuit. The undervoltage protection circuit includes a diode, the anode of which is connected to a surge voltage suppression circuit, and the cathode of which is connected to an energy storage capacitor and a DC / DC conversion circuit.

8. The airborne multi-channel high-performance audio processing sound card according to claim 1, characterized in that, The audio acquisition circuit includes a low-pass filter circuit. The input of the low-pass filter circuit is connected to the onboard headset microphone group, and the output is connected to the input of the microphone matching circuit. The output of the microphone matching circuit is connected to the input of the operational amplifier circuit. The output of the operational amplifier circuit is connected to the input of the automatic gain control circuit. The output of the automatic gain control circuit is connected to the ADDA chip.

9. The airborne multi-channel high-performance audio processing sound card according to claim 1, characterized in that, The audio output circuit includes an operational amplifier circuit. The input terminal of the operational amplifier circuit is connected to an ADDA chip, and the output terminal is connected to the input terminal of a power amplifier circuit. The output terminal of the power amplifier circuit is connected to the input terminal of a single-ended differential converter circuit. The output terminal of the single-ended differential converter circuit is connected to the input terminal of a headphone matching circuit. The output terminal of the headphone matching circuit is connected to the airborne headphone microphone assembly.

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