Low-latency on-board Ethernet audio stream processing system and method

Abstract

The invention discloses a low-latency on-board Ethernet audio stream processing system. The system comprises an audio module, an FPGA module, and an interface module, wherein the audio module is connected with the interface module through the FPGA module, the audio module receives and plays an analog audio processed by the FPGA module, and collects and sends an analog audio to the FPGA module, theFPGA module receives and decodes the analog audio sent by the audio module so as to obtain a digital audio, packages the digital audio according to an ARINC628P3 protocol and then sends out through the interface module, receives an audio data packet sent by the interface module, unpacks according to an ARINC628P3 protocol and then processes to obtain an analog audio and sends the analog audio tothe audio module, and the interface module provides an interface between the external environment and the FPGA module, an interface circuit between the FPGA module and periphery, and provides power for devices. Through adoption of the low-latency on-board Ethernet audio stream processing system, the problem that audio broadcast freezes or has noise due to overlarge fluctuation of processing latency is solved.

Description

technical field [0001] The invention relates to an airborne audio data processing system, in particular to a low-latency system for processing airborne Ethernet audio streams. Background technique [0002] The cross-linking method of the airborne avionics system is gradually shifting from traditional low-speed protocols, such as ARINC429, RS485 and other bus protocols, to 100M / 1000M or even 10GbE. The Ethernet implementation in the traditional airborne or computer system is based on the TCP / IP protocol stack implemented by the CPU. Its disadvantage lies in the complexity of the TCP / IP protocol stack and the scheduling algorithm of the CPU. The delay of the Ethernet message depends on the CPU. Scheduling, so the delay jitter is large, and the audio processing cycle defined by ARINC628P3 is 4ms, and the audio playback effect is sensitive to the processing delay. If the processing delay fluctuates too much, the sound playback will appear stuttering or noise, so if you use a tra...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is the high-speed processing of airborne audio, and the purpose is to provide a low-latency system for processing airborne Ethernet audio streams, so as to solve the problem of lagging or noise in sound playback due to excessive fluctuations in processing delays

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