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Lossy Audio Compression Applied to Launch Vehicle Acoustic Data
The Journal of the Astronautical Sciences ( IF 1.8 ) Pub Date : 2021-05-04 , DOI: 10.1007/s40295-021-00257-0
Guilherme Coelho da Silva Stanisce Corrêa , Rogério Pirk , Marcelo da Silva Pinho

This work presents a comparison study using a constant bitrate (CBR) and variable bitrate (VBR) configuration on lossy audio formats, which can be chosen as suitable option to compress spacecraft onboard acoustic data. The acoustic data measured during a rocket motor firing test is assessed by comparing the signal compression rates and information distortions yielded by using those configurations. As a result, the compression algorithm to be used for launch vehicle onboard acoustic measurements is defined. The results have shown that among the lossy formats presented, the OPUS format using the VBR configuration has achieved a compression rate of 254:1 at 5 kbps, saving up to 99.6% the required amount of data to be transmitted through a telemetry link when compared to a non compressed data.



中文翻译:

有损音频压缩可用于发射车辆声学数据

这项工作提出了一种对有损音频格式使用恒定比特率(CBR)和可变比特率(VBR)配置的比较研究,可以将它们选择为压缩航天器机载声学数据的合适选项。通过比较信号压缩率和使用这些配置产生的信息失真,可以评估在火箭发动机点火测试期间测得的声学数据。结果,定义了用于运载火箭的机载声学测量的压缩算法。结果表明,在呈现的有损格式中,使用VBR配置的OPUS格式在5 kbps时实现了254:1的压缩率,与之相比,节省了通过遥测链路传输的所需数据量的多达99.6%。到非压缩数据。

更新日期:2021-05-04
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