多路音频输入的机载话音系统噪声问题分析OA

After the maintenance of the aircraft,the single system of multi-channel audio inputs airborne voice system works normally,but the complex multiple low-frequency interference occurs when multiple systems of the whole aircraft work at the same time,which causes the noise of the headphone terminal and the hearing fa-tigue of the crew members.The mechanism of noise interference is analyzed,and the methods of finding inter-ference sources and the maintenance methods that can be used in maintenance are put forward.The audio sound pressure spectrum test is innovatively applied to the noise sampling and technical parameter calculation of the headphone terminal of a certain type of multi sortie aircraft.Combined with the basic theoretical analysis of electromagnetic compatibility and interference,the closed loop is formed through multi sample sampling,the-oretical analysis and derivation,maintenance and debugging,and use effect verification.The technical improve-ment are carried out on the sampled multi sortie airborne voice system to meet the hearing requirements of the crew for headphone audio.The proposed"three segment three sampling"method for troubleshooting the noise fault of the headphone terminal of the multi-channel audio input airborne voice system,as well as the refined"three source"interference model of this kind of multiple low-frequency interference,which is not a single source and is differentiated and superimposed by the interference sources of different sorties of aircraft,provi-ding theoretical guidance,troubleshooting methods and basic ideas for effectively eliminating this kind of fault after the maintenance of the whole machine.