PDT手持终端音频子系统的设计与实现  

Design and Implementation of Audio Subsystem in PDT Hand-held Terminal

作　　者：李飞 张松轶 冀峰 白清 LI Fei;ZHANG Songyi;JI Feng;BAI Qing(Hebei Far East Communication System Engineering Co.,Ltd.,Shijiazhuang 050200,China)

机构地区：[1]河北远东通信系统工程有限公司,河北石家庄050200

出　　处：《无线电工程》2019年第5期382-386,共5页Radio Engineering

基　　金：国家重点研发计划基金资助项目(2017YFC0821902)

摘　　要：基于专业数字集群(PDT)手持终端音频子系统的需求,给出了相关软硬件的总体设计,分析了设计中存在的2个核心问题,详细阐述了解决这些问题的关键技术,测试结果证明,系统有效抑制了背景噪音并在2个终端相距50 cm时完全抑制了啸叫,该设计具有可用性和先进性,对终端类设备的音频子系统设计具有指导意义。Based on the requirement of audio subsystem in Professional Digital Trunking (PDT) hand-held terminal,the overall design of relevant hardware is provided,and two core problems in the design are analyzed,with key technologies to solve these problems stated in detail.The test results prove that the background noise is effectively suppressed and the howling is completely suppressed when two terminals is 50 cm apart,which shows the availability and advancement of the design and provides important reference for design of audio subsystem in terminal equipment.

关 键 词：专业数字集群 音频 滤波器 声反馈 啸叫抑制 

分 类 号：TN912.35[电子电信—通信与信息系统]