基于MTK平台的智能数字加模拟对讲技术  

Combination of digital and analog intercom based on MTK platform

作　　者：李志生 蔡志兵 孙明 宋德周 杨志林 Li Zhisheng;Cai Zhibing;Sun Ming;Song Dezhou;Yang Zhilin(Shenzhen Coneox Information Technology Co.,Ltd.,Shenzhen 518133,China)

机构地区：[1]深圳市康凯斯信息技术有限公司

出　　处：《电子测量技术》2018年第10期59-65,共7页Electronic Measurement Technology

摘　　要：为了研究数字对讲与模拟对讲相结合的技术,基于MTK平台Android 4.4系统采集PCM语音数据,利用WebRTC做语音消噪、回声抑制和增益控制,Opus压缩处理,通过RTP/RTCP协议进行网络传输以实现数字对讲。模拟对讲采用模块,CPU通过串口向模块下达参数指令。数字对讲与模拟对讲共用系统的麦克和喇叭,基于优先级实现资源调度。实际测试表明,单一模式时,数字对讲延时260ms左右,音质清晰、底噪较低,模拟对讲在开阔地距离可以达到1km左右,楼宇内部可以达到100m左右。自动切换模式时,二者的性能并未受影响,而且切换比较顺滑。In order to study the combined technology of digital intercom and analog intercom,based on acquisition of PCM voice data in MTK platform Android 4.4 system,using WebRTC to do speech denoising,echo suppression and gain control,Opus compression processing and network transmission through the RTP/RTCP protocol to realize the digital intercom.Analog intercom adopts modules,and the CPU reaches the through the serial port to the module to issue parameter instructions.Digital intercom and analog intercom share the microphone and horn of the system,based on the priority to achieve resource scheduling.The actual test shows that in single mode,the delay of digital intercom is about 260 milliseconds,and the sound quality is clear and the floor noise is low.The analog intercom can reach about1 km in open terrain and about 100 min the building.In automatically switch modes,both performance has not been affected,and the switch is relatively smooth.

关 键 词：数字对讲 模拟对讲 音频 编解码 

分 类 号：TN871[电子电信—信息与通信工程]