教学扩声的理论与实践探索

Research on the Theory and Practice of Teaching Sound Reinforcement

教学扩声是课堂教学的重要组成部分,但传统的手持有线麦克风和佩戴无线麦克风等扩声方式已不能满足当前的教学需求。基于此,文章首先从教学扩声系统的发展历程入手,对教学扩声中的声音响度和声像一致性进行分析研究,指出了手持有线麦克风和佩戴无线麦克风等传统扩声方式存在的问题。接着,文章结合应用实践详细阐述了吊麦扩声的优势,从反馈抑制算法和回声消除算法两个方面对吊麦扩声的关键技术难点进行分析,从教学实际应用的角度对吊麦扩声做了趋势展望,以期为学校后续教学扩声的研究、建设与应用提供参考。

Teaching sound reinforcement is an import component of classroom teaching, while traditional handheld wired microphone and wearable wireless microphone no longer satisfied teaching requirements. From the development history of teaching sound reinforcement system, this paper firstly analyzed the sound loudness and audio-visual consistency in teaching sound reinforcement and pointed out the problems existing in traditional sound reinforcement technologies of handheld wired microphone and wearable wireless microphone. Secondly, the advantages of hanging microphone were expounded with the application practice, and the key technical difficulties of hanging microphone were analyzed from the aspect of feedback suppression algorithm. Finally, the development trend of hanging microphone was prospected from the view of practical application in teaching. This paper aimed at providing reference for schools’ further research, construction and application of teaching sound reinforcement.