摘要
指向性传声器测试中,前后向灵敏度差异(front-to-rear sensitivity index)和指向性图形(polar pattern)均为常用的测试项。但该两项指标的测试值往往依赖于测试室和测试工装的声反射情况。在特定方向测试传声器的时候,传声器仍然可以拾取测试角度以外的声信号。为此,需要在测试中多加注意。从理论上分析了反射声对指向性测试的影响程度,给出了一种在消声室中识别反射面的方法。
The front-to-rear sensitivity index and polar pattern chart are common specifications of directional microphones. However, the measured value depends highly on the reflection condition of the test room, so special care should be taken in measurements. The present study presents a model to discuss the extent of influence of reflected sound waves on the front- to- rear sensitivity index. A method of identifying reflective objects in anechoic chambers is also showed.
出处
《电声技术》
2014年第8期23-26,共4页
Audio Engineering
关键词
传声器
指向性
指向性因数
指向性图形
microphone
directivity
directivity index （DI）
polar pattern
