用PC机测量声室混响时间T_(60)的一种方法

A Method for Measuring the Reverberation Time T_(60) Using PC

混响时间是评价声室的基本参量.在分析测量原理的基础上,导出通过测量混响声峰值点电压来估算混响时间T60的近似式,设计了由PC机通过8255芯片控制的测量系统,重点介绍了利用AD574芯片双极性特性设计的数据采集电路.对测量数据的分析表明,测量结果可以满足一般声室测量的要求.

The reverberation time is the most basic comment of the tone chamber. On the basis of analyzing the measuring principle,the author developed a method of measuring the reverberation time T60 ,in which the reverberation sound is picked up through the measuring of the voltage. The system is controlled by PC through 8255. The A/D collection circuit is realized by using AD574. Test results show that this method can meet the needs of the evaluation on the general tone chamber.