(R)声音数据采集系统鉴定

[中文适用范围]： 各种 SAE 车辆声级测量程序要求使用符合 ANSI S1.4-1983 的 1 类或 2 类要求的声级计，或可证明可提供等效测试数据的替代系统。本 SAE 推荐做法的目的是提供一种程序，用于确定声音数据采集系统 (SDAS) 是否具有与此类仪表相当的电声性能。通过保证测试仪器的等效性能，可以保证测试数据的等效性。将涵盖声音数据采集系统的两种通用配置。第一种配置由充当声级计的仪器部分组成。第二种配置是记录数据以供以后处理的系统。本文件的目的是建立指南，使测试工程师能够确保声音数据采集系统与声级计的等效性。它要求测试工程师了解所测量的声音数据的特性。 [外文原描述]： Various SAE vehicle sound level measurement procedures require use of a sound level meter which meets the Type 1 or Type 2 requirements of ANSI S1.4-1983 (see 2.1.1.1 ), or an alternative system which can be proved to provide equivalent test data. The purpose of this SAE Recommended Practice is to provide a procedure for determining if a sound data acquisition system (SDAS) has electro-acoustical performance equivalent to such a meter. By assuring equivalent performance of the test instrumentation, the equivalence of test data is assured.Two general configurations of sound data acquisition systems will be encompassed (see Figure 1 ). The first configuration consists of instrument sections which perform as a sound level meter. The second configuration is a system which records data for later processing. The intent of this document is to establish guidelines which permit the test engineer to insure equivalence of sound data acquisition systems to a sound level meter. It requires that the test engineer have a working knowledge of the characteristics of the sound data being measured.The scope of the document includes the system performance requirements for the entire sound measurement system. It provides the methods needed to verify Type 1 or Type 2 instruments. However, it also provides a method to qualify an SDAS that does not meet the requirements in their entirety, but can be used provided knowledge of the test data is obtained and an iterative process is followed in qualifying the SDAS. The system need only be qualified for the dynamic characteristics and weighting mode in which it is to be used. The scope of this document does not include qualification of system components for harmonic distortion, tape recorder wow and flutter, etc. However, these factors must be considered when determining system performance, especially where spectral information is sought. The references in Section 2 should be consulted for general performance requirements and precautions regarding instrumentation for acoustical measurements.Cross Reference: ANSI/S1.1,ANSI/S1.11,ANSI/S1.4,HS184,IECPub.651