目 录
1 范围··························································································…… (1)
2 引用文献··················································································…… (1)
3 术语和计量单位···········································································…… (1)
3.1 数字音频信号 ·······························································。········…… (1)
3.2 编码格式·················································································……(1)
3.3 采样频率·················································································…… (1)
3.4 字长度····················································································…… (1)
3.5 满度电平·················································································…… (1)
3.6 折叠频率·················································································…… (2)
3.7 带内频率范围············································································一 (2)
3.8 频带上限频率·································。·····························。···········…… (2)
3.9 带外频率·················································································…… (2)
3.10 抖动 ····················································································…… (2)
3.11 单位间隔 ··············································································…… (2)
3.12 上升、下降时间 ·····································································…… (2)
4 概述··························································································…… (2)
5 计量性能要求··············································································…… (2)
5.1 数字音频信号接口输出幅度·························································…… (2)
5.2 数字音频信号幅度·····································································…… (2)
5.3上升、下降时间···········。····························································…… (2)
5.4 抖动信号发生器····································································……(3)
5.5采样频率·················································································…… (3)
5.6 正弦波信号发生器频率响应·························································…… (3)
6 通用技术要求··············································································…… (3)
6.1标志和说明书··································································。········…… (3)
6.2 标记·······················································································…… (3)
6.3 仪器设置·················································································…… (3)
7 计量器具控制··············································································…… (3)
7.1检定条件·················································································……(3)
7.2 检定项目和检定方法····································。·····························…… (4)
7.3 检定结果的处理 ····································································…… (7)
数字音频信号发生器检定规程
范 围
本规程适用于数字音频信号发生器的首次检定、后续检定和使用中检验。
2 引用文献
本规程引用了下列文献:
SYT11180-1998《音频和视听设备数字音频特性基本测量方法》
IEC 60958-1: 1999《数字音频接口 第一部分:通用部分》
(IEC 60958-1:Digital audio interface一Part 1:General)
IEC 61606-1: 2002《音频和视听设备一数字音频部分— 音频特性基本测量方法
第一部分:通用部分》
(IEC 61606一1:Audio and audiovisual equipment一Digital audio parts一Basic measurement
methods of audio characteristic，一Part 1:General)
使用本规程时，应注意使用上述引用文献的有效版本。
3 术语和计f单位
本规程采用SLT 11180一1998有关术语定义。
3.1数字音频信号 (digital audio signal)
用一系列采样的数字数据表示的音频信号。
3.2 编码格式 (coding format)
带有控制信息并与设计的被测设备标准一致的数据码流系列。
注:数字音频数据在本规程中为二进制2的补码数据。
3.3 采样频率 (sampling frequency) (f,)
数字音频信号的采样频率是可以对相应通道重复进行连续数据采样的速率。
3.4 字长度 (word length)
音频采样数值的字长度表示为最低有效位不可忽略时的比特数，通常为8一24bit等
等。
