音频和视听设备.数字音频部件.音频特性基本测量法.第1部分:概述

[中文适用范围]： 本部分 IEC 61606 适用于所有消费类、专业类和个人计算机类音频及视听设备中数字音频部分的音频特性基本测量方法。本标准中描述的通用测量条件和方法，用于测量音频带宽约为系统采样频率一半的设备性能特性，其中音频信息以数字数据形式处理。CD 播放器、DAT 录音机、数字放大器、数字声音广播接收机和带有数字声音的电视广播接收机是示例。本标准描述了具有数字输入和模拟输出，以及模拟输入和数字输出的设备的测试方法。本标准的未来修订将涵盖数字输入/数字输出和模拟输入/模拟输出测试。本标准不适用于有损压缩信号，也不适用于功率放大器。 注 1：具有模拟输入和模拟输出并进行数字信号处理的数字音频系统，由于音频信号的采样和集成的 A/D 和 D/A 转换器的性能，其特性可能与纯模拟音频系统不同。当应用于数字系统时，IEC 60268-3 中描述的测量方法可能无法给出正确的结果。 注 2：所述方法主要基于 32 kHz 及以上的采样频率。 注 3：对于数字输入/数字输出和模拟输入/模拟输出系统的测试，请参考 AES17。 注 4：本标准计划与 IEC 61606（1997）第一版、AES17 和 EIAJ CP-2i50 协调一致。 [外文原描述]： IEC 61606-1:2009 is applicable to the basic methods of measurement of the audio characteristics of the digital audio part of audio and audiovisual equipment for all of consumer use, professional use and personal computer. The common measuring conditions and methods, described in this standard, are used for the measurement of the performance characteristics of equipment having an audio bandwidth equal to approximately one-half of the sampling frequency of a system, where the audio information is processed in the form of digital data. CD players, DAT recorders, digital amplifiers, digital sound broadcast receivers and television broadcast receivers with digital sound are examples. It describes test methods for equipment which has digital input with analogue output and analogue input with digital output. Future revisions of this standard will cover digital-in/digital-out and analogue-in/analogue-out tests. It constitutes a technical revision. The significant technical changes with respect to the first edition are the following: - changed the period of preconditioning; - add A weighting filter in measuring instruments; - correct the wrong reference number; - some inappropriate descriptions have been improved.