Standard No.:	GB 4963-1985
English Name:	Normal equal-loudness contours for pure tones under free field listening conditions
Chinese Name:	自由场纯音标准等响线
Chinese Classification:	A42    Physics and Mechanics
Professional Classification:	GB    National Standard
Source Content Issued by:	China State Bureau of Standards
Issued on:	1985-02-28
Implemented on:	1985-10-1
Status:	abolished
Superseded by:	GB/T 4963-2007 Acoustics—Normal equal-loudness-level contours
Superseded on:	2008-5-1
Abolished on:	2008-05-01
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	90.0
Delivery:	via email in 1~3 business day

本标准规定了在自由场测听条件下等响时纯音的声压级和频率间的关系，并给出了从声音的物理性质(如声压级)来计算响度级的方法。它是描述人类听觉系统的基本性质，在心理声学中有重要意义。本标准同时还给出了最小可听声场(MAF)，这是等响线中的一个特殊情况。