新的IEEE标准-非活动撤销。 以下是IEEE第170号（53 IRE ll.Sl）“调制系统标准:术语定义，1953年”的修订版本文不打算涵盖IEEE第171号（58 IRE ll.Sl）中包含的信息论主题，IRE信息论标准:术语定义，1958年。 然而，一些边缘术语，如编码和奈奎斯特速率，已被列入清单。这仅仅反映了一个事实，即这两个标准在主题的相邻领域定义了术语。 本标准中给出的定义旨在反映最新的用法，并 提高清晰度和精确度。新增加了捕获效果等术语，而 不再使用的术语，如双源频率键控，已被删除。

New IEEE Standard - Inactive-Withdrawn. The following constitutes a revision of IEEE No.170 (53 IRE ll.Sl), "Standards on Modulation Systems: Definitions of Terms, 1953." It is not intended to cover the subject matter of Information Theory which is contained in IEEE No.171 (58 IRE ll.Sl ), IRE Standards on Information Theory: Definitions of Terms, 1958. Nevertheless, a few borderline terms, such as Coding and Nyquist Rate, have been included in the list. This merely reflects the fact that the two Standards define terms in adjoining areas of subject matter. The definitions given in this Standard are intended to reflect the latest usage and also to improve the clarity and precision. Terms such as Capture Effect have been newly added, while terms no longer in use, such as Two-Source Frequency Keying, have been deleted.