“polar transmission”的概念、定义、翻译、参考文献-科学参考

单词	polar transmission
释义	polar transmission [`pō·lǝr tranz`mish·ǝn] ^{COMMUNICATIONS} 1. A method of signaling in teletypewriter transmission in which direct currents flowing in opposite directions represent a mark and a space respectively, and absence of current indicates a no-signal condition. 2. By extension, any system of signaling that uses three conditions, representing a mark, a space, or a no- signal condition.
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