| 单词 | negative modulation | 
| 释义 | negative modulation [`neg·ǝd·iv ´mäj·ǝ`lā·shǝn]  ELECTRONICS 1. Modulation in which an increase in brightness corresponds to a decrease in amplitude-modulated transmitter power; used in United States television transmitters and in some facsimile systems.  2. Modulation in which an increase in brightness corresponds to a decrease in the frequency of a frequency-modulated facsimile transmitter. Also known as negative transmission.  | 
	
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