“double-polarity pulse-amplitude modulation”的概念、定义、翻译、参考文献-科学参考

单词	double-polarity pulse-amplitude modulation
释义	double-polarity pulse-amplitude modulation [¦dǝb·ǝl pǝ`lar·ǝd·ē `pǝls ¦am·plǝ´tüd ´mäj·ǝ`lā·shǝn] ^{COMMUNICATIONS} Pulse-amplitude modulation employing pulses of positive and negative polarity, the average value being equal to zero. Also known as bidirectional pulse-amplitude modulation.
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