(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.
double-polarity pulse-amplitude modulation
| Sci-Tech Dictionary: double-polarity pulse-amplitude modulation |
(¦dəb·əl pə′lar·əd·ē ′pəls ¦am·plə′tüd ′mäj·ə′lā·shən)
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