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本文介绍了一种异步双通道ＱＰＳＫ调制解调电路。采用正弦波脉冲位置调制区分ＱＰＳＫ调制中的两个通道数据流。采用这种传输方式，可以传输２×２．０４８Ｍｂｉｔ／ｓ，２×８．４４８Ｍｂｉｔ／ｓ等非标准群路速率的数据信号，并省去复接和分接电路。
This article describes an asynchronous dual-channel QPSK modem circuit. Sine wave pulse position modulation is used to distinguish between two channel data streams in QPSK modulation. Adopting this kind of transmission mode, it can transmit non-standard data rates of 2 × 2.048Mbit / s and 2 × 8.448Mbit / s, eliminating the need for multiplex and tap circuits.