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本文研究了电话用各种△调制器。在回忆了△M 的原理后,我们将描述现今主要的调制器;包括我们所研制的调制器;我们将介绍一种适应于回路之外的调制器,它具有许多优点。
In this paper, a variety of telephone △ modulator. After recalling the principle of ΔM, we will describe the main modulators of today; including the modulators we have developed; and we will introduce a modulator that fits outside the loop and has many advantages.