The article surveys how to use IRLED to setup the IR voice communication system and to use pre-emphasis and de-emphasis to lower the noise and improve the width and length of the transmission field.

• 本文探讨如何运用近红外光二极体去实现红外线声音通讯，并利用前置强调与去强调的方法降低杂讯，使可传送的范围及距离增加。