He amplified sound with the use of electronic equipment.

他用电子设备放大声音。

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Discussed are how to use CPLD to control ISD2590 sound chips, and its application on consumer electronic equipment control systems in public telephone network is presented.

介绍如何利用可编程逻辑器件(CPLD)来控制ISD2590语音芯片，及其在公用电话网家电控制系统中的应用。

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