ISD4004语音系列芯片是美国ISD公司推出的产品，具有多次重复录放，存储时间长，使用时不需扩充存储器，所需外围电路简单等特点。本文将结合ISD4004芯片在语音报站器中的一个实际应用，对其功能和使用方法做一简单介绍，从而使读者对ISD4004系列语音芯片的使用有个初步的了解。-Voice chip ISD4004 series launched in the United States ISD s products, with repeated playback, storage for a long time, when used without expanded memory, the required characteristics of the external circuit is simple. This will combine the chip ISD4004 Voice announcement device in a practical application, its features and use a little introduction, so that the reader use voice chip ISD4004 series have a basic understanding.