ISD4004是一种采用ChipCorder专利技术的语音芯片。此芯片无须A/D转换和压缩就可以直接储存 ,没有A/D转换误差 ,在一个记录位(BIT)可存储250级声音信号 ,相当于通常的A/D记录的8倍。片内集成了晶体振荡器、麦克前置放大器、自动增益控制等 ,只要很少的外围器件 ,就可以构成一个完整的声音录放系统。本文介绍了ISD4004的原理、特点、功能及其在智能控制系统中的应用 The ISD4004 is a voice chip using ChipCorder’s patented technology. This chip can be directly stored without A / D conversion and compression without A / D conversion error. It can store 250 sound signals in one recording bit (BIT), equivalent to 8 times of normal A / D recording. On-chip integrated crystal oscillator, mic preamplifier, automatic gain control, as long as a small number of peripheral devices, you can form a complete audio recording and playback system. This article introduced ISD4004 the principle, the characteristic, the function and its in the intelligent control system application