基于ISD4004的语音报值交直流电压表的设计：本文介绍了基于语音芯片ISD4004的语音报值交直流电压表的设计。电路由数据采集部分，A/D转换部分，键盘与显示部分，单片机控制部分，语音报值部分和扩展功能部分组成。电路使用了并行与串行总线相结合的方式，使设计与编程灵活简便。创意新颖有趣，富于人性化，避免了频繁观察仪器显示之苦，对减轻工程技术人员的工作量和提高工作效率现实意义。-ISD4004 voice-based value of AC and DC voltage at the design table: In this paper, based on the voice chip ISD4004 voice at the value of AC-DC voltage meter design. Part by the data acquisition circuit, A/D conversion of part of the keyboard and display, single-chip control of the reported value of part of speech and expand the functional parts. The use of a parallel circuit with a combination of serial bus, so as to enable convenient and flexible design and programming. Innovative ideas interesting and full of humanity, to avoid the frequent observation shows that the hardship of equipment, engineering and technical personnel to reduce workload and improve the efficiency of practical significance.