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.

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