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In order to meet the requirements of real-time recording voice and playback in a certain control system, a kind of voice card is designed based on the speech compressed coding, in which FPGA act as the control core. The design realizes 16 channels to collect speech signal which will be coded with ADPCM, and then the voice data will be stored with WAVE format. This compact PCI card can monitor and play any records in specified channel and time period. Compared with the traditional voice card, the innovative point of our design is that the card has the function of audio mixing by applying overlap-adding (OLA) technique. The card not only can record the mixing voice from different channels but also can free to choose the compression ratio. The card structure, working principle and the design of hardware and software are described in detail. Finally, the experiments show that the function of storing voice and playback are in good condition, and the quality of voice is good. These experimental results obviously confirm the feasibility and practicability of our design.