In order to decrease the impact of far field noise on the airborne VHF radio, a new voice acquisition device based on microphone array amplifier LMV1090 and microprocessor AT89C51 is proposed in this paper. A voice enhancement analog circuit is added to the controller of VHF radio. Compared with digital enhancement methods, the new circuit doesn't need signal amplifiers and A/D or D/A converters, and thus has less change on airborne VHF radio devices. The gains of amplifiers in LMV1090 are controlled by AT89C51 to obtain flexibility. Test results show that the new speech acquisition device has better far field noise suppression effect.%为降低远场噪声对机载超短波电台话音采集的影响,基于麦克风阵列放大器LMV1090和单片机AT89C51重新设计了电台的话音采集装置,在其控制器内增加了模拟的话音增强电路.相比较数字语音增强技术,模拟技术省去了传统的信号放大和A/D、D/A转换电路,对电台硬件改动更少.软件采用单片机控制采集放大器的增益,具备较大的灵活性.试用结果表明,该话音采集装置对远场噪声有较好的抑制效果.
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