针对国防工业领域音频输出需求,基于脉冲编码调制(PCM)方式,采用大规模现场可编程逻辑器件FPGA,接收外部CPCI等高速总线音频数据,然后通过时钟数据同步总线把数据输出至低速音频AD1851/AD1861等DA数模转换器件,数模转换后输出,供听觉指示使用.验证测试结果表明,该技术解决方案结构简单,接口适用性强,输出更新频率用户可调节,支持12k、16k等用户任意定义非标特殊频率.提出的方法可用于国防与工业领域音频系统设计,也可用于任意波形发生器、DA模拟输出等电子产品设计中.%This paper proposes a technical approach based on the FPGA,and receives the audio data from the highspeed bus,such as CPCI,then outputs the data to low-speed audio AD1851 /AD1861 chip through clock data synchronization bus.After D/A conversion,the sound is output.The test result shows:technical architecture is simple and reliable,bus interface is adaptable,12k and 16k special frequency is realized.The method has a good application in audio system in defense industry field and electrical product of AWG and DA analogue output.
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