设计一种声纳接收机测试用信号源，该信号源的工作原理基于DDS技术和对数DAC。
A signal source in sonar receiver's testing is designed, its working principle is based on DDS technology and log DAC.
设计一种声纳接收机测试用信号源，该信号源的工作原理基于DDS技术和对数DAC。
A signal source in sonar receiver's testing is designed, its working principle is based on DDS technology and log DAC.
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