研制以超声波为载体的电路系统，探测眼部血流多普勒信号，并进行频谱分析。
A set of circuits for detecting ophthalmic blood flow Doppler signals was developed and spectral analysis was realized as well.
本文介绍了H P 8559A频谱分析仪频率测量显示电路的基本工作原理，同时阐述了怎样使用单片机对该型号频谱仪实施改造以改善其频率测量准确度。
This article sum up the principle of frequency display in HP8559A spectrum analyzer. And introduce a design to improve frequency accuracy of measurement by using Single-chip-computer.
实践证明这种频谱分析法具有占用内存小，硬件电路简单，实现方便的优点。
It has been proved that this kind of frequency spectrum analytic approach has more merits and little expenses of memory and the circuit of hardware is simple, realization is convenient.
实践证明这种频谱分析法具有占用内存小，硬件电路简单，实现方便的优点。
It has been proved that this kind of frequency spectrum analytic approach has more merits and little expenses of memory and the circuit of hardware is simple, realization is convenient.
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