Objective 1 To evaluate the character of color Doppler and frequency spectrum Doppler of cerebral artery stenosis by examining the patients who were suspected with cerebrovascular disease with TCCS.
目的1对怀疑有脑血管疾病的患者进行经颅彩色多普勒超声（TCCS）检查，探讨颅内动脉狭窄的彩色多普勒及频谱多普勒特征。
Further more, in view of periodical character of dam observation data, a frequency spectrum analysis method for data treatment is suggested.
针对大坝观测资料周期性较强的特点，首次提出了频谱回归及分析法。
This scheme makes use of the advantages of wavelet to improve the frequency spectrum compart character between different channels, the transmission is very well even under the badly ISI condition.
这种方案利用小波变换特殊的优越性，使得各子信道之间的频谱分隔特性大大改善，并在码间干扰严重的情况下，仍然具有较好的传输性能。
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