中文摘要：

为消除声表面波式小波变换处理器压电基片对频率特性的影响,以及输出换能器的指条数对带宽的影响和解决衍射问题,研制了声表面波式指宽变长小波变换处理器。该处理器选取机电耦合系数为0.64%的X-112°Y LiTaO_3压电基片,输出换能器指条数为36,输入换能器采用指宽变长且声孔径均匀的叉指换能器。设计和制作了尺度2-2声表面波式指宽变长小波变换处理器样品。实验结果表明,声表面波式指宽变长小波变换处理器频率特性曲线光滑,-3dB实验带宽为1.072 MHz,与理论带宽值一致,且不存在衍射问题。

英文摘要：

A novel wavelet transform processor（WTP）using SAW device with unequal electrode width（UEW）has been developed to eliminate the effect of the piezoelectric substrate of the WTP using SAW device on the frequency characteristic and the effect of the electrode number of the output interdigital transducer（IDT）on the bandwidth as well as to solve the problem of diffraction.This WTP using SAW device with UEW uses the X-112°Y LiTaO_3 piezoelectric substrate with the electromechanical coupling coefficient of 0.64%,the electrode numbers of the output IDT were 36 and the input IDT used the unequal electrode width and uniform acoustic aperture.A WTP using SAW device with UEW sample with scale of 2-2 has been fabricated.The experimental results confirmed that the WTP using SAW device with UEW had the features of smooth frequency characteristic curve,-3dB bandwidth of 1.072 MHz and no diffraction.