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针对声表面波式小波变换阵列中各个尺度器件之间时间不同步的问题,提出补偿输入和输出叉指换能器之间距离,实现时间同步的延时补偿方案。该方案利用了声表面波在晶体基片表面的延时特性,通过在声表面波器件内部进行延时补偿,确保了各个尺度器件在触发信号作用下具有相同的响应时间,避免了由于时间不同步造成阵列器件的小波变换输出结果具有不正确时频特性的问题,推导并给出了对阵列器件进行延时时间补偿的参数计算公式。最后,以一个具体声表面波式小波变换阵列器件的延时补偿为例,说明了该延时补偿方案的有效性。
Aiming at the problem that the time between two devices in different SAW arrays is not synchronized, a compensation scheme is proposed to compensate the distance between input and output interdigital transducers and achieve time synchronization. The scheme utilizes the delay characteristic of SAW on the surface of crystal substrate. By compensating the delay in SAW device, it ensures that each scale device has the same response time under the action of trigger signal, The result of the wavelet transform output of the array device caused by the synchronization has the problem of incorrect time-frequency characteristics, and the formula for calculating the delay time compensation of the array device is deduced and given. Finally, the delay compensation of a SAW-based array is taken as an example to illustrate the effectiveness of the delay compensation scheme.