公开(公告)号：US3908137A

公开(公告)日：1975-09-23

申请号：US42003873

申请日：1973-12-26

申请人： MAGNAVOX CO

发明人： HUNSINGER BILL J ,  CHO FREDERICK Y ,  FUGIT BRIAN B

IPC分类号： G10K11/36 ,  H03H9/02 ,  H03H9/145 ,  H01L41/08 ,  H03H7/30

CPC分类号： H03H9/0285 ,  G10K11/36 ,  H03H9/14508 ,  H03H9/1455

摘要： Apparatus and method for reduction of triple transit signals generated by the interaction between acoustic surface waves and transducer elements in acoustic surface wave devices. Input transducers are positioned such that the transit time between a first input transducer and an output transducer is delayed by a quarter of a wavelength relative to the transit time between a second input transducer and the output transducer. The input signal to the second input transducer is delayed externally by a length of time equivalent to a quarter of a wavelength. The output transducer signals can therefore be combined to produce an enhanced output signal. Acoustic surface waves generated at an output transducer and returned to the output transducer after interaction with the first input transducer will be retarded two quarter wave lengths (one for each transit) as compared to acoustic surface simultaneously generated at an output transducer and returned to the output transducer after interaction with the second input transducer. Because of the phase relationship, the signals generated at the output transducers as a result of acoustic wave interactions with the two input transducers will cancel when combined.

摘要翻译： 用于减少由声表面波和声表面波装置中的换能器元件之间的相互作用产生的三重转接信号的装置和方法。 输入传感器被定位成使得第一输入传感器和输出传感器之间的传播时间相对于第二输入传感器和输出传感器之间的传播时间被延迟四分之一波长。 到第二输入传感器的输入信号在外部延迟等于四分之一波长的时间长度。 因此，可以将输出的换能器信号组合以产生增强的输出信号。 与输出变换器相互作用时返回到输出变换器的声表面波与在输出变换器同时产生的声表面相比将延迟两个四分之一波长（每个转接一个） 换能器与第二输入换能器相互作用。 由于相位关系，当与两个输入换能器的声波相互作用时，在输出换能器处产生的信号在组合时将被取消。