声表面波沿固体表面传播,具有抽头和可控的特点。声表面波抽头延迟线(SAWTDL)正是利用这种声波可以在其传播路径任意位置上按需要抽头取样的特性而制成,因而,用于构成各种形式的脉冲序列滤波器如巴克序列、伪随机序列和互补序列等编码译码器是梦寐以求的。 SAW spreads along a solid surface, with taps and controllable features. The SAWTDL is made using the characteristic that this sound wave can be tap sampled as desired at any point in its propagation path. Therefore, the SAWTDL used to construct various types of pulse sequence filters, such as Buck sequences, Codec such as pseudo-random sequence and complementary sequence is the coveted one.