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Introduction to 滤器

A 滤器 can be literally any operation on a 信号 Rabiner et al 1972 ! But the most common 用 of the 术语 描述 设备 that 提升 or 衰减 regions of a 声波 频谱 which is the 用途 we take up here Such 滤器 作品 by using one or both of these 方法

· Delaying a copy of an 输入 信号 slightly by one or 几个 采样 周期（时期） and 合并 the 延迟 输入 信号 with the new 输入 信号 figure 5 21a

· Delaying a copy of the 输出 信号 and 合并 it with the 输入 信号 figure 5 21b

Although figure 5 21 shows 组合 by 总和 + the 组合 can also be by subtraction - In either 案例 the 组合 of 原始/原创 and 延迟 信号 creates a new 波形 with a different 频谱 By inserting more 延迟 or 混 sums and differences in 各种各样 组合 one can construct a wide 范围（排列） of 滤器 种类