| dbo:abstract
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- Filter design is the process of designing a signal processing filter that satisfies a set of requirements, some of which may be conflicting. The purpose is to find a realization of the filter that meets each of the requirements to a sufficient degree to make it useful. The filter design process can be described as an optimization problem where each requirement contributes to an error function that should be minimized. Certain parts of the design process can be automated, but normally an experienced electrical engineer is needed to get a good result. The design of digital filters is a deceptively complex topic. Although filters are easily understood and calculated, the practical challenges of their design and implementation are significant and are the subject of advanced research. (en)
- 频域电子滤波器的设计必须首先考虑任务所需滤波器的类型。首先必须确定滤波器的基本功能，如低通滤波器、高通滤波器、带通滤波器、全通滤波器或者是更为复杂的功能。
* 低通滤波器用于阻止不需要的高频信号。
* 高通滤波器允许高频信号通过，阻止不需要的低频信号成分通过。
* 带通滤波器只允许有限频率范围的信号通过。
* 带阻滤波器允许低于和高于特定频率范围的信号通过，对于这个范围内的频率阻止通过。这种滤波器较少见。 滤波器的一个重要参数是所要求的频率响应。尤其是频率响应曲线的陡峭性和复杂性是滤波器阶数和可行性的一个决定性因素。 一阶滤波器只有一个依赖于频率的成分，这就意味着频率响应就局限在每倍频6 dB。对于许多应用来说，这是不够的，为了实现更陡的斜率，必须使用更高阶的滤波器。 另外必须决定如何实现滤波器：
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*
* 数字滤波器
* 机械滤波器 (zh)
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- 频域电子滤波器的设计必须首先考虑任务所需滤波器的类型。首先必须确定滤波器的基本功能，如低通滤波器、高通滤波器、带通滤波器、全通滤波器或者是更为复杂的功能。
* 低通滤波器用于阻止不需要的高频信号。
* 高通滤波器允许高频信号通过，阻止不需要的低频信号成分通过。
* 带通滤波器只允许有限频率范围的信号通过。
* 带阻滤波器允许低于和高于特定频率范围的信号通过，对于这个范围内的频率阻止通过。这种滤波器较少见。 滤波器的一个重要参数是所要求的频率响应。尤其是频率响应曲线的陡峭性和复杂性是滤波器阶数和可行性的一个决定性因素。 一阶滤波器只有一个依赖于频率的成分，这就意味着频率响应就局限在每倍频6 dB。对于许多应用来说，这是不够的，为了实现更陡的斜率，必须使用更高阶的滤波器。 另外必须决定如何实现滤波器：
*
*
* 数字滤波器
* 机械滤波器 (zh)
- Filter design is the process of designing a signal processing filter that satisfies a set of requirements, some of which may be conflicting. The purpose is to find a realization of the filter that meets each of the requirements to a sufficient degree to make it useful. The filter design process can be described as an optimization problem where each requirement contributes to an error function that should be minimized. Certain parts of the design process can be automated, but normally an experienced electrical engineer is needed to get a good result. (en)
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- Filter design (en)
- 滤波器设计 (zh)
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