什么是乐队停止过滤器:理论及其应用

有不同类型的过滤器喜欢高通滤波器,低通滤波器,带通滤波器和BandStop过滤器。高通滤波器仅允许频率高于切断频率,低通滤波器允许低于切断频率的频率。带通滤波器将允许特定的频带和带停止滤波器抑制特定的频带。本文讨论了概述了band-stop filter and its working

What is the Band Stop Filter?

The bandstop filter is formed when alow pass filterand a high pass filter are connected in parallel with each other. The main function of the bandstop filter is eliminating or stopping the particular band of frequencies. The bandstop filter is also referred with some other names like band-reject or notch or band elimination filter. As discussed previously, For high pass filter there will be one cut off frequency, low pass filter also has one cut off frequency but this bandpass and bandstop filters have two cut off frequencies.


This band stop过滤将拒绝在两个切断频率之间存在的特定频率范围。它允许高于高切断频率和低于低切断频率的频率。这两个切断频率是基于值确定的组件used in the design of the circuit. This filter has a stopband and two passbands.

Ideal Characteristics of the Band Stop Filter
Ideal Characteristics of the Band Stop Filter

在这个数字中清楚地证明了BandStop过滤器的理想特性

'fl'=切断低通滤波器的频率

'fh'=切断高通滤波器的频率


带通和Bandstop过滤器的工作和特性彼此完全相反。

频段停止滤波器理论

当信号被赋予输入时,低通滤波器允许低频通过电路,并且高通滤波器允许高频通过电路。

频率响应
频率响应

这是bandstop过滤器的框图。Low pass filter and high pass filter are connected in parallel. There is some difference between ideal and practical conditions while working with the filter. This difference is due to the switching mechanism of a capacitor. The frequency response can be clearly explained in the above figure.

Band Stop Filter using R, L & C

在电路中电阻器, inductor and capacitor are connected. The output is taken across the inductor and capacitor which are connected in series. The circuit will become a short circuit or open circuit basing on the frequency given at input. For high frequency, capacitor becomeshort circuit电感器将是开路和低频,电感器用作开路等短路和电容器。

Band Stop Filter using RLC
Band Stop Filter using RLC

由于这种并联连接capacitor and inductor, we can say that at low and high frequencies, it becomes an open circuit and during mid-range frequencies. It behaves as a short circuit. So that’s why mid ranges are not allowed through the circuit and thus acts as a band-reject filter.

滤波器作为短路的频率集合依赖于较低且较高的截止频率。这些切断频率取决于设计时使用的组件及其值。根据设计,传递函数确定组件值。

Notch Filter

The narrow stop band filter is referred to as the NOTCH filter. For the elimination of single frequency, this notch filter is used. It is also called as twin T network due to its two T shaped networks. At center frequency fC = 1/2πRC, maximum elimination takes place.

The capacitor and resistor are used in the notch filter circuit. Capacitor value must be less than or equal to 1µF. the value of the resistor can be calculated by using the equation of center frequency.

This notch filter is very much useful in eliminating single frequency at 50 or 60Hz.

频率响应of Filter
频率响应of Filter

The frequency response of the bandstop filter can be obtained by recording gain and frequency.
Across lower and higher cut off frequencies, bandwidth is obtained. The stopband should have again o0f zero and the passband should have a gain of Amax according to the ideal stop-band filter.

Applications

The applications of the band-stop filter include the following.

  • 在电吉他放大器中,有效地使用带柄过滤器。通常吉他在60Hz频率下产生嗡嗡声。使用的BandStop滤波器有助于减少蜂扣以放大信号。不仅在这个吉他中,还可以在基础仪器放大器和曼陀林等声学应用中使用过滤器。
  • 带硬炉滤波器用于图像和信号处理,以减少噪声
  • 为了减少无线电在无线电上,使用这些BandStop滤波器。
  • The bandstop filter is used in medical field applications like biomedical instruments for the removal of noise.
  • In DSL internet services and noise reducers, these bandstop filters are used for removing interference on the line.
  • 如果在通信中发生噪声,则信号将变形,这将升高输出中的错必威体育怎么登录误。因此,为了减少这种不需要的谐波和错误,BandStop滤波器有效使用
  • 在PA系统等音频应用中,公共地址系统,使用此过滤器。
  • 在用于消除扭曲的光通信必威体育怎么登录技术中,使用这些BandStop滤波器。其中一个例子是拉曼光谱。

Thus, this is all about aBandStop过滤器的完整视图。该频带停止滤波器由一个停止带和两个通带组成。带通滤波器和带停止滤波器特性完全相反。该滤波器也称为带抑制滤波器或陷波滤波器。它在其设计中使用了低通滤波器和高通滤波器。两个过滤器都彼此并联连接。它将有两个切断频率,即低截止频率和高频率。这些中频被拒绝,将允许所有其他频率。这是带停止滤波器的完整描述
Here is a question for you, what is a high pass RC filter?

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