Basic knowledge of filter

: Fundamentals; In signal processing, A Filter is a Device or Process that removes some unwanted components or features from a signal. F

: Types; Learn about Various Types of Filters here. The use of a digital filter can be broken into three categories: time domain,

: Applications; In electronics, there are many practical applications for filters, such as radio communications, DC power supplies, audi

Welcome to the Filters!

Fundamentals

In signal processing, A Filter is a Device or Process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Most often, this means removing some frequencies or frequency bands.

There are many different bases of filters, including center frequency, cutoff frequency, frequency response, stopband frequency, -3dB Frequency (f3dB), bandwidth (β or B.W.), insertion loss, quality factor (Q), ripple, passband ripple, return loss, stopband suppression, time domain, frequency domain, custom, delay and so on. Read more about filter info, here it is.

Types

Learn about Various Types of Filters here. The use of a digital filter can be broken into three categories: time domain, frequency domain and custom. In addition, the four primary types of filters include the Low-pass Filter, the High-pass Filter, the band-pass filter, and the notch filter (or the band-reject or band-stop filter), and they can be active or passive filters.

Certain filters may be specified by family and bandform, and each family of filters can be specified to a particular order. An ideal filter has full transmission in the pass band, complete attenuation in the stop band, and an abrupt transition between the two bands, but this filter has infinite order. Learn more about Classification of Filters from this page.

Applications

In electronics, there are many practical applications for filters, such as radio communications, DC power supplies, audio electronics, analog-to-digital conversion, etc.

One important application of filters is in telecommunication, and multilevel and multiphase digital modulation systems require filters that have flat phase delay. In a word, filters serve a critical role in many common applications. This page is giving more Professional Filter Applications to readers.

Popular Ariticles

Date: 2020.11.21 Category: Filters 272

What is a RC Filter Circuit?

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IntroductionAs we all know, the most basic passive linear components are resistors (R), capacitors (C) and inductive components (L). These components can be used to form 4 different circuits: RC circuit, RL circuit, LC circuit and RLC circuit. They have some important properties for analog electroni...

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What is A Bandpass Filter?

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IntroductionA band pass filter is an electronic device or circuit that allows signals between two specific frequencies to pass. That is, allowing signals in a specific frequency band to pass while shielding other frequency bands. In other words, a band-pass filter attenuates frequency components in ...

Date: 2020.05.26 Category: Filters 738

What is a High Pass Filter?

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Ⅰ IntroductionA high-pass filter (HPF), also called a low-cut filter or bass-cut filter, passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. That is, unnecessary low-frequency components or low-frequency sign...

Date: 2019.12.06 Category: Filters 2107

Filter (Signal Processing) Basics in Electronics

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Ⅰ. Filter DefinitionIn electronics, a filter (signal processing) is a kind of devices or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect o...

Date: 2019.10.19 Category: Filters 1715

Four Typical Electronic Filters (Signal Processing)

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IntroductionIn modern telecommunication equipment and various control systems, the filters (signal processing) are extremely widely used. Among all electronic components, the most used and most complicated technology is the filter. The advantages and disadvantages of the filter directly determine th...

Date: 2019.08.06 Category: Filters 9321

EMI Filter Basics - Operational Principles and Faulty Installation

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Ⅰ Introduction1.1 EMI Filter DefinitionThe EMI filter (electromagnetic interference filter) is a filter circuit composed of a capacitor, an inductor and a resistor, also called RFI Filters or radio-frequency interference filters. Its filter circuit composed of capacitor, inductor and resistor. A pas...

Date: 2019.08.02 Category: Filters 1436

Classification of Electronic Filters

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IntroductionThe electronic filter is an arrangement of electronic components used in a circuit to transmit signals within a given frequency range, rejecting others. Electronic filters are used in radios, television receivers, telephone systems, etc. Electronic Filters: Types of Electronic Filters...

Date: 2019.06.28 Category: Filters 3083

What Is A Low Pass Filter Circuit?

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Low pass active filters are covered in this presentation. For those people who have never worked with filters, a short overview of terminology relating to filter characteristics and terminology precedes the actual discussion. The Sallen-Key topology and Butterworth low pass filter are discussed, o...

Date: 2019.02.26 Category: Filters 7659

Common Applications of Filter

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Warm hints: This article contains about 4500 words and reading time is about 20 mins. Ⅰ IntroductionFiltering is a fundamental and important technique in signal processing. Filtering technology can extract the desired signal from various signals and filter out unwanted interference signals. A filte...

Date: 2019.02.18 Category: Filters 1255

Electronic Filters: Filter Citcuits and Applications

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Warm hints: This article contains about 4000 words and reading time is about 18 min. IntroductionFilters, as the name suggests, are devices that filter waves. "Wave" is a very broad physical concept. In the field of electronic technology, "wave" is narrowly limited to the process of describing the ...