The Difference and Function of Low Pass Filter and High Pass Filter

A filter is an electronic system that enables effective frequency signals while suppressing unwanted frequency signals. It is commonly used for signal processing, data transmission, and interference suppression. An active low-pass filter circuit consists of integrated transportation, passive component resistors, and capacitors. Next, this article will briefly introduce the efficacy of low-pass filters and their differences from high-pass filters. Let's take a look!

Difference between low pass filter and high pass filter

Low-pass filter Low-pass filter is a filtering method in which low-frequency signals can be normally based, while high-frequency signals that exceed a critical point are isolated and weakened. However, the scope of isolation and weakening will vary depending on the number of times and the filtering process (purpose). It is sometimes referred to as a high-frequency clear filter or a maximum clear filter. Low base filtration is the opposite of high pass filtration.

High pass filter High pass filter, also known as low cutoff filter and low resistance filter, allows frequencies above a certain frequency and greatly attenuates low frequency filters. It removes unnecessary low-frequency components or low-frequency effects from the signal.

The difference between a high pass filter and a low pass filter is that a high pass filter is a filter that allows the high frequency or AC weight in the signal to be based to suppress the low frequency or DC weight. Low pass filters are filters that allow low frequency or DC weight in the signal to be based to suppress high frequency weight or influence and noise. Therefore, in general, low-pass filters store signals below the cutoff frequency, while high-pass filters store signals above the cutoff frequency.

1. Classification of High Pass Filters and Low Pass Filters

SallenKey is the most common topology for high pass and low pass filters. Classify active high pass filters, passive high pass filters, or primary and secondary high pass filters.

2. Using high pass and low pass filters

In power supply systems, harmonic compensation uses high-pass filters to filter out one or more harmonics. Low-pass filters are used to drive subwoofers and other types of loudspeakers, as well as to prevent high pitch rhythms that they cannot effectively propagate.

3. According to frequency, high pass filter and low pass filter

The low channel standard is a normal basis for low frequency signals, while high frequency signals exceeding the set threshold are isolated and weakened. High channel standards are the normal basis for high-frequency signals, while low-frequency signals below the set threshold are isolated and weakened.

Effectiveness of low-pass filters

1. Low-pass filters are the basis for allowing signals below the cutoff frequency, a combination of components or electronic circuits that cannot pass signals above the cutoff frequency.

2. Low-pass filters can be applied to audio regulators to promote the separation of the bottom tones in the signal, which is sent to independent amplifiers to facilitate the operation of bass speakers.

3. In radio transmitters, low-pass filters can be used to block harmonic transmissions that may affect other communications.

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