The filter is an electronic device that can enable useful frequency signals to pass through while suppressing useless frequency signals. It is commonly used in signal processing, data transmission, interference suppression, etc. The active low-pass filter circuit is composed of integrated operational amplifiers and passive component resistors and capacitors. Next, we will briefly introduce the function of low-pass filter and the difference between low-pass filter and high pass filter. Let’s have a look!
Difference between low pass filter and high pass filter
low pass filter
Low pass filtering is a filtering method. The rule is that low-frequency signals can pass through normally, while high-frequency signals exceeding the set critical value are blocked and weakened. However, the blocking and weakening amplitude will change according to different frequencies and different filtering procedures (purposes). Sometimes it is also called high-frequency removal filter or treble cut filter. Low pass filtration is the opposite of high pass filtration.
High pass filter
High pass filter, also known as low cut-off filter and low impedance filter, is a filter that allows frequencies higher than a certain intercept to pass through and greatly attenuates lower frequencies. It removes unnecessary low-frequency components or low-frequency interference from the signal.
The difference between a high pass filter and a low pass filter is that a high pass filter allows the high frequency or AC component of the signal to pass through and suppresses the low frequency or DC component. The low-pass filter is a filter that allows the low frequency or DC component of the signal to pass through, and suppresses the high frequency component or interference and noise. Therefore, in general, the low-pass filter retains the signal below the cut-off frequency, while the high pass filter retains the signal above the cut-off frequency.