What is a bandpass filter?

A bandpass filter is designed to allow a specific range of frequencies to pass through while attenuating frequencies outside that range. This characteristic makes it particularly useful in various applications such as audio processing, radio communications, and signal analysis. The filter effectively permits both lower and upper cutoff frequencies, enabling signals within that designated band to transmit clearly while filtering out unwanted signals.

In contrast to other types of filters, such as those that might boost all frequencies or block only high-frequency signals, a bandpass filter specifically targets a defined frequency range for transmission, demonstrating its unique functionality in handling signals. Additionally, a bandpass filter does not convert alternating current (AC) to direct current (DC), as that pertains to a different process involving rectification rather than frequency filtering.