Simple Explanation

A filter that lets through only a specific range of frequencies and blocks the rest.

Concise Technical Definition

An electronic filter that passes frequencies within a specified range and attenuates frequencies outside that range, typically defined between two cutoff points (e.g., the -3 dB points).

Layman-Friendly Analogy

Like a security checkpoint that only allows certain people through while others are stopped.

Industry Usage Summary

Used in audio, radio, and communications to isolate or transmit signals within a specific frequency band, such as for vocal processing, wireless transmission, or equalization tasks in mixing.

Engineering Shortcut

Band-Pass Filter = High-Pass + Low-Pass focused on a central frequency band.

Full Technical Explanation

A band-pass filter (BPF) is a frequency-selective circuit that allows a specific range of frequencies to pass while blocking those outside this range. Defined by its lower and upper cutoff frequencies (typically at the -3 dB points), it can be active (with amplification) or passive (without). BPFs are essential in applications like speaker crossovers, radio tuners, and instrumentation systems, where frequency isolation and channel separation are critical.