band-pass filter

A band-pass filter is a device or system that allows only a specific range of frequencies to pass through while blocking frequencies outside that range. Think of it like a sieve that sorts particles by size; here, it sorts signals by their frequency. This is useful in many applications, such as audio engineering to isolate certain sounds, or in radio receivers to focus on a particular station while filtering out others. The filter's "band" refers to the range of frequencies it allows, defined by the lower and upper cutoff points, ensuring only desired signals are transmitted.