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Bandwidth measured at half-power points (gain −3 dB, √2/2, or about 0.707 relative to peak) on a diagram showing magnitude transfer function versus frequency for a band-pass filter.

A medium-complexity example of a band-pass filter.

A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. It is the inverse of a band-stop filter.