Which type of frequency-sensitive filter consists of series LC circuits across both input and output, with a parallel LC circuit in between?

The type of frequency-sensitive filter described is a band-pass filter. A band-pass filter allows signals within a certain frequency range to pass through while attenuating frequencies outside that range. In this design, the series LC circuits at both the input and output work to select and enhance specific frequencies, while the parallel LC circuit in between provides the necessary selective tuning.

The series LC circuits, which resonate at the desired frequency, work together with the parallel LC circuit to create a pathway for the target frequencies, resulting in the characteristic band-pass behavior. Specifically, the series components suppress low and high frequencies, while the parallel circuit enhances the targeted band of frequencies.

This configuration highlights the unique functioning of band-pass filters, making them essential in applications like radio communications and audio processing, where isolation of a specific frequency band is required.