In the frequency response plot, the amplitude ratio of output to input of a filter is plotted against frequency, showing transmission only within an intermediate frequency band between lower cutoff $f_1$ and upper cutoff $f_2$. What is the type of filter?
- Filter Frequency Response Characteristics:
- Band-pass filter passes signals within a designated continuous frequency band between a lower cutoff frequency ($f_1$) and an upper cutoff frequency ($f_2$), while heavily attenuating frequencies below $f_1$ and above $f_2$.
- Other Filters:
- Low-pass filter: Passes all frequencies from 0 to cutoff frequency $f_c$.
- High-pass filter: Passes frequencies above cutoff frequency $f_c$.
- Notch (Band-stop) filter: Rejects a narrow band while passing all others.
- Conclusion: Band pass filter (Option 3).
Correct option: (3) Band pass filter