Band-pass filters are specified by either two cutoffs or center frequency plus bandwidth

Evidence

We can observe in Figure 3–3 that the low-pass filter has 0 dB gain in the frequencies below the cutoff frequency (fco) and begins attenuating sound at the cutoff frequency, whereas the high-pass filter does the reverse. The band-pass filter (illustrated second from the right in Figure 3–3), can be specified in one of two ways: using two cutoff-frequencies — the lowfrequency and the high-frequency cutoff or the center frequency (fc) and bandwidth (BW). — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 429

Categorization

• DEFINE: Clarifies filter specifications — cutoff frequencies vs center frequency plus bandwidth — foundational vocabulary for noise generation in psychoacoustics.