Which filter passes frequencies higher than the programmed frequency while blocking lower frequencies?

Which filter passes frequencies higher than the programmed frequency while blocking lower frequencies?

• A. High Pass Filter
• B. Low Pass Filter
• C. Band Pass Filter
• D. Notch Filter

Answer: (A)

A high-pass filter is designed to let frequencies above a chosen cutoff pass through while attenuating those below it. When the programmed frequency acts as that cutoff, all higher-frequency components are transmitted with little attenuation and lower-frequency content is reduced. This behavior matches the description in the question, since you’re allowing higher frequencies to pass and blocking lower ones. In electrophysiology, this helps remove slow baseline drift and DC offsets so fast events like spikes or high-frequency activity remain clear. The other filters do the opposite or target specific ranges: a low-pass filter passes the slow, low-frequency content and blocks high frequencies; a band-pass filter passes a defined range; a notch filter removes a narrow frequency band.

A high-pass filter is designed to let frequencies above a chosen cutoff pass through while attenuating those below it. When the programmed frequency acts as that cutoff, all higher-frequency components are transmitted with little attenuation and lower-frequency content is reduced. This behavior matches the description in the question, since you’re allowing higher frequencies to pass and blocking lower ones. In electrophysiology, this helps remove slow baseline drift and DC offsets so fast events like spikes or high-frequency activity remain clear. The other filters do the opposite or target specific ranges: a low-pass filter passes the slow, low-frequency content and blocks high frequencies; a band-pass filter passes a defined range; a notch filter removes a narrow frequency band.