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notch filter

A type of bandstop filter that reduces a narrow range of frequencies. For example, a notch filter in a musical instrument amplifier may reduce frequencies in the range of 59 to 61 Hz, which is sufficient to eliminate any hum coming from the 60 Hz power line. See bandstop filter.

bandstop filter

An electronic circuit that accepts a signal and attenuates (reduces) certain frequencies. For example, it may be used to eliminate hum in a line. See bandpass filter and notch filter.

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