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Hi-pass filters: atone, atonex, mvchpf
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Low-pass filters: tone, tonex
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Biquad filters: biquad and biquada.
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Butterworth filters: butterbp, butterbr, butterhp, butterlp (which are also called butbp, butbr, buthp, butlp)
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General filters: clfilt
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Variant FIR lowpass filter: median, mediank