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Inter Symbol Interference (ISI) / Equalization in Digital Signal Processing

What I understand, that the equalizer is a digital filter, that should be applied after receiver part. Is it right? And it reduces the ISI. A zero-forcing equalizer reduces the ISI complete. … But I can't find more detailed information about how the equalizer reduces the ISI. What is a principle of this type of the digital filter/ equalizer? What is mean in this picture? …
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