Why is pre-emphasis (i.e. passing the speech signal through a first order high pass filter) required in speech processing and how does it work? - Quora
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Gain in dB of the Pre-emphasis filter for various cases: solid-analog... | Download Scientific Diagram
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The De-Emphasis filter function issue - Q&A - SigmaDSP Processors and SigmaStudio Development Tool - EngineerZone
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