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https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Book%3A_Electrical_Engineering_(Johnson)/4%3A_Frequency_Domain/4.10%3A_Modeling_the_Speech_Signal
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https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Book%3A_Electrical_Engineering_(Johnson)/4%3A_Frequency_Domain/4.10%3A_Modeling_the_Speech_Signal