Question: Frequency inverters have been used for many years for speech scrambling. Indeed, a voice signal x (n) becomes unintelligible if we invert its spectrum as

Frequency inverters have been used for many years for speech scrambling. Indeed, a voice signal x (n) becomes unintelligible if we invert its spectrum as shown in figure(a) Determine how frequency inversion can be performed in the time domain.(b) Design aun-scramble. X(w) (a) Yiw) 2 (b)

X(w) (a) Yiw) 2 (b)

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