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What is spectral inversion?
https://philosophy-question.com/library/lecture/read/376584-what-is-spectral-inversion#:~:text=Voice%20inversion%20works%20by%20inverting%20the%20audio%20spectrum,easily%20be%20recognized.%20What%20is%20voice%20inversion%20scrambler%3F
Spectrum-Inversion Audio Scrambling
http://cse-apps2.case.edu/panli/lib/exe/fetch.php?id=teaching%3Aece3443&cache=cache&media=signals_and_systems:spectrum_inversion.pdf
Spectrum-Inversion Audio Scrambling – scramble.m % % function y = scramble(x) % % x: 1 x N % y: 1 x N % % This function implements spectrum-inversion audio % scrambling. The input signal, x, is scrambled to % produce the output signal y. The scrambler also % functions as the descrambler; to recover x from y, % run scramble on y. It is assumed ...
algorithm - How to Spectrum-inverse a sampled audio …
https://stackoverflow.com/questions/3520557/how-to-spectrum-inverse-a-sampled-audio-signal
8 Mixing the signal by Fs/2 will swap high frequencies and low frequencies - think of rotating the spectrum around the unit circle by half a turn. You can achieve this rotation by multiplying every other sample by -1. Mixing by Fs/2 is equivalent to mixing by exp (j*pi*n). If x is the input and y the output,
What is spectral inversion?
https://philosophy-question.com/library/lecture/read/376584-what-is-spectral-inversion
Voice inversion works by inverting the audio spectrum at a set maximum frequency called the inversion carrier. Frequencies near this carrier will thus become frequencies near zero Hz, and vice versa. The resulting audio is unintelligible, though familiar sentences can easily be recognized. What is voice inversion scrambler?
Spectrum inversion bug transmitter | Endoacustica
https://www.endoacustica.com/spectrum-inversion-bug-transmitter.php
Radio bug with spectrum inversion audio encoding for secret audio transmissions. It eliminates the risk of external eavesdropping! This radio bug listening device is ideal for secret audio transmissions, suitable fore eliminating the risk of external interception thanks to its spectrum inversion transmission technology which allow the transmitter to be not audible by traditional …
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