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Time-domain scrambling of audio signals - File Exchange ...
https://www.mathworks.com/matlabcentral/fileexchange/29396-time-domain-scrambling-of-audio-signals
These routines scramble an audio file by moving around short, overlapping windows within a local window. They can be used to create new versions of existing recordings that preserve the spectral content over longer …
Frequency inversion audio scrambling - MATLAB & Simulink
https://www.mathworks.com/matlabcentral/answers/232699-frequency-inversion-audio-scrambling
1. read the audio file into matlab 2. normalize the audio data 3. transpose to match the audio array 4. fft 5. multiply with a vector of alternating 1,-1,1,-1,1,-1.... 6. real (ifft ()) 7. normalize 8. play using soundsc ()
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 ...
GitHub - danielsaul/audio-descrambler-scenario: Scenario …
https://github.com/danielsaul/audio-descrambler-scenario
Work out how the scrambling is done by recording your own voice and analysing the scrambled message produced by the scrambling program “The scrambler file” written in the protected Matlab code. Design and build one digital and one analogue real-time audio descrambler to work out what the secret message is. Having Fun Authors Daniel Saul
Time domain scrambling of audio signals in matlab ...
http://freesourcecode.net/matlabprojects/66794/time-domain-scrambling-of-audio-signals-in-matlab
Matlab Audio Processing Examples - Columbia University
https://www.ee.columbia.edu/~dpwe/resources/matlab/
Gammmatone (auditory) Spectrogram - another specgram ()-like function, this time for calculating time-frequency surfaces based on the gammatone approximations to auditory filters. Time-domain audio scrambling - removes some of the identifiability of audio signals by shuffling overlapping time windows.
A Simple Voice Scrambler using the TMS320C6x DSK …
https://www.ti.com/sc/docs/general/dsp/festproceedings/fest2000/scrambler.pdf
The scrambling method used is commonly referred to as frequency inversion. It basically takes an audio range (represented by the band 0.3 – 3 kHz) and “folds” it about a carrier signal. The frequency inversion is achieved by multiplying (modulating) the audio input by a carrier signal,
GitHub - hassifow/real-time-audio-descrambler ...
https://github.com/hassifow/real-time-audio-descrambler
Work out how the scrambling is done by recording your own voice and analysing the scrambled message produced by the scrambling program “The scrambler file” written in the protected Matlab code. Design and build a digital real-time audio descrambler to work out what the secret message is using MSP432 and C.
How would I spectrally rotate/invert an audio signal ...
https://dsp.stackexchange.com/questions/69495/how-would-i-spectrally-rotate-invert-an-audio-signal-matlab-or-python
So this is the OP's case with an audio file representing a real signal. The OP wants to rotate the spectrum such that f = 0 is translated to …
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