![]() ![]() To make things simpler, the Selectone ST-20B supports eight discrete carrier frequencies, namely 2632, 2718, 2868, 3023, 3196, 3339, 3495, and 3729 Hz, which they claim to be "the most commonly used inversion formats". ![]() We would need to resample the audio at a rate of 8600 Hz and multiply every other sample by −1 to get intelligible audio. But speech will nevertheless be much more intelligible than in the original scrambled signal.įor example, consider a scrambled piece of audio that seems to have its highest frequency components at 4300 Hz. Slight distortion will still remain, unless the chosen Nyquist frequency perfectly matches the inverted zero frequency of the signal, or the "inversion carrier" as Selectone calls it. Print $outf pack "s", (unpack "s", $sample) * $sign īecause the whole spectrum is inverted, a sampling rate has to be chosen to (approximately) match the signal bandwidth. # Simply multiply every other sample by -1 ![]() # Using SoX for resampling and decoding/encoding WAV headers You should probably try that one instead these old scripts will be preserved here though. Update 09/2017: I've later released a simple descrambler tool called deinvert. ![]()
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