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Shepard tone

A Shepard tone is a sound consisting of a superposition of tones separated by octaves. An auditory illusion can be constructed by sweeping the frequency of a complex tone up an octave while passing the tone through a wide bandpass filter. The tone appears to rise continuously in pitch, yet return to its starting note.



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... Teskilan[?] (MIT) Jandarma Istihbarat ve Terorle Mucadete[?] (JITEM) United Kingdom Department of Naval Intelligence Government Communications Headquarters ...

 
 
 
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