An auditory illusion, the glissando illusion is created when a sound with a fixed pitch, such as an oboe, played with a sine wave gliding up and down in pitch, are both switched back and forth between stereo channels. The effect is that the oboe is heard as switching between channels while the sine wave is heard as continuous and balanced between both ears An auditory illusion is an illusion of hearing (sense), the sound equivalent of an optical illusion: the listener hears either sounds which are not present in the stimulus, or impossible sounds. ... Jump to: navigation, search Modern Oboe The oboe is a musical instrument of the woodwind double reed family. ... In trigonometry, an ideal sine wave is a waveform whose graph is identical to the generalized sine function y = Asin[ω(x − α)] + C, where A is the amplitude, ω is the angular frequency (2π/P where P is the wavelength), α is the phase shift, and C is the... In popular usage, stereo generally to dual-channel sound recording and sound reproduction – sound that contains data for more than one speaker simultaneously. ...
An auditory illusion is an illusion of hearing (sense), the
sound equivalent of an optical illusion: the listener hears either sounds which are not present in the stimulus, or "impossible" sounds.
In short, audio illusions highlight areas where the human ear and brain, as organic, makeshift tools, differ from perfect audio receptors (for better or for worse).
To experience the glissandoillusion, you should be seated in front of two stereophonically separated loudspeakers, with one to your left and the other to your right, as in Figure 1.
The switching rate between the glissando and oboe tone was held constant at 238 ms, and the duration of one cycle of the glissando was held constant at 2.5 sec.
Perhaps the most remarkable aspect of this illusion is that, although the portions of the glissando are alternating abruptly between widely different spatial positions, it is perceived as though coming from a single source that moves around in space in accordance with it pitch characteristics.
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