While the auditory system can sense vibration to about 20 Hz, tactile sensitivity extends that range to about 0.4 Hz. A proposed method for full-range reproduction includes haptic reproduction. Playback is achieved through headphones and a calibrated motion platform. The absolute magnitude and frequency response of the tactile portion must be considered with the same attention that is devoted to sound in order to produce a compelling experience. Even though the initial evaluation of the system suggested that the haptic portion might not be important, when it was turned off, something was clearly missing. Reproduction lacked presence.
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