Changing state and the irrelevant sound effect
Keywords:Acoustic noise, Information analysis, Speech, Time varying systems, White noise, Amplitude envelope, Base stimulus, Sinewave speech
AbstractThe definition of changing relating to the dynamic spectral and temporal properties of the irrelevant stimuli are studied. This envelope stimulus was constructed by outlining the amplitude envelope of the base passage and then replacing the time-varying frequency information with a pure tone or white noise. The effect of backward speech and sinewave speech modeled after the base stimulus was tested. A sinewave speech stimulus was constructed by performing an LPC re-synthesis on the base stimulus replacing the noise in speech formants with sinewaves at the center frequency of the formant. It was observed that a change in amplitude by itself gives little or no information about the content of the stimulus and, therefore, does not attract much in the way of attentional resources.
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