Masking of complex sound--technical notes for realization of constant signal-noise-ratio.
Based on findings regarding unconscious semantic information-processing for meaningful visual stimuli, this paper describes a standardized procedure for the construction of constant signal to noise ratio for the masking of complex sounds. The proposed algorithm is derived from psychoacoustical laws concerning frequency and time-weighting of sound. Spectral characteristics are taken into account by mixing signal and white noise within frequency ranges defined through critical bandwidth ("narrow-band masking"). Furthermore, time-weighting is taken into account using sound-pressure patterns generated through low pass filters which follow the international specification DIN IEC 651 which provides specification for sound-level meters. Hardware and software circuits are described in detail. This proposal overcomes recognized lack of standardized methods in studies addressing unconscious semantic processing of auditory stimuli.
Ott
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Psychologisches Institut, Universität Bonn. ralf.ott@uni-bonn.de
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D000161:Acoustic Stimulation; D000465:Algorithms; D001307:Auditory Perception; D006801:Humans; D009622:Noise; D010470:Perceptual Masking; D011571:Psychoacoustics; D012660:Semantics; D012984:Software; D014473:Unconscious, Psychology