Informational masking of speech by time-varying competitors: Effects of frequency region and number of interfering formants

The Journal of the Acoustical Society of America
Brian Roberts, Robert J Summers

Abstract

This study explored the extent to which informational masking of speech depends on the frequency region and number of extraneous formants in an interferer. Target formants-monotonized three-formant (F1+F2+F3) analogues of natural sentences-were presented monaurally, with target ear assigned randomly on each trial. Interferers were presented contralaterally. In experiment 1, single-formant interferers were created using the time-reversed F2 frequency contour and constant amplitude, root-mean-square (RMS)-matched to F2. Interferer center frequency was matched to that of F1, F2, or F3, while maintaining the extent of formant-frequency variation (depth) on a log scale. Adding an interferer lowered intelligibility; the effect of frequency region was small and broadly tuned around F2. In experiment 2, interferers comprised either one formant (F1, the most intense) or all three, created using the time-reversed frequency contours of the corresponding targets and RMS-matched constant amplitudes. Interferer formant-frequency variation was scaled to 0%, 50%, or 100% of the original depth. Increasing the depth of formant-frequency variation and number of formants in the interferer had independent and additive effects. These findings sugges...Continue Reading

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Citations

Feb 4, 2019·The Journal of the Acoustical Society of America·Gerald KiddH Steven Colburn
Mar 3, 2020·The Journal of the Acoustical Society of America·Robert J Summers, Brian Roberts
Nov 4, 2020·The Journal of the Acoustical Society of America·Brian Roberts, Robert J Summers

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