scholarly journals Effects of dividing frequency in filtering for dichotic presentation to reduce masking to a consonant by the preceding vowel

2006 ◽  
Vol 27 (4) ◽  
pp. 245-247
Author(s):  
Atsunobu Murase ◽  
Shuichi Sakamoto ◽  
Yôiti Suzuki ◽  
Tetsuaki Kawase ◽  
Toshimitsu Kobayashi
Keyword(s):  
Dichotic Presentation

scholarly journals Effect of dichotic presentation on sound localization by the elderly

2005 ◽  
Vol 48 (6) ◽  
pp. 633-643
Author(s):  
Atsunobu Murase ◽  
Fumie Nakajima ◽  
Shuichi Sakamoto ◽  
Yôiti Suzuki ◽  
Tetsuaki Kawase ◽  
...  
Keyword(s):  
Sound Localization ◽  
The Elderly ◽  
Dichotic Presentation

A Comparison of the Effects of Differences in Temporal Gating and Ear of Presentation on Profile Discrimination

Perception ◽  
10.1068/p3124 ◽  
2002 ◽  
Vol 31 (11) ◽  
pp. 1395-1402
Author(s):  
Nicholas I Hill ◽  
Peter J Bailey
Keyword(s):  
Spatial Location ◽  
Target Component ◽  
Frequency Components ◽  
Dichotic Presentation

The aim of the study was to examine the effects of differences in temporal gating and ear of presentation (both separately and in combination) on listeners' ability to detect an increment in the level of a 1 kHz component (the target) relative to that of four spectrally flanking components. The flanking components were always presented to the listeners' right ear, while the target component was either presented to the same ear (monaural presentation) or to the left ear (dichotic presentation). Similarly, the target and flanking components were either gated on and off at the same time (synchronous presentation), or else the target component began 100 ms before and terminated 100 ms after the four flanking components (asynchronous presentation). On average, thresholds were lowest in the synchronous, monaural condition, and highest in the two asynchronous conditions. Ear differences alone did result in elevated thresholds for most listeners. However, combining differences in gating and ear of presentation produced thresholds that were indistinguishable from those obtained when gating differences alone were employed. These results are consistent with the suggestion that differences in temporal gating lead to more complete segregation of concurrent frequency components than differences in spatial location.

Enhancing System Safety with 3-D Audio Displays

1997 ◽  
Vol 41 (2) ◽  
pp. 868-872 ◽  
Author(s):  
Ellen C. Haas ◽  
Charles Gainer ◽  
Dennis Wightman ◽  
Michael Couch ◽  
Russell Shilling
Keyword(s):  
Presentation Mode ◽  
Identification Task ◽  
System Safety ◽  
Multivariate Statistical ◽  
Radio Communications ◽  
Significant Difference ◽  
Helicopter Pilots ◽  
Safety Consideration ◽  
Dichotic Presentation ◽  
Important System

The enhancement of multiple radio communications can be an important system safety consideration. This study was conducted to determine how accurately helicopter pilots could process radio communications information in a simulated cockpit environment when the messages were presented under different modes (diotic, dichotic and 3-D audio). The dependent variable was the total number of points scored in the radio communications identification task. Subjects were 11 certified U.S. Army AH-64 pilots between the ages of 18 and 35 who possessed hearing and visual acuity within thresholds acceptable to the U.S. Army (U.S. Army, 1989). Multivariate statistical analysis indicated that presentation mode was significant. Pilots scored the greatest number of points in the identification task while using 3-D audio, fewer with dichotic presentation, and the least with diotic presentation. There was a statistically significant difference between the 3-D and the diotic presentation. The data imply that 3-D audio provides an effective mode of message presentation in systems with multiple radio communications.

Repetition effects in dichotic presentation.

1972 ◽  
Vol 92 (2) ◽  
pp. 220-224 ◽  
Author(s):  
Wayne H. Bartz
Keyword(s):  
Repetition Effects ◽  
Dichotic Presentation

Spectral Splitting of Speech by Wavelet Packets to Shrink Simultaneous Masking

2011 ◽  
Vol 403-408 ◽  
pp. 970-975
Author(s):  
P.A. Dhulekar ◽  
S.L. Nalbalwar ◽  
J.J. Chopade
Keyword(s):  
Spectral Analysis ◽  
Speech Processing ◽  
Speech Signal ◽  
Auditory Perception ◽  
Filter Bank ◽  
Wavelet Packets ◽  
Decomposition Level ◽  
Analysis Strategies ◽  
Spectral Splitting ◽  
Dichotic Presentation

Simultaneous masking is when a sound is made inaudible by a masker, a noise or unwanted sound of the same duration as the original sound. An innovative approach is investigated for speech processing in cochlea. Differently from the traditional filter-bank spectral analysis strategies, the proposed method analyses the speech signal by means of the wavelet packets. Splitting the speech signal by filtering and down sampling at each decomposition level, using wavelet packets with different wavelet functions, helps to shrink the effect of simultaneous masking. The performance of the proposed method is experimentally evaluated with vowel-consonant-vowel -syllables for fifteen English consonants. The dichotic presentation of processed speech signals effectively reduces the simultaneous masking through which it improves auditory perception.

Response Organization in Attention Control and a Perceptual Serial Position Effect

1972 ◽  
Vol 24 (3) ◽  
pp. 340-351 ◽  
Author(s):  
Geoffrey Underwood
Keyword(s):  
Serial Position ◽  
Short Term Memory ◽  
Serial Position Effect ◽  
Position Effect ◽  
Attention Control ◽  
Overt Response ◽  
Detection Rates ◽  
Response Organization ◽  
Dichotic Presentation ◽  
Serial Position Curves

To determine the influence of response organization factors in selective attention, a comparison was made between the shadowing and monitoring techniques of attention control and a one-trial serial recall technique in which subjects were instructed to remember one message (attended channel) of a dichotic presentation. Detections of semantic targets in the attended and unattended messages from the remembering condition were quantitatively similar to those from the monitoring condition. This suggests that the low detection rates in the unattended message when subjects are shadowing are a function of the higher processing demands of overt response organization required by this task. A serial position effect was also in evidence: the detection probability was enhanced if the target was positioned towards either end of the serial presentation of 16 items. The primacy observed here, common to all three attention control conditions, indicates more efficient perceptual processing and subsequent categorizing of end items than of central, embedded items. The hypothesis is offered that the principles governing the present primacy effects may also underlie primacy in serial position curves of short-term memory studies.

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