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Effect of spectral change enhancement for the hearing impaired using parameter values selected with a genetic algorithm
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10.1121/1.4799807
/content/asa/journal/jasa/133/5/10.1121/1.4799807
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/5/10.1121/1.4799807

Figures

Image of FIG. 1.
FIG. 1.

The top panel shows SRTs for unprocessed stimuli for each subject as a function of the mean audiometric threshold of the subject over the frequency range 0.25 to 8 kHz. Squares connected by a solid line show SRTs with the SSN masker, and circles connected by a dotted line show SRTs with the TTS masker. The bottom panel shows the same data but re-ordered according to the average audiometric threshold for frequencies from 0.5 to 4 kHz (the BEA). The filled circle and square represents cases where two subjects had the same SRTs and the same mean audiometric threshold.

Image of FIG. 2.
FIG. 2.

The top panel shows mean percent correct identification of key words for each condition across nine subjects for whom no adjustment to the SMR was made. The bottom panel shows corresponding mean scores across three subjects for whom the SMR was adjusted (3, 8, and 10 for the SSN masker and 4, 5, and 8 for the TTS masker). SSN and TTS represent masker types, L represents low SMRs, and H represents high SMRs. Open and shaded bars show scores for unprocessed and SCE processed stimuli, respectively. Error bars indicate the standard error of the mean.

Image of FIG. 3.
FIG. 3.

Benefit scores for each subject as a function of the BEA. The top panel is for the SSN masker, and the bottom panel is for the TTS masker. The squares connected by solid lines are for SMR_H, and the circles connected by dotted lines are for SMR_L.

Image of FIG. 4.
FIG. 4.

Benefit scores for each subject for the SSN masker at the low SMR plotted as a function of value.

Image of FIG. 5.
FIG. 5.

The selected value for the SSN masker for each subject as a function of the BEA.

Image of FIG. 6.
FIG. 6.

The benefit scores for the current study plotted against those for the previous study ( ) for eight subjects who participated in both studies. The parameter values were fixed across subjects in the previous study, and two sets of parameter values were tested, P1 (bottom panel) and P2 (top panel). Parameter values were: P1 [, , , ] and P2 [, , , ]. The left panels are for the SSN masker and the right panels are for the TTS masker. In each panel, open squares and circles represent benefit scores for the low and high SMRs, respectively.

Tables

Generic image for table
TABLE I.

Age (years), audiometric thresholds (dB HL) of the test ear, and the mean threshold in dB HL between 0.25 and 8 kHz for each subject. Thresholds were measured with a final step size of 5 dB.

Generic image for table
TABLE II.

Minimum and maximum values and step sizes of the processing parameters used in the GA.

Generic image for table
TABLE III.

The “best” parameter values selected for each subject with the GA. The bottom two rows show the two sets of parameter values, P1 and P2, used by .

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/content/asa/journal/jasa/133/5/10.1121/1.4799807
2013-05-06
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of spectral change enhancement for the hearing impaired using parameter values selected with a genetic algorithm
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/5/10.1121/1.4799807
10.1121/1.4799807
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