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Reducing reflected contributions to ear-canal distortion product otoacoustic emissions in humansa)
a)Portions of this work were presented at the 29th Midwinter Meeting of the Association for Research in Otolaryngology, Baltimore, MD, February 2006.
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10.1121/1.2200048
/content/asa/journal/jasa/119/6/10.1121/1.2200048
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/6/10.1121/1.2200048
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

DPOAE level (dB SPL) as a function of (kHz) for a single subject for the -octave interval surrounding . Increasing line thickness indicates increasing , which ranged from SPL in increments. Each trace has been offset by successive increments to aid in visualization.

Image of FIG. 2.
FIG. 2.

The number of subjects screened in each frequency interval who produced DPOAE fine structure, which was defined as a maxima-to-minima ratio in one cycle of fine structure when SPL. The open bars represent the number of subjects evaluated and the cross-hatched region indicates the number who had DPOAE fine structure.

Image of FIG. 3.
FIG. 3.

DPOAE level (dB SPL) as a function of (kHz) for all subjects screened in both the 2- and intervals. Data for are shown in the first and third columns. Data for are shown in the second and fourth columns. Adjacent panels within a row represent data from the same subject, as identified in the upper-right corner of each panel. All data were collected with SPL in the absence of a suppressor tone.

Image of FIG. 4.
FIG. 4.

Inverse fast Fourier transforms (IFFTs) of the data shown in Fig. 3. The data are plotted as amplitude (relative units) as a function of time (ms). The layout is the same as in Fig. 3. Data for are shown in the first and third columns, are shown in the second and fourth columns, adjacent panels within a row are for the same subject.

Image of FIG. 5.
FIG. 5.

Summary of the analyses completed on the data. The data shown are for a single subject (C110), with SPL, and . DPOAE responses are shown in the left column along with the DC component (overall DPOAE level) from the discrete cosine transform (DCT) of the data (see the text for details regarding the DCT). The level of the higher “frequency” components of the DCT for the same data are shown in the middle column, and an IFFT of the data in the left column is shown in the right column. In each row, the response in the control condition (no ) along with results for two suppressor levels (indicated by value) is shown. Suppressor level increases from top to bottom.

Image of FIG. 6.
FIG. 6.

The left column plots a summary of the discrete cosine transform (DCT) of the data shown in Fig. 5. The right column plots similar data from a different subject (C117) for the interval surrounding when SPL. The top row plots the DC component level, which corresponds to the overall DPOAE level, as a function of suppressor condition . The bottom row represents the rms level of the higher “frequency” components of the DCT (see middle column, Fig. 5) and represents the magnitude of the fine structure in the DPOAE response for the various suppressor conditions. See the text for additional information regarding the derivation of these data.

Image of FIG. 7.
FIG. 7.

Summary of the mean ( standard deviation) DCT results across the 4 subjects. The left column plots data for the interval, with data for the interval shown in the right column. Data for , 40, 60, and SPL are shown, as indicated. For each , the upper panel plots DC level (dB SPL) as a function of suppressor condition and the lower panel plots the rms level of the fine structure. See the text for additional information regarding the derivation of these data.

Image of FIG. 8.
FIG. 8.

The relationship between suppressor level and in individual subjects. Data for the interval are shown in the left column and data for the interval are shown in the right column. Each row represents an alternate view of suppressor level . The top row plots as a function of . The middle row plots absolute suppressor level (dB SPL) as a function of , with the bottom row plotting suppressor level re: as a function of . The solid slanting lines represent linear fits to these data; the fits are shown as insets in each panel. The values associated with these fits are also shown in each panel. The filled circles in the right column highlight data from an individual subject, as indicated in the text.

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/content/asa/journal/jasa/119/6/10.1121/1.2200048
2006-06-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reducing reflected contributions to ear-canal distortion product otoacoustic emissions in humansa)
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/6/10.1121/1.2200048
10.1121/1.2200048
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