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Source of level dependent minima in rabbit distortion product otoacoustic emissions
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10.1121/1.3003078
/content/asa/journal/jasa/124/6/10.1121/1.3003078
http://aip.metastore.ingenta.com/content/asa/journal/jasa/124/6/10.1121/1.3003078
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The nonlinearities and are plotted in the top lefthand side, and the same nonlinearites, except with linear output for negative signal polarities, are shown in the bottom lefthand side. On the righthand side are the nonlinearity in the top and that same function except that now it has been broken up so that only one polarity of the signal is clipped. For all of these I/O functions both the function and its first derivative are continuous.

Image of FIG. 2.
FIG. 2.

Graphs of the output of three DPs as a function of the amplitude of the two input tones. The input is , where the ’s are the tone amplitudes and the ’s are the angular frequencies. Here . On the lefthand side are DPs for the single-polarity I/O function, if and linear otherwise, and in the middle for the single-polarity I/O function, if and linear otherwise; and on the righthand side the two-polarity clipper . The middle and the righthand sides show nulls in the three DPs plotted. The null in the DP is near the local maximum of the DP and the null in the DP is associated with a maximum in the DP.

Image of FIG. 3.
FIG. 3.

Contour graphs of the level output for the nonlinearity as a function of the two levels and . The lines of nulling parallel to each of the input level axes are evident.

Image of FIG. 4.
FIG. 4.

Contour graphs of the level output for the nonlinearity as a function of the two levels and . The lines of nulling parallel to each of the input level axes are evident.

Image of FIG. 5.
FIG. 5.

DPOAE data for the level and phase (given by the direction of the arrows) in the top panel and the phase alone in the bottom panel as a function of the two input levels and . The lines of nulling parallel to the and axes are evident in the level as is an abrupt phase discontinuity at about SPL and also SPL. Then, there is a second less abrupt phase change in the mid- SPL region. Note that the phase in the figures is expressed in units of cycles. In the bottom panel, the phase has been discretized into four contour levels. The data density in this figure and the other data figures is between adjacent levels. Here .

Image of FIG. 6.
FIG. 6.

DPOAE level and phase as functions of the two input levels and . The lines of nulling and phase discontinuities parallel to the level axes are evident or hinted across a broad frequency range . Here . The phase has been discretized into four contour levels in order to emphasize the phase transition patterns.

Image of FIG. 7.
FIG. 7.

Shown here are the DPOAE level and phase (direction of arrows) measured at the same time as the DPOAE data in Fig. 6.

Image of FIG. 8.
FIG. 8.

Shown here are the DPOAE level data measured at the same time as the DPOAE data in Fig. 6.

Image of FIG. 9.
FIG. 9.

The amplitudes of , , , and DPOAEs as functions of and show a general correlation between a null spot and a relative maximum of the next highest order. The amplitude of the maximum of the higher order is approximately at the level of the lower order just before the null spot. . The phase at the maxima flips by between adjacent orders. Notice that the range of input levels varies from one panel to the next.

Image of FIG. 10.
FIG. 10.

Shown here are the DPOAE level data measured in a human with the same apparatus as the rabbit measurements. The DPOAE phases are depicted by the directions of the arrows. .

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/content/asa/journal/jasa/124/6/10.1121/1.3003078
2008-12-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Source of level dependent minima in rabbit distortion product otoacoustic emissions
http://aip.metastore.ingenta.com/content/asa/journal/jasa/124/6/10.1121/1.3003078
10.1121/1.3003078
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