Transcription of FITTING TIPS How Do Vents Affect Hearing Aid …
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FITTING TIPS How Do Vents Affect Hearing Aid …
2006 How Do Vents Affect Hearing Aid performance ?A tutorial on venting, and its impact on the occlusion effect FITTING TIPSS ounds Leaving the EarLow frequency output. Theeffect of venting on the acoustic output of ahearing aid is well documented. Figure 2shows the effect of vent diameter and ventlength on the output frequency response. Astraight line at 0 would suggest no changeto the output relative to measurement madewith an occluding earmold; data above 0 suggest a gain increase (from resonance)while that below 0 suggest gain reductionwith the specific vent dimension (lengthand diameter). The solid line shows the result of a 6 mm-long vent, while the dotted line shows that ofa 22 mm-long vent. For both vent lengths,one sees more low-frequency gain reductionas the vent diameter increases. For example,one sees that the output at 200 Hz is reducedby 7-8 dB with a 1 mm vent diameter, but asmuch as 28 dB reduction with a 3 mm ventdiameter.
34 hearingreview.com FEBRUARY 2006 How Do Vents Affect Hearing Aid Performance? A tutorial on venting, and its impact on the occlusion effect FITTING TIPS Sounds Leaving the Ear
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