Abstract:
:Real-ear measurements using the modified pressure method with concurrent (real-time) equalization can be inaccurate, when amplified sound leaks out of the ear canal and reaches the reference microphone. In such situations the reference microphone will detect an increased sound level and reduce the output of the loudspeaker to maintain the desired level. The risk of having errors due to leaks increases if digital feedback suppression (DFS) is used, thus achieving higher feedback-free gain levels. The following hypotheses were tested: a) using the concurrent equalization method for fitting hearing instruments with DFS may result in underestimated real-ear insertion gain (especially when using open fittings) and b) as the benefit of the DFS system increases, this error also increases. Real-ear measurements were carried out in twenty-one subjects using the modified pressure method with stored equalization as well as with concurrent equalization. The results of the study supports both hypotheses. As a consequence it is recommended to use a stored equalization method for real-ear measurements of hearing instruments with DFS and open fitting.
journal_name
Int J Audioljournal_title
International journal of audiologyauthors
Lantz J,Jensen OD,Haastrup A,Olsen SØdoi
10.1080/14992020601083313subject
Has Abstractpub_date
2007-01-01 00:00:00pages
11-6issue
1eissn
1499-2027issn
1708-8186pii
773171933journal_volume
46pub_type
杂志文章abstract:OBJECTIVE:Persistent tinnitus affects 10 to 15% of adults. Little is understood about why only a small percentage of patients become severely affected. Catastrophic thinking has been suggested as one potentially relevant factor that might influence a patient's coping behavior, and thus tinnitus habituation. The current...
journal_title:International journal of audiology
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