Objective: To investigate the changes of bone auditory thresholds variations in cholesteatoma middle ear surgery and its related factors and its related factors. Methods: 122 cases (122 ears) of unilateral cholesteato...Objective: To investigate the changes of bone auditory thresholds variations in cholesteatoma middle ear surgery and its related factors and its related factors. Methods: 122 cases (122 ears) of unilateral cholesteatoma otitis media were treated by mastoidectomy and/or tympanoplasty plus stage I tympanoplasty, and tragus cartilage ring-cartilage membrane (Referred to as cartilage group, 62 ears) and temporalis muscle fascia (Referred to as fascia group, 60 ears) were used as tympanic membrane grafts respectively. The changes of bone conduction hearing threshold were compared between the two groups before and 1, 3, 6 months and 1, 3 years after operation. And compare the difference in the incidence of ossicular chain fixation or necrosis, vestibular window or cochlear window dysfunction between the two groups of patients with increased (positive) and decreased (negative) bone conduction threshold before operation. Results: Compared with the healthy side, 95 ears of 122 ears in the two groups had higher bone conduction hearing threshold before operation. Among them, 48 ears were in cartilage group and 47 ears were in fascia group;In 72 ears (76.34%) of these cases, the bone conduction hearing threshold decreased after operation, and the difference between the two groups was statistically significant (P Conclusion: The improvement of bone conduction hearing threshold in patients with cholesteatoma otitis media is mainly related to the fixation or necrosis of ossicular chain and the dysfunction of two windows. The tragus cartilage ring-perichondrium tympanoplasty can not only reduce the air-bone conduction difference, but also reduce the bone conduction hearing threshold, which has the advantage of stable and lasting hearing improvement.展开更多
In order to apply speech recognition systems to actual circumstances such as inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-wri...In order to apply speech recognition systems to actual circumstances such as inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-writing is difficult, some countermeasure methods for surrounding noise are indispensable. In this study, a signal detection method to remove the noise for actual speech signals is proposed by using Bayesian estimation with the aid of bone-conducted speech. More specifically, by introducing Bayes’ theorem based on the observation of air-conducted speech contaminated by surrounding background noise, a new type of algorithm for noise removal is theoretically derived. In the proposed speech detection method, bone-conducted speech is utilized in order to obtain precise estimation for speech signals. The effectiveness of the proposed method is experimentally confirmed by applying it to air- and bone-conducted speeches measured in real environment under the existence of surrounding background noise.展开更多
Speech recognition systems have been applied to inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-writing is difficult. In these a...Speech recognition systems have been applied to inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-writing is difficult. In these actual circumstances, some countermeasure methods for surrounding noise are indispensable. In this study, a new method to remove the noise for actual speech signal was proposed by using Bayesian estimation with the aid of bone-conducted speech and fuzzy theory. More specifically, by introducing Bayes’ theorem based on the observation of air-conducted speech contaminated by surrounding background noise, a new type of algorithm for noise removal was theoretically derived. In the proposed noise suppression method, bone-conducted speech signal with the reduced high-frequency components was regarded as fuzzy observation data, and a stochastic model for the bone-conducted speech was derived by applying the probability measure of fuzzy events. The proposed method was applied to speech signals measured in real environment with low SNR, and better results were obtained than an algorithm based on observation of only air-conducted speech.展开更多
目的:分析耳科正常青年人气导和骨导短纯音诱发的听性脑干反应(ABR)的特性,比较气骨导短纯音ABR反应阈与纯音听阈的关系,探讨气骨导短纯音ABR反应阈对听阈评估的价值。方法:30例耳科正常青年人(男/女=14/16)分别进行纯音听阈测试、气导...目的:分析耳科正常青年人气导和骨导短纯音诱发的听性脑干反应(ABR)的特性,比较气骨导短纯音ABR反应阈与纯音听阈的关系,探讨气骨导短纯音ABR反应阈对听阈评估的价值。方法:30例耳科正常青年人(男/女=14/16)分别进行纯音听阈测试、气导和骨导短声及短纯音ABR测试。结果:1气导0.5、1、2、4 k Hz短纯音诱发ABR反应阈分别较对应频率气导纯音听阈高18.41±4.47、13.18±3.63、8.86±5.10、8.64±5.16 d B,骨导0.5、1、2、4 k Hz短纯音诱发ABR反应阈分别较对应频率骨导纯音听阈高14.31±3.98、10.45±4.54、6.82±4.24、8.18±4.77 d B。2气骨导各频率短纯音ABR反应阈的差值分别为5.55±3.42、3.86±4.86、1.36±5.60、1.59±6.05 d B,0.5、1 k Hz气骨导阈值间的差异有统计学意义(P<0.01),2、4k Hz气骨导阈值间的差异无统计学意义(P>0.05)。3气骨导短纯音ABR V波潜伏期均较短声ABR长,其差异有统计学意义(P<0.01),但两者I^V波间期的差异无统计学意义(P>0.05)。结论:气骨导短纯音ABR反应阈可以预测纯音听阈,气骨导短纯音ABR反应阈的差值有助于鉴别听力损失的类型。展开更多
文摘Objective: To investigate the changes of bone auditory thresholds variations in cholesteatoma middle ear surgery and its related factors and its related factors. Methods: 122 cases (122 ears) of unilateral cholesteatoma otitis media were treated by mastoidectomy and/or tympanoplasty plus stage I tympanoplasty, and tragus cartilage ring-cartilage membrane (Referred to as cartilage group, 62 ears) and temporalis muscle fascia (Referred to as fascia group, 60 ears) were used as tympanic membrane grafts respectively. The changes of bone conduction hearing threshold were compared between the two groups before and 1, 3, 6 months and 1, 3 years after operation. And compare the difference in the incidence of ossicular chain fixation or necrosis, vestibular window or cochlear window dysfunction between the two groups of patients with increased (positive) and decreased (negative) bone conduction threshold before operation. Results: Compared with the healthy side, 95 ears of 122 ears in the two groups had higher bone conduction hearing threshold before operation. Among them, 48 ears were in cartilage group and 47 ears were in fascia group;In 72 ears (76.34%) of these cases, the bone conduction hearing threshold decreased after operation, and the difference between the two groups was statistically significant (P Conclusion: The improvement of bone conduction hearing threshold in patients with cholesteatoma otitis media is mainly related to the fixation or necrosis of ossicular chain and the dysfunction of two windows. The tragus cartilage ring-perichondrium tympanoplasty can not only reduce the air-bone conduction difference, but also reduce the bone conduction hearing threshold, which has the advantage of stable and lasting hearing improvement.
文摘In order to apply speech recognition systems to actual circumstances such as inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-writing is difficult, some countermeasure methods for surrounding noise are indispensable. In this study, a signal detection method to remove the noise for actual speech signals is proposed by using Bayesian estimation with the aid of bone-conducted speech. More specifically, by introducing Bayes’ theorem based on the observation of air-conducted speech contaminated by surrounding background noise, a new type of algorithm for noise removal is theoretically derived. In the proposed speech detection method, bone-conducted speech is utilized in order to obtain precise estimation for speech signals. The effectiveness of the proposed method is experimentally confirmed by applying it to air- and bone-conducted speeches measured in real environment under the existence of surrounding background noise.
文摘Speech recognition systems have been applied to inspection and maintenance operations in industrial factories to recording and reporting routines at construction sites, etc. where hand-writing is difficult. In these actual circumstances, some countermeasure methods for surrounding noise are indispensable. In this study, a new method to remove the noise for actual speech signal was proposed by using Bayesian estimation with the aid of bone-conducted speech and fuzzy theory. More specifically, by introducing Bayes’ theorem based on the observation of air-conducted speech contaminated by surrounding background noise, a new type of algorithm for noise removal was theoretically derived. In the proposed noise suppression method, bone-conducted speech signal with the reduced high-frequency components was regarded as fuzzy observation data, and a stochastic model for the bone-conducted speech was derived by applying the probability measure of fuzzy events. The proposed method was applied to speech signals measured in real environment with low SNR, and better results were obtained than an algorithm based on observation of only air-conducted speech.
文摘目的:分析耳科正常青年人气导和骨导短纯音诱发的听性脑干反应(ABR)的特性,比较气骨导短纯音ABR反应阈与纯音听阈的关系,探讨气骨导短纯音ABR反应阈对听阈评估的价值。方法:30例耳科正常青年人(男/女=14/16)分别进行纯音听阈测试、气导和骨导短声及短纯音ABR测试。结果:1气导0.5、1、2、4 k Hz短纯音诱发ABR反应阈分别较对应频率气导纯音听阈高18.41±4.47、13.18±3.63、8.86±5.10、8.64±5.16 d B,骨导0.5、1、2、4 k Hz短纯音诱发ABR反应阈分别较对应频率骨导纯音听阈高14.31±3.98、10.45±4.54、6.82±4.24、8.18±4.77 d B。2气骨导各频率短纯音ABR反应阈的差值分别为5.55±3.42、3.86±4.86、1.36±5.60、1.59±6.05 d B,0.5、1 k Hz气骨导阈值间的差异有统计学意义(P<0.01),2、4k Hz气骨导阈值间的差异无统计学意义(P>0.05)。3气骨导短纯音ABR V波潜伏期均较短声ABR长,其差异有统计学意义(P<0.01),但两者I^V波间期的差异无统计学意义(P>0.05)。结论:气骨导短纯音ABR反应阈可以预测纯音听阈,气骨导短纯音ABR反应阈的差值有助于鉴别听力损失的类型。
