奥迪康PK峰力

suifeng8

引用第155楼林照跃于2012-06-07 16:09发表的  :
Extended Bandwidth and Speech Perception
Pittman1 noted that, upon high school graduation, the average graduate commands some 60,000 words. Unfortunately, children with hearing impairment develop vocabulary in a delayed fashion, apparently related to their degree of hearing loss. Pittman evaluated 50 children between 8 and 10 years of age. A total of 36 of the children had normal hearing and 14 had moderate-to-severe hearing loss. Her study compared word-learning rates when children were exposed to restricted (4 kHz) versus extended high-frequency (9 kHz) bandwidths. Regardless of hearing status, Pittman found all children learned words significantly faster while using extended high-frequency bandwidths. The research noted that restricted hearing aid bandwidths may provide an ambiguous signal; children may require more exposures to the primary signal to perceive the subtle acoustic elements required for word-learning.

Stelmachowicz et al4 in 2001 investigated stimulus bandwidth as it relates to the perception of the phoneme /s/ across 80 subjects, including normal-hearing and hearing-impaired subjects. The speech stimuli were created by male, female, and child talkers. Speech stimuli were low-pass filtered at five settings between 2 kHz and 9 kHz. Although subjects' perceptual performance for the male speaker was maximal at a bandwidth of 5 kHz, mean performance for the female speaker improved until the widest bandwidth (9 kHz) was reached. Likewise, for the child speaker, the subjects' performance increased steadily as the bandwidth was increased. The authors stated aided audibility for high-frequency sounds is a problem for children with mild-to-moderate hearing loss, as well as for children with severe-to-profound hearing loss.

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请看作者，别的不用看了。

注意一下，这篇文章的研究方法，是比较频宽5000Hz和10000Hz的区别，他怎么不选取7000-8000Hz与10000Hz的对比呢？

要知道，那么小功率的机器（达到10000Hz频宽的助听器都是功率不大的），绝大多数厂家都能做到7000-8000Hz。

suifeng8

引用第154楼林照跃于2012-06-07 15:54发表的  :
Conclusion: These results suggest that children with HL may benefit from extended high-frequency amplification when learning new words and for other long-term auditory processes.
http://jslhr.highwire.org/cgi/content/abstract/51/3/785

第一、这篇没有全文，不知道作者把一个样本的频宽限制了，限制在多少？不知道。
第二、结论里的“may”很关键，may翻译过来是“可能”，这里是说可能有帮助，也可能没帮助。

对于这篇文章的全文，我比较好奇。

suifeng8

引用第161楼厦门益耳听力于2012-06-07 17:07发表的  :


我个人觉得，如果正常补偿可以的话，可以不用开。问题是很多人正常补偿的话高频仍补偿不好，此时移频的好处就显现出来了。而且这类人很多。我注意到你的高频损失只有7、80时，此时可能不用开移频 。其实开也是可以的，但是记住，没有一种验配方式是适用于所有人的，所以要结合患者的感受进行调节。即使开的话，也要注意调节，正如你所说，移频如果使用不当的话，会给患者的语言信息带来较大的伤害。就象一个工具在好木匠手里可以做出艺术品，在坏木匠手中可能只会做出败笔一样。 一个好验配师的重要性，在这时就可以体现出来了。但总体而言，这个功能为高频损失患者带来更多可用信息。


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益耳听力的评论非常客观，赞~~~

林照跃

这里说明一下，这一篇文章的作者虽然是奥迪康的，但他是引用其他机构的结论。如果要原文的话，我也是可以找出来的。

林照跃

当然限制了，但你原先那篇文章其实也不是变相限制了么？
现在最主要的问题是奥迪康的宽频助听器对高频损失可以补偿到9000HZ（频率再上去就急剧下降了，所以实际的9500HZ一般情况下能够保证9000HZ），这样的频宽足够语音学习了，补偿的好的话，甚至不需要任何专门的训练。
当然，你可以说9000HZ还不够。

suifeng8

注意一下，这篇文章的研究方法，是比较频宽5000Hz和10000Hz的区别，他怎么不选取7000-8000Hz与10000Hz的对比呢？

要知道，那么小功率的机器（达到10000Hz频宽的助听器都是功率不大的），绝大多数厂家都能做到7000-8000Hz。

suifeng8

我们需要看第三方的研究报告，等你拿出第三方研究报告吧。

林照跃

这样说，我反而不想找了。
能做到7000-8000HZ，这是大多数厂家能做到的。但这篇文章要对比的不是“S”等音的识别，因为这已经不是问题了，而是全面性能的比较。

suifeng8

你慢慢找吧，我不说了，等你找到，我再说。

林照跃

原文下面引用就有，但我要说的是，作为业内人士，同样也要看到其他公司的优点，而不能只看到自己的优点。如果作为验配师，那就是对用户的不负责任；如果作为峰力公司的职工，那倒情有可原。