SP助听器用于重度极重度听力损失的高级助听技术知识.pptVIP

People with severe to profound HL are extremely dependent on high gain levels for audibility and speech understanding. SP aids with directionality require gain reductions (especially in the LF) – this compromises the user’s audibility and speech intelligibility. Trying to boost LF gain introduces: Internal feedback Microphone noise Wind noise Resricted HF audibility means that split directionality is not suitable TriState Noise Management works because of: Lower attenuation Speech shaped with Voice Finder Tristate Noise Management uses the VoiceFinder to determine if speech is present in the surroundings and at the same time evaluates in an eight-channel system how much modulation is present and at what level in each channel. This information is used to categorise the environment into one of three categories: Speech in Quiet, Speech in Noise or Noise Only. Based on the determined category, the amount of NoiseReduction is then determined – no attenuation in Speech in Quiet speech-weighted attenuation reduction in speech in noise Increased attenuation in Noise Only. Tristate Noise Management uses the VoiceFinder to determine if speech is present in the surroundings and at the same time evaluates in an eight-channel system how much modulation is present and at what level in each channel. This information is used to categorise the environment into one of three categories: Speech in Quiet, Speech in Noise or Noise Only. Based on the determined category, the amount of NoiseReduction is then determined – no attenuation in Speech in Quiet speech-weighted attenuation reduction in speech in noise Increased attenuation in Noise Only. 用于重度极重度听力损失的高级助听技术 Rom Mendel Oticon A/S, Denmark 重度-极重度听力损失 高阈值 动态范围窄 频率分辨率问题 不同群体差异 其它方面… 每位患者都需要专门的解决方案! 0 10 20 30 40 50 60 70 80 90 100 110 120 dB HL 125 250 500 1k 2k 4k 8k Middle Moderate Severe Profound 大功率助听器的主要目标… 在所有环境下可听 …无声反馈并且聆听舒适! 增加的言语噪声比 (SpNR) 我们面临的挑战… 方向性系统降低可听度 降噪系统针对的是噪声 声反馈管理系统减少增益 我们可以在大功率助听器中采用这些技术吗?