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Lesson 4

In Lesson 3 we 听 the 效果（效应） of cutting off 低 - and 高 - 频率 portions of the 為耳/音频 频谱 These we called 低切 and 高切 Sometimes it is desirable to 降低 低 - and 高 - 频率 contributions less 剧烈 than cutting them off For this the 乐句 衰减 is used

By 增强 these 重要 语 频率 at 5 to 10 dB 理解 of 语 can be improved especially with a 背景 of 樂/乐 or 声波 效果 This is called 临场 均

领夹式 声筒（麦克风） are very 流行 today and most of them are capable of reasonably good 品质 if used properly One problem with them is that the 高 - 频率 components of the voice are quite 指向 tending to miss the 声筒（麦克风） 增强 系统 响应/反应 at the 较高 频率 can 补偿 for this 损失

By introducing a 10-dB 提升 at 5000 赫兹（he zi） the 高 - 频率 components are restored

声筒（麦克风） 削峰 to shirt or necktie are
very close to the 胸 and are prone to pick
up 胸 共鸣 which for a man tend to overemphasize the voice components in the 区域 of 700 to 800 赫兹（he zi）

Now to 补偿 for 胸 共鸣 a 谷 of 6 dB at 750 赫兹（he zi） is 介绍

Thus we see that intentional 偏离 from the 理想化 平（坦） 响应/反应 may actually yield better 录制 声波 in the practical 感觉 樂/乐 may be made more pleasing to the 耳 and 语 may be made more understandable