消除侧音采用了回波相消技术。
ECH (Echo Canceller Hybrid System) is used to remove sidetones.
有优良的消侧音电路，对讲声音清晰。
自定义侧音音量衰减通过的EEPROM。
本文阐述了侧音测距信号设计，相位跟踪等理论。
This thesis introduces design of side tone range acquisition signal and phase trace theory.
侧音测距系统的最大无模糊距离受到侧音信号最低频率的限制。
The unambiguous distance of tone ranging system is limited by the lowest frequency of tone.
目的应用同频音掩蔽试验观察不同个体最小对侧掩蔽级(MCML)与主观纯音听阈之间的关系，进而通过MCML判定被试者主观真实听阈。
Objective to investigate the relationship between minimum contralateral masking level (MCML) and pure tone threshold of the masking ears by the same frequency tone masking test.
同时有双侧感音性听力下降。
结论大前庭导水管综合征病儿初次发病时一般为双侧中重度以上感音神经性听力损失，随后波动性听力逐渐下降直至全聋。
ConclusionGenerally, moderate or severe neurosensory hearing loss of both ears occurs at the initial episode of LVAS and aggravates gradually to total deafness.
结论大前庭导水管综合征病儿初次发病时一般为双侧中重度以上感音神经性听力损失，随后波动性听力逐渐下降直至全聋。
ConclusionGenerally, moderate or severe neurosensory hearing loss of both ears occurs at the initial episode of LVAS and aggravates gradually to total deafness.
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