这两种型号均采用了前反馈和健全的离轴增加抑制高增益超心形图案。
Both models feature super cardioid patterns for high gain before feedback and increased rejection of off axis sound.
根据离轴多程放大系统的光路特点，对产生谐振腔最可能的光路部分进行了自激振荡形成条件的分析，根据分析结果并结合实际情况采取了一些抑制自激振荡的措施。
Based on the character of off-axis and multi-pass amplification systems, the possibilities are analyzed that some part of the line could form optical oscillator and occur self-excitation oscillation.
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