Unverified75% confidenceDecision RuleTime unknown
定时关机功能应支持渐弱淡出（fade-out）而非硬性切断——声音突然中止可能惊醒浅眠者，渐弱关闭在30秒到2分钟内逐步降低音量更平滑
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75%
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Long-term
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Unverified定时功能必须支持'渐弱关闭'(fade out)而非硬切断，硬切断在入睡临界点会因声音突然消失把人惊醒，优先选带30-60分钟渐弱定时的机型93% similarUnverified助眠音频设备定时关机应支持渐弱（fade-out）而非直接切断，突然静音会造成环境声音反差惊醒，建议选带30/60/90分钟且末段音量渐弱功能的机型92% similarUnverified定时关机功能必须选带'渐弱淡出'（fade-out）的机型：硬性到点静音会因声音的突然消失把浅睡者惊醒，理想的淡出时长应≥30秒；仅有'定时'而无淡出功能的产品在助眠场景是明显缺陷92% similarUnverified定时关机功能应支持'渐弱'而非'骤停'，骤停的声音突变反而会惊醒浅睡者；优选支持15/30/60分钟多档且带fade-out的机型92% similarUnverified带定时关机的机型分'渐弱淡出'和'突然静音'两种，突然静音会因声音落差惊醒浅眠者，助眠用途应选支持15/30/60分钟渐弱淡出的机型92% similar
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