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美驻古使馆“声波攻击”录音公布 源头仍是谜

2017-10-14 06:57:54   

美国白宫办公厅主任约翰·凯利12日称,白宫认为古巴本可以阻止美驻古巴外交人员遭受的“声波攻击”。当天,美联社公布一段美外交人员遭受“攻击”时录下的声响。眼下,美方尚未确定声波同外交人员的异常症状之间是否有直接联系。

“我们认为古巴政府可以阻止对美驻古巴外交官的‘声波攻击’,”凯利当天在记者会上说。

国务院发言人希瑟·诺尔特说,调查仍在进行,尚不清楚事件幕后元凶。

美联社报道,那段录音为高分贝、“吱吱”作响的电子杂音,不过尚未查明这段声响究竟源自何种设备。

受到所谓“声波攻击”的外交人员说,他们此前听到的声响音量极高。美联社对比分析了几段不同场景下的录音,发现其中均出现高分贝声音。这些外交人员证实,录音同他们听过的声响大致相同。

美联社公布的录音通过数码技术强化,调高音量,降低了背景噪音。频谱分析仪显示,录音中的声响并非单一音质,而是由至少20种不同频率、音高的声音组成。这些不同频率的声音听起来像是不同钢琴键同时弹奏时发出的刺耳声音。

声学专家、乔治·华盛顿大学教授考希克·萨卡尔对录音分析后表示,录音中包含20个波峰,“波峰和波谷之间的间隔都一样,波峰频率一致,但同其他波段的频率不同”。

传统的录音装置无法记录极高或极低频率的声响。眼下,美方调查人员仍在调查“声波攻击”中是否含有次声或超声。

美联社说,这份在哈瓦那获得的录音已被送到美国海军和情报部门检测。海军方面尚未就此置评。诺尔特也没有就录音的真实性置评。

最近两个月,美方称驻古外交人员遭到“声波攻击”,22人出现异常症状,部分身体不适者已回国治疗。

作为对“声波攻击”事件的回应,本月3日,美国国务卿雷克斯·蒂勒森宣布驱逐15名古巴驻美大使馆外交人员。他上月表示,美方正考虑关闭驻古使馆。

古巴一直否认参与实施任何攻击,并认为美方撤离使馆人员的决定“过于仓促”,会影响两国关系,但表示会继续配合美国查明事件真相。

一些接受美联社采访的美国官员说,古巴方面可能的确与攻击事件无关。

分析人士认为,美方利用驻古外交人员的健康问题向古巴发难,希望借此增加对古谈判筹码。同时,共和党籍总统唐纳德·特朗普希望利用古巴议题迎合党内保守派人士,并兑现外交领域的竞选承诺。(金悦磊)(新华社专特稿)

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