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第4章 助听器调试(1 / 2)

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"一。"

"二。"

"三。"

听力师机械般的声音从耳机里传来,每个数字间隔三秒,音调平板得令人昏昏欲睡。商司瀚坐在轮椅上,手指不耐烦地敲击着扶手,节奏越来越快。这已经是今天的第三轮测试了,同样的数字,同样的语调,同样的——无聊。

"能换个方式吗?"他摘下耳机,声音因为长时间沉默而有些嘶哑。

听力室很小,墙壁覆盖着吸音材料,给人一种奇怪的窒息感。商司瀚的轮椅占据了大部分空间,文暖暖不得不站在角落里,手里捧着那本蓝色封面的记录本。她今天穿了一件浅黄色的连衣裙,在灰暗的听力室里像一束阳光。

"标准流程必须完成。"听力师推了推眼镜,镜片后的眼睛疲惫而固执,"请重新戴上耳机,我们从500Hz开始。"

商司瀚的嘴角绷紧了。他看了一眼文暖暖,后者对他轻轻摇头——别发脾气。他深吸一口气,重新戴上那副笨重的测试耳机。耳机压着他耳后的疤痕,那里是灵梧植入第一代声波芯片的位置,如今换成了最新型的神经耦合助听器。

"一。"

"二。"

"三。"

数字再次响起,这次音调更高一些。商司瀚机械地举起左手,每次听到声音就竖起一根手指。他的右手仍然无力地垂在轮椅扶手上,像一只折翼的鸟。

测试进行到第八分钟时,一阵杂音突然从耳机左侧传来。商司瀚皱眉,以为是设备故障。但随即他意识到——那不是杂音,而是从隔壁房间漏进来的钢琴声。有人正在笨拙地弹奏《小星星》,节奏忽快忽慢,音符时高时低,简直是对音乐的亵渎。

商司瀚的嘴角不自觉抽动了一下。

"请集中注意力。"听力师严肃地说,调整着控制台上的旋钮,"接下来是1000Hz测试。"

钢琴声越来越清晰,虽然隔着一堵墙和一副降噪耳机,但那荒腔走板的旋律顽强地钻入商司瀚的耳中。突然,演奏者在一个高音处严重跑调,刺耳的音符像指甲刮过黑板。

"升F弹成F了。"商司瀚脱口而出,再次摘下耳机。

听力室陷入死寂。文暖暖的笔停在记录本上,墨水晕开一个小圆点。听力师的手悬在半空,眼睛瞪得溜圆。

"什么?"文暖暖先反应过来。

商司瀚似乎也被自己的话惊到了。他指了指隔壁:"念荨。弹错了。《小星星》。"每个词都像从牙缝里挤出来的,但连在一起的意思再清楚不过——他听到了隔壁的钢琴声,而且准确分辨出了错误的音符。

听力师猛地站起来,差点带翻椅子。他扑到控制台前,快速检查设备设置:"不可能!测试频率范围是500-4000Hz,钢琴声的基频虽然在这个范围内,但隔壁有隔音处理,声压级至少低于30分贝..."

文暖暖的眼睛亮了起来。她放下记录本,轻手轻脚地走到门前,把门拉开一条缝。立刻,《小星星》的旋律清晰地飘进来,比之前更加惨不忍睹。确实是念荨——她今天跟着护士长去儿童活动区玩了,那里有架老旧的立式钢琴。

"再来一次!"听力师激动地说,快速调整设备,"这次我会播放不同频率的纯音,您只需要告诉我是从哪边耳机听到的。"

商司瀚重新戴上耳机。接下来的二十分钟里,听力师播放了从低频到高频的各种声音,有些甚至超出了常规测试范围。商司瀚的反应时好时坏,有时能准确指出声源方向,有时则完全听不到。

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