Abstract Measurements of power density emitted by a mobile phone were carried out as a function of the sound frequency transmitted by a sound generator, ranging from 250 to 14000 Hz. Output power density was monitored by means of the selective radiation meter Narda SRM 3000 in spectrum analysis mode, and the octave frequency analysis of each tone used for the experimental design was acquired by the sound level meter Larson Davis LxT Wind. Vodafone providers were used for mobile phone calls with respect to various local base station in Southern-Italy. A relationship between the mobile phone microwaves power density and the sound frequencies transmitted by the sound generator was observed. In particular, microwaves power density level decreases significantly at sound frequency values larger than 4500 Hz. This result can be explained assuming that discontinuous transmission mode of global system for mobile communications is powered not only in silence-mode, but also at frequencies larger than 4500 Hz.

中文翻译：

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作为输入声音频率的函数的移动电话输出功率密度的测量

摘要 手机发射的功率密度测量是作为发声器发射的声音频率的函数进行的，范围从 250 到 14000 Hz。输出功率密度通过选择性辐射计 Narda SRM 3000 在频谱分析模式下进行监测，用于实验设计的每个音调的倍频程频率分析由声级计 Larson Davis LxT Wind 获取。Vodafone 供应商用于与意大利南部的各种本地基站进行移动电话通话。观察了手机微波功率密度与发声器传输的声音频率之间的关系。特别是，当声频值大于 4500 Hz 时，微波功率密度水平会显着降低。