Electromagnetic interactions between conventional earphones and the electroencephalography (EEG) electrodes used for analyzing brain waves give rise to efficiency problems in neurophysiological studies of auditory perception. Currently used speakers and headphones are electromagnetic devices based on strong magnets. In spite of intensive use of such systems, there has been no effective way to eliminate the electromagnetic artifacts produced by such audio transmitting devices to date. The ability for transferring audible sounds without the use of electromagnetic devices that can affect the EEG signal would open up many innovative possibilities in Audio Technologies. Audible sound transfer over long distances is possible by the photoacoustic effect. In such studies, the modulated optical signal can be converted into an audible signal arising from the absorption of the light energy of relevant molecules. In this study, we propose an earphone based on the photoacoustic effect, and calculated the dB SPL (Sound Pressure Level) values for a spherical cell filled with olive pomace. By the use of the method of Diebold and Westervelt, we theoretically calculated the sound pressure levels for our cell and determined a 60 dB SPL at a sound frequency of 1000 Hz for our preliminary earphone design.

传统耳机与用于分析脑电波的脑电图（EEG）电极之间的电磁相互作用在听觉感知的神经生理学研究中引起效率问题。当前使用的扬声器和耳机是基于强磁体的电磁设备。尽管大量使用了这种系统，但是迄今为止，还没有有效的方法来消除由这种音频传输设备产生的电磁伪像。在不使用会影响EEG信号的电磁设备的情况下传递声音的能力将为音频技术带来许多创新的可能性。光声效应可以实现长距离的声音传输。在这样的研​​究中 调制后的光信号可以转换为由于吸收相关分子的光能而产生的可听信号。在这项研究中，我们提出了一种基于光声效应的耳机，并计算了充满橄榄果渣的球形细胞的dB SPL（声压级）值。通过使用Diebold和Westervelt的方法，我们从理论上计算了单元的声压级，并为初步的耳机设计确定了在1000 Hz声频下的60 dB SPL。