The paper cup receiver vibrates with solid sound waves. That is to say, when the sound source oscillates at one end of the pipe, the physical structure of the paper cup can effectively gather the sound, reduce the sound propagation, and transmit it to the paper cup at the other end through the middle rope. Through the vibration of air, the eardrum can receive low-level audio. The mask of paper cup is designed based on the principle that vibration propagates through sound medium, and thread propagates through linear energy. When we put words in one cup, sound waves will spread to another cup through the vibration of wool.

Paper cups depend largely on the principle of sound wave propagation in three-dimensional space. Because the sound source vibrates at one end of the paper cup, the enclosed space of the paper cup makes the sound waves gather together and transmit them to another paper cup through the rope. Paper-cup telephone transmits sound vibration to the other party through solid conduction (wire), and wired telephone converts sound vibration into electrical signal through wire conduction and transmits it to the other party, and then converts electrical signal into sound vibration. So the principle of paper cup telephone is different from that of wired telephone.

Through the vibration of air, the eardrum receives high and low audio. The paper cup microphone is designed by using the principle that sound vibration propagates through the medium and energy propagates through the straight line and the straight line. The principle of paper cup telephone is physical principle, that is, it relies on the vibration of solid sound waves to transmit sound. When the sound source vibrates at one end of the paper cup, the sound wave will be concentrated in the closed space and transmitted through the rope. When using a paper cup microphone, pay attention to its tightness, so that the sound can be transmitted more clearly. This kind of microphone is based on the vibration transmission principle of solid sound wave.

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