Friday, Apr 26, 2024 | Last Update : 05:43 AM IST

battery-free cell phone

During a call, the cell phone uses vibrations from the microphone to encode speech pattern in ambient signals for sending voice data. To receive the audio signals, it converts encoded radio signals to sound vibrations, which are picked up by the speaker.

Researchers develop a cell phone that needs no battery

The basic cell phone operates without a power source and uses existing infrastructure to make calls.

09 Jul 2017 10:25 AM


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