Cell phone that requires no batteries – a major leap forward in moving beyond chargers, Cords and dying phones. Instead, the phone is powered from either ambient radio signals or light. The team of researchers from University of Washington has developed a cell phone that requires no batteries.
To achieve this feat, researches eliminated a power hungry step in most modern cellular transmission – converting analogue signals that convey sound into digital data that a phone can understand. This process consumes so much energy that it has been impossible to design a phone that can really on ambient power sources.
The battery free cell phone takes advantages of tiny vibrations in a phone’s microphone or speaker that occur when a person is talking into a phone or listening to a cell. An antenna connected to these components converts their motion into changes in standard analogue radio signal emitted by a cellular base station.
To transmit speech, the phone uses vibrations from the devices microphone to encode speech patterns in the reflected signals. To receive speech, it converts encoded signals into sound vibrations, which are picked by the phone’s speaker. In the prototype device the user processes a button to switch between “transmitting & listening” modes.

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