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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.Metros
Suspicious radio signals intercepted around city

Areas where these signals were received are within 25-30 km radius of Kolkata.

22 Nov 2018 12:43 AM IST

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