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How do voices travel on mobile phones?

How do voices travel on mobile phones?
Peter from Cheshire (age 5-14)

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2 Responses

  1. Your mobile phone has microphone it that converts the sound waves from your voice which are transmitted as compressions and rare fractions of pressure through the air into an electrical signal. This electrical signal is then ‘attached’ to a wave by some clever electronics. You can’t hear this wave but your voice is encoded onto it and then transmitted through the network.

    At the other end the process is reversed and your voice is removed from the wave and played back through the speaker.

  2. A modern GSM digital mobile phone works in a different way from the previous analogue variety. After the phone has established a link with the base station your voice is converted to an electrical signal and then digitally encoded and transmitted to the base station. At the base station it is mixed together with other signals (multiplexed) and passes into the public switched telephone network. When it reaches its destination your voice is removed from the mixed signals and reconstituted. The coding is removed and finally the electronic signal is turned back into an audio signal by the speaker in the receiving phone.

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