First media tetrad: Old medium of communication Radio
Radio has always been crucial part of entertainment and news broadcasting since its invention. As a medium of communication it has provided voice to new, music and live broadcasting of events. The made other form of media such as new paper and magazine less popular when it was introduced. It retrieved a lot of technology from transmission of signals. Radio is the transmission of signals by modulation of electromagnetic waves. Radio as a medium of communication is reinventing itself by means of new technologies such as digital and satellite radio.
Second tetrad: Contemporary medium of communication: Mobile phone
Mobile phones have provided us great deal of freedom to communicate. The function of contemporary mobile phone goes beyond our imagination since its invention. It can take photos, work as GPS and personal assistant. It has made old technology such as corded phone and walky-talky obsolete. It retrieves a great amount of technology from its predecessor such as cordless phones and walky-talky. As it is pushed to its extreme mobile phone manufacturers are trying to provide much more efficient technology to improve reception and functionality of mobile phone.
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