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Radio will never go extinct, yet the device with which we listen to radio has changed a lot. Whether you listen to it through the Internet or in your car doesn't matter, there will always be radio. You can of course download just about any song but its not the same. The radio stays the best companion.
Digital audio tapes used for sound recording and reproduction. Ins the 1970's digital recording on magnetic tape was developed for professional use and in the late 1980's for the consumer market. Audio signals are converted into digital data on a magnetic tape by a microprocessor (analogue-to-digital converter). A digital-to-analogue converter converts the data back to an audio signal for playback with the amplifier of a conventional stereo sound system. In digital recording sound waves are sampled thousands of times per second and then transformed into a series of pulses that correspond to patterns of binary code that are recorded on tape (or optical disc).
The last obstacle to marketing digital audio tape for home use was the potential of making copies indistinguishable from the original. This was overcome in the late 1980's when manufacturers adopted the Serial Copy Management System, allowing direct copying of CD's and other digital sources but copies may not be made of copies.
CD's have more space to store audio on and gives you a much higher sound quality. It also allows, much like DVD, direct access to any track at any time.