FIRST BATTERY DRIVEN PORTABLE source of sound
and music was the transistor radio of the 1950s. In the
1970s, the magnetic audio cassette tape allowed recordings
to be played on portable tape players. Also, new metal
alloys permitted the tiny but high-power
magnets needed for lightweight earphones. In the 1980s, compact discs brought music into the digital era. Sony's
MD, or minidisc, introduced re-
recordable CDs that used magnetic
and optical technology. From the
mid 1990s, music could be stored
in all-electronic digital form in a
microchip, usually in the MP3 file
format. These files can be transferred
between devices and via the Internet.
Today, a variety of portable media gadgets can record, play, and store video, photographs, and music in electronic form.
and music was the transistor radio of the 1950s. In the
1970s, the magnetic audio cassette tape allowed recordings
to be played on portable tape players. Also, new metal
alloys permitted the tiny but high-power
magnets needed for lightweight earphones. In the 1980s, compact discs brought music into the digital era. Sony's
MD, or minidisc, introduced re-
recordable CDs that used magnetic
and optical technology. From the
mid 1990s, music could be stored
in all-electronic digital form in a
microchip, usually in the MP3 file
format. These files can be transferred
between devices and via the Internet.
Today, a variety of portable media gadgets can record, play, and store video, photographs, and music in electronic form.
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