![]() Though Sony predicted it would sell about 5,000 units a month, it sold more than 30,000 in the first two months. The metal-cased blue-and-silver Walkman TPS-L2, the world's first low-cost personal stereo, went on sale in Japan on July 1, 1979, and was sold for around ¥33,000 (or $150.00). He asked executive deputy president Norio Ohga to design a playback-only stereo version optimized for walking. ![]() Sony cofounder Masaru Ibuka used Sony's bulky TC-D5 cassette recorder to listen to music while traveling for business. Pavel later lost his suit claiming the Walkman idea as his own. In the 1970s, Brazilian inventor Andreas Pavel devised a method for carrying a player of this type on a belt around the waist, listening via headphones, but his " Stereobelt" concept did not include the required engineering advancements to yield high-quality sound reproduction while the tape player was subject to mechanical shock as would be expected on a person walking. ![]() Portable tape players of various designs were available, but none of them were intended to be operated by a person as they were walking. ![]() ![]() In the late 1960s, the introduction of prerecorded compact cassettes made it possible to listen to music on portable devices as well as on car stereos, though gramophone records remained the most popular format for home listening. The Compact Cassette was developed in 1963 by the Dutch electronics firm Philips. ![]()
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