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Sony Group Corporation, formerly known as Tokyo Tsushin Kogyo K.K. and Sony Corporation (ソニー株式会社), commonly known as Sony, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. The Sony Group comprises entities such as Sony Corporation, Sony Semiconductor Solutions, Sony Entertainment, Sony Interactive Entertainment, Sony Financial Group, and others.
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Vehicle audio is equipment installed in a car or other vehicle to provide in-car entertainment and information for the occupants. Until the 1950s, it consisted of a simple AM radio. Additions since then have included FM radio (1952), 8-track tape players, cassette players, record players, CD players, DVD players, Blu-ray players, navigation systems, Bluetooth telephone integration, and smartphone controllers like CarPlay and Android Auto. Once controlled from the dashboard with a few buttons, they can be controlled by steering wheel controls and voice commands.
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A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following the invention of the transistor in 1947—which revolutionized the field of consumer electronics by introducing small but powerful, convenient hand-held devices—the Regency TR-1 was released in 1954 becoming the first commercial transistor radio. The mass-market success of the smaller and cheaper Sony TR-63, released in 1957, led to the transistor radio becoming the most popular electronic communication device of the 1960s and 1970s. Transistor radios are still commonly used as car radios. Billions of transistor radios are estimated to have been sold worldwide between the 1950s and 2012.
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The history of Sony, a Japanese multinational conglomerate, dates back to 1946.
A transistor is a semiconductor device with at least three terminals for connection to an electric circuit. In the common case, the third terminal controls the flow of current between the other two terminals. This can be used for amplification, as in the case of a radio receiver, or for rapid switching, as in the case of digital circuits. The transistor replaced the vacuum-tube triode, also called a (thermionic) valve, which was much larger in size and used significantly more power to operate. The first transistor was successfully demonstrated on December 23, 1947, at Bell Laboratories in Murray Hill, New Jersey. Bell Labs was the research arm of American Telephone and Telegraph (AT&T). The three individuals credited with the invention of the transistor were William Shockley, John Bardeen and Walter Brattain. The introduction of the transistor is often considered one of the most important inventions in history.
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Perdio Radio was a British electronics company founded by Derek Willmott and Joyce Willmott in 1955. Former RAF pilot Derek Willmott was a DECCA researcher developing RADAR applications and was already an inventor, with designs for multiple miniaturisation applications in consumer electronics, including designs for portable personal tape players and small radios and televisions. The newly available transistors allowed the Willmotts to enter the market with Perdio, producing the PR1 in 1957. A 5 Transistor design meant a highly compact and efficient unit which led on to production of 56 models bearing the Perdio name. Perdio also produced the Portarama Television set currently on display in Londons Science Museum along with a 'Spinny' radio.
DC-International is a tape cassette format developed by Grundig and marketed in 1965. DC is the abbreviation of "Double Cassette", as the cassette contained two reels; International was intended to indicate that, from the beginning, several companies around the world supported the format with suitable tape cassette tape recorders, recorded music cassettes and blank cassettes. Since DC-International did not compete effectively against the similar Compact Cassette, it was discontinued in 1967.
References
- ↑ https://www.radiomuseum.org/r/sony_sony_tr52_tr_52_tr_52.html
- ↑ Sony History Chapter6 Transistor's number used the suffix "seki"
- ↑ John Nathan (8 March 2001). Sony. Houghton Mifflin Harcourt. pp. 35–. ISBN 0-618-12694-5.
- 1 2 3 Robert Grayson (1 September 2012). Sony: The Company and Its Founders. ABDO Publishing Company. pp. 40–. ISBN 978-1-61480-183-2.
- 1 2 Michael B. Schiffer (1991). The Portable Radio in American Life. University of Arizona Press. pp. 208–. ISBN 978-0-8165-1284-3.
- ↑ "Model TR-55, Sony; Tokyo". Radiomuseum.org. RadioMuseum. Retrieved 9 April 2017.
- 1 2 "TR-55 Product Design". Sony.net. Sony. Retrieved 7 April 2017.
