File:John_Logie_Baird_and_television_receiver.jpg
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摘要
描述John Logie Baird and television receiver.jpg |
English: Scottish television pioneer John Logie Baird (left) and his television receiver. This was one of the world's first television systems, with which Baird demonstrated transmission of moving images in 1925. The transmitter consisted of a spinning disk with 30 lenses in it which focused light from a spot on the image onto a selenium photoelectric cell. As each lens swept across the subject the photocell produced an electric signal which varied with the brightness of the subject at each point along the scan line. In the television receiver shown here, the video signal from the transmitter is applied to a neon lamp behind another spinning disk with holes in it. As each hole sweeps in front of the lamp it reproduces a line of the image. Baird, left, holds a control with which he adjusts the speed of the disk to synchronize it with the transmitter disk. The reproduced image, visible at right was a dim orange, composed of 30 scan lines, just enough to recognise faces. Because human faces did not have enough contrast to show up well, Baird used ventriloquist dummies in his first demonstrations, making them move and talk for the camera. The image shows his partner with two dummies on his lap. The television image shown was probably retouched in this photo. |
日期 | |
來源 | Retrieved August 15, 2014 from Orrin Dunlap, Jr., "The Televisor" in Popular Radio magazine, published by Popular Radio, Inc., New York, Vol. 10, No. 7, November 1926, p. 668 on AmericanRadioHistory.com. |
作者 | Orrin Dunlap, Jr. |
授權許可 (重用此檔案) |
This 1926 issue of Popular Radio magazine would have the copyright renewed in 1954. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1953, 1954, and 1956 show no renewal entries for Popular Radio. Therefore the magazine's copyright was not renewed and it is in the public domain. |
其他版本 | The transmitter that produced this image is shown in John Logie Baird and Stooky Bill.png |
授權條款
Public domainPublic domainfalsefalse |
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本作品在美國屬於公有領域,是因為該作品是在1929與1963年之間出版,沒有在該作品增加著作權聲明,且沒有進行著作權更新。除非此作品之作者已經過世一段時間,並達到公有領域所要求的條件,這類美國作品在其他不適用較短期限法則的國家或地區屬於有著作權狀態,如加拿大(作者過世後70年)、中國大陸(作者過世後50年,港澳除外)、德國(作者過世後70年)、墨西哥(作者過世後100年)、瑞士(作者過世後70年)與其他已簽署個別協議的國家。更多資訊請參考Commons:Hirtle chart。
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11月 1926格里曆
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