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Phonovision
Phonovision is a proof of concept format and experiment for recording a mechanical television signal on gramophone records. The format was developed in the late 1920s in London by Scottish television pioneer John Logie Baird. The objective was not simply to record video, but to record it synchronously, as Baird intended playback from an inexpensive playback device, which he called a "Phonovisor".〔http://www.tvdawn.com/tv1strx.htm〕
==Technical information==
The process involved mechanically linking the television scanning mechanism, a Nipkow disk, and the record-mastering turntable. The video signal from the Nipkow disc scanner was amplified and connected to the cutting stylus of the turntable. Baird had to make a number of compromises to get the process to work, among them using a picture rate of only four frames per second. Unlike Baird's other experiments (including stereoscopy, colour and infra-red night-vision), there is no evidence of a public demonstration of playback of pictures. The results were considered a failure at the time, and Baird moved on leaving behind several discs in the hands of museums and favoured company members.
Despite its technical problems, Phonovision remains the very earliest means ever invented of recording a television signal. In a sense, it can be seen as the progenitor of other disc-based systems, such as the European TelDec system of the early 1970s and RCA's Capacitance Electronic Disc, known as SelectaVision.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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