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20
THE CINE-TECHNICIAN
February, 1954
appears possible through research which is now under way.
5. Assignment of Tape Channels For TV tape recording of colour television with the RCA system, five parallel channels are recorded on a single magnetic tape A inch in width. There is one recorded channel for each of the primary colour signals (red, green, and blue), for the synchronising signal, and for the sound signal. For black-and-white recording the tape carries two recorded channels, one for the TV signal and the synchronising signal, and one for the sound signal. For black-and-white television, a I inch wide tape would suffice.
In the demonstration of colour television recording on magnetic tape, the five recorded channels were obtained from the output of a colour television receiver. In reproducing from the recordings, the tape supplied the three primary colour signals direct to the three electron
guns of an RCA tri-colour kinescope, the signals needed to synchronise the scanning, and signal which carried the sound.
To re-broadcast a colour television programme from a tape recording as demonstrated, it is necessary to combine the three primary colour signals with the synchronising signal to form a composite signal to send to the transmitter. While this operation is not yet ready for demonstration, Dr. Engstrom said that it is the subject of current development that will provide the necessary apparatus to produce this result.
In summarising the present status of research and engineering problems as they relate to TV tape recording, Dr. Engstrom said:
" While some technical problems still must be surmounted before a TV tape equipment can be made available commercially, RCA considers that the toughest of them have been conquered and that further development is certain to solve the remainder."
RCA TAPE METHOD
RECORDING HEAD PUTS
PICTURE ANO SOUND SIGNALS ON ONE TAPE
TV TAPE RECORDERREPRODUCER
REPRODUCING HEAD PICKS UP SIGNALS FOR IMMEDIATE MONITORING OF TAPE
REWOUND TAPE READY FOR PLAYBACK
NEGATIVE PROCESSED
SIGNALS FROM STUDIO
OR MICROWAVE RELAY
COAXIAL CABLE
MOVIE CAMERA PICKS UP IMAGE FROM KINESCOPE
^COMPOSITE FILM REAOY FOR PLAYBACK
'FILM PROCESSED
PRINT MADE
AND SOUND
TRACK ADOED
RECORDING
REPRODUCING HEAD TAKES PICTURE AND SOUND SIGNALS OFF TAPE
TV TAPE ^ RECORDERREPRODUCER
(MAY BE SAME UNIT THAT MADE RECORDING)
SIGNALS PRODUCED A^ยป. BY EITHER METHOD SENT TO TRANSMITTER
SPECIAL TV CAMERA RECREATES PICTURE AND SOUND SIGNALS FROM PROJECTED FILM
REPRODUCING
Diagram shows steps in recording and reproducing a television programme by tape as compared to typical film method used in broadcasting station today