Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-04-18
1976-08-10
Britton, Howard W.
Telegraphy
Systems
Simplex-reversing periodic
178DIG24, 179 1555T, 360 9, 360 32, H04N 579, G11B 5012, G11B 1926
Patent
active
039743292
ABSTRACT:
Video pictures are taken by a standard television camera, and each frame (usually 1/30 of a second duration) is encoded on a magnetic storage disk rotating at a speed synchronous with the frame rate (1800 rpm for a 1/30 second frame), so that one frame is recorded during one rotation of the disk. The encoded disk is then rotated at a rate that permits the encoded magnetic transitions to be read or decoded at an audio frequency. The information thus obtained is transmitted over an audio frequency communication system, such as a telephone line, and is recorded on a second storage disk at the receiving end of the ransmission system, such as a telephone line, and is recorded on a secon storage disk at the receiving end of the transmission system, with the disk rotating at the same speed as the transmitting disk so that one frame is recorded for each revolution. Thereafter, the eceiving disk is rotated at a speed that will produce a satisfactory image on a television broadcast receiver or video monitor, preferably at 1/30 of a second per frame.
Successive pictures may be recorded each 1/30 of a second per frame and may be received at the slower receiving rate until the desired number of frames is received. Thereafter, successive pictures may be displayed by rotating the receiver disk at the higher speed, with the pick-up transducer moving from one line to the next at whatever speed is selected; for example, every 1/30th of a second. Novel mechanical apparatus and novel electronic circuits are disclosed to make possible this system. The pictures may be in black and white or in color.
REFERENCES:
patent: 3564127 (1971-02-01), Sziklai
patent: 3683111 (1972-08-01), Southworth
Bissell Henry M.
Britton Howard W.
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