| 摘要 |
A device for long-distance transmission of images includes a transmitter and a receiver, connected by a communications line. The transmitter contains a device which scans a picture in a linear pattern to form an electric signal modulated to represent the brightness of the picture in picture points along the scanned lines. The receiver has a picture reproduction device and a driver for moving the reproduction device relative to a picture-supporting surface in a linear pattern corresponding to the linear scanning pattern of the transmitter. Upon receiving this signal the picture points are reproduced line by line with a brightness which corresponds to the modulation of the electric signal. The transmitter contains a memory and a controller arranged to divide the transmission of the signal created by the scanning device into segments and, upon sensing a maneuver signal, to direct the memory to retransmit a portion of the signal corresponding to one segment to the receiver. The receiver is provided with a memory and a control unit arranged to verify each signal segment received via the communications line with respect to errors while simultaneously storing each signal segment in the memory. If a preselected level of error has not been exceeded, the signal segment is transferred from the memory to the picture reproduction device. If this error level has been exceeded the aforementioned maneuver signal is sent to the transmitter to direct it to retransmit the erroneous signal segment and the erroneous signal segment, store in the receiver's memory, is erased.
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