| 摘要 |
The invention realizes high speed image transmission in an image processing system such as a facsimile system by reducing redundancy of an image data source for transmission, and improves the error rate of analog transmission systems by combining a synchronizing signal of a plurality of bits with a skip signal of a plurality of bits. The white block skip system can be applied not only to the AM-PM-VSB system but also to the AM-DSB system by discriminating a synchronizing signal, a skip signal, a guard band signal and a picture signal based on only amplitude data and duration data and not on phase data. Errors in received images due to transmission line distortion are eliminated by first transmitting from a transmitter signals of high level for a predetermined number of bits and then signals of zero level, and by checking at a receiver the received signals every predetermined number of bits. High speed transmission is realized by simultaneously performing detection of the synchronizing signal and the AGC signal. When there is a picture signal immediately after the skip signal, a guard band signal is interposed between these signals. When one skip signal succeeds another, the guard band signal is not included, thus allowing high speed transmission without gradation in image quality.
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