2. A system as claimed in claim 1, further comprising a decompression device which comprises a third input for receiving the compression bits, a second, word-wise organized read/write memory for accommodating at least the binary pixel data of a complete picture line, a third shift register with a parallel input and a parallel output for storing, during a second memory operation, a third series of data bits of a directly preceding picture line from the second read/write memory addressed by a third address, and for presenting said third series, by way of second shift control of the third shift register, to a decompression translator, a third output of the decompression translator connected to the series input of a fourth shift register to present thereto a series of data bits of a current picture line, and to present said series of data bits to the decompression translator on an output of the fourth shift register, said fourth shift register also comprising a parallel output for writing, during said second memory operation, a fourth series of data bits of the current picture line back into the second read/write memory, said second read/write memory addressed by a fourth address which occupies a fixed relative position with respect to the third address, a code word recognizer which comprises a parallel/series converting input element and an end-around coupled sequencer for signalling the recognition of a code word to the decompression translator; a second sequential logic element which comprises at least two states in order to activate said parallel/series converting input element in a third state until a code word has been recognized and to activate said second shift control in a fourth state in reaction thereto until a series of data bits in agreement with the group of significant compression bits of the code word thus recognized has been presented to said fourth shift register.
2. A system as claimed in claim 1, further comprising a decompression device which comprises a third input for receiving the compression bits, a second, word-wise organized read/write memory for accommodating at least the binary pixel data of a complete picture line, a third shift register with a parallel input and a parallel output for storing, during a second memory operation, a third series of data bits of a directly preceding picture line from the second read/write memory addressed by a third address, and for presenting said third series, by way of second shift control of the third shift register, to a decompression translator, a third output of the decompression translator connected to the series input of a fourth shift register to present thereto a series of data bits of a current picture line, and to present said series of data bits to the decompression translator on an output of the fourth shift register, said fourth shift register also comprising a parallel output for writing, during said second memory operation, a fourth series of data bits of the current picture line back into the second read/write memory, said second read/write memory addressed by a fourth address which occupies a fixed relative position with respect to the third address, a code word recognizer which comprises a parallel/series converting input element and an end-around coupled sequencer for signalling the recognition of a code word to the decompression translator; a second sequential logic element which comprises at least two states in order to activate said parallel/series converting input element in a third state until a code word has been recognized and to activate said second shift control in a fourth state in reaction thereto until a series of data bits in agreement with the group of significant compression bits of the code word thus recognized has been presented to said fourth shift register. 3. A decompression device as claimed in claim 2, wherein a counting element is provided for counting the data bits presented to said fourth shift register after the recognition of a horizontal code, and a comparison element for comparing the counting sum with a counting sum of a "make-up" or a "terminate" code word which is translated by the code word recognizer from a horizontal code word upon recognition thereof.