Method of coding and/or decoding binary data for wireless transmission, particularly for radio transmitted data, and equipment for implementing this method

摘要

The invention filed involves a method of coding and/or decoding binary data for wireless transmission, particularly for radio transmitted data. A sequence of binary data, introduced at the entry to the coding machine with a class N coder (KOD) comprising a register (REG), a comparator (COMP) and a counter (CITN), where N is a number greater than or equal to 3, is separated into a sequence of binary data of the same value, so that the length of each such sequence is not less than one and not more than N, and so that the binary values of the data introduced at the entry to the coder (KOD) are compared with the value last received and recorded in it, the lengths of the same sequences at this entry are read up to the number N and, after reading to N, a sequence of binary data of a value opposite to the value at the entry to the coder (KOD) is inserted, this inserted data sequence having a length M, where M is a number greater than or equal to one and less than N. At the same time the value recorded in the register (REG) is inverted and the length of the inserted sequence M is entered into the counter, while with each change in the register (REG) of the recorded value of the last bit received, registration of the length of the data sequence from the counter (CITN) to the buffer (BUF) is initiated, whereupon the lengths of the sequences of binary data are interpreted as binary impulses of length X₁, X₂ . . . X_N, where X₁ to X_N are time constants of mutually different values, assigned to various lengths of sequences of the same binary data. Where length M of a sequence of data entered is greater than one, binary control data can be inserted directly into the sequence of data as a sequence of data of length N, followed by a sequence of data of length L, where L is greater than one and less than M. At the entry to the coding or decoding machine, data can also be sensed to detect the start of their transmission whereupon, after detection, the frequency of the transmitting and receiving equipment is synchronized by insertion, transmission and reception of a control sequence. The subject of the invention is also a method of decoding data encoded according to the procedure described above. In decoding, the time lengths of the received impulses are first of all converted into sequences of the same binary data and then the inserted sequences of length M and the inserted control commands, as the case may be, are removed from these sequences.