| 摘要 |
PCT No. PCT/EP91/02520 Sec. 371 Date Nov. 9, 1992 Sec. 102(e) Date Nov. 9, 1992 PCT Filed Dec. 24, 1991 PCT Pub. No. WO92/12585 PCT Pub. Date Jul. 23, 1992.A radiotransmission station transmits digital data at a predetermined rate to a receiving station. The receiving station is controlled by a timing circuit which recognizes a predetermined enabling code. The digital data is transmitted as bit sequences and each sequence contains a first group of bits for synchronizing the timing circuit and the transmission rate. This first group of bits is followed by a second group of bits which includes the enabling code. The recognition of the enabling code enables the reviewing station to receive and process the transmitted information. The enabling code is derived from a sequence of logical "1" and "0" bits and certain bits of the sequence are altered to form groups of three like bits (111,000). Each group of three bits has no more than two adjacent pairs of like and opposite bits (00,11). The group of like bits are arranged in a first part of the second group so that the chances of incorrect recognition are minimized and the synchronization achieved by the first group is unaltered. |
