Digital signal transmission system |
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| 申请号 | JP12209184 | 申请日 | 1984-06-15 | 公开(公告)号 | JPS612439A | 公开(公告)日 | 1986-01-08 |
| 申请人 |
Kokusai Denshin Denwa Co Ltd |
发明人 | YASUDA YUTAKA; HIRATA YASUO; | ||||
| 摘要 | PURPOSE:To obtain easily an error correction effect almost equivalent to that of a low encoding ratio code of which encoding ratio is 1/m that of an original code through a simple encoder/decoder by decoding equivalently a code having k/nm encoding ratio to a code having k/n encoding ratio by m-times of multiplex-transmission at transmission side and averaging operation at reception side. CONSTITUTION:An input data string 1 having R data speed is converted into an encoded data string 3 by an original code encoder 2 and the data string 3 is sent to an m-times multiplexer 4 for an encoded bit. At that time, the data speed is n/k times which is the reciprocal of k/n encoding ratio. A transmission data string 5 having the data speed of m-times that of the encoded data string 3 is formed by multiplexing each encoded bit included in the data string 3 repeatedly m times through the m-times multiplexer 4 and a transmission signal 7 modulated by a modulator 6 is sent to a transmission line. On the receiving side, a base band signal sample value 10 obtained by demodulating a receiving signal 8 by a demodulator 9 is averaged by an m-bit averaging circuit 11 and a decoder input data string 12 to be inputted to an original code decoder 13 is formed on the basis of said average value. | ||||||
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