| 摘要 |
PURPOSE:To prevent the pseudo synchronization of an error correction circuit which is caused by the pseudo synchronization of a demodulator. CONSTITUTION:A transmitter 1 inputs a code train 4 out of both code trains 4 and 5 of two series outputted from a convolutional coder 3 and a train 9 which secured the sum of the train 5 into a modulator 10. The modulator 10 modulates both trains 4 and 9. Meanwhile a receiver 20 inputs a data train 23 out of both received transmission data trains 23 and 24 of two series demodulated by a demodulator 22 and a train 28 secured the difference of the train 24 into an error correcting decoder 29. Then the decoder 29 decodes both trains 23 and 28. In such a configuration, the pseudo synchronization of an error correction circuit can be prevented despite the pseudo synchronization caused in a carrier wave reproduction circuit of the demodulator. |
