| 摘要 |
PURPOSE:To save the system adjusting man-hour by obtaining a deviation between a reception data demodulated and identified at a demodulation section and a transmission data, writing a corrected transmission data subtracting in advance the deviation from the transmission data into a storage section, and transmitting the corresponding corrected transmission data to a modulation section when an external data is fed to the storage section. CONSTITUTION:A transmission data corresponding to a signal point is fed to a modulator 3 from the 1st interface 10 via a D/A converter 1 to generate a QAM wave, which is transmitted to a receiver. The received QAM wave is demodulated and identified by a demodulator 13 and an A/D converter in the receiver and reproduced. The reproduced reception data is fed to a subtraction section from the 2nd interface 15 and the deviation with the transmission data is obtained and a value correcting the deviation is decided. The operation above is executed to all transmission data and the corrected transmission data corrected by a correction value to each transmission data is written in the storage section. When a data is fed to the storage section externally, the corrected transmission data corresponding to each data is transmitted to the receiver via the D/A converter 1 and the modulator 3. |
