| 摘要 |
PURPOSE: To reduce the dispersion of each point of the constellation chart to its cloud by encoding filtered data encoded by 2N bits by 2M bits (M<N), and multiplying the data by a selected advanced distorting coefficient. CONSTITUTION: The output signal of an amplifier 15 is tapped so as to be supplied to a demodulator 81 followed by a low pass filter 82, and the output signal of the filter 82 is supplied to an adapting circuit 83. This circuit samples the output signal of the filter 82, and compares the data with input data. The difference generates an error signal, and an advanced distorting circuit 11 is updated by storing a new complex advanced distorting coefficient. Thus, the dispersion of each point of the constellation chart to its cloud can be reduced by reducing a noise and maximizing the quality of a desired material. |
