| 摘要 |
PROBLEM TO BE SOLVED: To compute the optimum tap coefficient of waveform equalization at all times by holding the tap coefficient immediately before tuning at the time of analog modulation wave signals and performing computation and output by prescribed algorithm at the time of digital modulation wave channels. SOLUTION: Outgoing control data are utilized and whether they are the analog modulation wave signals or digital modulation wave signals are stored in a channel memory 3 corresponding to respective channel numbers. Then, tuned channel number data 13 are inputted to a channel tuning device 2 and a channel comparator 5. The tuning device 2 tuning-controls a tuner 1 and the comparator 5 compares the number stored in the memory 3 with the data. Modulation wave signals are discriminated by the operation and discrimination data 14 are outputted to a tap coefficient output controller 8. The controller 8 holds the tap coefficient of a filter 7 at the tap coefficient immediately before the ON of a power source or the tuning at the time of the analog modulation signals based on the data 14. Also, at the time of the digital modulation signals, the computation is performed by the prescribed algorithm and the output to the filter 7 is performed. |
