| 摘要 |
In cable television systems, the subscribers are connected via individual remote-controllable converters to a cable which transmits a large number of programmes. The subscriber selects the desired programme by suitable tuning of the individual converter tuner. The converters are equipped with conventional cable tuners for television sets in their reception section and have a UHF band in addition to the VHF band. If a second cable is provided in order to increase the range of programmes offered, the channels in the VHF transmission band (Band III) of the second cable are converted into the UHF band by means of a frequency converter which is connected upstream of the converter. The two frequency bands at the input of the converter tuner are still converted back into Band I within the converter. |
