Abstract
The 13th channel of the DTTB (Digital terrestrial television broadcasting) signal is the lowest frequency in the DTTB and adjacent to wireless communicator signal for taxi on frequency band. Therefore, the 13th channel has a possibility to degrade if wireless communicator for taxi is used near the receiving antenna for DTTB. We once mentioned degradations of the DTTB signal by wireless communicator for taxi under the multipath environment. In this paper, we mention comparison with reception characteristics of filters in indoor and field experiments. We also describe improvement by the filters.
