TOKYO — DirecTV said Tuesday that it has increased its capital to 31.9 billion yen ($245 million) from 20.8 billion yen ($160 million) as of Saturday.The satellite platform also announced that IBM Japan Ltd. had acquired a 22% stake in the venture. The primary stakeholders are DirecTV Intl. Inc. and video rental chain Culture Convenience Club Co., which each have a 31.75% share. IBM Japan president Kakutaro Kitashiro has joined DirecTV Japan as a new partner investor, the company said in a statement. The company did not elaborate on the reason for the moves. DirecTV started full scale operation in Japan on Dec. 1 with 63 channels, joining PerfecTV in the direct satellite broadcasting business. PerfecTV boosted its advertising to coincide with the DirecTV launch. In April the JSkyB platform is scheduled to begin operations with 150 channels. JSkyB is backed by a powerful foursome of companies made up of Rupert Murdoch’s News Corp., Sony Corp., top rated Fuji Television Network Inc. and software house Softbank Corp.