PERTH, Australia — A Chinese ship involved in the hunt for the missing Malaysian jetliner reported hearing a “pulse signal” Saturday in southern Indian Ocean waters with the same frequency emitted by the plane’s data recorders, as Malaysia vowed not to give up the search for the aircraft.The Australian government agency coordinating the search for the missing plane said early Sunday that the electronic pulse signals reportedly detected by the Chinese ship are consistent with those of an aircraft black box. But retired Air Chief Marshal Angus Houston, the head of the search coordination agency, said they “cannot verify any connection” at this stage between the electronic signals and the missing Malaysia Airlines Flight 370. Military and civilian planes, ships with deep-sea searching equipment and a British nuclear submarine scoured a remote patch of the southern Indian Ocean off Australia’s west coast, in an increasingly urgent hunt for debris and the “black box” recorders that hold vital information about Malaysia Airlines Flight 370’s last hours.After weeks of fruitless looking, the multinational search team is racing against time to find the sound-emitting beacons in the flight and cockpit voice recorders that could help unravel the mystery of the plane’s fate. The beacons in the black boxes emit “pings” so they can be more easily found, but the batteries only last for about a month.A Chinese ship that is part of the search effort detected a “pulse signal” in southern Indian Ocean waters, China’s official Xinhua News Agency reported. Xinhua, however, said it had not yet been determined whether the signal was related to the missing plane, citing the China Maritime Search and Rescue Center.