http://abcnews.go.com/International/wireStory/ping-discovery-prompts-phase-plane-search-23219127
U.S. Navy Capt. Mark Matthews said on both occasions the Ocean Shield detected sounds, the pings were emitted about 1 second apart — consistent with those that could be sent from the black boxes: the flight data recorder and cockpit voice recorder.
The signals were broadcast at 33.3 kilohertz rather than the 37.5 kilohertz frequency at which black boxes are supposed to broadcast pings. Matthews said that according to the manufacturer, the frequency of the black boxes can drift near the end of the device's shelf life, which is about six years.
而CCTV报道共军探到的是37.5KHz信号。
Crossover: China’s Haixun 01 picked up 37.5 kHz pulse signal
http://english.cntv.cn/2014/04/06/VIDE1396783681299537.shtml
