More signals from what is thought to be the MH370 black box

AN Australian search vessel has picked up two more signals from what could be the black box from missing Malaysia Airlines flight MH370.

The man in charge of the search, retired Air Chief Marshal Angus Houston, said the Ocean Shield picked up the traces on Tuesday afternoon and late on Tuesday night Perth time, the ABC has reported.

The planned search area is now 75,000 square kilometres and former Air Chief Marshal Houston said he was confident tthey were searching in the right area. 

"So I think we're looking in the right area, but I'm not prepared to confirm anything until such time as somebody lays eyes on the wreckage," he said.

The Ocean Shield would be looking to pick up more transmissions which would help to better pinpoint where the signal was coming from.