"The fact that the plane landed on a soft surface and that there was no fire helped keep the number of fatalities low, " he said.

BBC: Turkish plane crash in Amsterdam

Karl Hoffman, who lived in the flat, told jurors he had tried to put out the fire with a cup of water and a bottle of soft drink before a neighbour dialled 999.

BBC: Jim Shears (left) and Alan Bannon

The technology would enable a person talking to someone with a loud, high-pitched, rapid-fire voice to sound similar even if his actual voice was soft, low and slow, for instance.

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