Sound tests conducted at Pistorius's home

The tests were conducted to determine how sound travels in the dead of night.

Oscar Pistorius leaves the Pretoria High Court under heavy security after the second day of his murder trial on 4 March 2014. Picture: Sebabatso Mosamo/EWN.

JOHANNESBURG - Defence lawyers on Tuesday confirmed they conducted tests at athlete Oscar Pistorius's Silver Woods Country Estate home in February to establish how sound travels in the dead of night.

The Olympic and Paralympic athlete is in court for murdering his girlfriend Reeva Steenkamp at his luxury home in Pretoria East back in February 2013.

The athlete pleaded not guilty to all charges in the North Gauteng High Court in Pretoria on Monday.

Oscar Pistorius is escorted into the Pretoria High Court ahead of the second day of his murder trial on 4 March 2014. Picture: Sebabatso Mosamo/EWN.

Details of the tests emerged during the cross-examination of neighbour and second witness Estelle van der Merwe.

She told the court she heard a woman's voice before Pistorius shot and killed his girlfriend.

Defence Advocate Barry Roux told the court tests of a man and woman screaming inside Pistorius's house were conducted just two weeks ago.

Defence advocate Barry Roux on the second day of the Oscar Pistorius murder trial at the High Court in Pretoria on 4 March 2014. Picture: Pool.

He says this was done between 1am and 2am in the morning.

Experts wanted to establish how far sounds would travel.

Roux put it to van der Merwe, who lives diagonally across the road from Pistorius, that she could not hear the screams.

Earlier in the case, she told the court that in the early hours of Valentine's Day in 2013, she woke up hearing a woman's voice.

Van der Merwe said an hour later, she heard a noise that sounded like gunshots.

She said she did not hear any screams.

The state's first witness, Michelle Burger, on Monday gave the court haunting evidence about hearing "blood-curdling" screams, four gunshots and then silence from the athlete's house.

Roux questioned Burger about each detail of her testimony.

He put it to Burger that she was in fact asleep when Pistorius fired the four gunshots which killed Steenkamp.

Roux also said Pistorius sounded like a woman when he screamed because his voice pitched when he was anxious.

In court on Tuesday, Charl Johnson, who is Burger's husband, was called to the stand shortly after lunch on day two of the case.

Johnson and Burger live in Silver Stream Estate, which is adjacent to the Silver Woods Country Estate, where the shooting took place.

The couple has a direct line of sight to Pistorius's multimillion rand property.

Johnson, the state's third witness, said he heard "distressful" screams and five or six gunshots.

Get all the latest developments on the EWN Oscar Pistorius portal.