One audio expert and two investigators - The jury in the George Zimmerman trial had a lot to listen to Monday after starting the day hearing testimony from an expert whose job is listening.

[Editor's note: Click the linked text to read the live update summary from that moment in court.]

Familiar Voice Recognition

Dr. Hirotaka Nakasoni concluded his testimony by saying [ANCHOR TAG: familiar] familiar voice recognition, or having people that knew the speech of the people in the 911 call containing screams in the background, would be better for this case.

Dr. Nakasoni works for the FBI as a senior scientist doing voice recognition work.

He testified that the usable audio sample taken from the 911 call was not long enough for analysis. Prosecutor Richard Mantei also had him explain the role pitch plays in determining age. Dr. Nakasone said determining the person’s age in this case would not be possible because pitch is known to be higher in extreme emotional states.

In cross examination, defense attorney Don West asked about listener bias and how people listening together to a sample can affect each other.

Mantei questioned Dr. Nakasone after West two times, ending his second redirect asking about familiar voice recognition being used to determine a speaking voice.

Google map

The Sanford police officer first to interview Zimmerman was Doris Singleton. Prosecutor Bernie De la Rionda went over that interview with her before the jury.

He played the audio recordings of both portions, which was done the night of the shooting.

Part of the interview included Zimmerman diagraming the event on a printed out Google map. Lines and scribbles showed where Zimmerman said he first saw Martin, stopped his car, lost sight of Martin and called the non-emergency line.

De la Rionda also pointed out Zimmerman’s use of the word “suspect” to describe Martin in his written statement.

But on cross examination, defense attorney Mark O’Mara asked Singleton if she saw Zimmerman show ill-will, hate or anger toward Martin.

She said no.

Unrecorded conversations

De la Rionda asked Singleton about two unrecorded conversations made with Zimmerman.

Singleton says Zimmerman noticed a cross she was wearing and asked her if she was Catholic. She said she asked why it mattered and he said his religion said it was wrong to kill someone. She told him that is not was God meant if he had to save his own life, she recalled.

The second conversation was when she mentioned to Zimmerman that they were still trying to identify the victim. She says Zimmerman replied, “He’s dead?” When she said she thought he knew that, Singleton says, Zimmerman seemed shocked.

Reenactment

The lead investigator assigned to the case, Chris Serino took the stand next. De la Rionda showed the jury the reenactment, or walk-through, Serino arranged with Zimmerman the next day.

With that, the jury heard Zimmerman describe on video at the scene what happened the night of the shooting.

Interview questions

De la Rionda also played a recorded police interview with both investigators, Serino and Singleton, and Zimmerman in an interview room.

They can be heard questioning aspects of Zimmerman’s account of the shooting, including following Martin and his claim Martin tried to smother.

Serino told O’Mara he is a “professional skeptic” and conducts “challenge interviews” to discover the truth.

Court ended with O’Mara continuing cross examination into Tuesday at 9 a.m.