A taped interview of Matt Sandusky speaking with police the night before Jerry Sandusky's trial began has been obtained by NBC's Today show.

In the 29-minute interview, Matt Sandusky, the adopted son of convicted child molester and ex-Penn Star football coach Jerry Sandusky, describes how he was allegedly molested by his foster father from age 8 to 15.

''If you were pretending you were asleep and you were touched or rubbed in some way, you could just act like you were rolling over in your sleep, so that you could change positions,'' the now-33-year-old Matt Sandusky said in an excerpt played Tuesday on ''Today.''

Sandusky goes on to describe how his father would blow raspberries on his stomach and touch his genitals.

When asked if he could remember any instances where he and Jerry Sandusky engaged in oral sex, Matt says that ''at this point I don't recall that.''

The tape, which was released without the knowledge or permission of Matt Sandusky, was confirmed to be authentic by his lawyers, according to the Associated Press.

''Although the tape was released without Matt's knowledge or permission, it illustrates that he made the difficult decision to come forward and tell the painful truth to investigators despite extraordinary pressure to support his father,'' lawyers Justine Andronici and Andrew Shubin wrote in a statement to AP.

It was just last week that the former Penn State assistant football coach was convicted of 45 counts of child abuse.

And while Matt stood by his father's side through most of the investigation, it wasn't until halfway through the trial that he came out with his own abuse allegations that date as far back as the late 1980s.

According to the tape, Matt Sandusky listed his grand jury testimony among the reasons for coming forward amid his adopted father's trial, saying he wanted to ''right the wrong'' that was ''going to the grand jury and lying.''

Defense attorney Karl Rominger has told the AP that, in reference to the tape, he and lead attorney Joseph Amendola believe that Matt Sandusky makes ''allegations that directly contradicts sworn testimony .... directly contradicts police statements he'd given previously, directly contradicts public statements and absolutely contradicts everything his family knows.''

Jerry Sandusky, 68, is currently under observation at the Centre County Jail, where he is isolated from other inmates pending a psychological review that will help determine the next step toward his sentencing in about three months, AP reports.

Warning: Some of the content of the tape is disturbing.

Courtesy: NBC 'Today Show'