Prostate-specific antigen (PSA) is a substance produced by the prostate gland. Elevated PSA levels may indicate prostate cancer, a noncancerous condition such as prostatitis, or an enlarged prostate.
Dolby Digital, formerly known as AC-3, is a digital audio coding technique that reduces the amount of data needed to produce high quality sound. Dolby Digital takes advantage of how the human ear processes sound.
Dolby Digital. Dolby Digital, the Vizio's other surround sound option, is an older technology that is frequently used in cinemas, on Blu-ray disks and DVDs. Unlike in PCM, Dolby Digital's data stream is compressed using a lossy format. This means that during compression, some data is lost.