Pit Signal Processing
SACD includes various copy protection measures of which the most prominent is Pit Signal Processing (PSP), a physical watermarking feature that contains a digital watermark modulated in the width of pits on the disc (data are stored in the pit length). The optical pickup must contain special circuitry to read the PSP watermark, which is then compared to information on the disc to make sure it is legitimate. Because the majority of DVD players and all DVD-ROM drives use an optical pickup that lacks this specialized watermark detection circuitry, although they can read the data on the SACD layer, they cannot decode the audio of a protected SACD disc.
On hybrid SACD discs, PSP is only applied to the SACD layer, not to the CD layer.
Read more about this topic: Super Audio CD
Famous quotes containing the words pit and/or signal:
“A tiger in a deep pit can be bullied by dogs.”
—Chinese proverb.
“By day thy warning ringing bell to sound its notes,
By night thy silent signal lamps to swing.”
—Walt Whitman (1819–1892)