Yamaha AV-S77 Mode D'emploi page 39

GLOSSARY
I VIRTUAL SURROUND
YAMAHA has developed a virtual CINEMA DSP algorithm
that allows you to enjoy DSP sound field surround effects
even without any rear speakers by using virtual rear
speakers.
I PCM (Pulse Code Modulation)
PCM is a signal format under which an analog audio signal
is digitized, recorded and transmitted without using any
compression. Therefore, PCM may be called the liner PCM
compared with the compressed audio signal such as Dolby
Digital or DTS. This is used as a method of recording CDs
and DVD audio. The PCM system uses a technique for
sampling the size of the analog signal per very small unit of
time. PCM which stands for "pulse code modulation" means
that an analog signal is encoded as pulses and then
modulated for recording.
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