Toshiba RD-XS55KU Owner's Manual page 57

D /M1, D /M2
Sound recording format onto DVD-RAM discs. When
recording, sounds are converted into digital signals
and compressed. In playback, they are extracted to the
original sound. The standard differenciates D /M1
and D /M2 in data volume to use. D /M1 and
D /M2 are applied the digital recording technology
for consumer products of Dolby Laboratories. Dolby
Digital 192 kbps is set for D /M1 and Dolby Digital
384 kbps for D /M2.
L-PCM (Linear PCM)
Sound recording format, like Dolby Digital. However,
sounds are converted into digital signals and recorded
as they are without compression. This process
requires more data than Dolby Digital.
57