Compact Disc
The Red Book CD specification includes two channels by default, and so a mono recording on CD either has one empty channel, or else the same signal being relayed to both channels simultaneously. However, noncommercial CD's in other formats such as White Book or Orange Book can feature up to four hours of stereo music on one CD for the purposes of extended programming in public spaces, such as malls.
These formats slightly reduce both the sampling frequency from 44.1 kHz as well as the bit-depth frequency from 16-bit and employ other proprietary technologies in order to increase the time on the disc and, as in the 16-inch transcriptions above - render them unplayable on the vast majority of consumer equipment.
Read more about this topic: Stereophonic Sound
Famous quotes containing the words compact and/or disc:
“Take pains ... to write a neat round, plain hand, and you will find it a great convenience through life to write a small and compact hand as well as a fair and legible one.”
—Thomas Jefferson (1743–1826)
“Perhaps all music, even the newest, is not so much something discovered as something that re-emerges from where it lay buried in the memory, inaudible as a melody cut in a disc of flesh. A composer lets me hear a song that has always been shut up silent within me.”
—Jean Genet (1910–1986)