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use red laser, allows for smaller tracks;
pitch meaning more data can be fit in the same surface area,
capacity 4.7 GB, data rate is variable |
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| essentially two disks on top of one another, two different lasers, one passes through top, only sees bottom |
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| single sided single layer |
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Definition
| double sided, 1 layer 1 sided (players switch from layer to layer... slight pause) but does not switch sides |
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Definition
2 chanel pcm
audio- 16 bit 96khz
only supports 48 and 96k, not 44.1 or 88.2
-dolby digital ac-3 soundtrack containing 1 to 1.5 channesl up to 44.8 kbps bit rate
optionally can contain DTS sumend up to 1.4 mbps |
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Definition
| rests of the bit rate dedicated only to video, the increasted audio quality = the decreased pic quality |
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| meridian lossless packing (mlp) |
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Definition
an optional lossless data compression must be used for 24 bit/96khz 5.1 can be used to increase playing time or other formats (roughly 2.1 compression)
7mbps with MLP=420mb per min or 52 MB per minute.
(90 minute playing time)
**most dvd single layer** |
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Term
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Definition
dvd based created by sony/phillips as a proposal for dvd-audio
stereo for 5.1 usually single layer and cd layer hybrid;
contains no video content at all, not even menus. encoded in direct streams digital or DSD, direct recording of the output of sigma delta modulation converter
-1 bit sampling at 1.8mhz
-sigma/delta modulation converter |
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Term
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Definition
process of using reflected light to read data off a surface usually a disk
-not limited to digital data only
-refelcted light from the source returns at varying intensity due to changes in the surface. these different intensities are converted to a varying voltage. |
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Definition
| two different light intensities are needed. |
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| optically stored analog video/audio later adapted for digital audio with analog video |
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| cd was designed to be analog.. |
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Definition
| but was switched to the digital design. |
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| determines the data rate bandwidth. smaller wavelenght lasers can focus on a smaller area allowing data to be closer together on the disc. |
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Cds- green lasers- 750mB
dvds- red lasers- 4.7 gb
blu-ray-blue lasers - 50 gb |
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Term
| cd developed by sony/phillips in late 1970s, phillips developed optical storage system. |
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Definition
| in late 1970s, phillips developed optical storage system.. sony developed digital pcm audio system |
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Term
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Definition
| width of the track of data running spirally from the center out. standard 1.6 micrometers |
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Term
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Definition
| how fast the track passes over the laser as if the track were in a straight line |
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| constant linear velocity (clv) |
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Definition
| the linear velocity remains constant throughout the entire disc to accomplish this the disc needs to spin slower when the laser is reading the outer edge |
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Definition
| are stamped mechanically so the data track is physically created in a material |
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Term
| recordable/rewriteable discs |
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Definition
| data is contained in a layer of material that can be altered by applying a laser to it creating two different reflections mimicing pits/lands |
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Term
| magneto optical storage minidiscs |
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Definition
| combines laser and magnetic recording, level of mag. field needed to change a mag. medium is temporary dependent. a material only magnetically coered at high tempurature is placed in the constant mag field. a laser is used to raise the temp. of a small area in the medium until it reaches the temp. where it can be magnetically altered. accidental erasure nearly impossible . can hold more data than magnetic medium |
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