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invent by philip in 1973 to springboard michael jackson to stardom the compact disc (or “CD”) is a round disc 100mm in diameter which has shiny pits that represent ones and zeros these ones and zeros encode data and that data encodes music. block rockin beats. this was called black book later they realised you could encode other data onto these discs and they call that yellow book then at some stage they made it so CDs could be made of plastic and you could zap them with a laser and make your own. this was good for stealing music and games all in all CDs are round. then they made DVD. then HD-DVD. then the playstation 3 I think.
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Jan 24, 2024 03:18
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post hole digger posted:do you like cds echi? ye man
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Jan 24, 2024 05:19
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Dijkstracula posted:
which one was brown book
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Jan 24, 2024 23:31
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the digital audio standard is called the red book (and the SACD format is the ~scarlet~ book because it's fancier audio 
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The Management posted:thats not exactly true, there’s also to 8-to-14 decoder and the time codes. but still basically no ram required. the parallel port of digital music so as opposed to this, what’s a sector on a hard disk, in a physical sense? are hard disks rings? on vinyl it’s a constant rate of spin so do the outer tracks carry more information? and similarly how to digital media deal with this? bits at max squash at the mid and less at the outer? or some fancy technology that compensates for this ?
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Jan 25, 2024 20:20
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akadajet posted:do kids like cds over records? I feel like records are neater from a kid perspective. the primary benefit of vinyl, and nothing will surpass this until it does, is that the album art is BIG
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Jan 27, 2024 06:59
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next you’ll be telling me people enjoy live music
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Jan 27, 2024 19:20
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The Management posted:no loving clue thankyou for this sick as gently caress insight
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Jan 27, 2024 23:39
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I had a video ipod and me and exwife took it on overseas holiday and I only had harold and kumar go to white castle so we ended up watching that movie at least a dozen times
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Jan 29, 2024 03:26
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on that tiny fuckin screen
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Jan 29, 2024 03:27
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it fascinated me how they worked out how to put sound between songs like you couldn’t skip to it, but it wasn’t part of the previous track. you had to go to the previous track and let it go past the end to hear it
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Jan 29, 2024 07:07
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also things started happening as far as song length and time goes etc on dark side of the moon or wish you were here the original vinyl just lists the songs in order but when they made the cd they had to put a stake in the ground as far as when one song starts and another finishes also on copies of reign in blood they hosed up the start of raining blood and put the end of postmortem as the start of it so you get videos of kids playing along to raining blood but starting with the end of postmortem hahahahah classic funy times
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Jan 29, 2024 07:10
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I think anyway . lol
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Jan 29, 2024 07:11
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graph posted:are audiophile morons still paying $$$ for gen 1 ps1s my 14 yo tells me “dad your ps1 can play cds!” and i’m like “i know  ”
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Feb 1, 2024 00:56
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The Management posted:CDs were designed to be read by extremely simple ASICs with basically no compute power. like I said, they’re basically phonograph records with digital encoding. this is sick
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Feb 1, 2024 00:56
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am I remember correctly that there were multiple kinds of RW cds that weren’t compatible
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Feb 1, 2024 09:29
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with cd rom did that have much more redundancy and whatever compared to the phonograph nature of audio cd and I spose DVD is just a new Cd
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Feb 1, 2024 09:31
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The pits and lands do not directly represent the 0s and 1s of binary data. Instead, non-return-to-zero, inverted encoding is used: a change from either pit to land or land to pit indicates a 1, while no change indicates a series of 0s. There must be at least two, and no more than ten 0s between each 1, which is defined by the length of the pit. This, in turn, is decoded by reversing the eight-to-fourteen modulation used in mastering the disc, and then reversing the cross-interleaved Reed–Solomon coding, finally revealing the raw data stored on the disc. These encoding techniques (defined in the Red Book) were originally designed for CD Digital Audio, but they later became a standard for almost all CD formats (such as CD-ROM). c cool
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Feb 1, 2024 09:39
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yes who isn’t rn
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Feb 1, 2024 19:08
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is there a formal difference between disc and disk my mum used to call my 3.5” floppies “tapes” and tbh they are just a big flat round tape cds are not tapes tho
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Feb 2, 2024 01:27
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cds are great tho like they worked out how high frequency we can hear. doubled it for ny good reason and 16 bits.. it’s a sufficient number of bits like, back in fuckin rotors day they nailed it from a practical point of view cd audio is about as good as it can get on vinyl did they ever do parallel tracks? like imagine if you let the record play and it played some track but if you put the needle there you could sometimes get a different track? also remember when cds could store track names ? cool imo they should do a retro cd player and you put the cd upside down and the laser instead of being on a screw it’s on a swing arm like vinyl. now that would be sick playstation cds we’re black. is that how it knew they were legit
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Feb 2, 2024 01:35
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polyester concept posted:disc is optical and disk is magnetic what about vinyl co that’s neithe hang on Im looking this up and seems like you’re making it up
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Feb 2, 2024 02:13
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herniated disc or disk? depends if magnetic or optical
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Feb 2, 2024 02:13
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now that’s the kind of poo poo that I love
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Feb 5, 2024 03:22
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The Management posted:CD ROM dedicated 256 bytes out of every block (2304 bytes) to error correction data. the cross-interleaved reed-solomon encoding ECC made them very resilient to clustered errors. this means that they are very good at recovering from errors caused scratches on the disc surface, even if the scratch is parallel to the track path. seems like back in the day when data space was more scarce they made all sorts of good engineering decisions The Management posted:they doubled it for a very precise reason, the Nyquist–Shannon sampling theorem, which is a fundamental rule of digital sampling. it basically says you can perfectly encode any analog signal if you sample it at twice the maximum frequency. I slipped a wee typo into my post on purpose 
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Feb 8, 2024 20:34
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cd is the analog of digital
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Feb 10, 2024 20:18
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the thing that seems very cool about cds is they seem a bit “hackable”, like people learned to abuse them a bit, for example tracks before track 1, you could only access by rewinding and some players couldn’t do it and the management basically letting us know that they really are the analog of digital. a big gently caress off wav file remember when cd players became capable of reading mp3 off of cd rom? that was cool in a way but I prefer knowing the cd player is doing gently caress all computing
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Feb 11, 2024 06:39
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and they were invented way earlier than I ever imagined was possible :woah:
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Feb 11, 2024 06:40
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Feb 11, 2024 06:41
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ears are burning someone’s talking poo poo about cds
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Feb 12, 2024 00:50
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Zlodo posted:there's also this: https://www.instructables.com/Burning-Pictures-on-a-Compact-Disc-Surface/ poo poo that rules
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Feb 12, 2024 19:40
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bullshit I saw it and it was black :foldarmsemoji: was the blackness part of the drm
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Feb 13, 2024 19:42
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| # ¿ Sep 7, 2024 21:40 |
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there was something they did to make copying them difficult tho right I had my ps1 mod chipped so it could play my backups
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Feb 13, 2024 20:27
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