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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 08:39
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Got his rear end.
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Feb 1, 2024 08:48
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graph posted:are audiophile morons still paying $$$ for gen 1 ps1s Is the PS1 DAC actually any better than other Sony DACs? Aren’t Sony CD DACs just good in general?
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Feb 1, 2024 13:30
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echinopsis posted:am I remember correctly that there were multiple kinds of RW cds that weren’t compatible
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Feb 1, 2024 14:49
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yes who isn’t rn
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Feb 1, 2024 18:08
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don't forget DVD-RAM
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Feb 1, 2024 21:06
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you can mail a cd for $1.08 in the US as a letter in a cardboard sleeve
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Feb 1, 2024 23:15
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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 00:27
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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 00:35
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disc is optical and disk is magnetic
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Feb 2, 2024 01:05
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polyester concept posted:disc is optical and disk is magnetic
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Feb 2, 2024 01:07
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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 01:13
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herniated disc or disk? depends if magnetic or optical
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Feb 2, 2024 01:13
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lampey posted:you can mail a cd for $1.08 in the US as a letter in a cardboard sleeve fond memories of ordering niche music from europe and just an envelope would arrive, with a cd and booklet, sans jewel case. Think I still have a pile of empty jewel cases somewhere for this reason
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Feb 2, 2024 01:15
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echinopsis posted: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? there was a "three sided" monty python record that did this. and some other examples iirc
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Feb 2, 2024 01:58
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smdh that no one has mentioned pre-gap audio itt
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Feb 5, 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 02:22
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echinopsis posted:with cd rom did that have much more redundancy and whatever compared to the phonograph nature of audio cd 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.
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Feb 8, 2024 17:16
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echinopsis posted:cds are great tho 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.
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Feb 8, 2024 17:24
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Internet Old One posted:Aren’t Sony CD DACs just good in general? no, they suck
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Feb 8, 2024 17:25
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gotta colour in the edges of the CD with your special green marker pen
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Feb 8, 2024 17:30
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post hole digger posted:how about you cds nuts then
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Feb 8, 2024 18:04
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:woot: 
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Sweevo posted:gotta colour in the edges of the CD with your special green marker pen color them in?? I’m using a $$$$ tool to shave them off at a specific angle
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Feb 8, 2024 18:06
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also did you know you can hang a CD from your rear-view mirror and it dazzles speed cameras
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Feb 8, 2024 18:10
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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 19:34
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graph where’s best place to buy needles / cartridges these days I asked in the vinyl thread and they didn’t answer
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Feb 8, 2024 19:55
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Dans Macabre posted:graph where’s best place to buy needles / cartridges these days I asked in the vinyl thread and they didn’t answer if you know what you want, whoever has the best price ?
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Feb 8, 2024 20:16
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graph posted:if you know what you want, whoever has the best price ? Well I wanted shures but they don't make those anymore? I guess I want ortofons then :/
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Feb 8, 2024 23:11
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Dans Macabre posted:I guess I want ortofons then :/ should have wanted orts to begin with 
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Feb 8, 2024 23:15
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best sounding combo i ever heard was a niteclub nana with an elektro tip
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Feb 8, 2024 23:17
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I'm sure I will be able to tell the difference on my $20 headphones
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Feb 8, 2024 23:19
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Dans Macabre posted:I'm sure I will be able to tell the difference on my $20 headphones lol if you're still not using v700s
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Feb 8, 2024 23:20
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Internet Old One posted:You sound smart. What was meant by the “8 times oversampling” that my cd player was so proud of itself for? Basically, it is difficult, and therefore expensive, to build a 16bit wide DAC with accurate voltage resolution using standard ASIC design and manufacturing techniques. It is very easy, otoh, to build one with very accurate temporal resolution. Fortunately, the math of digital signal processing lets you trade one for the other, losslessly. So once it became practical to put enough processing power in consumer CD players, manufacturers used DACs with smaller word sizes at a higher frequency. 8x oversampling means they convert the 44.1khz samples to 352.8 kHz, and run it through probably a 4 bit DAC. You can take this to the extreme and go all the way to a 1 bit DAC, which is trivial to construct, but requires ~256x oversampling. And in the right era, you did indeed see both of those claims used in the marketing of CD players.
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Feb 9, 2024 00:31
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i use cds because im tired of todays hyper-digital fast paced life and try to use old analog formats whenever possible
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Feb 10, 2024 16:45
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George posted:i use cds because im tired of todays hyper-digital fast paced life and try to use old analog formats whenever possible agreed
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Feb 10, 2024 16:46
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cd is the analog of digital
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Feb 10, 2024 19:18
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graph posted:lol if you're still not using v700s i'm still using a set of mdr-v6 headphones i bought off a goon twenty years ago
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Feb 11, 2024 02:28
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echinopsis posted:cd is the analog of digital correct
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Feb 11, 2024 05:20
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I don't have anything to add but want to say this is a good thread and I'm enjoying it, looking forward to some more facts about CDs
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Feb 11, 2024 05:34
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| # ? Dec 6, 2025 15:13 |
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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 05:39
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