A CD player with buffering - Page 1
Forum section: electronics / general

author: magic
author_rank: Super Contributor
timestamp: February 27, 2019, 10:37:31 am
content: I very much like this thing because it actually manages to be true while still being a bullshit product.https://www.psaudio.com/perfectwave-memory-player/QuoteI wholeheartedly agree. Optical media are terrible.QuoteAnd that's a pretty decent solutionHow come no one came up with this idea before?

author: glarsson
author_rank: Frequent Contributor
timestamp: February 27, 2019, 10:51:58 am
content: How do you think portable CD players (Walkman style, discman, etc) work?

author: ebastler
author_rank: Super Contributor
timestamp: February 27, 2019, 10:57:19 am
content: Quote from: glarsson on February 27, 2019, 10:51:58 amIrony detector out of order?

author: glarsson
author_rank: Frequent Contributor
timestamp: February 27, 2019, 11:09:55 am
content: Yes. Had to turn it off as the crazy people (AOC, genderbenders, flat earthers,...) gave false positives.

author: dzseki
author_rank: Frequent Contributor
timestamp: February 27, 2019, 11:16:50 am
content: Why bullsit? Jitter free reproduction is a valid point and it takes some real effort to achieve it. It resembles to portable CD players, so what? Did they claim jitter (by digital means) free playback? No.As to what does this cost is an other question, but if anyone would be hired here to build "premium" CD players, no one would do it for peanuts I am sure

author: wraper
author_rank: Unknown
timestamp: February 27, 2019, 11:24:19 am
content: Quote from: magic on February 27, 2019, 10:37:31 amIIRC relatively cheap portable CD player I had in the past had like 20 seconds buffer, many others had more. The problem with CD-DA is that error correction is far from perfect, so you need to rip CD at least several times to get a perfect bitstream without any errors.

author: dzseki
author_rank: Frequent Contributor
timestamp: February 27, 2019, 11:45:47 am
content: Quote from: wraper on February 27, 2019, 11:24:19 amI had a combined mp3/CD player, the CD part had 45s shockproof the mp3 had 120s. I was suspicious about this because the size factor between CD and mp3(@128kbps popular at that time) was about 10:1. So that does not line up with the shockproof specs. Also buffering 45s of CD would need more than 6MB buffer, that was way too expensive for such a cheap player back in the early 2000s. So I figured they may compressed the music of some sort on the fly when using shockproof mode, although I've never seen it confirmed (and neither saw the 6MB memory chip sitting on the board)

author: ebastler
author_rank: Super Contributor
timestamp: February 27, 2019, 12:07:01 pm
content: Guys, what’s wrong with your reading comprehension and sense of irony? OP knows that this technology is commonplace; the dodgy bit is that the company he linked to is selling it as a great new invention.Hint: Keep an eye out fot those smiley icons...

author: wraper
author_rank: Unknown
timestamp: February 27, 2019, 12:37:44 pm
content: Quote from: ebastler on February 27, 2019, 12:07:01 pmNothing wrong with comprehension. Just mentioning that their super solid state buffer is quite small even compared to much older and way cheaper devices.

author: magic
author_rank: Super Contributor
timestamp: February 27, 2019, 06:18:16 pm
content: It's even worse than "portable players do it".Every single player on the market does it. They need to in order to perform error correction, which works on fixed size blocks of data. There is no way to correct for dirt and scratches without having already read several bytes in advance.This product is bullshit because nobody simply streams bits from the photodiode straight to the DAC as they suggest. That wouldn't even be possible, given thatQuote from: wikiIt's a nonsense written to mislead people who may be used to the way things work in vinyl and have no clue about digital technology.Quote from: glarsson on February 27, 2019, 11:09:55 amI've seen this phenomenon aptly described asQuote

author: David Hess
author_rank: Super Contributor
timestamp: February 28, 2019, 05:08:29 am
content: I will not be happy until they use a sonically clean mercury delay line for buffering.

author: Buriedcode
author_rank: Super Contributor
timestamp: February 28, 2019, 03:23:50 pm
content: Quote from: David Hess on February 28, 2019, 05:08:29 amThat's more like the Dodgy technology we know and love! But yeah, someone let the marketing team loose on really quite ancient (but still clever!) tech.