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Re: How to slow down noisy CDROM
- To: Linux-Il Mailing List <linux-il(at-nospam)cs.huji.ac.il>
- Subject: Re: How to slow down noisy CDROM
- From: Schlomo Schapiro <schlomo(at-nospam)schapiro.org>
- Date: Sat, 2 Dec 2000 23:06:07 +0200 (IST)
- In-Reply-To: <20001201191200.A369@leeor.math.technion.ac.il>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
Hi,
thanks for the ideas, but I really was looking for a way to tell the CD to
read the data slowly :-)
The point is that like this I can just cd into the CD and play the music
without a big hassle, and I know that for Win there is such a program
(called CD-Bremse) and I was just thinking that it might exist for Linux,
too.
Schlomo
Sincerely,
Schlomo Schapiro
---
email: schlomo@schapiro.org
WWW: http://www.schapiro.org
On Fri, 1 Dec 2000, Nadav Har'El wrote:
> On Fri, Dec 01, 2000, Schlomo Schapiro wrote about "How to slow down noisy CDROM":
> > Hi,
> >
> > does anybody know how to slow down a noisy CD ? I use it mostly to play
> > MP3s and the vacuum cleaner noise doesn't fit the music (and the CD would
> > be still fast enough if it would run at 4x instead of 36x).
>
> Another solution is to cache the music: if your CD player can read at 20x
> speed (I don't believe the manufacturer's data to represent anything of
> relevance to the truth ;)), then you can read 15 minutes of music in 5
> seconds (quick calculation: mp3 is about 10 times smaller than raw CD data,
> 20x makes you able to read data 200 times faster than it will play later).
>
> So you can write a small script which, every 15 minutes, reads the next
> 15 minutes of music from the CD onto the hard disk. It will only be 5
> seconds of noise every 15 minutes (even if it's 10 seconds, it's not too
> bad - if the drive needs to seek (the music is not contiguous) it will take
> somewhat longer, but still not too bad). If you want you can do other
> varients on this idea: e.g., if you have 100MB free space on your harddrive
> you can read 100 minutes of music from the CD (this will take 30-60 seconds,
> I think), once every 100 minutes. Given enough disk-space you can even copy
> the entire CD (650MB) to the hard-disk and play the music from there.
>
> By the way, there's a commercial mp3 player that takes this approach for
> somewhat different purpose: that player has a 10 GB hard disk to store
> *tons* of music, random access and rewritable. However because it is a
> portable player, the hard disk is problematic if it spins continuously -
> it wastes a lot of energy and it can be damaged by too-violent motions.
> So what they do is have a memory cache of, say, 4MB that holds 4 minutes
> of music. The drive has to be spun up once every 4 minutes, the 4MB of
> data is read in a couple of seconds, and the drive is spun down. The
> player can (in theory - I don't remember the implentation details) choose
> an appropriate time to read from the hard-disk using motion sensors, and
> if a read fails it can retry a while later - while still playing what it
> has left in the 4-minute buffer.
>
>
> --
> Nadav Har'El | Friday, Dec 1 2000, 5 Kislev 5761
> nyh@math.technion.ac.il |-----------------------------------------
> Phone: +972-53-245868, ICQ 13349191 |Cigarette: tobacco wrapped in paper,
> http://nadav.harel.org.il |fire at one end, and a fool at the other.
>
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