Long playing times on CD

[pastoralguy]

There are better reasons!

Oh I'm not going to LISTEN to it!

I just want to see if it mis tracks at the end...

[Eine Alpensinfonie]

Oh I'm not going to LISTEN to it!

I just want to see if it mis tracks at the end...

If it's extended time is due tightening the pit spiral, would the end be any more likely to mistrack than any other part?

[pastoralguy]

If it's extended time is due tightening the pit spiral, would the end be any more likely to mistrack than any other part?

I'll let you know...

[Gordon]

If it's extended time is due tightening the pit spiral, would the end be any more likely to mistrack than any other part?

Yes, because that's where all the tolerances are challenged. Whilst CD is "digital" a lot of its processing at the disc surface ie the laser optics, servos etc is analogue.

If the disc is free of blemishes, perfectly flat with no eccentricity [ie centre hole exacty on the centre of the spiral] so that the servos are not greatly challenged then perhaps the tighter spiral would be tracked well. Add in the laser aging and another erosion is present. As those physical factors are eroded then the risk of mistracking increases.

There is however an optical property of the playback lens system, its Numerical Aperture, that is defined in the red book to be 0.45 which is small so that the depth of field is also small. That requires the servos to keep the disc surface and the lens at a near constant distance apart and also move as the track moves vertically and radially beneath the lens. This NA means that the optical system will not allow the track pitch to be tightened too much.

The reading laser spot is not a spot like a searchlight but more like a diffraction pattern whose shape is defined by the laser wavelength and is designed carefully so that, normally, adjacent tracks are not illuminated and will not contribute some unwanted reflected light. If you change the track pitch without altering the optics then those adjacent tracks will contribute scattered light and so interfere with the wanted reflections. Whilst the track pitch can be changed the optics in the player cannot. So a small track pitch change is tolerable but not a large one.

[pastoralguy]

[QUOTE=pastoralguy;561947]

This morning I took delivery of Bruckner 3


I've ordered this cd out of sheer curiosity!

Let's see how it performs on my various machines. :smiley

I've just popped this cd into my player. I must say, it's very well played, IMHO. Yes, it's quite slow compared to Szell with the Clevelanders but that's no bad thing.

I like the cathedral acoustic as well which, to my ears, suits the music. I was amused by the photo of the conductor standing at the back of a tram.

[Beef Oven!]

[QUOTE=pastoralguy;563571]

I've just popped this cd into my player. I must say, it's very well played, IMHO. Yes, it's quite slow compared to Szell with the Clevelanders but that's no bad thing.

I like the cathedral acoustic as well which, to my ears, suits the music. I was amused by the photo of the conductor standing at the back of a tram.

[Eine Alpensinfonie]

Has anyone crammed Mahler 3 on to a single audio CD?

[Bryn]

Has anyone crammed Mahler 3 on to a single audio CD?

Not on a commercial CD, but certainly on CD-R. It's become standard procedure of me to rip the commercial CDs of Mahler 3 that I buy and write them to single over-burn CD-Rs for convenient playback without changing discs.

[pastoralguy]

Has anyone crammed Mahler 3 on to a single audio CD?

And if not, WHY not?!

If this cd proves anything it's that it is possible. I feel a letter to Gramophone or Hi-Fi News coming on...

[Bryn]

And if not, WHY not?!

If this cd proves anything it's that it is possible. I feel a letter to Gramophone or Hi-Fi News coming on...

While it is possible to fit up to around 99 minutes on a CD, it is a risky option and does not fall withing the Red Book specification. For instance, in order to use the capacity of an over-burn CD-R (90 minute and 99 minute versions are available), specific software, such as Nero Burning ROM, is required, and in advance of burning that software warns of potential damage to burner and/or player if they are not up to the job. While I have never yet encountered a problem playing the over-burn CD-R I have written to, I have encountered writers which were not compatible with over-burn discs. If extended play glass mastered CDs were marketed, the vendors would need to warn of the potential dangers of playing them.

[pastoralguy]

Interestingly, my Quad 'Elite' CD player had no problem with it. Neither has my PURE radio/CD player or the ROBERTS player in the kitchen. Mind you, all three are recently technology.

[pastoralguy]

One of the CDs in the Zubin Mehta set on Decca that I've been kindly lent runs for 80' 00". Three Schubert symphonies. 1, 3 & 8.

Fine recordings. I'm really enjoying this set.

[Bryn]

The new Harnoncourt LvB Missa Solemnis comes in at just over 81' 31", of which the last 13 seconds or so are silent run-out. For those downloading at CD data rate, this means that it will probably not quite fit on a standard 80 minute CD-R using over-burn software with a compatible burner. However, shaving off 10 seconds of that 13 second run-out with a basic audio editor should just about do the trick.

[Bryn]

A question regarding the Dark Matter of editing a live recording to fit it within the standard playing time limit of an '80 minute' CD. Member Barrett's work of that title is to be found on an NMC CD. Some unaccompanied section of Beckett's text were edited out from the live recording. Perhaps Richard might let us know the duration of those edits? Just wondering whether the uncut version might have been squeezed into, soy, 82 minutes.