anyone know?

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anyone know?

Unread postby monty dan » Sat Apr 26, 2014 7:38 am

I was looking about online and read this
'If the groove speed were held constant instead of the turntable speed (in much the same way that a reel of film plays out at a steady 24 frames a second), it would be possible to record over 90 minutes of material on a single side. You'd have greater fidelity and a lessened potential for damage to the record. A few phonographs designed on this principal were marketed in the early 1900s.'
just wondered if anyone had any info on this? I'd never heard of it before and just wondered how it all worked
cheers
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Re: anyone know?

Unread postby Techie » Sat Apr 26, 2014 12:14 pm

Cylinders, but not 90 minutes.
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Re: anyone know?

Unread postby Techie » Sat Apr 26, 2014 12:20 pm

... and obviously not per side.
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Re: anyone know?

Unread postby Techie » Sat Apr 26, 2014 12:40 pm

Sorry for the multiple posts. Just found this online:

http://forums.stevehoffman.tv/threads/theoretical-question-about-turntable-speed.204430/

It doesn't explain how it was done, but does identify it as World Records. Maybe a rubber roller on the playback arm driving the disc?
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Re: anyone know?

Unread postby monty dan » Sat Apr 26, 2014 1:19 pm

nice. thanks for the link
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Re: anyone know?

Unread postby monty dan » Sat Apr 26, 2014 2:06 pm

incase anyone is interested heres a video of someone playing a world record
https://www.youtube.com/watch?v=vfcZ4vijfV4

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Re: anyone know?

Unread postby Techie » Sat Apr 26, 2014 2:56 pm

Here's another one playing all the way thru. It doesn't seem to make its way to 78 rpm-ish at the end.
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Re: anyone know?

Unread postby Techie » Sat Apr 26, 2014 2:57 pm

https://www.youtube.com/watch?v=s_TW3ns1e1I



Here's the vid of it playing all the way thru.
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Re: anyone know?

Unread postby mossboss » Sat Apr 26, 2014 3:49 pm

Also Philips did produce a turntable back in the 60's with the same principle but it was not taken on by other record manufacturers so it died or it was still born
The principle is applied to CD today as they also need to read a constant "bit rate" so it goes like hell on the inside than slows down on the outside thus maintaining a constant "feed" of bits to the read head
Cheers
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Re: anyone know?

Unread postby Greg Reierson » Wed Apr 30, 2014 4:49 pm

As hard as it is for a modest turntable to keep a steady speed, imagine how difficult it would be to try to maintain constant linear velocity across a record.
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