Grrrrr - a half hour of writing a reply and it gets erased because the site logged me out by itself.
Will go eat dinner and write it again in Word to post later or tomorrow. In the meantime....
``Paperback'' books also often came out on FD's as well, i.e. extremely popular titles with a limited shelf life e.g. pop fiction, dime novels and romance titles that were printed in the millions.
Due to the limited shelf life of those types of titles - meaning they weren't exactly Ibsen or Shakespeare - it wasn't worth the added expense to make RD's and the big orange cases when you could just run off a million FD's, stuff em in an envelope and send em out. Other than a token few copies to have on reserve at the State Libraries for copying to cassette later - as noted in the previous thread - lots of these types of ``paperbacks'' are FD-only - or as we said - extremely rare on RD.
But there's a few problems with recording double-speed into the computer or tricking a High Speed cassette dubber into thinking there's another tape in there when you put a CD to cassette car adapter in place of the Play tape which I will detail - among other things - after I stuff my face with Boston clam chowder with garlic and onion and five-cheese tortellini in.
Ah - text saved in browser by one of the Windows Accessibility Options - a wonderful invention.
So I'm back from making sure my belly still has it's own area code and can continue.I have 2 cases of 8 rpm flexidisc records.
By ``cases'' I assume you actually mean ``envelopes''.
As stated previously - they are probably some sort of magazine, newspaper or other periodical.
However, so-called `paperback' books were also produced in the millions on FD.Problem: nothing to play them on.
I so wish I could find a 8 rpm player.
I have ask searched and have never seen one for sale.
For the reasons stated in the earlier thread - in case of Federal Government legal affairs coming and sniffing around - nobody at places like eBay or the ham-radio/electronics swapmeet at the junior college once a month wants to be bothered with trying to keep abreast of which players were sold outright through AFB and its' licensees and which were strictly loan-only through NLS.I have no clue what is on the disk at all.
Every FD will have a large-print label on the even side and a Braille marking on the odd side, the same as on RD's and TB's. If you have sight enough to make out the even-side print, you could probably discover the title that way, or if the disc is still in good enough shape, the Braille on the odd side should also be discernible with a little effort.
The trouble with doing the double-speed transfer the CONVENTIONAL way with CONVENTIONAL equipment as seen in this video: http://www.youtube.com/watch?v=HnjuBZ1qVsU
- where the bass response is almost non-existent - is partly the lack of the necessary extended frequency response in the cartridge, and partly because of the standard conical or elliptical stylus commonly used to track the disc.
Slightly correcting what was said above - in fact even playing
the 8 RPM flexidisc at the correct speed of 8 RPM using a normal 0.7 mil conical or elliptical stereo LP stylus will damage the disc to a certain extent just by itself - because the grooves are 0.5 mil vs 0.7 mil - tantamount to playing a stereo LP with a 1.0 mil mono stylus. Secondly - playing the 8 RPM disc at 16 will in fact cause a great deal of information to be lost, nevermind playing it at 33.
In addition, the trouble with using a crystal cartridge - as seen in the video above - is that crystal cartridges rarely go below 40Hz or so. Doubling that to 16 RPM means the low end drops off at about 80Hz - therefore virtually no bass response - as you can hear once the guy takes his video to half in a video-editing program.
A few ways to combat this problem and minimize damage to the disc are:
1. Find a magnetic phono cartridge, either Moving-Magnet or Moving-Coil which has `DQ' stylus availability, order the DQ stylus and replace the conical or elliptical it came with. This type of stylus was developed originally to be able to retrieve the supersonic demodulation tones and program material for the Carrier-Discrete 4-channel (CD-4)
quadraphonic records produced for a few years in the early-to-mid `70's.
Due to its' unique shape, this type of stylus is able to ride deeper into a narrower groove without damaging it. In addition - as most if not all RD and TB players featured conical styli - that unlike this reporter - DQ styli being taller and thinner - can ``ignore'' previously-worn portions of the groove - such as that read - and worn out by - a common conical stylus - allowing ``fresh'' or ``previously unused'' portions of the groove to be read - thereby improving the sound considerably. Other names for this type of stylus include Tetra-Hedral, Nude-Square-Shank-Hyper-Elliptic, Micro-Ridge, Fine-Line, Groove-Hugger, or Shibata, named after the original developer in Japan.
2. Couple that with the accompanying CD-4 type cartridge will at least ensure that your 16 RPM transfer of an 8 RPM disc results in a full-fidelity result and not the ``tinny'' sound heard on the later players. This is due in part to the fact that the usable `flat' frequency response on a CD-4 cartridge extends well beyond the range of human hearing, both on top, where the range extends out past 50 Khz, as well as on the bottom where the range often extends down below 10 Hz.
3. In addition to the problems discussed above, transferring at 16 RPM directly into the computer and halving the speed digitally is not advised either due to excessive digital artifacting. The sound editing program has to continuously extrapolate and interpolate the material and create approximations of millions of samples that are not there - and the result can be plainly heard upon final mastering to CD.
So, unless you have either one of those digital mastering suites that the record labels have that can spit out the digital samples at a slower rate than they were recorded at (sort of the reverse of a conventional high-speed CD burner) or else you can change the header of the digital file so that it will play back at half the rate - the result is usually not sufficient for even home listening.
However, taking a normal 16 RPM turntable, attaching it to a variable power source and dialing the voltage down to half, will more or less produce the same result - at least if you can keep the speed steady since quartz-lock will not work at half speed as you will hear in this video: http://www.youtube.com/watch?v=13bTMRtGOaA
. In addition, this will have the additional bonus of being able to be captured in full-fidelity without the need for digital trickery as seen here. Be cautious however when performing this step. Many turntable motors will draw excessive current at such a low voltage, and you may result in your turntable motor being burned-up if you are not careful.
The other way you can get an acceptable transfer is to use the DQ stylus in a CD-4 cartridge as described above, and either put a GOOD CD-to-cassette adapter in the PLAY side of a High-Speed twin-transport Cassette-to-Cassette deck, a Chrome or Metal tape in the RECORD deck - set the Dolby to ON, the EQ and tape type to Chrome/Metal and record at the HIGH SPEED setting. Upon playback, turn the speed select, Dolby off and the EQ and tape settings back to NORMAL and record the TAPE into the computer, Then run your de-hiss, de-crackle and other algorithms on that. Or - do the same thing on a reel-to reel for better results - again using high-bias reel tape and playing back with the bias set to low.
The rest of your questions regarding why rural areas were not as well served by RD's and FD's have been answered by other posters.