Messages in this thread | | | Date | Mon, 14 Sep 1998 17:53:39 -0500 (CDT) | From | Chris Zwilling <> | Subject | Re: NEWSFLASH! Linux ported to Commodore VIC-20!! |
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On Mon, 14 Sep 1998, Peter Monta wrote:
> > Hm, 3 kbit/sec. Soundcard/tape has high SNR and is quite linear; one > could use some V.34-like QAM/TCM scheme but at a higher symbol rate. > If V.34 can get 30 kbit/sec from a phone line, surely a tape deck with > 15 kHz bandwidth would roughly quadruple this, giving around 80 MByte > per 90-min tape. Would want to interleave to control dropouts. >
There are many problems with tape. Stretching and speed drift have been touched on. Tape alignment is another one. How about wow and flutter? Then we have abrasion - taking the emulsion right off the tape. If we limited ourselves to one channel on a stereo deck, we could have RAID-1 type redundancy. ;)
Of course we could try a simple experiment. Take a sound sampled from CD. Record it to the tape deck with the sound card (dd if=sample.raw of=/dev/dsp bs=512 count=128). Resample from the tape and compare the results with the original sample (dd if=/dev/dsp of=sample2.raw bs=512 count=128). My guess is that although the files will sound similar the byte differences will be quite large. You can generate some random data by catting /dev/random to a file.
Sounds like an interesting project - I'm going to try when I get home. I have an JVC compact cassette unit that I will try; I'll also try my Akai Reel to reel (That has better sound than CD).
;-----------------------------------------; ; ; Chris Zwilling ; Don't let people drive you crazy ; chris@cloudnet.com ; when you know it's in walking distance ; System Administrator ; ; 320.240.8243 ;-----------------------------------------;
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