5 Nov
2004
5 Nov
'04
7:28 a.m.
Gang - Any tips/pointers appreciated. I have some cassette tape
audio files using 300 baud 8/n/1 format simple fsk 1200/2400Hz
I think. Same audio you would find on a cassette tape for program
storage except in a wav file. Any easy way to demodulate it back into
data? Something like a software (mo)dem that can read the audio file
and create the contents?
Otherwise I will have to type the program in again (yuck) or
read it into the old machine and rig up a serial interface
to transfer it to a new PC running a simulator (more fun but
would rather just extract it directly).
Thanks
--Chuck
5 Nov
5 Nov
7:41 a.m.
Chuck:
You may want to look at Jim Battle's SOL emulator project
(http://www.thebattles.net) for inspiration. I haven't looked at the code
recently, but IIRC it has a software-based method for demodulating WAV
files.
Rich
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org]On Behalf Of cswiger
Sent: Friday, November 05, 2004 1:29 PM
To: cctalk(a)classiccmp.org
Subject: demodulating audio cassette wav files
Gang - Any tips/pointers appreciated. I have some cassette tape
audio files using 300 baud 8/n/1 format simple fsk 1200/2400Hz
I think. Same audio you would find on a cassette tape for program
storage except in a wav file. Any easy way to demodulate it back into
data? Something like a software (mo)dem that can read the audio file
and create the contents?
Otherwise I will have to type the program in again (yuck) or
read it into the old machine and rig up a serial interface
to transfer it to a new PC running a simulator (more fun but
would rather just extract it directly).
Thanks
--Chuck
8:26 a.m.
Thanks Rich - I found something there called a "virtual tape drive"
but it appears to store and read data from ascii files (just slowed
way down to simulate the Real Thing ;).
I'm enjoy his site tho - lots of software to look at, which is what
my audio file project is all about.
--Chuck
On Fri, 5 Nov 2004, Richard A. Cini wrote:
Chuck:
You may want to look at Jim Battle's SOL emulator project
(http://www.thebattles.net) for inspiration. I haven't looked at the code
recently, but IIRC it has a software-based method for demodulating WAV
files.
Rich
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
6 Nov
6 Nov
5:45 p.m.
Richard A. Cini wrote:
Chuck:
You may want to look at Jim Battle's SOL emulator project
(http://www.thebattles.net) for inspiration. I haven't looked at the code
recently, but IIRC it has a software-based method for demodulating WAV
files.
Rich
my sol emulator has virtual tapes and a virtual tape player. i've
wanted to write a really good tape decoder, but it hasn't been high
enough priority to displace other projects.
Ed somebody in australia wrote a kansas city/cuts decoder/encoder
program. I was able to get the thing to decode the tape waveforms that
it generates, but I've tried a few real Sol tapes and I can't get them
to decode. I sent Ed a sample and he said something along the lines of
"I can decode the tapes I generate, so there is probably a problem with
your tape." well, in the real world, these tapes do have problems, so
the value is in being able to decode even poor tapes.
5 Nov
5 Nov
7:45 a.m.
cswiger wrote:
Gang - Any tips/pointers appreciated. I have some
cassette tape
audio files using 300 baud 8/n/1 format simple fsk 1200/2400Hz
I think. Same audio you would find on a cassette tape for program
storage except in a wav file. Any easy way to demodulate it back into
data? Something like a software (mo)dem that can read the audio file
and create the contents?
If this is a CUTS format tape (aka Kansas City format), then I can
suggest this page:
http://www.alphalink.com.au/~edsa/
where there's a link to an MS-DOS program to do exactly what you want.
I heard from a UK101 user recently who had success with this program
by running it under 'dosbox' in Linux.
--
John Honniball
coredump(a)gifford.co.uk
8:53 a.m.
On Fri, 5 Nov 2004, John Honniball wrote:
cswiger wrote:
Hi John - Yes, the good news is that's what I'm looking for.
The bad news is my tapes are not CUTS format. However, the good
news is it comes with sources. The bad news is it's in FORTH!
The good news is I like hacking FORTH (Just finishing up a board
game that plays in a Sun Open Boot Prom machine w/o Solaris ;)
but this is over my head (bad news).
Anyway I might have to look at writing something in gcc that
can detect tones and demod, make a project out of that. Just
checking to see if someone has already invented that particular
wheel.
Audio is from the Altair 88-ACR.
--Chuck
Gang - Any tips/pointers appreciated. I have some
cassette tape
audio files using 300 baud 8/n/1 format simple fsk 1200/2400Hz
If this is a CUTS format tape (aka Kansas City format), then I can
suggest this page:
http://www.alphalink.com.au/~edsa/
9:01 a.m.
On Fri, 5 Nov 2004 13:28:51 -0500 (EST), cswiger <cswiger(a)widomaker.com> wrote:
Gang - Any tips/pointers appreciated. I have some
cassette tape
audio files using 300 baud 8/n/1 format simple fsk 1200/2400Hz
I think. Same audio you would find on a cassette tape for program
storage except in a wav file. Any easy way to demodulate it back into
data? Something like a software (mo)dem that can read the audio file
and create the contents?
Otherwise I will have to type the program in again (yuck) or
read it into the old machine and rig up a serial interface
to transfer it to a new PC running a simulator (more fun but
would rather just extract it directly).
Thanks
--Chuck
What machine is it for, I know of a few programs that can do this but
they are machine specific. Is there not an emulator which will except
a wav or converted file ?
Dan
11:41 a.m.
I have some cassette tape audio files using 300 baud
8/n/1 format
simple fsk 1200/2400Hz I think. Same audio you would find on a
cassette tape for program storage except in a wav file. Any easy way
to demodulate it back into data?
Sounds as though it should be simple enough, unless the digitization
sample rate is really marginal (8KHz would be pushing it, I'd say). If
you don't mind sending me a fragment of the digitized audio, I can have
a stab at it.
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