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From: strong@tc.fluke.COM (Norm Strong)
Newsgroups: sci.electronics
Subject: Re: Digital recording on a VCR
Message-ID: <14417@fluke.COM>
Date: 30 Jan 90 19:50:19 GMT
References: <21254@siemens.siemens.com> <15880005@hpfinote.HP.COM>
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In article <15880005@hpfinote.HP.COM> maj@hpfinote.HP.COM (Mike Jassowski) writes:
}/ hpfinote:sci.electronics / henry@utzoo.uucp (Henry Spencer) /  9:46 am  Jan 18, 1990 /
}>In article <13400@cit-vax.Caltech.Edu> toddpw@tybalt.caltech.edu (Todd P. Whitesel) writes:
}>>me and a friend have wondered how tough it would be to record a stream of
}>>digital pulses on a vcr tape and play them back (i.e. cheap HD backup, speed
}>>doesn't really matter). We tried putting the serial port though an op-amp
}>>and recording it on cassette tape, however we had some trouble...
}
}I had some luck recording digital on audio tapes.  I had to modulate the
}digital information.  Audio recorders have trouble with DC; if you have 
}several ones/zeros in a row, it starts to look like DC.  A little filtering
}the output restored the informtion.
}>
}>VCRs are not like audio recorders; they know that their input is a video
}>signal and tinker accordingly.  (For example, as I recall, they record sound

You could buy a Toshiba DX-900.  It has built in digital audio
capability.
-- 

Norm   (strong@tc.fluke.com)