Re: CD's, C64's and error-correction

From: Marko Mäkelä (
Date: 1999-10-17 18:49:48

On Fri, 15 Oct 1999, Martijn van Buul wrote:

> Using one stop bit could cause problems when there's a (long) series
> of $FF-data. CD-players (like every audio device) have a high-pass filter
> as well.

True, but remember that the maximum non-filtered output frequency from the
CD is only 22050 Hz (with a sequence of two alternating output values).  
I don't believe that any CD will damp this frequency seriously (say, more
than 50 percent).  If the minimum and maximum output value are used, the
signal ought to be strong enough.  But the TTL convertor circuit should be
designed so that it will work with a reasonably wide range of signal
amplitude, so that it'd work also with players that only have a headphone 


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