Re: CiderPress v2.1.0 released

[Andy McFadden <fadden@fadden.com>]

Michael J. Mahon <mjmahon@aol.com> wrote:
> My experience with "published" cassettes is that many of them had
> non-standard tape azimuth alignment, causing significant high frequency
> rolloff when played on a properly aligned deck.
> 
> The solution was to get out a small screwdriver and individually adjust
> the alignment for each tape, peaking the high frequencies.

The amplitude of the 2KHz '0' cycles tends to be less than half the
amplitude of the 1KHz '1' cycles on Softape cassettes.  It's not uncommon
to get batches of 0s that have been pushed up above the zero line, which is
why I'm providing an alternate algorithm that measures distances between
peaks instead of zero crossings.  (Of course, figuring out what a "peak"
is can be a lot of fun on some of these things.)  The high-frequency
effects get even worse for the "short 0" half-cycle that's supposed to
start things off... if you miss that, you catch the second half of the
cycle (which is a "regular" 0), and can end up off by half a cycle,
which doesn't work out very well.

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