[ml] WiiMote sync-up

Jeremy K trochee at gmail.com
Tue Jun 16 15:23:47 PDT 2009


Josh Myer wrote:
> There was a quick aside on how to smooth/sample that data: my thought
> is to place datapoints into buckets of a fixed width, and take the
> midpoint of each bucket.  This requires taking the mean of the samples
> within each bucket.  Then, to smooth in missing buckets, we do linear
> interpolation.  The alternative is to take sample points at the edge
> of each bucket, with some form of interpolation.  My gut feeling is
> that we want to take means because the sensors are noisy, and making
> use of as many samples as possible is beneficial.  We'll see how this
> works out as users change direction (ie: an up-to-right transition
> might fare poorly with this sampling strategy).
>   
smoothing is a good idea. my experience with speech suggests that you
can smooth better doing a sliding window, rather than bucketing --
unless I interpret your use of 'bucket' wrong.  the same sample may
belong to multiple frames, if that makes sense.

the window need not be rectangular; under some circumstances a
triangular window or even a sliding Gaussian makes more sense, depending
on the properties you're trying to capture.

just my $0.02, from a kibitzer who has other Wednesday night regularly
scheduled events.

--jeremy


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