Re: [chuck-users] stupid n00bie question: Part III

16 Oct 2007

      Joerg, I'll try your method in a week or so, when I have gone past the basic
ontological hurdles.

Kassen...I had to install the latest version 1.2.1.1 to find that tracking
example.
I never realised when that came up! Your various points are very insightful,
but obviously I tried the simplest looking option - the last. I just had to
add a line to
make it work:

<<< Tracking.the_freq >>>;

I am presuming this would be the frequency in Hertz? The mic seems quite
sensitive, I get a
reading of around 64.6 from the ambient noise, mostly traffic from the
nearby road. Hmm....

That's on the wish-list, Ge said it depends on garbage collection because of
the splinters.
Perry commented a while back that woodChucKs might be protected as well so
that
would further complicate matters. Obviously it won't be useful at all until
we have trees
which are generally a form of lists and we don't have lists (yet?).

Yesterday afternoon I was just sitting at my new office/studio, and in my
head battling
out Chuck versus PD, both of which I know very little. I was wondering which
one to
invest time with to get fast results for my current experiment. Then from
the balcony
sauntered in the sound of three kids playing cricket....the fat kid was
scolding one
of the skinny boys.....

"You're chucking!"
"No chucking!"
"That was a Chuck!"

For a moment, I thought it was an Omen.

(PS: In cricket, "chucking" is when you do not complete the circular
follow-through
action while bowling, or bend your elbow weirdly.  Its a form of cheating.)

-------    -.-
1/f   )))  --.
-------    ...
http://www.algomantra.com

On 10/16/07, Kassen  wrote:
...
On 10/16/07, AlgoMantra  wrote:
...
1. What is the simplest way to detect the pitch
of an audio signal (from the mic) in Chuck?
To add to Joerg's sugestion;
Tracking zero crossings is a viable option, it gets used in a fair amount
of hardware but due to it's limitations it tends to work best on simple
signals and such hardware tends to be aimed at specific instruments (say
bass guitar) because it helps if you can make a good guess what range the
ouput should be in. Typically I'd only use zero-crossing for sub-octave
generation.
Another option is a phase-locked loop which comes down to synthesising a
sine, comparing it to the signal to be analysed, look at the difference in
phase, then tweak the sine until this difference becomes as small as
possible. It has some of the same weaknesses but should be more accurate
most of the time, it's less simple.
It kinda depends in what way you want it to be simple; FFT analysis is not
at all simple on a fundamental level but it's simplified considerably if Ge
& Rebecca do all of the hard stuff for you :¬). Have a look at
/chuck1.2.1.1/examples/analysis/tracking/tracking.ck (I think that's your
solution)
2. How much wood could a woodChucK ChucK
...
if a woodchucK could chucK wood?
That's on the wish-list, Ge said it depends on garbage collection because
of the splinters. Perry commented a while back that woodChucKs might be
protected as well so that would further complicate matters. Obviously it
won't be useful at all until we have trees which are generally a form of
lists and we don't have lists (yet?).
;¬)
Kas.
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