Re: Detecting a waveform at arbitrary positions and scales

On Feb 20, 12:05 am, Randy Yates <ya...@xxxxxxxx> wrote:
Eric Jacobsen <eric.jacob...@xxxxxxxx> writes:
On Thu, 19 Feb 2009 14:02:50 -0500, Randy Yates <ya...@xxxxxxxx>
wrote:

Given a reference signal r(t) defined over the interval T1 < t < T2,
what practical algorithm can be used to detect A*r(B*t + C) in a given
input signal x(t), where A, B, and C are unknown?

Do you really mean that B scales time t?   So that B = 0.5 make r(t)
last half as long as when B = 1?

Yes, that's right Eric.

If so, that sounds like a potential wavelet application depending on
the properties of r(t).

Could be.

As I said, this is a major class of problems, known as registration
and/or template matching.The nature of the solution depends on the
nature of the problem, the nature of r, and on what you know about the
signal in which it is embedded, about which you have said nothing.
There is no clean, one-size-fits-all solution to such problems. There
is a large literature, much of which you can access for free on the
Internet.

Now, I notice that you have an 'I-am-irritated-and-sarcastic-because-I-
know-it-all-but-for-some-unknown-reason-I-find-myself-forced-to-ask-
the-lunks-on-this-newsgroup-for-help-and-I-find-that-somewhat-
humiliating' attitude going on. I also notice that you work for a
company providing digital signal processing 'solutions'. How many of
the services needed to run your company are provided to you for free?
Do you provide your 'solutions' for free?

illywhacker;
.

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