Sound Scaning system

Question

1.67/5 (3 votes)

See more:

Dear Sir,

I desperately in need of help for a module of a sound application system. What this module basically does it to count the number of times a sample extracted from a main sound application occurs in the main.

I'll be grateful for any help offered and will also like to know the cost and duration.

Thanks

Posted 7-Dec-10 3:44am

ikebotch

Updated 7-Dec-10 3:49am

TheyCallMeMrJames

v2

Add a Solution

Comments

TheyCallMeMrJames 7-Dec-10 9:49am

Removed email.

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

TheyCallMeMrJames · Answer 1 · 2010-12-07T03:51:00

Solution 1

You're likely better off hitting a site like vworker.com.

This site and especially this part of the functionality are for software folks to help other software folks with detailed software-folks-like questions.

Cheers.

Posted 7-Dec-10 3:51am

TheyCallMeMrJames

Laurence1234 · Answer 2 · 2010-12-07T04:05:00

Solution 2

Hi ikebotch,

I'm not completely sure but I would say you need to look into Fourier Transform.

If you get the Fourier Spectrum of your sample you can then analyse that against the Fourier Spectrum of the larger sample, looking for any matches. Fourier Transforms can be used when quantising rhythm tracks or for auto-tuning.

There are some open source tools available for Fourier Transforms in C#, however I' not completely sure that my approach would be helpful.

Cheers

Laurence

Posted 7-Dec-10 4:05am

Laurence1234

Updated 7-Dec-10 4:07am

v2

Comments

wizardzz 7-Dec-10 10:49am

Good call.

Laurence1234 7-Dec-10 11:07am

Thanks, it does rely on finding an open source implementation of the DCT algorithm that will compute the Fast Fourier Transform in feasible time, however this does of course depend on the size of both samples.

Similarly the comparison could potentially be very costly, as for each interval you would have to place your smaller sample as a template to find a match for that pattern, however I'm sure there are more efficient ways of doing that.

Viktor Signaievskyi · Answer 3 · 2011-12-19T09:52:00

Hello!

1. You should take the samples you suppose "to see" inside the sound file.
2. Compare this samples to the first block of sound data (get Convolution coefficient or to get an Euclidean distance).
3. Slide "comparative samples" through the "target samples" (where you would like to find the comparatives) and perform the same (as in item 2) operation.

In the result you will have a set of coefficients.

For the case of Euclidean distance the minimum value will show you the place "comparative samples" are located. To have an satisfactory results you should play with threshold value.

For the convolution the max value will tell you the location of the sound you are looking for.

Good luck!

Viktor Signaievskyi