In Progress

DTMF tone detection in live audio stream (for vedenev)

Implement C++ classes and test application to detect DTMF tones in a continuous live audio stream using Goertzel algorithm.

The audio stream will be received in a Directshow graph and extracted using the Sample Grabber filter, we can provide all the code to build the graph and receive the audio samples if required.

Need to detect DTMF tones in the audio at various sample rates (8, [url removed, login to view], 12, 16, [url removed, login to view], 24, 32, 44.1 and 48kHz) in mono or stereo (either left/right or both).

The following features should also be implemented:

1. Detect silence between tones (so we know if a tone has been pressed twice)

2. Check for harmonics so that music can be rejected as not a DTMF tone

3. Check that the magnitude of the row and column frequency are similar

4. Check for column frequencies first then stop precessing if they aren't found (reduces CPU load)

5. 40mS tones may not be aligned with 40mS sample buffers (might be 10mS of tone in previous and 30mS of tone in next buffer), need to allow for that.

6. Must work with above sample rates (most algorithms only work at 8kHz, we need all 9 sample rates)


[url removed, login to view]

[url removed, login to view]

[url removed, login to view]

[url removed, login to view]

I've attached some sample wav files and Directshow code to open a wav file, for testing it might be easier just to read the wav files directly as a binary file.

## Deliverables

Windows OS

Visual Studio 2008, 2010 or 2012


Can use ATL, not MFC or other large libraries.

Skills: Embedded Software, Software Architecture, VoIP, Windows Desktop

See more: www work from home com au, work in au, testing algorithms, test algorithms, samples of algorithms, mathworks, in a graph, https www sites google com, https sites google site, https sites google com site, html 5 application examples, help with algorithms, hackaday, graph in algorithm, graph algorithms in c, graph algorithms c, graph algorithm in c, first graph, examples of algorithms, examples for algorithms, examples algorithms, binary t, binary frequency, binary code test, binary code sample

About the Employer:
( 44 reviews ) Altona, Australia

Project ID: #2783228

Awarded to:


See private message.

$416.5 USD in 21 days
(23 Reviews)