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  1. #1
    Registered User
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    Mar 2003
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    Luttenberg (Netherlands)
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    Recognize DTMF tones in downlink

    Hi,

    would it be possible to recognize DTMF tones in the downlink using APS? How to (start) develop such a component?

    To be clear: I do not want to send DTMF tones. I want to receive and recognize them!

    BR,

    Rene
    Rene Heuven
    Inmote - Creative Smartphone Solutions
    Web: www.inmote.com
    E-mail: rene@inmote.com

  2. #2
    Nokia Developer Moderator
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    Lempäälä/Finland
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  3. #3
    Registered User
    Join Date
    Mar 2003
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    11

    Re: Recognize DTMF tones in downlink

    Applied Goertzel algorithms are suitable for that job and are widely used in various points e.g. in telecom networks and functions. The topic has been widely covered in numerous DSP textbooks and a lot info can be found from the internet and Usenet groups.

    Have a look in here, includes a demonstrative C source:

    http://en.wikipedia.org/wiki/Goertzel_algorithm

    BR,

    -Ari
    Last edited by arijr; 2009-04-02 at 08:36.

  4. #4
    Nokia Developer Expert
    Join Date
    Jun 2008
    Posts
    333

    Re: Recognize DTMF tones in downlink

    I think that there is no public api to detect DTMF tones
    probably you need to implement your own component to detect DTMF by using Goertzel Algorithm

  5. #5
    Registered User
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    Mar 2003
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    Luttenberg (Netherlands)
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    Re: Recognize DTMF tones in downlink

    Hi,

    thanks! That answer sounds very reasonable and helpful. Will have a look.

    BR,

    Rene
    Rene Heuven
    Inmote - Creative Smartphone Solutions
    Web: www.inmote.com
    E-mail: rene@inmote.com

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