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Thread: amr encoder

  1. #1
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    Mar 2003
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    amr encoder

    Hi all, I'm working on making an AMR encoder. It is based on the source code of AMR speech codec (3GPP TS 26.073). The source wave data is encoded by this codec and then is packed into AMR storage format (draft-ietf-avt-rtp-amr-13.txt section 5). Unfortunately, the generated amr file is only the noise when playing in 7650. Can anyone give me some advice? Thanks for your attention.

  2. #2
    Nokia Developer Expert
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    RE: amr encoder

    Hello!

    AMR files coded with Ericsson tool works fine with 7650, can you compare your AMR files to ones that has been created with Ericsson?

    Teemu / Forum Nokia

  3. #3
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    RE: amr encoder

    There are several differences between the 3GPP and the Series 60 AMR files, most significantly that they store the frame bits in opposite order within each byte, and that the packed bits are skewed by one nibble. I have written a Python program to convert between these two formats, please see: http://www.connact.com/~eaw/amrwork for details.

  4. #4
    Nokia Developer Expert
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    RE: amr encoder

    Hello!

    We are also coming out with new conversion tool shortly.

    Teemu / Forum Nokia

  5. #5
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    Any idea idea when?

    ..when that tool will be available? It´s been more that one moth and a half...

    Cheers

  6. #6
    Regular Contributor
    Join Date
    Mar 2003
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    202

    Multimedia Converter 2.0 Beta Now Available

    The beta of the Nokia Multimedia Converter 2.0 is now available here: http://www.forum.nokia.com/main/1,35...ml&fileID=2906

    Use this tool for AMR-NB and h.263 3GPP video conversion.

    - Matt
    Toolkit Team

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