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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NXOEENF4LN6UP6UAQZETXJO2DMYIO45K/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "NXOEENF4LN6UP6UAQZETXJO2DMYIO45K",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V7RGAVHNQMCS6MZXXX5MTMGU7DOGNQAE/",
    "sender": {
        "address": "kf6kyi (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Mark Vandewettering",
    "subject": "[amsat-bb] Re: D-STAR experiment on Cubesat",
    "date": "2008-06-09T05:59:03Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5E3IOSWWGB2DKCD3FYRM426HUDMBUS4Z/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/36WCCNIDZXUOQINP3CJ5KGANHX7D33BG/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nOn Jun 8, 2008, at 9:18 PM, David Donaldson wrote:\n\n> Do we think that anyone other then Icom will ever support the mode?   \n> I'd\n> love to experiment with it on the birds but until there is  \n> competition to\n> drive the price down will that be possible.\n>\n> Maybe a GNU project?\n>\n> Dave\n> WB7DRU\n> Minnesota\n\nSadly, it's basically impossible to make a software version which  \ninteracts with D-Star because of the fact that the vocoder they chose  \nto use is encumbered by patents.   This is one of the principle  \nreasons that I can't generate any enthusiasm for D-Star, despite  \nhaving a number of interesting capabilities that would be useful for  \namateur radio.\n\nThe Wikipedia page sums it up pretty well:\n\nD-STAR has been criticized for its use of a patented, closed-source  \nproprietary voice codec (AMBE). [4] Hams do not have access to the  \ndetailed specification of this codec or the rights to implement it on  \ntheir own without buying a licensed product. Hams have a long  \ntradition of building, improving upon and experimenting with their own  \nradio designs. The modern digital age equivalent of this would be  \ndesigning and/or implementing codecs in software. Critics say the  \nproprietary nature of AMBE and its availability only in hardware form  \n(as ICs) discourages innovation. Even critics praise the openness of  \nthe rest of the D-STAR standard which can be implemented freely. An  \nopen-source replacement for the AMBE codec would resolve this issue.\n\nThe problem as I see it is that there really aren't a lot of choices  \nfor low bitrate audio coders.  LPC is of course a possibility, and is  \nfree from intellectual property encumberments, but it makes everyone  \nsound like a speak n' spell.  The speex codec is open, but doesn't  \nreally work down into the 2400bps that we'd like to have.   There  \naren't a lot of other choices that I'm aware of.  It sure would be  \nnice to find one though: with all the experimentation with SDR,  \ndigital voice could be a no-cost addition to radios, and a rich  \nenvironment for experimentation.\n\n\tMark\n\n",
    "attachments": []
}