[] [] Open Source DSTAR Voice -- Codec2: from KE7HQY on June 6, 2010 The DSTAR protocol is open and freely available, developed by the Japanese Amateur Radio League (JARL). However, the AMBE voice encoding scheme currently used by the DSTAR protocol is not open, rather it is patented by DVSI, Inc. Development on an open source, freely available alternative to AMBE has been spearheaded by Australian amateur David Rowe, VK5DGR. This open voice codec is called Codec2, and is in a highly experimental stage at this current point. It's advocates include Bruce Perens, K6BP, () who is well known in open source software circles, and is a huge Free Software advocate. What's the issue with AMBE? Codec2 developer David Rowe, VK5DGR talks about this on his blog: ---- 'Due to patents and the amount of confidential information surrounding these codecs (AMBE) I don’t think it is possible to make an open codec compatible with these closed codecs.

It is however possible to develop a open source, free-as-in-speech codec with similar performance at similar bit rates. [.] A free codec helps a large amount of people and promotes development and innovation' ---------- David Rowe's development site is: He is currently looking for assistance, either financially or with coding.

Because of financial obligations, he's currently on hiatus from development to pay bills with other work. Development milestones and source code are available through his website. Yeh Tera Ghar Yeh Mera Ghar Movie Download Mp4. David can be contacted at his email: David (at) rowetel.com A DSTAR protocol implementing Codec2 Digital Voice would significantly drop the entrance level and appeal to a much wider audience. Once Codec2 is stable and competitive, it would offer a real, developed-by-a-ham alternative to the patented AMBE voice encoder. If you are able to help with development please contact David Rowe! This article has expired. No more comments may be added.

Open Source DSTAR Voice -- Codec2: by on June 7, 2010 >AMBE voice encoding scheme currently used by the DSTAR protocol is not open, rather it is patented by DVSI, Inc. Hence the reason D-STAR is a loooooooser and will never be successful. I bet you $20 that Icom will never support this more open codec. RE: Open Source DSTAR Voice -- Codec2: by on June 9, 2010 Agreed. Simply compare the number of Echolink nodes to the number of DSTAR nodes at any given time. Echolink offers the VoIP functions of DLINK, essentially for free to the end user amateur on any equipment. DSTAR is nice in that it is a packaged solution, digital to the end node.

Too bad ICOM didn't use technology that could be put in the public domain. That was the strategic marketing mistake. DSTAR is five years old, ancient in general technology time. Marketing people look at 'rate of adoption' to determine the health of a given product.

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ICOM can't be happy with the results for DSTAR. If I were ICOM (and were still interested in amateur radio as a marketplace) I'd be formulating an 'EchoStar' or 'DLink' protocol to combine DSTAR/Echolink/IRLP with a gateway strategy, using modifications to existing radios that use an add-on device for DSTAR. This would enable them to quietly close the book on DSTAR and save face by offering a substitute product offering. Sql Effects Clarity Ce Edition Definition there.

Just my opinion. Mickey N4MB RE: Open Source DSTAR Voice -- Codec2: by on June 9, 2010 The RETAIL price of one AMBE codec chip is about $25, quantity one, bought from a ham in the Netherlands! It is NOT the huge unreasonable cost that people claim.

Compare it to the cost of any comparable codec in small quantities (including the support chips) and you'll see what I mean. The cost of actually developing a radio product which is only sold in a relatively small market is very real and contributes heavily to the overall cost, unless you're either a hobbyist or a company in business to lose money. Someone, starting with Mr Perens, needs a lesson on engineering economics and a little less time listening to himself talk. 73, john W3JKS/AAT3BF/AAM3EDE/AAA9SL RE: Open Source DSTAR Voice -- Codec2: by on June 10, 2010 Sorry you feel that way, John.