Are the authors available on this list -- I read the paper and if some
trial is available would like to play with this on our setup (similar to
SM1000 but with a different RF front end). A training set for each user can
be incorporated when they first state and made available to all...
thanks,
On 22 April 2018 at 01:32, David Rowe <da...@rowetel.com> wrote:
> Some amazing work with Codec 2 and WavNet ... using a Codec 2 encoder and
> WaveNet decoder they have speech quality as good as AMB wideband at just
> 2400 bit/s
>
> http://www.rowetel.com/?p=5966
>
> - David
>
> On 20/04/18 11:41, David Rowe wrote:
>
>> Hi Bruce,
>>
>> I'll be presenting at our WIA national conference on the same dates ..
>> will send you the slides. Aiming to release on FreeDV GUI by then.
>>
>> - David
>>
>> On 20/04/18 11:35, Bruce Perens wrote:
>>
>>> Woo hoo! Please tell me about anything you'd like me to present at
>>> Hamvention. This will definitely be in there.
>>>
>>> On Thu, Apr 19, 2018 at 6:51 PM, David Rowe <da...@rowetel.com <mailto:
>>> da...@rowetel.com>> wrote:
>>>
>>> Hello,
>>>
>>> I've been working steadily on FreeDV 700D, porting from Octave to C,
>>> and working through some tricky sync problems. I can now simulate
>>> the end-end system on the command line, and listen to the results.
>>> It's outperforming FreeDV 1600 by about 10dB on fast fading
>>> channels, and is error free at -2dB SNR on AWGN channels.
>>>
>>> The main differences from FreeDV 700C are a new OFDM modem with rate
>>> 1/2 LDPC code and the option of a long interleaver (seconds of
>>> latency). It uses the the 700 bit/s codec, although with a few
>>> tweaks we could run other codecs and LDPC codes using a few dB more
>>> SNR. More inf on the FreeDV 700D mode here:
>>>
>>> https://www.rowetel.com/?p=5573 <https://www.rowetel.com/?p=5573>
>>>
>>> For anyone who would like to play along, here's README_ofdm.txt for
>>> the mode:
>>>
>>> https://svn.code.sf.net/p/freetel/code/codec2-dev/README_ofdm.txt
>>> <https://svn.code.sf.net/p/freetel/code/codec2-dev/README_ofdm.txt>
>>>
>>> This includes references to blog posts, lots of command line
>>> examples, and specification at the end. There's enough information
>>> for the super keen to run it over the air using the cmd line tools,
>>> which I haven't done yet.
>>>
>>> Next steps are some over the air tests, write a freedv_api.c "mode"
>>> for it, integration into the FreeDV GUI program, and lots of
>>> tweaking.
>>>
>>> - David
>>>
>>> On 16/04/18 08:52, Glen English wrote:
>>>
>>> I will write more abt this when I return, however a) the quality
>>> of the capacitor influences notch depth, b ) getting the area
>>> and proximity of the loop to the line matters. for a 6" filter,
>>> anything over 33db for 600k bp-reject is very good.
>>>
>>>
>>>
>>>
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>>>
>>>
>>> --
>>> Bruce Perens K6BP - Standards committee chair, license review committee
>>> member, Open Source Initiative
>>> President, Open Research Institute
>>>
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