On 24 April 2018 at 00:00, Michael Wen <mike...@gmail.com
<mailto:mike...@gmail.com>> wrote:
My understanding the decoder does not require a lot of computing
power. Training the data is.
yes it looks like that.
Training the data can be achieved one-time using some kind of
smart-phone/ offline utility because this need not be real-time. we can
then feed this to our decoder. Does that work ?
On Mon, Apr 23, 2018 at 1:04 AM, David Rowe <da...@rowetel.com
<mailto:da...@rowetel.com>> wrote:
> I don't think they are on this list, but I have had a response
via email so
> free free to reach out to them.
>
> Their current algorithm needs a GPU to decode, so won't run on a
SM1000 (or
> even CPU) class machine. This sort of computational complexity
is common
> for new DSP algorithms. The tend to get more efficient over time.
>
> - David
>
> On 23/04/18 13:46, Akshay Mishra wrote:
>>
>> 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
<mailto:da...@rowetel.com>
>> <mailto:da...@rowetel.com <mailto: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>
<mailto:da...@rowetel.com <mailto:da...@rowetel.com>>
>> <mailto:da...@rowetel.com <mailto:da...@rowetel.com>
<mailto: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>
>> <https://www.rowetel.com/?p=5573
<https://www.rowetel.com/?p=5573>>
>> <https://www.rowetel.com/?p=5573
<https://www.rowetel.com/?p=5573>
>> <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>
>>
>>
<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>>
>>
>>
<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>
>>
>>
<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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