[App_rpt-users] AMBE question (was: DIAL Question)

[David McGough]

Guys,

I haven't looked carefully as to which variants of AMBE are in use by 
D-STAR, Fusion, etc...Doesn't the original AMBE patent expire fairly soon?

The reason I'm asking is that I know there are some fledgling open-source 
AMBE implementations out there.  A couple years ago I hacked CODEC2 into 
Asterisk for experimentation, thinking about directly linking to HF via 
the FreeDV project--and, not wanting to transcode from one low-bandwidth 
CODEC to another, making truly awful audio!

After playing with it a few weeks, I didn't do much more...(I've still 
got that code and it still works, if anyone wants to play with it?)

...Just wondering.

73, David KB4FXC


On Thu, 29 Oct 2015, Matthew Pitts wrote:

> Mike,
> 
> You are correct in the statement that the DV4mini needs additional 
hardware to handle the transcoding from a digital radio. Once I get my 
nodes back up on my Raspberry Pi, I will work on an updated version of 
the D-STAR channel driver that supports DMR and Fusion AMBE encoding and 
decoding as well as radio control functionality for the DV4mini.
> 
> Matthew Pitts
> N8OHU 
> 
> On October 28, 2015 6:18:34 PM EDT, Mike Zingman <mike.zingman at gmail.com> wrote:
> >Actually the DV4Mini alone does not help tie Allstar into Wires-X.  In
> >order to do that one must:
> >
> >1) Have an interface to the YSF network protocol
> >2) Decode and extract the AMBE frames from the streamed protocol
> >3) Transcode the frames to PCM at the proper sample rate using the DVSI
> >AMBE3000 chipset
> >4) Send those frames to something like the already created USRP channel
> >driver
> >
> >In reverse, 4, 3, 2, 1 to send data back to the YSF network.  In
> >addition
> >to the simple outline above, you would want to
> >a) Add audio filtering/shaping to make the AMBE audio more acceptable
> >to
> >what we are used to on Allstar (one of the single greatest aspects of
> >Allstar is the audio quality)
> >b) Transfer of as much metadata between the networks as possible
> >
> >The DV4Mini is a radio module + digital modulator (DStar/DMR/YSF).  It
> >has
> >no AMBE encode/decode hardware so there is no way to transcode the
> >audio
> >content.  For that a "ThumbDV" or a DV3000 would be the hardware of
> >choice.  The DV4Mini could be used as a user radio on an existing RF
> >network, but one would still need the AMBE3K to do the transcode.
> >
> >Mike
> >
> >
> >On Wed, Oct 28, 2015 at 5:48 PM, Neil k8it <k8it at cac.net> wrote:
> >
> >> I have been waiting a bit before I start playing with DIAL on a RPI2.
> >> I still have two questions
> >> 1. Does the RPI2 DIAL  version solve the tx echo buffer issue that
> >the
> >> current version of Asterisk RPI2 code has. The fix to this issue
> >seems to
> >> be taking a long time.
> >> 2. Some users have reorted that a lot of modules have been disabled,
> >such
> >> as the Echolink channel driver and others.
> >> 3. With the new Mini-DV4  dongle $125  and the amount of capability,
> >has
> >> anybody wrote a channel driver to tie the Yaesu Fusion Wires-X
> >network into
> >> DIAL. It appears that most of the documentation is out there, we just
> >need
> >> someone to write the channel driver
> >>
> >>
> >> Thanks
> >> 73 Neil Sablatzky  K8IT
> >> Allstar Node 41838 KITLINK
> >> Allstar Node 42087 KITLINK HUB
> >> IRLP Node exp0068
> >> Echolink K8IT-L
> >> WIRES-X K8IT 11479 Room 21479
> >>
> >> *From:* Steve N4IRS <szingman at msgstor.com>
> >> *Sent:* Tuesday, October 27, 2015 10:35 AM
> >> *To:* N7MTC . <n7mtc at outlook.com> ; app_rpt-users at ohnosec.org
> >> *Subject:* Re: [App_rpt-users] Procedure for loading DIAL on a R-Pi2
> >or a
> >> PC
> >>
> >> Mac,
> >> The RPi2 install is pretty much download the image, burn it to SD
> >card,.
> >> Once the Pi boots, you can login on the HDMI / USB console, or SSH
> >into
> >> the board on port 222.
> >> The board is setup for DHCP so check your DHCP (router) server for
> >address.
> >> If you want, you can login via the built in serial port at 115,200
> >> System will walk you through setup.
> >>
> >> FAQ for DIAL is at:
> >> <http://docs.allstarlink.org/drupal/node/170>
> >> <http://docs.allstarlink.org/drupal/node/170%3E>
> >>
> >> 73, Steve N4IRS
> >>
> >>
> >> On 10/27/2015 10:20 AM, N7MTC . wrote:
> >>
> >> Is there a procedure for loading the "new" DIAL version of asterisk
> >for
> >> Raspberry pi2?
> >>
> >>
> >>
> >> I am looking to connect either a Pi2 or an intel NUC to a Yaesu Dr-1x
> >> using the Arcom RC-210 and  the Arcom ADR.  I noticed DIAL has
> >replaced
> >> ACID as the latest flavor of asterisk for both PC and PI2.  I have
> >not
> >> found any install write-ups or YouTubes showing a DIAL install.
> >>
> >>
> >>
> >> Regardless of which platform I will need to use an USB to Serial
> >adapter
> >> to connect the ALLSTAR node to the repeater controller.  It will be
> >of
> >> the FTDI chipset either a trendnet Tu-s9 or a GearMo USB RS-232.
> >>
> >>
> >>
> >>
> >>
> >> /73
> >>
> >> Mac, N7MTC
> >>
> >>
> >>
> >>
> >>
> >> Benjamin Franklin - "Those who surrender freedom for security will
> >not
> >> have, nor do they deserve, either one."
> >>
> >>
> >>
> >> _______________________________________________
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