[App_rpt-users] AMBE question

Thu Oct 29 13:38:03 UTC 2015

When we did the DMR to AllStar testing, we used the NW Digital Radio 
DV3000. It was mounted on a RPi2 running asterisk.
The DV3000 uses AMBE-3000 vocoder chip from DVSI. We tested with 
Mototrbo and D-Star. Did not have a Fusion or P25 radios.

73, Steve N4IRS

On 10/29/2015 8:03 AM, David McGough wrote:
> 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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