Hello, One of the "problems" with DStar and some other digital voice systems is the Patent and other IP considerations. DStar uses the AMBE codec which is owned by DVSI. Icom uses a DVSI AMBE2020 chip in their DStar products. One possible solution is to buy hardware that puts the Patent and IP into a chip. This increases the cost of the hardware and you need to interface it to the PC.
Some chip makers do not make chip information available, but DVSI does. The USER Manual is very informative. http://www.dvsinc.com/products/a2000.htm A group was able to produce a USB Device that interfaces the AMBE2000 chip to the PC. The icing on the cake is it is an open source project. The API appears similar to the RF Space SDR products. http://www.moetronix.com/dvdongle/ The DV Dongle is now in production and even has a website, http://www.dvdongle.com/DV_Dongle/Home.html So I ordered one for $200 from HRO and hope to get it in a few days. It should be possible to add support for it in GNURadio. I am also thinking of writing a APCO P25 Voice to AMBE2000 frame converter and see if the device can decode P25 as well. This may be a general IMBE and AMBE codec. 73 Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
