Re: Analog Bridge
Aaron,toggle quoted messageShow quoted text
Both YSF and DMR are AMBE. The only difference is the wrapper. Let me try to explain it this way.
You write a letter and put it in a envelope addressed to me. You mail it off trough the post office. When the post office receives it, they take you letter out of the envelope. They put your letter, unaltered, into a a new envelop and deliver it to me. The only thing taht changed it the envelop. The letter is unchanged.
MB receives the YSF. It extracts the raw AMBE. It builds a new DMR transmission containing the raw AMBE wrapped in such a way that a DRM radio can understand it.
DMR, YSF (narrow) and NXDN are all AMBE.
P25 and YSF (wide) are IMBE
D-Star is AMBE (more or less) at a different rate.
A transcoder is 2 vocoders back to back (AB <-> AB)
AMBE to AMBE does not need a transcoder (Analog_Bridge)
AMBE to IMBE needs a transcoder.
AMBE to D-Star needs a transcoder.
IMBE to D-Star needs a transcoder.
Anything to analog needs a vocoder. (Digital <-> Analog) Analog_Bridge
Hope this helps, Steve N4IRS
On 11/23/20 7:42 PM, Aaron Groover wrote: