Hi Craig > This contrained the final (4800 bps/6.25 kHz) air interface to a 2400 bps > AMBE perceptual coder with 2/3 convolutional FEC. This left about ~1kilo bit > a second of data on the air interface for usage as data (as any user saw > fit!).
You're a little wrong here. D-Star uses the AMBE codec in block FEC mode. The FEC used is two blocks of Golay (24,12,8) with the remaining 24 bits unprotected. I presume this latter block is of less significant bits that can sustain corruption with relatively little impairment of the carried speech. Jonathan G4KLX
