Audio Note VINDICATOR User Manual Page 6

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Vocoder
IMBE™ by DVSI is the P25 Vocoder
Model-based like virtually all vocoders
Optimized for Low Bit Rate Apps (< 4.8 kbps)
Breakdown
20 ms frame (50 frames per second)
88 vocoder bits
56 error control bits (unequal protection)
48 signaling bits
192 bits x 50 frames/s = 9600 bps
BER Estimator Used for Frame-by-Frame Decisions
Smoothed estimator weighs past, present, future frames
Has implications for performance metrics
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