Subelement M: M – Communications Technology— Topic 83: Coding and Multiplexing
Question 3-83M5
Element 3 (GROL)What CODEC is used in Phase 2 P25 radios?
Explanation
Phase 2 P25 radios utilize the **AMBE+2™** (Advanced Multi-Band Excitation) voice CODEC. AMBE is a proprietary voice compression algorithm developed by Digital Voice Systems, Inc. (DVSI). Its purpose is to efficiently digitize and compress analog voice signals into a digital data stream, allowing for clear and bandwidth-efficient digital communication over radio channels.
While P25 Phase 1 uses IMBE (Improved Multi-Band Excitation), Phase 2 specifically employs the more advanced AMBE+2, which offers improved performance and robustness, especially when operating in the 2-slot TDMA (Time Division Multiple Access) scheme of Phase 2.
The other options are incorrect: IWCE is a trade show, IMBC is not a recognized P25 CODEC, and IMMM is not related to radio CODECs.
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