FAA20 Vocoder Card:
The FAA20 Vocoder is a 4"x5" printed circuit card that performs
ATC-10B voice encoding/decoding operations on analog voice or PCM voice
streams.
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The ATC-10B algorithm is specified in DO-224B as the standard for the FAA’s Next Generation Communication (NEXCOM) system. It compresses 128 kbps PCM voice (16-bit voice samples at 8 ksps) into a 4800 bps stream. It is designed as an upgraded replacement for the DVSI VC-20 hardware module. Unlike the VC-20, the FAA20 uses the new fixed point implementation of the ATC-10B algorithm and supports truncated timing operation (i.e 4000 bps operation). It is fully compatible with systems designed to accept the original VC-20 module. |
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CIE Engineering, Inc. • 6001 Woodlake Lane • Alexandria, VA 22315 • Phone: (703) 922-7061