Advanced Multiband Excitation vocoder based on the DVSI AMBE-2020 vocoder is
being designed for low-bit rate voice communication. The alpha
prototype is shown with the AMBE-2020 device at the top center. An
Analog device ADSP-2185 digital signal processing microcomputer, at the top
right, is configured as an orthogonal frequency division multiplexing (OFDM)
modem. The host microprocessor is a Ubicom SX28A.
The latest configuration is the AMBE vocoder core but with a USB 2.0 interface to a PC, a Windows XP/Vista control program and a Xilinx Spartan-3A FPGA replacing the ADSP-2185 and the Ubicom SX28A.