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Which was the first Software Defined Radio that included a programmable voice coder?

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Which was the first Software Defined Radio that included a programmable voice coder?

(a) SPEAKeasy – 1

(b) SPEAKeasy – 2

(c) ICNIA

(d) Cluster HMS

This question was addressed to me by my college professor while I was bunking the class.

I'd like to ask this question from Architecture Evolution topic in chapter Architecture Evolution of Cognitive Radio

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Correct option is (b) SPEAKeasy – 2

The explanation is: SPEAKeasy – 2 was an appropriately sized radio with features such as programmable voice coder, DSP resources to support different waveforms.

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