Correct.
The Intellivision, when combined with its Intellivoice adaptor, could produce
barely recognizable speech. Only three games were released that made use of Intellivoice, Space Spartans, Bomb Squad, and B-17 Bomber, before the whole endeavor was declared a flop. Turns out the memory the voice files had to be stored on were too darn expensive. By the time the NES rolled out, memory had gotten good enough that they no longer had to mangle words to the edge of incomprehensibility just to get them to fit, and we end up with
much cleaner results.