SoundHound AI (SOUN -1.11%) is a specialist in conversational artificial intelligence (AI) software, which understands voice prompts and responds in kind. Its customers include some of the world's biggest brands, and it even attracted an investment from Nvidia (NVDA 1.28%).Nvidia supplies the world's most powerful data center chips for AI development, and booming sales have driven its market capitalization from $360 billion to $3.83 trillion over the last two and a half years alone. Therefore, it's no surpr ...