This could allay some doubts as to whether Amazon has the stomach to keep competing in the tablet wars vs Apple’s iPad and a growing fleet of products powered by Google’s Android operating system. The e-retailer says today that it bought IVONA Software, the Poland-based firm that powers the “Text-to-Speech,” “Voice Guide” and “Explore by Touch” features on Amazon’s Kindle Fire tablets as well as other companies’ products and services. IVONA’s voice and language portfolios include 44 voices in 17 languages. “The IVONA team shares our passion for innovation and customer obsession, and we look forward to building great products to deliver world-class voice solutions to customers around the world.” Amazon Kindle VP Dave Limp says. The companies didn’t disclose financial terms. Amazon shares are up about 2.5% in early trading.