Might somebody have aspergers syndrome without unusual speech pattern in my voice?

Sure: Nobody knows what "asperger's" really is. The classic aspie talks fast & mechanically a lot of the time, but no two are the same. The real question isn't, "do I have thus-and-so?" but "how can i learn social skills that seem to come more naturally and more easily to others?" remember that asperger's offers tremendous pluses in your ability to focus on science, tech and so forth.