Cast your mind back to a couple of years ago when Google first launched Voice Search. When they did, they wanted it to work perfectly. And it did; for the most part. Voice Search works pretty well because it was made with speech models that allow for a wide variety of inflections, without taking gender, age, or accent into consideration. But, as the guys at Google know, there is always room for improvement.
Google has made Google Voice even better by paying attention to people like you. What this means is that if you decide to use personalized recognition, Google Voice will begin to associate the recordings of the words you most frequently search for via your Google account. A unique speech model is then built just for you. This new speech model provides far greater accuracy.
So, if you have never used Voice Search before, now is the perfect time to start. During your initial use, you will be presented with the option to use personal recognition or not. Because Google takes your privacy seriously, you can opt in or out at any time. You can also disassociate your voice recordings from your Google Account.
Personalized recognition is only available in English for the U.S. at this time, though they have said that they plan to support other countries in the near future. If you want to use this new version of Voice Search, just make sure you have Android 2.2 or higher. You can download it from the Android Market.
Source – googlemobile.blogspot.com