I’m always a little put off by profanity filters. They are increasingly built into video games and seem to find their ways into all sorts of other applications. What I didn’t expect was a filter on a cell phone, and then Google did it.

Yes, the Nexus One has a profanity filter as a part of its speech-to-text engine. At first I was pretty surprised. It seems mighty presbyterian of Google to pull something like that without talking about it. The real reason, though, makes a lot of sense.

We filter potentially offensive or inappropriate results because we want to avoid situations whereby we might misrecognize a spoken query and return profanity when, in fact, the user said something completely innocent.

So instead of something nasty when your four-year-old says ‘duck,’ all he’ll see is ‘####.’ Unfortunately, there isn’t a way to disable the feature, so you’ll have to write out that drunken text instead of just yelling it into your phone.