Dailydave mailing list archives
Re: Vista speach recognition
From: Michal Zalewski <lcamtuf () dione ids pl>
Date: Thu, 1 Feb 2007 19:43:04 +0100 (CET)
On Thu, 1 Feb 2007, Juha-Matti Laurio wrote:
http://blogs.technet.com/msrc/archive/2007/01/31/issue-regarding-windows-vista-speech-recognition.aspx
I find this kind of bogus. Voice recognition systems don't compare raw waveforms. Most of the information is discarded: they usually isolate a fraction of the signal, normalize it, chop it into discrete bits that best reflect changes in voice modulation or whatnot, then feed it to HMM analyzer or some other ANN. This is heavily optimized based on various assumptions on how human speech sounds, and how ambient noises might look like. What this means is that it is in all likelihood possible to produce a waveform that will be impossible to interpret for a human (either because it is masked by a superimposed signal, or because it does not resemble speech in the first place), but will be "heard" as meaningful words by Vista. So, you get an eerie industrial background music and noises on a website, instead of a dude reading out loud "my documents, delete, yes". Heck, this happens spontaneously: speech recognition systems sometimes pick up random burps and crashes from the environment and map them to dictionary words. And wasn't there an early demo for Vista speech recognition that wasn't trained for that particular salesdude, and kept hearing "dear aunt double the killer" instead of what he was saying? Oh yeah: http://video.google.com/videoplay?docid=-1123221217782777472 Now, I bet that MSRC dudes are well aware of this possibility, but chose not to mention it. Eh. /mz _______________________________________________ Dailydave mailing list Dailydave () lists immunitysec com http://lists.immunitysec.com/mailman/listinfo/dailydave
Current thread:
- Re: Vista speach recognition, (continued)
- Re: Vista speach recognition George Ou (Jan 31)
- Re: Vista speach recognition dan (Jan 30)
- Re: Vista speach recognition Halvar Flake (Jan 31)
- Re: Vista speach recognition christian void (Jan 30)
- Re: Vista speach recognition George Ou (Jan 30)
- Re: Vista speach recognition George Ou (Jan 30)
- Re: Vista speach recognition Ross Brown (Jan 31)
- Re: Vista speach recognition Sebastian Krahmer (Jan 31)
- Re: Vista speach recognition George Ou (Jan 31)
- Re: Vista speach recognition Sebastian Krahmer (Jan 31)
- Re: Vista speach recognition Juha-Matti Laurio (Feb 01)
- Re: Vista speach recognition Michal Zalewski (Feb 01)
- Re: Vista speach recognition Ken Buchanan (Feb 01)