A friend of mine, Cameron, was having dreadful trouble with Dragon's recognition accuracy. Unfortunately, Cameron lives in Bangkok, a night's flight from Sydney, so I couldn't just go and see what the problem was. Sometimes Dragon's recognition worked well for Cameron, sometimes it didn't. He was frustrated because he had been hoping to use Dragon in a presentation to impress his audience.
We'd been through the usual checklist:
- Make sure the headset microphone is positioned at the corner of your mouth, about a thumb's width from your face. This will reduce the breathiness of your audio and make Dragon's task easier.
- Check that you get a good score in the Dragon Audio Setup. I like to have a score over 20. Cameron usually got a good score and we'd tried different headsets so we knew that there wasn't a problem with the microphone itself.
- Do at least the short enrollment when you set up your voice profile. This is where Dragon trains itself to your voice by having you read to it. Dragon allows you to skip the training session and go straight to dictation once you've done a basic configuration. However, Cameron's English is unusually accented and I recommended that he did the basic training plus some additional training that's available in Dragon's Accuracy Centre.
- When Dragon makes a mistake, correct the error so that the software can learn how you speak.
All of this was to no avail. Dragon's performance was unpredictable and seemed to be under the influence of forces beyond mortal control. We got working on conspiracy theories: The laptop is bad. The audio chip has an intermittent fault. It's the operating system. Dragon doesn't like me!
The answer turned out to be simple. I'd forgotten one item on the standard check list.
I asked my colleague Bob to see if he had any ideas and he had the problem quickly resolved by asking one question: Is the white dot pointing at your mouth?
Noise-canceling microphones have at least two microphones in them. One faces your mouth. The other picks up sound from the opposite direction, the noise. The noise is subtracted from the signal coming from your mouth and your considerably clearer voices goes down the wire and is processed by Dragon. Most headsets have a white dot on the boom mike to indicate the side that should face. I'd forgotten to tell Cameron that and, as a result, the microphone ended up pointing at a random location.
Cameron made sure he had the microphone was pointing the right way and recognition of his speech was consistently after that. Cameron wowed his audience at his presentation.
So, when you're using Dragon, make sure you are talking to the dot! (And, yes, names have been changed to protect the innocent!)
Posted
03-11-2009 3:39 AM
by
Derek Austin
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