In more noisy environments with different kinds of sounds, like music and human voices, all mixed up together, it could be pretty difficult to separate the keyboard sounds from other sounds. |
Using statistical learning theory, the computer can categorize the sounds of each key as it's struck and develop a good first guess with an accuracy of 60 percent for characters, and 20 percent for words. We then use spelling and grammar checks to refine the results, which increased the character accuracy to 70 percent and the word accuracy to 50 percent. The text is somewhat readable at this point. |
We only need to record the sound. We do not need your cooperation to attack you. We just put a small recording device near your keyboard. |