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System and method for detecting keyboard tapping content by utilizing sound signals

A technology of sound signal and audio signal, applied in the field of using sound signal to detect keyboard tapping content, can solve the problems of high calculation cost, high condition requirements, and high number of detection devices, and achieves good recognition stability, improved accuracy, and accurate recognition. Effect

Active Publication Date: 2017-12-08
SHENZHEN UNIV
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Problems solved by technology

[0004] The above methods either need to use special signal acquisition technology and have relatively high requirements on environmental conditions, or require a relatively large number of detection equipment and high calculation costs, which are not universal

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  • System and method for detecting keyboard tapping content by utilizing sound signals
  • System and method for detecting keyboard tapping content by utilizing sound signals
  • System and method for detecting keyboard tapping content by utilizing sound signals

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Embodiment Construction

[0037] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0038] A method for detecting keyboard strokes based on sound signals, the steps comprising:

[0039] S1. The sound collection device collects the sound signal generated by tapping the keyboard, and preprocesses the sound signal;

[0040] S2. Using the energy detection algorithm to extract the signal segment of the keystroke peak of each tapping action;

[0041] S3. Calculate the short-term energy normalized value of each tap action and classify it with the time difference as a feature

[0042] S4. Feedback the response information for the recognition result, adjust the parameters of the classification algorithm, and further improve the accuracy.

[0043] Specifically, in step S1, the sound collection device can be an existing smart phone, a microphone installed on a raspberry pie, etc...

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Abstract

The invention relates to information processing technology, and discloses a method and a system for recognizing keyboard tapping content based on sound signals. According to the method, sound signals generated by clicking keys are collected through a sound signal collecting device, and the sound signals are preprocessed, so that the purpose of recognizing single keys and combination keys is achieved. The method mainly comprises the following steps: collecting sound signals generated by tapping the keyboard on a table top with specific layout by adopting a sound colleting device, and carrying out denoising on the received sound signals by adopting the methods including butterworth; calculating the short-time energy value generated by clicking the key each time, and performing normalization processing, wherein the numerical value is used as a feature; calculating the time difference generated by adopting two microphones, wherein the time difference is adopted as another feature, and carrying out fusing with the previous feature; and classifying the features by adopting a classification algorithm, so that single-key knocking or combination key knocking can be recognized.

Description

technical field [0001] The invention relates to the field of recognition based on sound signals, in particular to a method and system for detecting keyboard stroke content by using sound signals. Background technique [0002] Today, with the development of various signal detection systems, keyboard keystroke recognition is becoming more and more important. With different signal detections, we were able to reproduce the keystrokes. With the development of information security technology and people's higher and higher requirements for information confidentiality, being able to detect signals and do a good job of anti-detection is exactly what needs to be considered at the moment. While doing a good job of detecting keystrokes, design better ways to protect people's privacy. In the existing indoor environment, the sound generated by keystrokes, the influence of gestures on indoor WiFi signals, and the research on keystroke power can all be used as eavesdropping technology, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/51G10L25/27
CPCG01S5/18G06F3/043G10L25/48G10L25/51G10L25/27
Inventor 伍楷舜王璐王建
Owner SHENZHEN UNIV
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