CN103997381A - Examination room cheating signal intelligent identification and evidence collecting and restoring method - Google Patents
Examination room cheating signal intelligent identification and evidence collecting and restoring method Download PDFInfo
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- CN103997381A CN103997381A CN201410235894.2A CN201410235894A CN103997381A CN 103997381 A CN103997381 A CN 103997381A CN 201410235894 A CN201410235894 A CN 201410235894A CN 103997381 A CN103997381 A CN 103997381A
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Abstract
The invention discloses an examination room cheating signal intelligent identification and evidence collecting and restoring method. The method comprises the following steps of examination room signal obtaining, signal modulation and identification, signal demodulation and restoring, content identification and cheating signal feedback, wherein in the step of content identification, voice activity detection is carried out on signals processed through demodulation, then identification of key words related to cheating is carried out on the signals, the signals are added into a blacklist and fed back if cheating key words related to the cheating exist, if no cheating key words related to the cheating exists, whether cheating signals exist or not is judged manually, and the signals are added into a blacklist and fed back if it is judged manually that the cheating signals exist, and otherwise identification is ended. The process is repeated. According to the examination room cheating signal intelligent identification and evidence collecting and restoring method, various suspected cheating signals collected in the detection process can be identified and analyzed effectively and automatically, demodulation and restoring are carried out on common cheating signals, intelligent identification on the cheating content is completed, a user does not need to carry out manual monitoring and distinguishing on a great number of cheating audios and digital content one by one, working efficiency of blocking the cheating signals is improved greatly, identification results are fed back in real time, and cheating signal detection based on the content is achieved.
Description
Technical field
The present invention relates to a kind of examination hall cheating signal processing method, relate in particular to the identification of a kind of examination hall cheating signal intelligent and evidence obtaining method of reducing.
Background technology
High-tech cheating signal blocker system is current protection examination hall electromagnetic environment, the equipment that ensures the fair and just needs of examination.All kinds of blocking systems are except completing the blocking-up of the wireless cheating signal in examination hall, also need to carry out the evidence obtaining reduction of doubtful cheating signal, for the system operation assessment of usefulness and the investigation and analysis of cheating provide support.For this reason, need emphasis to solve following problem:
1, the Modulation Identification of doubtful cheating signal, type identification and cheating content Intelligent Recognition;
2, various types of voice signal reduces with the demodulation of the number number of delivering a letter.
Current, full frequency band cheating signal blocker equipment, owing to lacking signal detection link, cannot be realized evidence obtaining and the reduction of cheating content to the wireless cheating signal in examination hall.Detecting guiding blocking-up system is the developing direction of cheating prevention and control system, and existing system is due to disposal ability and intelligent degree deficiency, can't meet well the needs of cheating signal evidence obtaining reduction.
At present, the method that this field adopts is substantially as follows:
1, demodulation reduction: the doubtful cheating signal gathering is carried out to demodulation reduction, generally demodulation FM modulating voice signal and the part data-transmission type signal of practising fraud automatically;
2, artificial monitoring distinguished: after every examination, a large amount of cheating voice and the digital content of reduction are manually monitored, as confirmed as cheating content, become the foundation of evidence obtaining.
In examination, detecting process separates with evidence obtaining reduction process, the information that can not utilize evidence obtaining reduction to obtain in detecting process, can not realize content-based detecting, intelligent degree is inadequate, need a large amount of artificial monitorings to distinguish work, cause inefficiency, specific aim and the accuracy of detecting have much room for improvement.
Summary of the invention
Object of the present invention is just to provide in order to address the above problem the identification of a kind of examination hall cheating signal intelligent and evidence obtaining method of reducing.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The identification of a kind of examination hall cheating signal intelligent and evidence obtaining method of reducing, comprise the following steps:
(1) examination hall signal acquisition: obtain examination hall signal by detecting or acquisition mode;
(2) signal Modulation Identification: first identify whether FSK modulates, if not, identification is AM modulation or FM modulation;
(3) signal demodulation reduction: if FSK modulation judges whether known type, if so, carry out forwarding step (5) to after FSK demodulation, if not, directly forward step (5) to; If AM modulation is carried out forwarding step (4) to after AM demodulation, if modulating, FM carries out forwarding step (4) to after FM demodulation;
(4) content recognition: the signal after AM demodulation or FM demodulation process is carried out to voice activation detection, then carry out the keyword identification relevant to cheating, if there be the cheating keyword relevant to cheating, forward step (5) to, if do not had, the artificial judgment signal of whether practising fraud, if it is forwards step (5) to, otherwise finishes identification;
(5) cheating signal feedback: the cheating signal identifying is added after feeding back to examination hall signal acquisition equipment after blacklist and returns to step (1).
1, cheating signal intelligent in examination hall according to claim 1 identification and evidence obtaining method of reducing, is characterized in that: in described step (4), content aware step is:
1. preliminary treatment: first carry out FIR bandpass filtering, then divide frame, windowing process;
2. voice are differentiated: adopt the mode of short-time energy and short-time zero-crossing rate to judge to the signal after a point frame, windowing process, determine it is non-speech audio or voice signal;
3. if voice signal, carry out end-point detection, then carry out the feature extraction based on linear prediction cepstrum coefficient coefficient and Mel frequency cepstrum coefficient, identify according to HMM the row mode coupling of going forward side by side again and be finally judged as cheating signal by default decision rule, or, be trained for reference model according to HMM;
2. 1. above-mentioned steps be the method that described voice activation detects with step, and 3. above-mentioned steps is that method for distinguishing known in described keyword.
Beneficial effect of the present invention is:
Cheating signal intelligent in examination hall of the present invention identification can be carried out automatic discriminance analysis to all kinds of doubtful cheating signal gathering in detecting process effectively with evidence obtaining method of reducing, common cheating signal is carried out to demodulation reduction, and complete cheating content Intelligent Recognition, user is without more a large amount of cheating voice and digital content being carried out manually monitoring and distinguishing one by one, greatly improve the operating efficiency of cheating signal blocker, and recognition result is carried out to Real-time Feedback, realize content-based cheating signal detection.
Brief description of the drawings
Fig. 1 is the flow chart of cheating signal intelligent identification in examination hall of the present invention and evidence obtaining method of reducing;
Fig. 2 is the flow chart of content identification method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, cheating signal intelligent in examination hall of the present invention identification and evidence obtaining method of reducing, comprise the following steps:
(1) examination hall signal acquisition: obtain examination hall signal by detecting or acquisition mode;
(2) signal Modulation Identification: first identify whether FSK modulates, if not, identification is AM modulation or FM modulation;
(3) signal demodulation reduction: if FSK modulation judges whether known type, if so, carry out forwarding step (5) to after FSK demodulation, if not, directly forward step (5) to; If AM modulation is carried out forwarding step (4) to after AM demodulation, if modulating, FM carries out forwarding step (4) to after FM demodulation;
(4) content recognition: the signal after AM demodulation or FM demodulation process is carried out to voice activation detection, then carry out the keyword identification relevant to cheating, if there be the cheating keyword relevant to cheating, forward step (5) to, if do not had, the artificial judgment signal of whether practising fraud, if it is forwards step (5) to, otherwise finishes identification; The concrete grammar that foregoing is identified the identification of included voice activation detection and keyword as shown in Figure 2, comprises the following steps:
1. preliminary treatment: first carry out FIR bandpass filtering, then divide frame, windowing process;
2. voice are differentiated: adopt the mode of short-time energy and short-time zero-crossing rate to judge to the signal after a point frame, windowing process, determine it is non-speech audio or voice signal;
3. if voice signal, carry out end-point detection, then carry out the feature extraction based on linear prediction cepstrum coefficient coefficient and Mel frequency cepstrum coefficient, identify according to HMM the row mode coupling of going forward side by side again and be finally judged as cheating signal by default decision rule, or, be trained for reference model according to HMM;
2. 1. above-mentioned steps be the method for voice activation detection with step, and 3. above-mentioned steps is that method for distinguishing known in keyword;
(5) cheating signal feedback: the cheating signal identifying is added after feeding back to examination hall signal acquisition equipment after blacklist and returns to step (1).
Above-described embodiment is preferred embodiment of the present invention; it is not the restriction to technical solution of the present invention; as long as the technical scheme that can realize on the basis of above-described embodiment without creative work, all should be considered as falling within the scope of the rights protection of patent of the present invention.
Claims (2)
1. the identification of examination hall cheating signal intelligent and an evidence obtaining method of reducing, is characterized in that: comprise the following steps:
(1) examination hall signal acquisition: obtain examination hall signal by detecting or acquisition mode;
(2) signal Modulation Identification: first identify whether FSK modulates, if not, identification is AM modulation or FM modulation;
(3) signal demodulation reduction: if FSK modulation judges whether known type, if so, carry out forwarding step (5) to after FSK demodulation, if not, directly forward step (5) to; If AM modulation is carried out forwarding step (4) to after AM demodulation, if modulating, FM carries out forwarding step (4) to after FM demodulation;
(4) content recognition: the signal after AM demodulation or FM demodulation process is carried out to voice activation detection, then carry out the keyword identification relevant to cheating, if there be the cheating keyword relevant to cheating, forward step (5) to, if do not had, the artificial judgment signal of whether practising fraud, if it is forwards step (5) to, otherwise finishes identification;
(5) cheating signal feedback: the cheating signal identifying is added after feeding back to examination hall signal acquisition equipment after blacklist and returns to step (1).
2. cheating signal intelligent in examination hall according to claim 1 identification and evidence obtaining method of reducing, is characterized in that: in described step (4), content aware step is:
1. preliminary treatment: first carry out FIR bandpass filtering, then divide frame, windowing process;
2. voice are differentiated: adopt the mode of short-time energy and short-time zero-crossing rate to judge to the signal after a point frame, windowing process, determine it is non-speech audio or voice signal;
3. if voice signal, carry out end-point detection, then carry out the feature extraction based on linear prediction cepstrum coefficient coefficient and Mel frequency cepstrum coefficient, identify according to HMM the row mode coupling of going forward side by side again and be finally judged as cheating signal by default decision rule, or, be trained for reference model according to HMM;
2. 1. above-mentioned steps be the method that described voice activation detects with step, and 3. above-mentioned steps is that method for distinguishing known in described keyword.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107077796A (en) * | 2016-03-11 | 2017-08-18 | 深圳市大疆创新科技有限公司 | Method, system and the equipment of the anti-cheating of storage medium, network test |
| CN113514697A (en) * | 2021-04-09 | 2021-10-19 | 广州辰创科技发展有限公司 | Radio signal identification method, equipment and storage medium |
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| EP0676108B1 (en) * | 1992-12-22 | 1996-11-13 | Honeywell Inc. | Apparatus and method for fault detection on redundant signal lines via encryption |
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN102263601A (en) * | 2011-06-09 | 2011-11-30 | 中国工程物理研究院电子工程研究所 | Multi-signal detecting method for broadband |
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| EP0676108B1 (en) * | 1992-12-22 | 1996-11-13 | Honeywell Inc. | Apparatus and method for fault detection on redundant signal lines via encryption |
| JPH0887558A (en) * | 1994-09-20 | 1996-04-02 | Fujitsu General Ltd | Simple medical examination system |
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN102263601A (en) * | 2011-06-09 | 2011-11-30 | 中国工程物理研究院电子工程研究所 | Multi-signal detecting method for broadband |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107077796A (en) * | 2016-03-11 | 2017-08-18 | 深圳市大疆创新科技有限公司 | Method, system and the equipment of the anti-cheating of storage medium, network test |
| CN107077796B (en) * | 2016-03-11 | 2021-03-30 | 深圳市大疆创新科技有限公司 | Storage medium, network test anti-cheating method, system and equipment |
| CN113514697A (en) * | 2021-04-09 | 2021-10-19 | 广州辰创科技发展有限公司 | Radio signal identification method, equipment and storage medium |
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Address after: 610041 188 Wuke west two road, Wuhou District, Chengdu, Sichuan (Wuhou new town administrative committee) Patentee after: Chengdu good Antai education Polytron Technologies Inc Address before: 610046 433 Wuxing five road, Wuhou District, Chengdu, Sichuan Patentee before: Chengdu Jiafa Antai Science And Technology Co., Ltd. |
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