CN102393986A - Illegal lumbering detection method, device and system based on audio frequency distinguishing - Google Patents
Illegal lumbering detection method, device and system based on audio frequency distinguishing Download PDFInfo
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- CN102393986A CN102393986A CN2011102299052A CN201110229905A CN102393986A CN 102393986 A CN102393986 A CN 102393986A CN 2011102299052 A CN2011102299052 A CN 2011102299052A CN 201110229905 A CN201110229905 A CN 201110229905A CN 102393986 A CN102393986 A CN 102393986A
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Abstract
The invention provides an illegal lumbering detection method, device and system based on audio frequency distinguishing. The illegal lumbering detection method can be used for carry out distinguishing detection on illegal lumbering behavior at any time only by collecting field environment sound, has lower technical difficulty and development and use cost, and has higher detection and execution efficiency. Corresponding, the illegal lumbering detection device utilizing the method has the characteristics of low development cost, short period and high efficiency, and is suitable for industrial development and production. At the same time, an illegal lumbering detection system is constructed by virtue of the illegal lumbering detection device with a wireless communication function, thus remote monitoring to illegal lumbering detection is achieved, the position in which the illegal lumbering behavior is judged to happen is determined, and the illegal lumbering behavior is prevented by specifically adopting coping measures. The illegal lumbering detection method, device and system based on audio frequency distinguishing can solve the problems of difficulty in detection of illegal lumbering behavior and high cost in the prior art, and have broad application prospects.
Description
Technical field
The present invention relates to signal Processing and forestry resist technology field, relate in particular to a kind of detection method of felling trees unlawfully, Apparatus and system of differentiating based on audio frequency.
Background technology
The behavior of felling trees unlawfully is meant, the involved party violates forest law and other rules that conserve forests, and does not obtain the forest cutting license, without authorization felling country, collective or forest and the forest of forest or country that contracts to run in person or collective and the behavior of forest that other people are all; Though hold the forest cutting license, violate the scope of forest cutting license regulation and fell country, collective and the forest of other people hilly land alloted for private use or other people operation control and the behavior of forest.The possessory interests of forest have not only been encroached in the behavior of felling trees unlawfully, and cause the forest resourceies loss, the destruction of also causing ecologic environment easily.
At present, rely on the artificial inspection and the masses to find the mode of reporting to the protection of felling trees unlawfully of forest is main, but this protection all have bigger limitation on time and space, and the felling of the molecule of felling trees unlawfully and means of transport advanced person more and more, the inspection difficulty also increased.Also can utilize the fell trees unlawfully monitoring of behavior of satellite remote sensing monitoring technology; The bigger zone of obviously felling trees unlawfully of area but satellite remote sensing monitoring can only be found to fell trees unlawfully is difficult in the very first time to find that the situation of felling trees unlawfully and collective do not have ability to bear high hardware construction, technical support and the running cost of satellite remote sensing monitoring with the individual usually yet.
Summary of the invention
To the above-mentioned deficiency that exists in the prior art, the present invention detects the problem difficult, that cost is high for solving the behavior of felling trees unlawfully in the prior art, proposes a kind of detection method of differentiating based on audio frequency of felling trees unlawfully, and detects to realize low cost, the high efficiency behavior of felling trees unlawfully.For realizing this purpose, the present invention has adopted following technological means:
The detection method of felling trees unlawfully based on audio frequency is differentiated comprises the steps:
A) preset signals intensity threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value;
B) audio collection discriminating step is specially:
B1) control collection duration is the environment voice data of T;
B2) the environment audio data samples of gathering is treated to the environment audio digital signals;
Whether the average signal strength of b3) judging the environment audio digital signals is greater than preset signal strength threshold, if then continue execution in step b4); Otherwise stop juggling to this environment audio digital signals;
B4) handle the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold;
C) accumulative total discriminating step; Be specially: N continuous time repeated execution of steps B), and differentiate the result to N time and add up, if wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than the frequency threshold value of presetting; Then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
This detection method utilization lumbering sound of felling trees unlawfully is relatively large and obviously be different from the characteristics of other ambient sound; Only need detect through just can fell trees unlawfully the at any time differentiation of behavior of the ambient sound of collection site; Than satellite remote sensing monitoring technology with high content of technology, that cost is expensive, the technical difficulty of this method all significantly reduces with the exploitation use cost; And; Only the value of gathering duration T and multiplicity N need be set reasonably; The behavior in case fell trees unlawfully is then differentiated through the audio frequency of short period, by the alarm signal of felling trees unlawfully of output the fell trees unlawfully prompting or the warning of behavior; Just can notify monitor staff or managerial personnel to take corresponding measure to prevent the illegal activities of the molecule of felling trees unlawfully timely; Just know the situation of felling trees unlawfully after the on-the-spot discovery of people can or not arranged after large tracts of land not fell trees unlawfully generation, the detection efficiency of illegal activities has guaranteed the promptness of felling trees unlawfully and detecting thereby effective raising is fell trees unlawfully; Simultaneously; This this detection method value of felling trees unlawfully is carried out the frequency spectrum comparative analysis to the bigger audio frequency of average signal strength and is differentiated; And do not make the frequency spectrum contrast processing for general environment audio frequency; Thereby reduce unnecessary calculation process, help to reduce to fell trees unlawfully and monitor occupancy, strengthen the execution efficient of this detection method of felling trees unlawfully calculation resources.
In the above-mentioned detection method of felling trees unlawfully, particularly, the average signal strength of said audio digital signals obtains through average, mean square value or the root-mean-square value of each sampled point amplitude of computing environment audio digital signals.Because the computing of average, mean square value or the root-mean-square value of each sampled point amplitude of digital signal is fairly simple comparatively speaking, help to improve data processing efficiency and computing robust performance.
Correspondingly, the present invention also provides a kind of detection controller of felling trees unlawfully of realizing the above-mentioned detection method of differentiating based on audio frequency of felling trees unlawfully; For this reason, the present invention has adopted following technological means:
The detection controller of felling trees unlawfully based on audio frequency is differentiated comprises: DBM is used to write down preset signal strength threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value; The audio collection control module, being used to control the collection duration is the environment voice data of T; The voice data modular converter is used for the environment audio data samples of gathering is treated to the environment audio digital signals; The signal intensity discrimination module, whether the average signal strength that is used to judge the environment audio digital signals is greater than preset signal strength threshold, if then start frequency spectrum similarity discrimination module the environment audio digital signals is proceeded frequency spectrum similarity juggling; Otherwise stop juggling to this environment audio digital signals; Frequency spectrum similarity discrimination module; Be used for handling the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold; And; The accumulative total discrimination module; Be used to control said audio collection control module, voice data modular converter, signal intensity discrimination module and frequency spectrum similarity discrimination module N continuous and time repeat audio collection and differentiate operation, and differentiate the result to N time and add up, if wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than the frequency threshold value of presetting; Then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
This detection controller of felling trees unlawfully can adopt the electron device programming with logic control and data processing function to realize; For example single-chip microcomputer, embedded chip, central processing unit (CPU) etc.; Only need the framework of the above-mentioned functional module of programming realization therein can develop completion; Because its technical difficulty is told somebody what one's real intentions are, therefore the human cost of exploitation is also lower, the cycle is shorter, is suitable for industrialized developing and production.
Above-mentioned felling trees unlawfully detects in the controller, and particularly, the average signal strength of said audio digital signals obtains through average, mean square value or the root-mean-square value of each sampled point amplitude of computing environment audio digital signals.Because the computing of average, mean square value or the root-mean-square value of each sampled point amplitude of digital signal is fairly simple comparatively speaking; Adopt these compute modes to help improving to fell trees unlawfully the operation efficiency that detects controller; And the requirement on the hardware that detects controller of reduce realizing felling trees unlawfully helps to control cost.
Simultaneously, the present invention also provides a kind of and detects the pick-up unit of felling trees unlawfully of controller based on above-mentioned felling trees unlawfully; For this reason, the present invention has adopted following technological means:
The pick-up unit of felling trees unlawfully based on audio frequency is differentiated comprises audio collection amplifying circuit and the aforesaid detection controller of felling trees unlawfully; Said audio collection amplifying circuit is used to obtain the environment voice data and carries out processing and amplifying; The said detection controller of felling trees unlawfully is electrically connected with the audio collection amplifying circuit, can gather the environment voice data through the audio collection amplifying circuit and carry out juggling, and when behavior is fell trees unlawfully in judgement, export the alarm signal of felling trees unlawfully.
During use; Can be with this supporting use of pick-up unit and warning device or computing machine of felling trees unlawfully; The pick-up unit of felling trees unlawfully is arranged on monitored trees planting area (adopt certainly hidden set-up mode best); The alarm signal output port of pick-up unit of felling trees unlawfully then is connected to warning device or computing machine through data line etc., with the trigger pip that the alarm signal of felling trees unlawfully of the pick-up unit output of felling trees unlawfully is reported to the police, pointed out as warning device or computing machine, can effectively realize felling trees unlawfully and detect and report to the police.
As a kind of selectable improvement project, in the above-mentioned pick-up unit of felling trees unlawfully, also comprise the alarm that is electrically connected with the detection controller of felling trees unlawfully, said alarm detects controller output by felling trees unlawfully the alarm signal of felling trees unlawfully triggers warning.The improvement of this scheme is alarm is integrated in the pick-up unit of felling trees unlawfully, owing to be very ripe prior art through the alarm that takes place, mode such as luminous, literal demonstration is reported to the police, therefore sets up the development difficulty that alarm can not increase device; And the pick-up unit of felling trees unlawfully can carry out onsite alarming by its built-in alarm, helps to point out the illegal activities that near the people that fell trees unlawfully the behavior scene find to fell trees unlawfully molecule immediately and prevents, and perhaps draws back the molecule of felling trees unlawfully with fear and stops continuing crime.
As another selectable improvement project; In the above-mentioned pick-up unit of felling trees unlawfully; Also comprise with felling trees unlawfully and detect the wireless communication module that controller is electrically connected, be used for detecting the alarm signal of felling trees unlawfully that controller exports and be treated to the alarming wireless signal and externally sending of felling trees unlawfully felling trees unlawfully.The improvement of this scheme is integrated wireless communication function in the pick-up unit of felling trees unlawfully; Radio communication with realize felling trees unlawfully pick-up unit and warning device or computing machine; Thereby can avoid in monitored trees planting area, laying the communications cable, solve in the difficult problem of part trees planting area wiring; And the wireless communication module technology maturation, be widely used, can not increase the development difficulty of device.
Further, the present invention also provides a kind of detection system of felling trees unlawfully that realizes by the above-mentioned pick-up unit of felling trees unlawfully; For this reason, the present invention has adopted following technological means:
A kind of detection system of differentiating based on audio frequency of felling trees unlawfully comprises monitor terminal and distributed and arranged several above-mentioned pick-up units of felling trees unlawfully that contain wireless communication module in monitored trees planting area; Each pick-up unit of felling trees unlawfully all is preset with the mailing address sign in the system; The said pick-up unit of felling trees unlawfully can the wireless forwarding of wireless communication module send the additional alarming wireless signal of felling trees unlawfully that has mailing address to identify to monitor terminal in judging when felling trees unlawfully behavior the pick-up unit of felling trees unlawfully through cordless communication network or through other; Said monitor terminal can confirm to be judged the position of the behavior of felling trees unlawfully according to the mailing address sign that the alarming wireless signal of felling trees unlawfully that receives adds, and points out the positional information of felling trees unlawfully accordingly.
The monitor terminal that monitor staff or managerial personnel can utilize this scheme to fell trees unlawfully in the detection system carries out remote monitor; In time know the behavior of whether felling trees unlawfully in the monitored trees planting area by wireless communication technology; And can confirm to be judged the position of the behavior of felling trees unlawfully, be more convenient for taking targetedly counter-measure to prevent the crime of felling trees unlawfully; Simultaneously; The pick-up unit of felling trees unlawfully in the system can send the alarming wireless signal of felling trees unlawfully through cordless communication network; For remote location, can't be smoothly directly connecting the pick-up unit of felling trees unlawfully of going up cordless communication network then can be through wireless forwarding realization of wireless communication module in other pick-up unit of felling trees unlawfully and communicating by letter of monitor terminal; Promptly be equivalent to utilize fell trees unlawfully in the system wireless communication module of pick-up unit to realize radio communication relaying forwarding capability; Thereby can reduce even avoid the use of the radio communication repeater of independent setting, help to reduce the cost that the detection system cordless communication network builds of felling trees unlawfully; Because these above-mentioned favorable factors, make the detection system of felling trees unlawfully of this scheme be specially adapted to the large-area forestry monitoring of felling trees unlawfully.
As improvement project; In the above-mentioned detection system of felling trees unlawfully, each pick-up unit of felling trees unlawfully can also be under the state of not judging the behavior of felling trees unlawfully sends the additional safety feedback wireless signal that has mailing address to identify with the wireless forwarding of wireless communication module of felling trees unlawfully through cordless communication network or through other in pick-up unit of fixing cycle to monitor terminal in the said system; Said monitor terminal can also be confirmed the position of the pick-up unit of felling trees unlawfully of transmission safety feedback wireless signal according to the additional mailing address sign of the safety feedback wireless signal that receives, and points out corresponding home information.In the detection system of felling trees unlawfully of this scheme; Monitor staff or managerial personnel can be by the clear and definite security situations of knowing trees planting area to be detected of home information of monitor terminal prompting; Simultaneously can also recognize the ruuning situation that is distributed in each pick-up unit of felling trees unlawfully in the monitored trees planting area; When monitor staff or the managerial personnel pick-up unit of finding to fell trees unlawfully for certain or some had not both been received the home information of its transmission, do not received its positional information of felling trees unlawfully yet; Show that then it installs self or fault has appearred in wireless communication link, thereby establishment officer fixes a breakdown in time, recovers its measuring ability.
In the above-mentioned detection system of felling trees unlawfully, particularly, said monitor terminal is computing machine or the portable terminal with radio communication function.Adopt computing machine as monitor terminal, be applicable to the situation that fixedly installs the control point; Adopt portable terminal as monitor terminal, be more convenient for realizing with oneself, the monitoring of felling trees unlawfully at any time.
In sum; The detection method of felling trees unlawfully, the Apparatus and system that the present invention is based on the audio frequency differentiation can solve the behavior of felling trees unlawfully in the prior art and detect the problem difficult, that cost is high; In country, collective or all forest of individual and forest planting area, all can use; And have higher detection efficient and carry out efficient, can improve the promptness and the accuracy of felling trees unlawfully and detecting.
Description of drawings
Fig. 1 is the fell trees unlawfully FB(flow block) of detection method of the present invention;
Fig. 2 is fell trees unlawfully a kind of embodiment of pick-up unit of the present invention;
Fig. 3 is fell trees unlawfully another embodiment of pick-up unit of the present invention;
Fig. 4 is fell trees unlawfully another embodiment of pick-up unit of the present invention;
Fig. 5 is fell trees unlawfully a kind of embodiment of detection system of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is further described, following embodiment is only as the explanation of the specific embodiment of the invention, so that understand, and not as the restriction to protection domain of the present invention.
Embodiment one:
Present embodiment relates to a kind of pick-up unit of felling trees unlawfully; As shown in Figure 2; This pick-up unit of felling trees unlawfully mainly is made up of the audio collection amplifying circuit and the detection controller of felling trees unlawfully, and comprises also in the device that certainly promising audio collection amplifying circuit detects the power supply (not shown) that controller is supplied power with felling trees unlawfully.The audio collection amplifying circuit mainly is made up of microphone and audio frequency discharge circuit; Be used to obtain the environment voice data and carry out processing and amplifying; The commercially available acquisition of microphone, audio frequency discharge circuit can be adopted discharge circuit commonly used in the field such as LM358 typical operation amplifying circuit.The detection controller of felling trees unlawfully is electrically connected with the audio collection amplifying circuit; Be used for gathering the environment voice data and carry out juggling through the audio collection amplifying circuit; And export the alarm signal of felling trees unlawfully when felling trees unlawfully behavior judging; Can adopt electron device programming to realize, for example single-chip microcomputer, embedded chip, central processing unit (CPU) etc. with logic control and data processing function.Detect controller for felling trees unlawfully and realize the concrete grammar of felling trees unlawfully and detecting based on the audio frequency differentiation, the present invention has adopted method flow design as shown in Figure 1, and concrete steps are following:
Steps A), preset signals intensity threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value;
Step B), the audio collection discriminating step, be specially:
B1) control collection duration is the environment voice data of T;
B2) the environment audio data samples of gathering is treated to the environment audio digital signals;
Whether the average signal strength of b3) judging the environment audio digital signals is greater than preset signal strength threshold, if then continue execution in step b4); Otherwise stop juggling to this environment audio digital signals;
B4) handle the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold;
Step C), accumulative total discriminating step; Be specially: N continuous time repeated execution of steps B); And differentiate the result to N time and add up; If wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than preset frequency threshold value, then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
Divided B in this method), C) two big steps carry out the detecting operation of felling trees unlawfully differentiated based on audio frequency, mainly from improving implementation rate and reducing these two aspects of False Rate and take in.Step B) designs in order to improve implementation rate.Because the environment in the trees planting area is normally relatively more quiet except the crowd activity is arranged; And no matter be to saw the Shi Douhui that falls trees with feller such as saw or axes to send the bigger sound, and the lumbering acoustic phase has tangible audible spectrum characteristic for other ambient sounds.Step B) utilized lumbering sound relatively large and obviously be different from the characteristics of other ambient sound just; Earlier by the benchmark of a preset signal strength threshold as the home intensity of sound; Whether judgement has surpassed the home intensity of sound through actual acquisition and the average signal strength of handling the environment audio digital signals that obtains; Can not think that then all are normal in the trees planting area if surpass; There is no need to carry out again further frequency spectrum and differentiate, have other incident to send the bigger sound in the environment, at this moment just start the frequency spectrum discriminating step if surpassed then explained; With the judgement sound that behavior or other human activity sent of felling trees unlawfully; Processing can reduce unnecessary fast Fourier transformation operation and frequency spectrum contrast computing like this, helps to reduce to fell trees unlawfully and monitors the occupancy to calculation resources, strengthens the implementation rate that this is fell trees unlawfully and detects.Step C) designs for reducing False Rate.Because circumstance complication in the trees planting area may coincidence frequency spectrum other sound similar in appearance to lumbering sound occur, and to adopt the lumbering sound of the felling tool of some felling such as axe type be intermittently interrupted.Consider these factors; Step C of the present invention) employing repeatedly repeats the audio collection differentiation, accumulative total is judged the number of times such discrimination principle of environment audio digital signals similar in appearance to the lumbering audio frequency; Can avoid coincidence to cause occurring erroneous judgement similar in appearance to other sound of lumbering sound; That can identify effectively also that continuous lumbering sound that saw etc. sends and axe etc. send is interrupted lumbering sound, guarantees the higher detection accuracy.
Step B in this method) in; Whether the environment audio digital signals has surpassed the home intensity of sound is weighed through its average signal strength; Therefore the length of the collection duration T of environment audio frequency does not produce materially affect for the differentiation of intensity of sound; But influence the operand and the whole duration of felling trees unlawfully and detecting of average signal strength; Therefore gather duration T and can get less value, never influence detects quality and improves the detection efficiency angle and consider, its span is that 0.01 second≤T≤0.5 is second comparatively suitable; And the average signal strength of environment audio digital signals can adopt multiple compute mode to obtain; The average power content of computing environment audio digital signals for example; The perhaps average of each sampled point amplitude of computing environment audio digital signals, mean square value, root-mean-square value etc.; Suggestion adopts average, mean square value or the root-mean-square value of each sampled point amplitude of environment audio digital signals to obtain average signal strength; Because the computing of average, mean square value, root-mean-square value is fairly simple comparatively speaking, help to improve data processing efficiency and computing robust performance; Preset signal strength threshold then need consider specifically to obtain the algorithm of average signal strength, rule of thumb or the actual experiment situation of home intensity of sound carry out value; Preset lumbering audible spectrum data then can be through handling acquisition through Fast Fourier Transform (FFT) behind the actual acquisition lumbering voice data; Can preset a kind of lumbering audible spectrum data of felling tool; Also can preset the lumbering audible spectrum data of several kinds of felling tools commonly used respectively, as long as the frequency spectrum data of environment audio digital signals is the decidable behavior of felling trees unlawfully similar in appearance to any lumbering audible spectrum data; Similarity contrast as for frequency spectrum data; Those skilled in the art can design various similarity contrast algorithms and realize; As long as can judge the frequency spectrum data of environment audio digital signals and the frequency band distribution similarity degree of the lumbering audible spectrum data of presetting, and a lot of introductions about the frequency spectrum data similarity algorithm are also arranged in the existing document, belong to techniques well known; This technology is not a design focal point of the present invention, no longer adds to introduce; And preset similarity threshold need consider that then the similarity of the concrete frequency spectrum data that adopts contrasts algorithm, rule of thumb comes value.And at step C) in, multiplicity N does not help to reduce False Rate if value is excessive, can influence the whole duration of felling trees unlawfully and detecting on the contrary, therefore advises that span is that 5≤N≤20 are comparatively suitable; And preset frequency threshold value naturally should be smaller or equal to the value of multiplicity N, and its concrete value also needs rule of thumb to confirm, if use character N
0The expression frequency threshold value, the span of suggestion frequency threshold value is 2≤N
0≤N/2.
The behavior of felling trees unlawfully that realizes above-mentioned design detects; Felling trees unlawfully to detect should possess DBM, audio collection control module, signal intensity discrimination module, frequency spectrum similarity discrimination module at least and add up these five functional modules of discrimination module in the controller, wherein:
DBM is used to write down preset signal strength threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value;
It is the environment voice data of T that the audio collection control module is used to control the collection duration;
The voice data modular converter is used for the environment audio data samples of gathering is treated to the environment audio digital signals;
Whether the average signal strength that the signal intensity discrimination module is used to judge the environment audio digital signals is greater than preset signal strength threshold, if then start frequency spectrum similarity discrimination module the environment audio digital signals is proceeded frequency spectrum similarity juggling; Otherwise stop juggling to this environment audio digital signals;
Frequency spectrum similarity discrimination module is used for handling the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold;
The accumulative total discrimination module is used to control the inferior audio collection that repeats of said audio collection control module, voice data modular converter, signal intensity discrimination module and frequency spectrum similarity discrimination module N continuous and differentiates operation; And differentiate the result to N time and add up; If wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than preset frequency threshold value; Then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
In the present embodiment, the commercially available acquisition of the microphone in the audio collection amplifying circuit, the audio frequency discharge circuit adopts LM358 typical operation amplifying circuit; The detection controller of felling trees unlawfully then selects for use the SAM7S64 microprocessor of Atmel company to realize; Because the SAM7S64 microprocessor internal has been integrated with 10bit accuracy A/D converter; Can directly realize the function of voice data modular converter; Need not to programme to the voice data modular converter again, be beneficial to the simplification development process, and the SRAM storer of the Flash storer of the built-in 64KB of SAM7S64 microprocessor and 6KB; Abundant space store database data and logical program data are arranged, and other functional module of locating beyond the voice data modular converter then realizes through programming; As for the SAM7S64 microprocessor circuit use and with the electric connection mode of audio collection amplifying circuit, obtain in instructions that all can be through the SAM7S64 microprocessor and the related development data, this paper then is not described in detail; Power supply preferably adopts lithium battery independently-powered, can certainly adopt the mode of wired connection to carry out mains-supplied.
During use, can be with this supporting use of pick-up unit and warning device or computing machine of felling trees unlawfully.The pick-up unit of felling trees unlawfully is arranged on monitored trees planting area, the eminence of fixed placement on trees for example, perhaps shallow embedding is preferably adopted hidden set-up mode on the ground of trees planting area etc., and the malice of the molecule of avoiding felling trees unlawfully is damaged; The alarm signal output port of pick-up unit of felling trees unlawfully then is connected to warning device or computing machine through data line etc.; Trigger pip so that the alarm signal of felling trees unlawfully of the pick-up unit output of felling trees unlawfully is reported to the police, pointed out as warning device or computing machine can effectively realize felling trees unlawfully and detect and warning.
Certainly; The pick-up unit of felling trees unlawfully of present embodiment can inner integrated alarm device, and is as shown in Figure 3, and alarm detects controller and is electrically connected with felling trees unlawfully; The alarm signal of felling trees unlawfully that detects controller output by felling trees unlawfully triggers reports to the police; Realizing the onsite alarming function, prompting fell trees unlawfully near the behavior scene people find immediately to fell trees unlawfully molecule illegal activities and prevent, perhaps draw back the molecule of felling trees unlawfully with fear and stop continuing crime.Can also be in the inner integrated wireless communication module of the pick-up unit of felling trees unlawfully; As shown in Figure 4; Wireless communication module detects controller and is electrically connected with felling trees unlawfully, and the alarm signal of felling trees unlawfully that is used for detecting felling trees unlawfully controller output is treated to the alarming wireless signal and externally sending of felling trees unlawfully, with the fell trees unlawfully radio communication of pick-up unit and warning device or computing machine of realization; Thereby can avoid in monitored trees planting area, laying the communications cable, solve in the difficult problem of part trees planting area wiring.
Embodiment two:
Present embodiment provides a kind of detection system of felling trees unlawfully; Referring to Fig. 5; This system comprises monitor terminal 1 and distributed and arranged several pick-up units 2 of felling trees unlawfully at monitored trees planting area 3; The pick-up unit 2 of wherein felling trees unlawfully just adopts the pick-up unit of felling trees unlawfully described in the embodiment one, and through setting up in the system communicating by letter of each fell trees unlawfully pick-up unit 2 and monitor terminal 1, monitor terminal promptly capable of using is monitored the behaviors of felling trees unlawfully in the monitored trees planting area 3.Certainly, the pick-up unit 2 of felling trees unlawfully in the system can adopt the wired connection mode to set up with communicating by letter of monitor terminal 1.But consider for the bigger trees planting area of area; Cable possibly occur lays apart from situation such as the easy faults of difficult, the complicated wiring of oversize, changeable landform cable laying; The detection system of felling trees unlawfully of present embodiment adopts the pick-up unit of felling trees unlawfully that is integrated with wireless communication module among the embodiment one, with the mode of radio communication set up fell trees unlawfully pick-up unit 2 in the communicating by letter of monitor terminal 1; And; Also in the pick-up unit 2 of felling trees unlawfully, increase a preset parameter; It is the mailing address sign; Mailing address sign can be preset in detecting in the controller felling trees unlawfully of the pick-up unit 2 of felling trees unlawfully, and also can be preset in the wireless communication module of the pick-up unit 2 of felling trees unlawfully, so that monitor terminal 1 utilizes mailing address sign confirm the to fell trees unlawfully position of pick-up unit 2.The wireless communication signals of all pick-up unit 2 positions of felling trees unlawfully is all comparatively good in the detection system if fell trees unlawfully, and the pick-up unit 2 of then felling trees unlawfully can be directly through 4 realizations of existing cordless communication network with the radio communication of monitor terminal 1; Some or all pick-up unit 2 positions of felling trees unlawfully are remote in the detection system if fell trees unlawfully; Wireless communication signals is not so good; Can't directly connect smoothly and go up cordless communication network 4; Then can utilize the wireless communication module in the pick-up unit 2 of felling trees unlawfully to realize the relaying forwarding capability, form the wireless network of self-organization, as long as have the pick-up unit 2 of felling trees unlawfully normally to carry out the normal operation that radio communication can guarantee system with monitor terminal 1 in the system.In the detection system of felling trees unlawfully of present embodiment, the pick-up unit 2 of felling trees unlawfully can the wireless forwarding of wireless communication module send the additional alarming wireless signal of felling trees unlawfully that has mailing address to identify to monitor terminal 1 in judging when felling trees unlawfully behavior the pick-up unit 2 of felling trees unlawfully through cordless communication network 4 or through other; 1 position that can confirm to be judged the behavior of felling trees unlawfully according to the additional mailing address sign of the alarming wireless signal of felling trees unlawfully that receives of monitor terminal; Point out the positional information of felling trees unlawfully accordingly then; The corresponding positional information of felling trees unlawfully of pointing out can be geographical graphical information or the Word message that shows, also can be the voice messaging reported etc.; Monitor staff or managerial personnel then can clearly be known the position of felling trees unlawfully according to the positional information of felling trees unlawfully of monitor terminal prompting, more can take counter-measure targetedly, prevent the criminal offence of felling trees unlawfully, and arrest the molecule of felling trees unlawfully.
As further improvement; Each pick-up unit 2 of felling trees unlawfully can also design under the state of not judging the behavior of felling trees unlawfully and send the additional safety feedback wireless signal that the mailing address sign is arranged with the fixing cycle to monitor terminal 1 in the detection system of felling trees unlawfully of present embodiment, and send mode also is the perhaps wireless forwarding through wireless communication module in other pick-up unit 2 of felling trees unlawfully through cordless communication network 4; Monitor terminal 1 can confirm to send the position of pick-up unit 2 of felling trees unlawfully of safety feedback wireless signal according to the additional mailing address sign of the safety feedback wireless signal that receives, and points out corresponding home information; Like this; Monitor staff or managerial personnel then can be known the security situation of trees planting area to be detected by the home information that monitor terminal is periodically pointed out; Simultaneously can also recognize the ruuning situation that is distributed in each pick-up unit of felling trees unlawfully in the monitored trees planting area; Both do not received the home information of its transmission, do not received its positional information of felling trees unlawfully yet when monitor staff or the managerial personnel pick-up unit of finding to fell trees unlawfully, show that then it installs self or fault has appearred in wireless communication link, thereby establishment officer had fixed a breakdown in time for certain or some; Recover its measuring ability, reach the effect of system failure prompting.
This shows; The monitor terminal that monitor staff or managerial personnel can utilize present embodiment to fell trees unlawfully in the detection system carries out remote monitor; In time know the behavior of whether felling trees unlawfully in the monitored trees planting area by wireless communication technology, also make this detection system of felling trees unlawfully be specially adapted to the large-area forestry monitoring of felling trees unlawfully.Monitor terminal then can adopt the computing machine with radio communication function, is applicable to the situation that fixedly installs the control point, for example in the monitoring office of computer installation in the city as monitor terminal, to the mountain forest monitoring of felling trees unlawfully; Monitor terminal also can adopt portable terminals such as mobile phone, vehicle-mounted computer, so that monitor staff or managerial personnel carry out with oneself, the monitoring of felling trees unlawfully at any time.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the detection method of differentiating based on audio frequency of felling trees unlawfully is characterized in that, comprises the steps:
A) preset signals intensity threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value;
B) audio collection discriminating step is specially:
B1) control collection duration is the environment voice data of T;
B2) the environment audio data samples of gathering is treated to the environment audio digital signals;
Whether the average signal strength of b3) judging the environment audio digital signals is greater than preset signal strength threshold, if then continue execution in step b4); Otherwise stop juggling to this environment audio digital signals;
B4) handle the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold;
C) accumulative total discriminating step; Be specially: N continuous time repeated execution of steps B), and differentiate the result to N time and add up, if wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than the frequency threshold value of presetting; Then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
2. the detection method of felling trees unlawfully according to claim 1 is characterized in that, the average signal strength of said audio digital signals obtains through average, mean square value or the root-mean-square value of each sampled point amplitude of computing environment audio digital signals.
3. the detection controller of differentiating based on audio frequency of felling trees unlawfully is characterized in that, comprising:
DBM is used to write down preset signal strength threshold, lumbering audible spectrum data, similarity threshold and frequency threshold value;
The audio collection control module, being used to control the collection duration is the environment voice data of T;
The voice data modular converter is used for the environment audio data samples of gathering is treated to the environment audio digital signals;
The signal intensity discrimination module, whether the average signal strength that is used to judge the environment audio digital signals is greater than preset signal strength threshold, if then start frequency spectrum similarity discrimination module the environment audio digital signals is proceeded frequency spectrum similarity juggling; Otherwise stop juggling to this environment audio digital signals;
Frequency spectrum similarity discrimination module; Be used for handling the frequency spectrum data that obtains the environment audio digital signals through Fast Fourier Transform (FFT); And carry out the similarity contrast with preset lumbering audible spectrum data; If the similarity of the two, judges then that this environment audio digital signals is similar in appearance to the lumbering audio frequency greater than preset similarity threshold; And,
The accumulative total discrimination module; Be used to control the inferior audio collection that repeats of said audio collection control module, voice data modular converter, signal intensity discrimination module and frequency spectrum similarity discrimination module N continuous and differentiate operation; And differentiate the result to N time and add up; If wherein judge the environment audio digital signals similar in appearance to the cumulative number of lumbering audio frequency greater than preset frequency threshold value, then judge the behavior of felling trees unlawfully, export the alarm signal of felling trees unlawfully.
4. the detection controller of felling trees unlawfully according to claim 3 is characterized in that the average signal strength of said audio digital signals obtains through average, mean square value or the root-mean-square value of each sampled point amplitude of computing environment audio digital signals.
5. the pick-up unit of differentiating based on audio frequency of felling trees unlawfully is characterized in that, comprises audio collection amplifying circuit and the detection controller of felling trees unlawfully as claimed in claim 3; Said audio collection amplifying circuit is used to obtain the environment voice data and carries out processing and amplifying; The said detection controller of felling trees unlawfully is electrically connected with the audio collection amplifying circuit, can gather the environment voice data through the audio collection amplifying circuit and carry out juggling, and when behavior is fell trees unlawfully in judgement, export the alarm signal of felling trees unlawfully.
6. the pick-up unit of felling trees unlawfully according to claim 5 is characterized in that, also comprises the alarm that is electrically connected with the detection controller of felling trees unlawfully, and said alarm detects controller output by felling trees unlawfully the alarm signal of felling trees unlawfully triggers warning.
7. according to claim 5 or the 6 described pick-up units of felling trees unlawfully; It is characterized in that; Also comprise with felling trees unlawfully and detect the wireless communication module that controller is electrically connected, be used for detecting the alarm signal of felling trees unlawfully that controller exports and be treated to the alarming wireless signal and externally sending of felling trees unlawfully felling trees unlawfully.
8. the detection system of differentiating based on audio frequency of felling trees unlawfully is characterized in that, comprises monitor terminal and distributed and arranged several pick-up units of felling trees unlawfully as claimed in claim 7 in monitored trees planting area;
Each pick-up unit of felling trees unlawfully all is preset with the mailing address sign in the system; The said pick-up unit of felling trees unlawfully can the wireless forwarding of wireless communication module send the additional alarming wireless signal of felling trees unlawfully that has mailing address to identify to monitor terminal in judging when felling trees unlawfully behavior the pick-up unit of felling trees unlawfully through cordless communication network or through other;
Said monitor terminal can confirm to be judged the position of the behavior of felling trees unlawfully according to the mailing address sign that the alarming wireless signal of felling trees unlawfully that receives adds, and points out the positional information of felling trees unlawfully accordingly.
9. the detection system of felling trees unlawfully according to claim 8; It is characterized in that each pick-up unit of felling trees unlawfully can also be under the state of not judging the behavior of felling trees unlawfully sends the additional safety feedback wireless signal that has mailing address to identify with the wireless forwarding of wireless communication module of felling trees unlawfully through cordless communication network or through other in pick-up unit of fixing cycle to monitor terminal in the said system;
Said monitor terminal can also be confirmed the position of the pick-up unit of felling trees unlawfully of transmission safety feedback wireless signal according to the additional mailing address sign of the safety feedback wireless signal that receives, and points out corresponding home information.
10. according to Claim 8 or the 9 described detection systems of felling trees unlawfully, it is characterized in that said monitor terminal is computing machine or the portable terminal with radio communication function.
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| CN2011102299052A CN102393986B (en) | 2011-08-11 | 2011-08-11 | Illegal lumbering detection method, device and system based on audio frequency distinguishing |
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| CN2011102299052A CN102393986B (en) | 2011-08-11 | 2011-08-11 | Illegal lumbering detection method, device and system based on audio frequency distinguishing |
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