CN1512690A - TV signal content transmission safety monitoring system - Google Patents
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- CN1512690A CN1512690A CNA021592349A CN02159234A CN1512690A CN 1512690 A CN1512690 A CN 1512690A CN A021592349 A CNA021592349 A CN A021592349A CN 02159234 A CN02159234 A CN 02159234A CN 1512690 A CN1512690 A CN 1512690A
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Abstract
This invention relates to a TV signal content transmission safety monitor system and its method which monitors acoustic-image character data sequences got from picking up acoustic images, represented by pulse waveforms laminating on the flat zone behind the back porch burst head of playing signal synchronous head after sending the image signals carrying acoustic-image character data sequence via coherent TV channels, a safely monitor special receiver receives acoustic-image signals to pick up the received and resumed sent acoustic-image character data sequence to compare the two so as to judge if the transferred TV signals are corrected or not.
Description
Technical field
The present invention relates to a kind of signal transmission security monitoring system, refer to especially whether a kind of monitoring TV signal content that is used for is subjected to safety monitoring system and the method that other undesirable persons attack, whether the transmission content is distorted, replaced in transmission course.The present invention relates to national security, national vital interests,, will cause great destruction, produce baneful influence normal broadcast of China broadcasting and TV system in case the undesirable person knows the whether method of safety of China's broadcasting and TV system monitoring TV signal content delivery.
Background technology
Along with information technology and development of internet technology, TV is as a kind of important communications media, become that the numerous common people concern oneself with national affairs, the important tool of work and study, amusement and recreation.For masses provide health, positive television content is the most basic requirement of television broadcasting.Just because of this, television content begins to become the object that the undesirable person attacks.For example, the Falun Gong practitioner just once utilized the TV signal of a certain frequency range to propagate the reaction speech, therefore, this just needs vast radio and television worker adopt suitable technological means that television content is monitored, and differentiates that in real time the TV signal that receives is whether in full accord with the TV signal that TV station sends.
Safety monitoring method for the TV signal content belongs to secure content, is confidential, so, for the pluses and minuses of prior art, can't comment at this.
But from present existing technical data analysis as can be known, present normally used monitoring technology is from the angle analysis of monitoring, and it is conceived to the monitoring TV signal transmission quality, rather than the TV signal content of monitoring transmission itself; Angle analysis from identification, it is behind the full detail of comprehensively having grasped identifying object and recognition objective, can carry out the identification of the true and false, when only grasping side's information, that is to say, lack when making a start information when having only receiving end information, prior art just can not be discerned the true and false of receiver signal; From the angle analysis that audio and video information extracts, prior art is to rebuild the original sound and the digital signal of image with the code check of trying one's best few under certain fidelity, and technology is comparatively complicated.
In forming process of the present invention, also once considered the other technologies scheme.For example: making a start of TV signal, insert some additional informations of making an appointment (for example: station symbol, password etc.), if receiving end can not correctly be monitored the information of insertion, then the decidable TV signal has been suffered destruction in transmission course.Yet when the saboteur has taked more brilliant technological means, for example: when destroying the TV audio-visual signal, but kept these insertion information, receiving end just can't be perceived this destruction.Because the present invention do not insert additional information, do not have this defective, thereby can perceive various and TV signal relevant destruction of TV signal content in transmission course.
Summary of the invention
The purpose of this invention is to provide a kind of TV signal content delivery safety monitoring system simple in structure, safe and reliable, willing, whether the TV signal content that this safety monitoring system can be discerned receiving end quickly and accurately is consistent with the TV signal content of making a start; And the signal that can only receive according to receiving end can differentiate rapidly and reliably whether receiver signal is consistent with originating terminal signal, judge whether content is replaced, distorts in the transmission course.
For achieving the above object, the present invention takes following technical scheme: a kind of TV signal content delivery safety monitoring system, and it comprises make a start subsystem and receiving end subsystem;
The described subsystem of making a start comprises that extraction unit, the image feature data sequence of sound characteristic data sequence are extracted and acoustic image characteristic sequence forms unit, the stack of imaging characteristic data sequence and transmitting element; The subsystem of making a start is mainly finished the stack and the sending function of the extraction of imaging characteristic data sequence, imaging characteristic data sequence and vision signal;
Described receiving end subsystem comprises comparison, the judging unit that receives sound characteristic data sequence extraction unit, receives the extraction of image feature data sequence and receive imaging characteristic data sequence formation unit, sends imaging characteristic data sequence recovery unit and two row characteristics; The receiving end subsystem is mainly finished the sound that extracts in the received television signal and image slices characteristic sequence and it is formed imaging characteristic data sequence, recovers these two data sequences of imaging characteristic data sequence, comparison and judgement of making a start and sending.
A kind of TV signal content delivery safety monitoring method, it may further comprise the steps:
Step 1: extract: the subsystem of making a start self extracts the imaging characteristic data sequence from sound and picture signal stream;
Step 2: send: the subsystem of making a start is attached to the characteristic sequence on the composite video signal with specific impulse waveform and together sends with picture signal;
Step 3: receive: receiving end subsystem received television signal;
Step 4: extract: the receiving end subsystem from the sound that receives and image stream by the Rule Extraction imaging characteristic data sequence of making a start identical;
Step 5: recover: the receiving end subsystem recovers the imaging characteristic data sequence of making a start and sending according to the impulse waveform that is attached on the CVBS;
Step 6: relatively and judge: the receiving end subsystem relatively and judge the imaging characteristic data sequence of extracting and recovering, whether judgement/discriminating TV signal replaced or distorted in transmission course.
The present invention relates to a kind of monitoring TV signal content technology of safety whether in transmission course, it comprises extraction, transmission and the reception monitoring technology of imaging characteristic data sequence.The present invention realizes whether safe principle is the monitoring TV signal content delivery: the subsystem of making a start self extracts the imaging characteristic data sequence from sound and picture signal stream; Then, the imaging characteristic data sequence being attached to composite video signal (CVBS) in the mode (being the Data Labels burst signal) of dedicated pulse shape goes up and together sends with picture signal.After the receiving end subsystem receives TV signal; From the sound that receives and image stream by the Rule Extraction imaging characteristic data sequence of making a start identical; Simultaneously, recover the imaging characteristic data sequence of making a start and sending according to the impulse waveform that is attached on the CVBS; At last, relatively and judge whether these two data sequences are identical, thereby whether judgement/discriminating TV signal is replaced or distorted in transmission course.
Description of drawings
Fig. 1 is the safety monitoring system block diagram of system of the present invention
Fig. 2 is the present invention's subsystem theory diagram of making a start
Fig. 3 is a sound characteristic data sequence extraction unit theory diagram of the present invention
Fig. 4 is the another kind of sound characteristic data sequence of the present invention extraction unit theory diagram
Fig. 5 is a receiving end subsystem theory diagram of the present invention
Fig. 6 is data interpretation unit theory diagram in the receiving end subsystem of the present invention
Fig. 7 is the waveform and the mutual time chart of the relevant signal of the present invention
Code implication brief description in the accompanying drawing:
CVBS: composite picture signal; AUDIO: voice signal; AT: sound characteristic; Y: luminance signal; Hs: line synchronizing signal; Fs: Frame identification signal; CK: the clock signal phase-locked with Hs; SW: sampling window signal; BW: pulse train window signal; BU: Data Labels burst signal; DK: data are read clock; HED: the imaging characteristic data sequence of making a start, HED=1, full line high level, HED=0, full line low level; HEDB:BU is waveform after the HED modulation, HED=1, and this row has waveform, HED=0, this row does not have waveform; LOD: receiving end imaging characteristic data sequence, LOD=1, full line high level, LOD=0, full line low level.
Embodiment
For the present invention is described better, below present invention will be described in detail with reference to the accompanying sound and the image feature data sequence is extracted, sends, received and the principle and the implementation of monitoring.
As shown in Figure 1, TV signal content delivery safety monitoring system of the present invention mainly comprises the two large divisions: make a start subsystem and receiving end subsystem.The subsystem of making a start comprises that extraction unit 1, the image feature data sequence of sound characteristic data sequence are extracted and acoustic image characteristic sequence forms unit 2, the stack of imaging characteristic data sequence and transmitting element 3.The receiving end subsystem comprises comparison, the judging unit 7 that receives sound characteristic data sequence extraction unit 4, receives the extraction of image feature data sequence and receive imaging characteristic data sequence formation unit 5, sends imaging characteristic data sequence recovery unit 6 and two row characteristics.
The subsystem of making a start is mainly finished the stack and the sending function of the extraction of imaging characteristic data sequence, imaging characteristic data sequence and vision signal.The receiving end subsystem is mainly finished received television signal, is extracted the imaging characteristic data sequence in the TV signal, these two data sequences of imaging characteristic data sequence, comparison and judgement that recovery is made a start and sent.
The object of safety monitoring system of the present invention monitoring is the imaging characteristic data sequence, and this imaging characteristic data sequence is extracted from the TV signal that receiving end receives, it with make a start, the picture material of receiving end is directly relevant.When TV signal under attack or when distorting in transmission course, the imaging characteristic data sequence of extracting from TV signal must change, through being found with the imaging characteristic data sequence comparison of making a start, after judging, so, the present invention is the small conversion of surveillance map image signal content in transmission course very effectively, prevents that the phenomenon that TV signal content in transmission is replaced, distorts from taking place.
Its operation principle is: the subsystem of making a start self extracts the imaging characteristic data sequence from sound and picture signal stream; Then, the characteristic sequence being attached to composite video signal (CVBS) in the mode (being the Data Labels burst signal) of dedicated pulse shape goes up and together sends with picture signal.After the receiving end subsystem receives TV signal; From the sound that receives and image stream by the Rule Extraction imaging characteristic data sequence of making a start identical; Simultaneously, recover the imaging characteristic data sequence of making a start and sending according to the impulse waveform that is attached on the CVBS; At last, relatively and judge this two data sequences, whether judgement/discriminating TV signal is replaced or distorted in transmission course.
Fig. 2 is the present invention's subsystem theory diagram of making a start.As shown in the figure, voice signal AUDIO to be sent directly transmits sound characteristic data AT to microprocessor CPU 24 behind sound characteristic extraction unit 1.After the composite video signal CVBS to be sent that makes a start was input to emitter follower 21, its output was divided into two-way, and one the tunnel send low pass and sync separator 22, and addition or phase embedding device 3 are sent in another road.Low pass and sync separator 22 have 3 outputs, and they are respectively brightness signal Y, frame identification signal Fs and line synchronizing signal Hs.Y-signal send CPU 24 after A/D converter 23 converts digital signal VD to.Frame identification signal Fs directly delivers to CPU 24.Line synchronizing signal Hs directly send CPU 24, send CPU24 through the clock signal C K that pll clock generator 25 produces and Hs is phase-locked simultaneously.The task of CPU has three: the first, from the brightness data Y of input, extract image feature data VT; The second, AT and VT are stacked up constitutes the imaging characteristic data HED that makes a start in certain sequence; The 3rd, produce various work waves, they comprise sampling window signal SW that sends to A/D converter 23 and the Data Labels burst signal BU that represents characteristic to multiplier 27 transmissions.For make CPU frame by frame, the row the order operate as normal, also need import Hs, Fs and with the phase-locked signals such as clock CK of Hs.Memory 26 mainly is for the CPU storage and provides original or intermediate data.Multiplier 27 realizes making a start imaging characteristic data sequence HED to the modulation of data index pulse string signal BU, and promptly its output signal HEDB has pulse train when HED is 1, and HED is 0 o'clock then no pulse string.HEDB and CVBS together are input to stack in addition (embedding) device 3, when the CVBS of input cannot not be subsidiary the general vision signal of imaging characteristic data, addition (embedding) device 3 can be realized the stack of two signals with adder, CVBS as input is when having attached the vision signal of imaging characteristic data (for example relaying), then addition (embedding) device 3 must be a phase embedding device, it will attach the imaging characteristic data truncation originally, and replace with current imaging characteristic data.The imaging characteristic data sequence HED that the composite video signal CVBS of addition (embedding) device 3 outputs is carrying self together is sent to the broadcast of television channel modulate emission passage.
The subsystem of making a start is mainly finished the extraction of imaging characteristic data sequence, stack and transmission, and is wherein important with the extraction of acoustic image data sequence especially, specifies below.
The extraction of imaging characteristic data sequence is divided into the extraction of sound characteristic data and the extraction of image feature data.
The image feature data sequence is made of jointly image line difference characteristic, image Frame difference characteristic and image column difference characteristic.The present invention extracts the image feature data sequence by emitter follower, low pass and sync separator, single-chip microcomputer from TV signal image sequence self, by analysis, judge whether TV signal is under attack in transmission course to this characteristic sequence.
Introduce the extracting method of image line difference characteristic, the extracting method of image Frame difference characteristic and the extracting method of image column difference characteristic below respectively.Can or select separately to use according to concrete needs combination in actual applications.
Extracting method for image line difference characteristic is: sampling window signal SW extracts M * N the pixel (M that horizontal direction is an every group sampling point from every frame picture, they can be on same scan line, also can respectively be dispersed on some scan lines, be total to the N group on the vertical direction), Y-signal to every pixel carries out the n bit quantization, CPU adds up to every group M sample value, and compare with the accumulated value of previous sampling group, if reaching suitable threshold, their difference counts 1, otherwise count 0, so just constituted image line difference characteristic, every frame has the capable difference characteristic of N bit.
Extracting method for image Frame difference characteristic is: the summation of asking N sampling group accumulated value, compare with preceding frame summation, count 1 if their difference reaches suitable threshold, otherwise count 0, so just constituted the frame difference characteristic of image, every frame has 1bit frame difference characteristic.
Extracting method for image column difference characteristic is: N sample value of every row added up, compare mutually with the accumulated value of previous sampling row, if reaching suitable threshold, their difference counts 1, otherwise count 0, so just constituted the row difference characteristic of image, every frame has Mbit row difference characteristic.
Three category feature data can be used also capable of being combined making separately, the image feature data of total (1+M+N) bit of every frame when making up entirely.Just can carry out after the extraction of difference characteristic must be adopted the brightness data of complete frame owing to be listed as, the memory 6 in make a start subsystem and the receiving end subsystem is prepared for this reason, and as not using row difference feature, memory 6 can omit.These characteristics are arranged according to a certain order and have then been formed the image feature data sequence.The value view image sharpness grade of M, N and accuracy of identification and decide, for radio and television, M can choose in 30 to 70 scope, and N then can choose in 25 to 60 scope.Quantified precision n generally gets the 4-6 bit.
When picture signal is attacked in transmission course, no matter be change picture signal itself or illegal literal of interpolation or mark, at this moment the image feature value of signal must change, different with the characteristic value of original image, the present invention makes full use of these characteristics of image feature value, judge whether TV signal is under attack in transmission, thereby realize reporting to the police automatically, so that in time take corresponding measure.
The extraction of sound characteristic data AT can be adopted multiple scheme, and the present invention proposes two kinds of foolproof feature extraction schemes, can be widely used in sound truth identification field.
Scheme 1:
Adopt delay amplitude difference feature extraction method as shown in Figure 3.This method is that the voice signal AUDIO that will import is input in detection/integrator 11, after detection/integrator 11 is handled, exports time dependent range signal; This range signal is divided into two-way, and one the tunnel directly send comparison quantizer 14, is input to behind delayed circuit 12 in another road and the amplifying circuit 13 again and send comparison quantizer 14.The effect of delay circuit 12 is to make the signal delay regular hour, and 50-200ns for example, 13 of amplifying circuits are used for the amplitude fading that compensating delay circuit 12 causes.The relatively instant range signal that will import of quantizer 14 and the delay range signal amplification of making comparisons, and amplitude difference carried out analog to digital conversion; It is output as sound characteristic data AT.If the sound difference of input, the Changing Pattern of AT are just different, that is to say the sound characteristic data (sequence) that different voice signals is corresponding different.If two audio signal characteristics data are identical, then show them from same sound, illustrate that they are not same sound otherwise characteristic is different.The characteristic value that requires according to accuracy of identification can be got the 1-3 bit.
Scheme 2:
Adopt spectrum amplitude difference feature extraction method as shown in Figure 4.This method is that the voice signal AUDIO that will import outputs to after emitter follower 15 is divided into the K road abreast in frequency division/detection/integrator 16; In frequency division/detection/integrator 16, every road voice signal is finished the frequency division of K passage through the identical band pass filter of the different relative bandwidth of a centre frequency; Every passage becomes K road range signal to output in the comparison quantizer 17 after remaking detection and integration; Relatively be provided with K-1 road level ratio than quantizer in the quantizer 17, to the output of the K road of frequency division/detection/integrator 16 successively relatively and carry out 1 bit quantization, quantizing rule is such as being: I road amplitude is bigger than (I-1) road amplitude, then be output as 1 (high level), otherwise export 0 (low level), relatively that quantizer 17 outputs is the sound characteristic data AT of (K-1) bit.Different voice signals has different spectral characteristics, thereby can discern different sound according to AT.The maximum occurrences of K needn't be greater than 5, and promptly the AT maximum is got 4 bits is enough to.The minimum value of K is 2, and this moment, AT was 1 bit, also can discern alternative sounds effectively.
Imaging characteristic data sequence HED after the extraction together is sent to the broadcast of television channel modulate emission passage by adder or phase embedding device 3 with composite video signal CVBS stack back and is sent through the TV modulation transmitter.
The process of transmitting of imaging characteristic data sequence is: earlier imaging characteristic data sequence HED is mapped to digital waveform by certain rule; Then digital waveform is converted to the analog waveform of representative image characteristic sequence, again analog waveform is superimposed upon the horizontal blanking back porch colour burst head flat region afterwards of composite video signal CVBS; At last, the composite video signal CVBS that is loaded with imaging characteristic data sequence impulse waveform is sent by the associated television passage.
Imaging characteristic data sequence HED is to be the digital signal of clock with the line frequency.1,0 of imaging characteristic data are represented so that the level of HED is high and low.The rule that imaging characteristic data sequence HED is mapped to digital waveform can adopt multiple scheme to determine flexibly.For example: after obtaining image line difference characteristic value, selection a certain or some row full line is thereafter put height or is put to hang down and represent; After the value that obtains picture frame difference characteristic, can select thereafter a certain or some row full line to put height or put to hang down and represent equally; And M image column difference characteristic needs to shine upon these numerical value respectively with the row of some regulation of next frame, and wherein the row of the capable difference feature of frame interts mutually under some guild and the mapping.Certain row or some row are represented in the then optional field flyback of sound characteristic data AT.Also all imaging characteristic data of certain frame all can be stored in addition, be mapped as regulation row high-low level by certain rule to next frame.In addition, a frame has 625 row, can transmit the data of 625 bits altogether.In order to the remaining bits after the transmission imaging characteristic data, also can be used to transmit other data or be used as encryption.
Data Labels burst signal BU also is the periodic signal that repeats with line frequency, be no more than after the starting point of being expert in the scope of 9 to 10.5 μ s and be ± burst signal of 0.15V, this scope just in time is in the zone of the flat region after the colour burst head of vision signal horizontal blanking back porch, and shape of pulse (sinusoidal to square wave) and pulse number there is no strict demand.All the other periods are 0 entirely.
Fig. 5 is a receiving end subsystem theory diagram of the present invention.As shown in the figure, after receiving end receives TV signal, recover transmission imaging characteristic data sequence according to the impulse waveform that is attached on the CVBS on the one hand, receive the imaging characteristic data sequence by the Rule Extraction of making a start identical simultaneously from the sound that receives and image stream, both compare is whether the decidable TV signal is replaced or distort in transmission course.
In receiving end, in unit 42,52,53,54,55,56 among Fig. 5 and the subsystem of making a start shown in Figure 2 counterpart almost completely identical all are abstraction functions of finishing sound and image feature data sequence, just no longer include Data Labels pulse train BU in the output of microprocessor (CPU) 54, and replace with pulse train window BW.The AUDIO signal of high intermediate frequency video reception unit 41 outputs send sound characteristic extraction unit 42 among Fig. 5; And the CVBS signal of output is divided into 3 the tunnel: the one tunnel concurrently and is sent low pass and sync separator 52; All the other two-way all are sent to relatively amplification/gate 61, but wherein one the road have passed through low pass filter 51 earlier.Relatively the effect of amplification/gate 61 is the low-frequency components that remove among the CVBS, only the radio-frequency component that comprises the beautiful pulse train of data is amplified, and under the effect of pulse train window BW, recover the analog waveform HEDB of representative emission imaging characteristic data sequence.Data interpretation unit 62 further reverts to HEDB the digital waveform HED of representative emission imaging characteristic data sequence.By the digital waveform LOD of microprocessor 54 by the imaging characteristic data sequence that receives with the identical Rule Extraction representative of making a start, and together be input to comparison decision device 7 with HED after recovering, compare, judge whether both are identical by comparing decision device 7,, then send alarm signal if different.
High intermediate frequency video reception unit 41 in the receiving end subsystem is identical with general television receiver substantially, and it is set to the automatic channel search state the present invention.After promptly searching out a channel and finishing respective handling, send safety or alarm signal, the search of beginning succeeding channel, and ceaselessly circulation.
The extracting method of receiving end imaging characteristic sequence is identical with the extracting method of the imaging characteristic sequence of making a start, and receiving end self is extracted the imaging characteristic data sequence according to the rule and the algorithm of the subsystem of making a start from the picture signal stream that receives.
The restoration methods of receiving end imaging characteristic sequence is: take out the analog waveform HEDB that represents the imaging characteristic data sequence HED that makes a start from the CVBS signal that receives; With a decipherer analog waveform is reverted to the digital waveform that representative sends the imaging characteristic data sequence.
Fig. 6 is data interpretation unit theory diagram in the receiving end subsystem of the present invention.As shown in the figure, analog waveform HEDB exports the waveform shown in DL among Fig. 7 through amplifier 621, detection integrator 622.The starting point of DL rising edge just in time faces toward the starting point of each pulse train among the HEDB.The delayed device 624 of Hs suitably postpones to read clock DK as data, and the size adjustment of delay faces toward the high level of DL to the rising edge of DK.DL and DK together deliver in the latch 623, and its output is the corresponding digital waveform HED with HEDB.
The comparison and the judgement of receiving end imaging characteristic value: the similarities and differences of the imaging characteristic data sequence HED of the transmission of making a start that imaging characteristic data sequence LOD that receiving element extracts and recovery unit recover promptly are the foundations of TV signal content safety monitoring.If two characteristic sequences are identical, show that the acoustic image that receives is identical with the acoustic image that sends of making a start, the signal transmission is safe; If in the transmission course, the CVBS that carries the imaging characteristic data sequence is illegally replaced by common CVBS, then the transmission imaging characteristic data sequence HED of receiving end recovery is 0 entirely, and the characteristic sequence LOD of the reception acoustic image that extracts can not be 0 entirely, two sequence differences, promptly decidable has transferred out problem; If in the transmission course, synchronizing signal is retained, only the picture signal part is replaced, because the transmission imaging characteristic data sequence HED that receiving end recovers is extracted by the emission acoustic image, and it is different with original acoustic image to receive acoustic image, the reception imaging characteristic data sequence LOD that extracts is inevitable different with HED, and promptly decidable has transferred out problem; If in the transmission course, image is applied illegal literal or mark, for example horizontal captions, then some row difference characteristic can obviously not be inconsistent with the row difference characteristic that sends image in the reception image feature data sequence of Ti Quing, if stack is vertical literal or mark, then some row difference characteristic can obviously not be inconsistent with the row difference characteristic that sends image in the reception image feature data sequence of Ti Quing, so the decidable transmission is out of joint; If in the transmission course, voice signal is distorted, and the AT data of LOD and HED are different so, and promptly decidable has transferred out problem.
Fig. 7 is in the TV signal content delivery safety monitoring system of the present invention, and the oscillogram of relevant signal and these signals be mutual time relationship figure to each other.
The technical scheme that the present invention sets forth also can be used for digital television system.Because TV signal is digitized, uses rule described above, can extract the characteristic of sound and image more easily, puts into TS stream as additional data after these data are done to maintain secrecy and processed and transmit together.Receiving end by the imaging characteristic data of the Rule Extraction receiving end of making a start same, can solve the imaging characteristic data of making a start simultaneously from the additional data that receives from the sound that receives, view data, relatively both, the true and false that can decision signal.
Because the present invention adopts technique scheme, so to the safety monitoring of TV signal content delivery the time, have Following outstanding advantage: 1, since the present invention's monitoring to as if the imaging characteristic data sequence, it and sending and receiving The acoustic image content is directly related, so no matter how the lawless person destroys television content: at original television content base On the plinth additional content or distort in perhaps increase interfering signal, all can exert an influence to the imaging characteristic data sequence, Stay the foundation of being tracked down, not only can monitor out CVBS, the AUDIO signal is replaced, only can also monitor out Replace picture signal and keep the situation of synchronizing signal, even connect the illegal modifications partial picture or add literal can both be real In time, check out, so judged result of the present invention accurately, reliably has unrivaled anti-counter the detecing of other scheme Broken ability. 2, the imaging characteristic of the present invention's monitoring is many, and monitoring periods is short, thereby is swift in response. 3, the present invention Simple, reliable in order to the technical scheme that realizes goal of the invention, the mapping relations between from the imaging characteristic to the digital waveform Versatile and flexible, also can further carry out coding encrypting, high safety to it. 4, imaging characteristic data order of the present invention Row together transmit with the CVBS signal, transmission channel had no special requirements, therefore, relevant construction cost and fortune Working cost is cheap.
Claims (15)
1, a kind of TV signal content delivery safety monitoring system, it is characterized in that: it comprises make a start subsystem and receiving end subsystem;
The described subsystem of making a start comprises that extraction unit, the image feature data sequence of sound characteristic data sequence are extracted and acoustic image characteristic sequence forms unit, the stack of imaging characteristic data sequence and transmitting element; The subsystem of making a start is mainly finished the stack and the sending function of the extraction of imaging characteristic data sequence, imaging characteristic data sequence and vision signal;
Described receiving end subsystem comprises reception sound characteristic data sequence extraction unit, receives the extraction of image feature data sequence and receives imaging characteristic data sequence formation unit, transmission imaging characteristic data sequence recovery unit and this two sequence comparisons, judging unit; The receiving end subsystem mainly finishes received television signal, extract sound in the TV signal and image slices characteristic sequence and it is formed imaging characteristic data sequence, recovers these two data sequences of imaging characteristic data sequence, comparison and judgement of making a start and sending.
2, a kind of TV signal content delivery safety monitoring method, it may further comprise the steps:
Step 1: extract: the subsystem of making a start self extracts the imaging characteristic data sequence from sound and picture signal stream;
Step 2: send: the subsystem of making a start is attached to the characteristic sequence on the composite video signal in the mode of dedicated pulse shape and together sends with picture signal;
Step 3: receive: receiving end subsystem received television signal;
Step 4: extract: the receiving end subsystem from the sound that receives and image stream by the Rule Extraction imaging characteristic data sequence of making a start identical;
Step 5: recover: the receiving end subsystem recovers the imaging characteristic data sequence of making a start and sending according to the impulse waveform that is attached on the CVBS;
Step 6: relatively and judge: the receiving end subsystem relatively and judge the imaging characteristic data sequence of extracting and recovering, whether judgement/discriminating TV signal replaced or distorted in transmission course.
3, a kind of TV signal content delivery safety monitoring method according to claim 2, it is characterized in that: imaging characteristic data sequence extraction step in described make a start subsystem and the receiving end subsystem comprises that the sound characteristic data sequence is extracted and the image feature data sequence is extracted.
4, a kind of TV signal content delivery safety monitoring method according to claim 3, it is characterized in that: the extracting method of described image feature data sequence comprises: the extraction of the extraction of image line difference characteristic or picture frame difference characteristic or image column difference characteristic are extracted, and the extraction of three kinds of image feature datas can be used alone or in combination as required.
5, a kind of TV signal content delivery safety monitoring method according to claim 4, it is characterized in that: the extracting method of described image line difference characteristic is: every frame picture is got M * N pixel, signal to every pixel carries out the n bit quantization, every capable M sample value is added up, with absolute value previous sampling row and that relatively must differ from mutually; Absolute value to difference is made 1 bit quantization, the capable difference characteristic of composing images.
6, a kind of TV signal content delivery safety monitoring method according to claim 4, it is characterized in that: the extracting method of described picture frame difference characteristic is: ask the summation of N sampling row accumulated value, compare with preceding frame summation the absolute value of difference; Absolute value to difference is made 1 bit quantization, pie graph picture frame difference characteristic.
7, a kind of TV signal content delivery safety monitoring method according to claim 4, it is characterized in that: the extracting method of described image column difference characteristic is: N sample value of every row added up, with absolute value previous sampling row and that relatively must differ from mutually; Absolute value to difference is made 1 bit quantization, composing images row difference characteristic.
8, a kind of TV signal content delivery safety monitoring system according to claim 3, it is characterized in that: the extracting method of described sound characteristic data is: postpone amplitude difference feature extraction method; This method is that the voice signal that will import is input in detection/integrator, after detection/integrator is handled, exports time dependent range signal; This range signal is divided into two-way, and one the tunnel directly send the comparison quantizer, is input to behind delayed circuit in another road and the amplifying circuit again and send the comparison quantizer; The relatively instant range signal that will import of quantizer and the delay range signal amplification of making comparisons, and amplitude difference carried out analog to digital conversion; It is output as the sound characteristic data.
9, a kind of TV signal content delivery safety monitoring system according to claim 3, it is characterized in that: the extracting method of described sound characteristic data is: spectrum amplitude difference feature extraction method; This method is that the voice signal that will import outputs in frequency division/detection/integrator after emitter follower is divided into the K road abreast; In frequency division/detection/integrator, every road voice signal is finished the frequency division of K passage through the identical band pass filter of the different relative bandwidth of a centre frequency; Every passage becomes K road range signal to output in the comparison quantizer after remaking detection and integration; Relatively be provided with K-1 road level ratio than quantizer in the quantizer, successively relatively and carry out 1 bit quantization to the K road output of frequency division/detection/integrator; Relatively quantizer output is the sound characteristic data of (K-1) bit.
10, a kind of TV signal content delivery safety monitoring method according to claim 2, it is characterized in that: the sending method of described imaging characteristic data is: all kinds of characteristics are arranged the constitutive characteristic data sequence according to a certain order; The characteristic sequence is mapped to digital waveform by certain rule; The analog waveform of representative image characteristic sequence will be converted to; Waveform is superimposed upon the horizontal blanking back porch colour burst head flat region afterwards of composite video signal; The composite video signal that is loaded with image feature data train pulse waveform is sent by the associated television passage.
11, a kind of TV signal content delivery safety monitoring method according to claim 10, it is characterized in that: the mapping relations between described imaging characteristic data and the digital waveform are: after obtaining image line difference characteristic value, select thereafter a certain or some row full line to put height or put to hang down and represent or after the value that obtains picture frame difference characteristic, same selection a certain or some row full line is thereafter put height or is put to hang down and represent, and when M image column difference characteristic, need to shine upon these numerical value respectively with the row of some regulation of next frame, wherein some guild and mapping down the row of the capable difference feature of frame intert mutually or all kinds of image feature datas of certain frame all stored, be mapped as regulation row high-low level to next frame by certain rule.
12, a kind of TV signal content delivery safety monitoring method according to claim 2, it is characterized in that: the extracting method of described receiving end subsystem imaging characteristic sequence is: the receiving end subsystem extracts the digital waveform that representative receives the imaging characteristic data sequence by the identical rule of making a start from the picture signal that receives from the sound that receives and image stream.
13, a kind of TV signal content delivery safety monitoring method according to claim 2, it is characterized in that: the restoration methods of described receiving end imaging characteristic sequence is: take out the analog waveform of representing the imaging characteristic data sequence HED that makes a start from the CVBS signal that receives; With a decipherer analog waveform is reverted to the digital waveform that representative sends the imaging characteristic data sequence.
14, a kind of TV signal content delivery safety monitoring method according to claim 2, it is characterized in that: described receiving end subsystem comparison and judge to extract and the method for the imaging characteristic data sequence recovered is: the make a start digital waveform of imaging characteristic data sequence of the representative that the representative that receiving end is extracted receives the digital waveform of imaging characteristic data sequence and recovery compares, thereby enters a judgement.
15, a kind of TV signal content delivery safety monitoring system according to claim 1, it is characterized in that: the receiving element that is used for received television signal in the described receiving end subsystem is high, video reception part, it is identical with general television receiver, and it works in the automatic channel search state; After searching out a channel and finishing respective handling, send safety or alarm signal, the search of beginning succeeding channel, and ceaselessly circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021592349A CN1512690A (en) | 2002-12-27 | 2002-12-27 | TV signal content transmission safety monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021592349A CN1512690A (en) | 2002-12-27 | 2002-12-27 | TV signal content transmission safety monitoring system |
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| CN1512690A true CN1512690A (en) | 2004-07-14 |
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| CNA021592349A Pending CN1512690A (en) | 2002-12-27 | 2002-12-27 | TV signal content transmission safety monitoring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014075434A1 (en) * | 2012-11-15 | 2014-05-22 | 浙江大华技术股份有限公司 | Method and apparatus for sending and receiving audio data |
| CN104935978A (en) * | 2015-06-29 | 2015-09-23 | 湖南双菱电子科技有限公司 | Cloud-based television coverage detection, analysis and counting system and device |
| CN110858865A (en) * | 2018-08-24 | 2020-03-03 | 上海富瀚微电子股份有限公司 | Data transmission method and device for simulating high-definition video |
| CN116156217A (en) * | 2022-12-16 | 2023-05-23 | 杭州当虹科技股份有限公司 | Method for carrying out consistency verification on video content based on intelligent identification |
-
2002
- 2002-12-27 CN CNA021592349A patent/CN1512690A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014075434A1 (en) * | 2012-11-15 | 2014-05-22 | 浙江大华技术股份有限公司 | Method and apparatus for sending and receiving audio data |
| US9531980B2 (en) | 2012-11-15 | 2016-12-27 | Zhejiang Dahua Technology Co., Ltd. | Method and apparatus for sending and receiving audio data |
| CN104935978A (en) * | 2015-06-29 | 2015-09-23 | 湖南双菱电子科技有限公司 | Cloud-based television coverage detection, analysis and counting system and device |
| CN110858865A (en) * | 2018-08-24 | 2020-03-03 | 上海富瀚微电子股份有限公司 | Data transmission method and device for simulating high-definition video |
| CN116156217A (en) * | 2022-12-16 | 2023-05-23 | 杭州当虹科技股份有限公司 | Method for carrying out consistency verification on video content based on intelligent identification |
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