CN102724459B - Analog video signal format determination system and method and related devices - Google Patents
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Abstract
The invention discloses an analog video signal format determination system and method and related devices, which are used for simplifying the matching process of analog video signal format types and improving the compatibility of a receiving device. The analog video signal format determination system comprises a video signal acquisition device and a plurality of video signal receiving devices, wherein each video signal receiving device is used for generating carrier signals with scheduled frequency when having a high-definition analog video signal decoding capacity, and each video signal receiving device is also used for outputting the carrier signals with the scheduled frequency to the video signal acquisition device; and the video signal acquisition device is used for determining whether to receive the carrier signals with the scheduled frequency sent by the video signal receiving devices; and the video signal acquisition device is also used for determining whether the video signal receiving devices support the high-definition analog video signal format when receiving the carrier signals with the scheduled frequency sent by the video signal receiving devices, otherwise, the video signal acquisition device determines that the video signal receiving devices do not support the high-definition analog video signal format.
Description
Technical field
The present invention relates to technical field of video monitoring, relate in particular to a kind of analog video signal form and determine system, method and relevant device.
Background technology
In technical field of video monitoring, video monitoring system generally includes the video signal collection apparatus of front end and the video signal receiving apparatus of rear end.Video signal collection apparatus collects after vision signal, after coding and compression etc. are processed, by video signal transmission, to video signal receiving apparatus, video signal receiving apparatus is to showing after the decoding video signal receiving and decompression.
Wherein, video signal receiving apparatus comprises DVR, network video coder, optical transmitter and receiver etc., for traditional CVBS analog video signal, the video modulus conversion chip that these equipment adopt can be judged according to the chrominance subcarrier frequency in the video analog signal receiving the form of analog video signal, thereby can realize the analog video signal form that automatic detection receives, and the corresponding decoding process of Auto-matching.
Popularization along with 1280H and above high definition analog video technology, because the transmission technology of this class high definition analog video signal and the transmission technology feature of CVBS analog video signal in the past exist obvious difference, be that video signal collection apparatus or video signal receiving apparatus all need the analog video signal of two kinds of Format Types (SD form and high-definition format) to carry out adaptation.But, existing video signal collecting device (for example, analog video camera) the transmission chip of end is owing to cannot obtaining the video signal format type of receiving equipment support, thereby, cannot learn whether receiving equipment supports 1280H high definition analog video signal form, if the analog video signal that video signal collection apparatus is used the transmission of 1280H high definition analog video signal form to collect, and the receiving equipment of rear end is not supported high definition analog video signal decoding technique, there will be without abnormal conditions such as image, Hua Ping.
In order to address the above problem, in prior art, conventionally adopt artificial matching way, analog video signal Format Type to the video signal collection apparatus transmission of front end mates, this process is complicated operation not only, meanwhile, has also reduced the compatibility of video signal receiving apparatus.
Summary of the invention
The embodiment of the present invention provides a kind of analog video signal form to determine system, method and relevant device, in order to simplify the matching process of analog video signal Format Type, improves the compatibility of receiving equipment.
The embodiment of the present invention provides a kind of analog video signal form to determine system, comprises video signal collection apparatus and a plurality of video signal receiving apparatus, wherein:
Described video signal receiving apparatus, when possessing high definition analog video signal decoding capability at self, generates the carrier signal of preset frequency, and the carrier signal of described preset frequency is sent to described video signal collection apparatus;
Described video signal collection apparatus, for when receiving the carrier signal of the preset frequency that described video signal receiving apparatus sends, determines that described video signal receiving apparatus supports high definition analog video signal form; Otherwise, determine that described video signal receiving apparatus do not support high definition analog video signal form.
The embodiment of the present invention provides a kind of video signal receiving apparatus, comprising:
Signal generator, for generating the carrier signal of preset frequency, and exports the carrier signal of described preset frequency to video signal collection apparatus.
The embodiment of the present invention provides a kind of video signal collection apparatus, comprising:
Band pass filter, for extracting the carrier signal of the preset frequency of video signal receiving apparatus transmission;
Frequency discriminator block, for judging whether described band pass filter extracts the carrier signal of preset frequency, judgment result is that while being, determine described video signal receiving apparatus support high definition analog video signal form, when the determination result is NO, determine that described video signal receiving apparatus do not support high definition analog video signal form.
The embodiment of the present invention provides a kind of analog video signal form to determine method, by the video signal receiving apparatus that possesses high definition analog video signal decoding capability, sends the carrier signal of preset frequency to video signal collection apparatus; And described method, comprising:
Video signal collection apparatus determines whether the carrier signal of the preset frequency that receives video signal receiving apparatus transmission; And
When receiving the carrier signal of the preset frequency that video signal receiving apparatus sends, determine that this video signal receiving apparatus supports high definition analog video signal form; In the carrier signal that does not receive the preset frequency that video signal receiving apparatus sends, determine that this video signal receiving apparatus do not support high definition analog video signal form.
The analog video signal form that the embodiment of the present invention provides is determined system, method and relevant device, when video signal receiving apparatus possesses high definition analog video signal decoding capability, generate the carrier signal of preset frequency, and the carrier signal of described preset frequency is sent to described video signal collection apparatus, owing to not possessing the video signal receiving apparatus of high definition analog video signal decoding capability and cannot generate and send the carrier signal of this preset frequency, thereby, the carrier signal that makes video signal collection apparatus self whether receive preset frequency by judging can judge whether video signal receiving apparatus supports high definition analog video signal form, whole process is without artificial participation, therefore, simplified the process that analog video signal Format Type is mated, improved the compatibility of video signal receiving apparatus.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in the specification write, claims and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is in the embodiment of the present invention, SD analog video signal and high definition analog video signal bandwidth occupancy schematic diagram;
Fig. 2 is in the embodiment of the present invention, and analog video signal form is determined the structural representation of system;
Fig. 3 is in the embodiment of the present invention, the structural representation of video signal receiving apparatus;
Fig. 4 is in the embodiment of the present invention, the structural representation of video signal collection apparatus;
Fig. 5 is in the embodiment of the present invention, the syndeton schematic diagram between video signal collection apparatus 201 and video signal receiving apparatus 202;
Fig. 6 is in the embodiment of the present invention, and analog video signal form is determined the implementing procedure schematic diagram of method.
Embodiment
In order to simplify the matching process of analog video signal Format Type, improve the compatibility of receiving equipment, the embodiment of the present invention provides a kind of analog video signal form to determine system, method and relevant device.
Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein is only for description and interpretation the present invention, be not intended to limit the present invention, and in the situation that not conflicting, embodiment and the feature in embodiment in the present invention can combine mutually.
Embodiment mono-
The characteristic on frequency domain according to SD analog video signal and high definition analog video signal, adopt the method that detects higher frequency signals, whether the video signal receiving apparatus that can judge rear end supports high definition analog video signal, and according to judged result, selects the form of output analog video signal.The frequency domain scope of SD analog video signal is 0 ~ 6MHz, and the frequency range of high definition analog video signal is 0 ~ 20MHz, therefore, can select a frequency values f
cmuch larger than the carrier signal of 20MHZ, not affecting under the prerequisite of SD analog video signal or the transmission of high definition analog video signal, as the carrier frequency value detecting, wherein, f
cspan can be F>=N+1, wherein, F represents preset frequency, N represents analog video signal upper limiting frequency.Preferably, f
cspan can be 20MHZ ~ 50MHz, or can be for more than 50MHz, for convenience of description, in the embodiment of the present invention with f
c=36MHz is that example describes.
As shown in Figure 1, be SD analog video signal and high definition analog video signal bandwidth occupancy schematic diagram, in Fig. 1, the bandwidth of SD analog video signal is 6MHz, and high definition analog video signal comprises luminance and chrominance information, and its total bandwidth is 20MHz.Transmission and reception for analog signal, SD analog video signal adopts the low pass filter of 6MHz, high definition analog video signal adopts the low pass filter of 20MHz, it should be noted that, Figure 1 shows that resolution is 720p(25 frame, 30 frames) in situation, high definition analog video signal bandwidth occupancy schematic diagram, it is only for explanation of the invention, and is not used in limitation of the invention.The present invention for detection of carrier signal frequency f
cmuch larger than 20MHz, therefore can not affect the transmission quality of analog video signal.
Based on above-mentioned analysis, as shown in Figure 2, the analog video signal form providing for the embodiment of the present invention is determined the structural representation of system, comprising: video signal collection apparatus 201 and at least one video signal receiving apparatus 202, wherein:
Each video signal receiving apparatus 202, when possessing high definition analog video signal decoding capability at self, generates the carrier signal of preset frequency, and to the carrier signal of video signal collection apparatus 201 output preset frequencies;
In concrete enforcement, each video signal receiving apparatus 202 is when self possessing high definition analog video signal decoding capability, can to video signal collection apparatus 201, export according to predetermined period the carrier signal of described preset frequency, can certainly continuation to video signal collection apparatus 201, export the carrier signal of preset frequencies.
Video signal collection apparatus 201, for judging the carrier signal of the preset frequency that self whether receives video signal receiving apparatus 202 transmissions; And when receiving the carrier signal of the preset frequency that video signal receiving apparatus 202 sends, determine that this video signal receiving apparatus 202 supports high definition analog video signal forms; Otherwise, determine that video signal receiving apparatus 202 do not support high definition analog video signal form.
During concrete enforcement, for example, when video signal receiving apparatus 202 possesses high definition analog video signal decoding capability (can be 1280H high definition analog video signal receiving equipment), can by a preset frequency, be f according to predetermined period
ccarrier signal send to the video signal collection apparatus of opposite end, video signal collection apparatus 201 can be f by a center frequency point
cband pass filter this carrier signal is leached, and lock the carrier signal of this preset frequency, like this, once judge that the carrier signal of this preset frequency exists, can judge the video signal receiving apparatus 202 support high definition analog video signal forms of opposite end, thereby when to this video signal receiving apparatus output analog video signal, can adopt the output of high definition analog video signal.Owing to not supporting the video signal receiving apparatus 202 of high definition analog video signal cannot send the carrier signal of this reverse preset frequency, video signal collection apparatus 201 cannot get the carrier signal of this preset frequency, thereby the video signal receiving apparatus that can judge opposite end is not supported high definition analog video signal form, therefore, in output, collect analog video signal time, will adopt SD analog video signal output.When if the rear end of video signal collection apparatus 201 does not have video signal receiving apparatus 202, video signal collection apparatus 201 cannot get the carrier signal of this preset frequency equally, thereby also will adopt the output of SD analog video signal.Simultaneously, owing to possessing the raise the price video signal receiving apparatus of ability of high definition analog video signal, need to video signal collection apparatus, send according to predetermined period the carrier signal of this preset frequency, when this video signal receiving apparatus is changed or is safeguarded, video signal collection apparatus can judge whether the video signal receiving apparatus of front end supports high definition analog video signal form immediately, and according to result of determination, selects the analog video signal output of suitable format.
Embodiment bis-
During concrete enforcement, for example, for example, because high-definition video signal comprises the high-definition video signal (high-definition video signal that rate is 720P respectively) of high-resolution high-definition video signal (high-definition video signal that rate is 1080P respectively) and low resolution, if video signal receiving apparatus is supported high-resolution high-definition video signal, high-definition video signal to its output high-resolution or low resolution all can, but, when if video signal receiving apparatus is supported the high-definition video signal of low resolution, to it, export high-resolution high-definition video signal, will cause video signal receiving apparatus to decode and cause demonstration to make mistakes.
Based on this, in the embodiment of the present invention, preset frequency can be, but not limited to comprise the first preset frequency and the second preset frequency, and wherein, the first preset frequency is higher than the second preset frequency.For example, when if video signal receiving apparatus is supported 1080p high-definition video signal, the carrier signal that can be 45M to video signal collection apparatus output frequency, and when video signal receiving apparatus is supported 720p high-definition video signal, can export to video signal collection apparatus the carrier signal of 36M.After video signal collection apparatus receives the carrier signal of the preset frequency that video signal receiving apparatus sends, can further determine the frequency of this carrier signal, determine when this carrier signal is the first preset frequency, to video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal; If determine when this carrier signal is the second preset frequency, to video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
In embodiment bis-, the vision signal that the high definition analog video signal of take comprises Resolutions is illustrated as example, but, during concrete enforcement, high definition analog video signal can comprise multiple, correspondingly, predetermined frequency signal also can comprise multiple, when judgement video signal receiving apparatus is supported the high-definition video signal of which kind of resolution, the principle that only need to provide according to the embodiment of the present invention is judged, by video reception apparatus periodically or continue the carrier signal to preset frequency, the preset frequency of this carrier signal is higher than analog video signal upper limiting frequency, and remain with at least space of 1M with this analog video signal upper limiting frequency.
It should be noted that, during concrete enforcement, embodiment bis-judges that video signal receiving apparatus supports that the high-definition video signal of which kind of resolution can be prior to judging in embodiment mono-whether video signal receiving apparatus supports high-definition video signal to carry out, this be because, no matter judge video signal receiving apparatus and support the high-definition video signal of which kind of resolution, all can judge video signal receiving apparatus support high-definition video signal.
For convenience of description, during follow-up describing, all to judge whether video signal receiving apparatus supports high-definition video signal to support the high-definition video signal of which kind of resolution to be implemented as example prior to judgement video signal receiving apparatus.
The analog video signal form that the embodiment of the present invention provides is determined system, the video signal receiving apparatus that possesses high definition analog video signal decoding capability sends the carrier signal of preset frequency to video signal collection apparatus, whether video signal collection apparatus is existed by detecting the carrier signal of this preset frequency, just can judge whether video signal receiving apparatus supports high definition analog video signal, if, export high definition analog video signal, otherwise, output SD analog video signal, reach the object of Auto-matching analog video signal output format, thereby greatly improve the compatibility of system, remove manually-operated inconvenience from.
Embodiment tri-
As shown in Figure 3, the structural representation of the video signal receiving apparatus providing for the embodiment of the present invention, comprising:
During concrete enforcement, between video signal receiving apparatus 202 and video signal collection apparatus 201, by transmission cable, connect, signal generator 2021 is exported to video signal collection apparatus 201 by carrier signal that generate, preset frequency by the transmission cable between the two.
During concrete enforcement, video signal receiving apparatus 202 can also comprise low pass filter 2022 and analog video signal receiver module 2023, wherein, high definition analog video signal or SD analog video signal that low pass filter 2022 can send for extracting video signal collection apparatus, analog video signal receiver module 2023 can carry out the processing such as demodulation for high definition analog video signal or the SD analog video signal that low pass filter 2022 is extracted.Preferably, if when this video signal receiving apparatus 202 is supported high definition analog video signal, low pass filter 2022 can be 20MHz low pass filter.
It should be noted that, while specifically implementing, the analog video signal receiver module 2023 of video signal receiving apparatus protection, signal generator 2021 and low pass filter 2022 can use independently chip circuit to realize, and also can in same chips, realize.
Embodiment tetra-
As shown in Figure 4, the structural representation of the video signal collection apparatus providing for the embodiment of the present invention, comprising:
Concrete, the center frequency point of band pass filter 2011 is identical with preset frequency, thereby can from transmission cable, extract the carrier signal of preset frequency.
Concrete, when if band pass filter 2011 extracts the carrier signal of preset frequency, can be by the carrier signal of frequency discriminator block 2012 these preset frequencies of locking, and judge accordingly whether band pass filter has extracted the carrier signal of preset frequency, if determine the carrier signal of having extracted this preset frequency, the video signal receiving apparatus 202 that opposite end is described is supported high definition analog video signal form, if determine the carrier signal of not extracting this preset frequency, illustrate that the video signal receiving apparatus 202 of opposite end is not supported high definition analog video signal form.
During concrete enforcement, video signal collection apparatus 201, can also comprise:
Analog video signal sending module 2013, for according to the result of determination of frequency discriminator block 2012, when definite video signal receiving apparatus 202 is supported high definition analog video signal form, to video signal receiving apparatus 202 output high definition analog video signals; And definite video signal receiving apparatus 202 is not while supporting high definition analog video signal form, to video signal receiving apparatus 202 output SD analog video signals.
During concrete enforcement, preset frequency comprises the first preset frequency and the second preset frequency, and described the first preset frequency is higher than the second preset frequency; Preferably, in order further to determine video signal receiving apparatus, support the high-definition video signal of which kind of resolution, frequency discriminator block 2012, in the time of can also being the first preset frequency for definite preset frequency, determines video signal receiving apparatus support first kind analog video signal form; And definite preset frequency is while being the second preset frequency, determine that video signal receiving apparatus supports Equations of The Second Kind analog video signal form;
Analog video signal sending module 2013, in the time of can also determining that video signal receiving apparatus is supported first kind analog video signal form for frequency discriminator block 2012, to video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal; And while determining that for frequency discriminator block 2012 video signal receiving apparatus is supported Equations of The Second Kind analog video signal form, to video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
It should be noted that, while specifically implementing, the analog video signal sending module 2013 that video signal receiving apparatus 201 comprises, frequency discriminator block 2012 and band pass filter 2011 can use independently chip circuit to realize, and also can in same chips, realize.
Based on embodiment tri-and embodiment tetra-, as shown in Figure 5, for the syndeton schematic diagram between video signal collection apparatus 201 and video signal receiving apparatus 202, between the two, by transmission cable, connect, wherein, video signal collection apparatus 201 comprises analog video signal sending module 2013, band pass filter 2011 and frequency discriminator block 2012, video signal receiving apparatus 202 comprises signal generator 2021, low pass filter 2022 and analog video signal receiver module 2023, the concrete function of each module is identical with the function of each module in embodiment tri-and embodiment tetra-, here repeat no more.
Based on same inventive concept, in the embodiment of the present invention, also provide a kind of analog video signal form to determine method, because the principle that the method is dealt with problems determines that to analog video signal form system is similar, so the enforcement of the method can, referring to the enforcement of system, repeat part and repeat no more.
In concrete enforcement, when the video signal receiving apparatus of video signal collection apparatus opposite end possesses high definition analog video signal decoding capability, this video signal receiving apparatus is by the carrier signal of the output preset frequency to this video signal collection apparatus periodicity or continuation, when the video signal receiving apparatus of video signal collection apparatus opposite end does not possess high definition analog video signal decoding capability, to can not export to video signal collection apparatus the carrier signal of preset frequency, preferably, preset frequency can comprise the first preset frequency and the second preset frequency, wherein, the first preset frequency is higher than the second preset frequency, according to the frequency values of the preset frequency receiving of determining, can further determine video signal receiving apparatus and support which kind of high-frequency high definition analog video signal, based on this, the embodiment of the present invention provides a kind of analog video signal form to determine method, as shown in Figure 6, for analog video signal form is determined the implementing procedure schematic diagram of method, comprise the following steps:
S601, video signal collection apparatus judge the carrier signal of the preset frequency that self whether receives video signal receiving apparatus output, judgment result is that while being, and execution step S602, otherwise, execution step S603;
S602, determine that this video signal receiving apparatus supports high definition analog video signal form, and perform step S604;
S603, determine that this video signal receiving apparatus do not support high definition analog video signal form, and perform step S605;
S604, the preset frequency that receives of judgement are the first preset frequency or the second preset frequency, and while being defined as the first preset frequency, execution step S606, while being defined as the second preset frequency, performs step S607;
S605, to this video signal receiving apparatus output SD analog video signal, flow process finishes;
S606, to this video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal;
S607, to this video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
The analog video signal form that the embodiment of the present invention provides is determined system, method and relevant device, when video signal receiving apparatus possesses high definition analog video signal decoding capability, generate the carrier signal of preset frequency, and the carrier signal of described preset frequency is sent to described video signal collection apparatus, owing to not possessing the video signal receiving apparatus of high definition analog video signal decoding capability and cannot generate and send the carrier signal of this preset frequency, thereby, the carrier signal that makes video signal collection apparatus self whether receive preset frequency by judging can judge whether video signal receiving apparatus supports high definition analog video signal form, whole process is without artificial participation, therefore, simplified the process that analog video signal Format Type is mated, improved the compatibility of video signal receiving apparatus.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (12)
1. analog video signal form is determined a system, it is characterized in that, comprises video signal collection apparatus and at least one video signal receiving apparatus, wherein:
Each video signal receiving apparatus, for when self possessing high definition analog video signal decoding capability, generate the carrier signal of preset frequency, and to described video signal collection apparatus, export the carrier signal of described preset frequency, wherein, the span of described preset frequency is F >=N+1, wherein, F represents preset frequency, and N represents analog video signal upper limiting frequency;
Described video signal collection apparatus, for judging the carrier signal of the preset frequency that self whether receives video signal receiving apparatus transmission; And when receiving the carrier signal of the preset frequency that described video signal receiving apparatus sends, determine that described video signal receiving apparatus supports high definition analog video signal form; Otherwise, determine that described video signal receiving apparatus do not support high definition analog video signal form.
2. analog video signal form as claimed in claim 1 is determined system, it is characterized in that,
Described video signal collection apparatus, also for when determining that described video signal receiving apparatus is supported high definition analog video signal form, to described video signal receiving apparatus output high definition analog video signal; And determine when described video signal receiving apparatus is not supported high definition analog video signal form, to described video signal receiving apparatus output SD analog video signal.
3. analog video signal form as claimed in claim 2 is determined system, it is characterized in that, preset frequency at least comprises the first preset frequency and the second preset frequency, and described the first preset frequency is higher than the second preset frequency; And
Described video signal collection apparatus, while being also the first preset frequency for definite described preset frequency, to described video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal; And determine when described preset frequency is the second preset frequency, to described video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
4. analog video signal form as claimed in claim 1 is determined system, it is characterized in that,
Described video signal receiving apparatus, also when possessing high definition analog video signal decoding capability at self, exports the carrier signal of described preset frequency to described video signal collection apparatus according to predetermined period; Or continuation is exported the carrier signal of described preset frequency to described video signal collection apparatus.
5. a video signal receiving apparatus, is characterized in that, comprising:
Signal generator, for generating the carrier signal of preset frequency, and exports the carrier signal of described preset frequency to video signal collection apparatus, wherein, the span of described preset frequency is F >=N+1, wherein, F represents preset frequency, and N represents analog video signal upper limiting frequency.
6. video signal receiving apparatus as claimed in claim 5, is characterized in that, also comprises:
Low pass filter, the high definition analog video signal or the SD analog video signal that for receiving and extract video signal collection apparatus, send;
Analog video signal receiver module, processes for high definition analog video signal or SD analog video signal that described low pass filter is extracted.
7. a video signal collection apparatus, is characterized in that, comprising:
Band pass filter, for extracting the carrier signal of the preset frequency of video signal receiving apparatus transmission, wherein, the span of described preset frequency is F >=N+1, and wherein, F represents preset frequency, and N represents analog video signal upper limiting frequency;
Frequency discriminator block, for judging whether described band pass filter extracts the carrier signal of preset frequency, if so, determine described video signal receiving apparatus support high definition analog video signal form, if not, determine that described video signal receiving apparatus do not support high definition analog video signal form.
8. video signal collection apparatus as claimed in claim 7, is characterized in that, also comprises:
Analog video signal sending module, for when determining that described video signal receiving apparatus is supported high definition analog video signal form, to described video signal receiving apparatus output high definition analog video signal; And determine when described video signal receiving apparatus is not supported high definition analog video signal form, to described video signal receiving apparatus output SD analog video signal.
9. video signal collection apparatus as claimed in claim 8, is characterized in that, preset frequency comprises the first preset frequency and the second preset frequency, and described the first preset frequency is higher than the second preset frequency; And
Described frequency discriminator block, while being also the first preset frequency for definite described preset frequency, determines described video signal receiving apparatus support first kind analog video signal form; And determine when described preset frequency is the second preset frequency, determine described video signal receiving apparatus support Equations of The Second Kind analog video signal form;
Described analog video signal sending module, while also determining that for described frequency discriminator block described video signal receiving apparatus is supported first kind analog video signal form, to described video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal; Described frequency discriminator block is determined when described video signal receiving apparatus is supported Equations of The Second Kind analog video signal form, to described video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
10. analog video signal form is determined a method, it is characterized in that, possesses the video signal receiving apparatus of high definition analog video signal decoding capability to the carrier signal of video signal collection apparatus output preset frequency; And
Described method, comprising:
Video signal collection apparatus is judged the carrier signal of the preset frequency that self whether receives video signal receiving apparatus transmission, and wherein, the span of described preset frequency is F >=N+1, and wherein, F represents preset frequency, and N represents analog video signal upper limiting frequency; And
When receiving the carrier signal of preset frequency of described video signal receiving apparatus output, determine that described video signal receiving apparatus supports high definition analog video signal form; In the carrier signal that does not receive the preset frequency of described video signal receiving apparatus output, determine that described video signal receiving apparatus do not support high definition analog video signal form.
11. methods as claimed in claim 10, is characterized in that, also comprise:
Video signal collection apparatus is when determining that described video signal receiving apparatus is supported high definition analog video signal form, to described video signal receiving apparatus output high definition analog video signal; And determine when described video signal receiving apparatus is not supported high definition analog video signal form, to described video signal receiving apparatus output SD analog video signal.
12. methods as claimed in claim 11, is characterized in that, preset frequency comprises the first preset frequency and the second preset frequency, and described the first preset frequency is higher than the second preset frequency; And
Video signal collection apparatus, to described video signal receiving apparatus output high definition analog video signal, specifically comprises:
Video signal collection apparatus is determined when described preset frequency is the first preset frequency, to described video signal receiving apparatus output first kind high definition analog video signal or Equations of The Second Kind high definition analog video signal; And determine when described preset frequency is the second preset frequency, to described video signal receiving apparatus output Equations of The Second Kind high definition analog video signal.
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