CN101459832A - Visible intercom door inhibition apparatus with simple installation - Google Patents
Visible intercom door inhibition apparatus with simple installation Download PDFInfo
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- CN101459832A CN101459832A CNA2009101108243A CN200910110824A CN101459832A CN 101459832 A CN101459832 A CN 101459832A CN A2009101108243 A CNA2009101108243 A CN A2009101108243A CN 200910110824 A CN200910110824 A CN 200910110824A CN 101459832 A CN101459832 A CN 101459832A
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Abstract
The invention relates to a visual intercommunication entrance guard device with simple installation, which comprises an entrance machine and one or a plurality of quantizers, wherein the entrance machine is orderly connected with a plurality of the quantizers through an Ethernet cable. The device is characterized in that the entrance machine and the quantizers comprise a CPU and a complete machine wire leading-out connector, and the visual intercommunication system whose installation is realized through a sound communication circuit, a video coding and driving circuit, a card-reading circuit and the like.
Description
Technical field
The present invention relates to security protection control and voice, video communication intercommunication field, refer to the simple video intercom entrance guard device of a kind of installation especially.
Background technology
Existing security protection visible dialogue system is various informative, but most of utility functions are comprehensive inadequately, and these the device in adopted more audio frequency, video, electric power and digital signal respectively transmission manner carry out communication, caused the connection line complexity of whole device, the easy entanglement of line preface, so its mean time between failures is not high, and fault is embodied on the cable mostly.
Summary of the invention
The purpose of this invention is to provide the simple video intercom entrance guard device of a kind of installation, this device connects by an Ethernet cable line, interface is clear and succinct, each module independence is strong, not only memory capacity is big, and do not influence system running speed, can not cause system to be paralysed because of local fault comprehensively.
The present invention is the simple video intercom entrance guard device of a kind of installation, comprises a doorway machine and one or more quantizer; Connect successively by an Ethernet cable between described doorway machine and one or more quantizer; It is characterized in that: described doorway machine comprises that CPU and complete machine go out wiring connector; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit, Card Reader circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other; Described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit;
Described quantizer comprises that CPU and complete machine go out wiring connector; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit and user's commutation circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other, and described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit; Described video coding drive circuit also links to each other with user's commutation circuit, and described user's commutation circuit is connected with the indoor set connector;
Described video coding drive circuit adopts the design of EL5171 differential signal transceiving chip, and described audio encoding and decoding drive circuit adopts the design of EL5172 differential signal transceiving chip;
Described CPU realizes the storage of many cards by hashing algorithm and reads, it is characterized in that: pre-set n formation, the object that sort is drawn it by certain hashing algorithm will belong to which formation, then this object is inserted this formation; Also be to obtain formation earlier when searching, in this formation, search this object then by hashing algorithm.
Description of drawings
Fig. 1 is system's connection diagram of the embodiment of the invention.
Fig. 2 is the schematic block circuit diagram of the doorway machine of the embodiment of the invention.
Fig. 3 is the schematic block circuit diagram of the quantizer of the embodiment of the invention.
Fig. 4 is the differential mode transmission video signal schematic diagram of the embodiment of the invention.
Fig. 5 is the card typing and the search procedure schematic diagram of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further.
As shown in Figure 1, the invention discloses the simple video intercom entrance guard device of a kind of installation, comprise a doorway machine and one or more quantizer; Connect successively by an Ethernet cable between described doorway machine and one or more quantizer; Doorway machine comprises that CPU and complete machine go out wiring connector as shown in Figure 2; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit, Card Reader circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other; Described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit; Adopt the PIC18F45J10 Series chip at the CPU described in this preferred embodiment, described Card Reader circuit adopts the U2270B chip design, can read non-contact IC card, system stores the data of the IC-card of having registered by outside flash storage chip AT45DB161D; AT45DB161D is a outside flash storage chip that atmel corp produces, has 4096 pages, every page 528 byte, amount to about 2M bytes of memory space, it can carry out read and write access by spi bus, and the maximum clock frequency of this visit can reach 66MHz (directly main memory accesses is 33MHz).Read write command generally is that command header+address [+data] is formed, and multiple modes such as byte read-write, piece read-write, fast cache buffer read-write are arranged.It not only can store the card data of this machine of being registered in present embodiment, can also store the time (record that can be used for work attendance) of each card Card Reader.The general compatible format of contactless ic (RF) card is 64bits, adopt the Manchester coded format, there is 9bits to be used for preamble synchronization among the 64bits, 15bits is used for verification, the historical facts or anecdotes border represents that the data of card number are 40bits, i.e. 5 bytes, wherein two bytes producer's sign often, back 3 bytes are user ID commonly used, can use the 3-5 byte to store a card number according to security requirement in actual the use.Comprehensive safety performance of the present invention and storage are considered, use card number of 4 bytes store.
Can reach the speed of 66MHz though what deserves to be mentioned is the spi bus of AT45DB161D, limited by the speed of service of CPU itself, the SPI communication speed of AT45DB161D and CPU is 10MHz in this case.The present invention once attempted the simplest linear search algorithm.Though this algorithm design is simple, the speed of moving on the CPU of this 8bit is very slow.A spot of card retrieval rate can also be accepted, but the speed of a large amount of cards retrieval just allows the people be difficult to stand.And owing to be subjected to the restriction of cost, got rid of and used high-grade CPU.So can only make an issue of on algorithm, the algorithm of optimizing oneself improves the speed of operation.
If the simplest the sort of algorithm is arranged the storage card number by linear precedence, suppose to have preserved 4000 cards, 4000 cards need take 32 pages of outside flash storage chip.
The hit probability of the random access of every card is identical, on average searches 2000 times and can hit.Expense average time of then searching a card is:
Average search time=16*t1+2000*t2;
Time overhead under the worst case is
Maximum search time=32*t1+4000*t2;
Here t1 represents a page or leaf among the AT45DB161D is read the time overhead of CPU, and t2 represents to search the time of the data whether this card is arranged.Because CPU is when reading memory, whether its software also will monitor has the user to supress button, whether task such as customer call is arranged.So such expense obviously will take too much cpu resource, also can cause the phenomenon blunt in actual the use to user's operant response.
The present invention has used the technology of hash, has effectively solved to hold large batch of card, guarantees the quick response of user's Card Reader again.
So-called hash is to be used to solve exterior storage ordering and the effective technology of searching in the data structure, its principle is to pre-set n formation, the object that will sort is drawn it by certain hashing algorithm will belong to which formation, then this object is inserted this formation; Also be to obtain formation earlier when searching, in this formation, search this object then by hashing algorithm.Here the key of hashing algorithm will guarantee the even of the distribution of all objects in individual queue.
The present invention is the input of the card number of RF card as hash function, adopts 128 pages of storage card numbers, and every page in the outside flash storage chip as a memory block, and Fig. 5 has represented the card typing and the search procedure of this algorithm.The present invention uses special algorithm, with the ID of each card, calculates a characteristic value.According to this characteristic value card is classified, this card is dropped in the memory block corresponding with characteristic value.Because the number of characteristic value is far smaller than the sum of card.So just do not need to have searched all cards when searching.Search a card number as long as a certain definite page or leaf of visit so on average search the visit expense is
Average search time=t1+ (4000/256) * t2;
The worst time overhead is
Maximum search time=t1+128*t2;
Here t1 represents a page or leaf among the AT45DB161D is read the time overhead of CPU, and t2 represents the time overhead that card number of comparison is whether identical.Compare with linear ordering, fast a lot.Certainly, cost is to have sacrificed some memory spaces (need 128 memory pages here, and linear ordering only needing 32 memory pages when 4000 cards), sacrifice 100 multipages 4096 pages of AT45DB161D to exchange response speed for, what still the advantages outweigh the disadvantages.Because AT45DB161D's is cheap.
Another problem that needs in the hashing algorithm to solve is that conflict solves, because each formation can only be stored 128 cards, though there have 128 cards to belong to the probability of same formation in 2000 cards to be very low, if but want to handle the mechanism of handling when this situation takes place well, this case employing is added 2 conflict memory pages and is preserved the card number of those " conflict is overflowed ", arranged full such as the second formation, at this moment an another card is inserted into the second formation according to hash function also needs, that just is inserted into this card number in the conflict memory page, when the conflict memory page just forbids that the user registers this card when also saturated, (probability that certain this situation takes place unusual low).
If it also is by such algorithm that the user will delete certain specific card, finds out the position at card place with such fast algorithm, and delete it.
By above algorithm, in the reality test, this method is under several card registrations and a large amount of (having surveyed 4000 capacity) registered two kinds of situations, to the insertion of card number, the response time basically identical of searching, deleting.Move on the low side CPU of 8bit, the user does not feel the difference of coming the two at all.
This external system is also realized time clock feature by the RTC time circuit, and utilizes alphanumeric keypad and LED display circuit to realize man-machine exchange.
Quantizer comprises that CPU and complete machine go out wiring connector as shown in Figure 3; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit and user's commutation circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other, and described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit; Described video coding drive circuit also links to each other with user's commutation circuit, and described user's commutation circuit is connected with the indoor set connector; In this preferred embodiment, user's commutation circuit is a four-function family commutation circuit, and it can connect 4 indoor connectors.
The present invention adopts differential mode to decompose vision signal, and is equipped with twisted-pair feeder as the transmission wire rod.Even under strong interference environment, its antijamming capability is good more than coaxial cable, and passes through Video signal processing, and its image transmitted signal is also clear than coaxial cable, and same netting twine can not disturb each other.Concrete advantage is as follows:
1, wiring is convenient, cable utilance height.The common five class netting twines that surpass, in 4 pairs of twisted-pair feeders are arranged, simultaneously transmission of video, audio frequency, power supply and control signal; And netting twine lays than coaxial cable is better.
2, price advantage.The common price that surpasses five class netting twines is equivalent to the 75-3 video line, and the price that outdoor water-proof surpasses five class netting twines is equivalent to the 75-5 video line, but netting twine can transmit multiple signals simultaneously, and one of coaxial cable can only the transmission of one line vision signal
3, long transmission distance, laser propagation effect is good.
4, antijamming capability is strong.The differential transfer method is adopted in the twisted-pair feeder transmission, and its antijamming capability is greater than coaxial cable.
Amplitude equates its basic principle in order will single-ended vision signal at transmitting terminal to convert to, opposite polarity difference video signal and transmit by twisted-pair feeder, then two opposite polarity difference video signals is subtracted each other at receiving terminal and becomes single-ended vision signal.
Video coding drive circuit of the present invention herein and audio encoding and decoding drive circuit have adopted the EL5171 and the EL5172 differential signal transceiving chip of Intersil company, after doorway machine one end is converted to differential signal with the vision signal of camera output, transfers to the floor quantizer, differential signal is converted to single-ended video again and sends into indoor set.And at transmitting terminal high-frequency signal is promoted in advance, carried out signal compensation at receiving terminal.Can guarantee that not only black-and-white video signal is complete, clear picture, contrast is full.And the colourity of colour-video signal, indexs such as contrast have been guaranteed.Every national standard and user's index have been reached fully.Differential operational amplifier because it is subjected to influence of temperature change bigger, in order to guarantee normal steady operation, also can add control temperature drift device when work.And output signal is carried out voltage clamping prevent surge voltage impacts such as thunder and lightning, as shown in Figure 4.
The present invention is realizing on the traditional function bases such as video intercom, image monitoring that by an Ethernet cable line connection, interface is clear and succinct, and each module independence is strong, can not cause system to be paralysed because of local fault comprehensively.
Claims (7)
1, the simple video intercom entrance guard device of a kind of installation comprises a doorway machine and one or more quantizer; Connect successively by an Ethernet cable between described doorway machine and one or more quantizer; It is characterized in that: described doorway machine comprises that CPU and complete machine go out wiring connector; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit, Card Reader circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other; Described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit;
Described quantizer comprises that CPU and complete machine go out wiring connector; Described CPU is connected with communicating circuit, voice call circuit, video coding drive circuit and user's commutation circuit; Described voice call circuit goes out wiring connector by audio encoding and decoding drive circuit and complete machine and links to each other, and described complete machine goes out wiring connector and links to each other with the output of communicating circuit and video coding drive circuit; Described video coding drive circuit also links to each other with user's commutation circuit, and described user's commutation circuit is connected with the indoor set connector;
Described video coding drive circuit adopts the design of EL5171 differential signal transceiving chip, and described audio encoding and decoding drive circuit adopts the design of EL5172 differential signal transceiving chip;
Described CPU realizes the storage of many cards by hashing algorithm and reads, it is characterized in that: pre-set n formation, the object that sort is drawn it by certain hashing algorithm will belong to which formation, then this object is inserted this formation; Also be to obtain formation earlier when searching, in this formation, search this object then by hashing algorithm.
2, the simple video intercom entrance guard device of installation according to claim 1 is characterized in that: described CPU adopts the PIC18F45J10 Series chip.
3, the simple video intercom entrance guard device of installation according to claim 1, it is characterized in that: the CPU of described doorway machine also is connected with outside flash storage chip, is used to store the data of accreditation card.
4, the simple video intercom entrance guard device of installation according to claim 1, it is characterized in that: the CPU of described doorway machine also is connected with the RTC time circuit, for system provides time clock feature.
5, the simple video intercom entrance guard device of installation according to claim 1, it is characterized in that: the CPU of described doorway machine also is connected with keyboard and LED display circuit, realizes man-machine interaction.
6, the simple video intercom entrance guard device of installation according to claim 1, it is characterized in that: described user's commutation circuit can connect four indoor set connectors.
7, the simple video intercom entrance guard device of installation according to claim 1, it is characterized in that: described Card Reader circuit can read contactless IC card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101108243A CN101459832A (en) | 2009-01-08 | 2009-01-08 | Visible intercom door inhibition apparatus with simple installation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101108243A CN101459832A (en) | 2009-01-08 | 2009-01-08 | Visible intercom door inhibition apparatus with simple installation |
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| CN101459832A true CN101459832A (en) | 2009-06-17 |
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| CNA2009101108243A Pending CN101459832A (en) | 2009-01-08 | 2009-01-08 | Visible intercom door inhibition apparatus with simple installation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143357A (en) * | 2011-05-09 | 2011-08-03 | 施勒智能建筑系统（上海）有限公司 | Methods for transmitting audio, video and data by using category-5 network cable |
| CN104023196A (en) * | 2013-10-16 | 2014-09-03 | 深圳市麦驰安防技术有限公司 | Coaxial cable unshielded twisted pair fiber intercom system hybrid networking method |
| CN107979484A (en) * | 2016-10-25 | 2018-05-01 | 北京佳讯飞鸿电气股份有限公司 | A kind of scheduling system and method with a variety of communication functions |
-
2009
- 2009-01-08 CN CNA2009101108243A patent/CN101459832A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143357A (en) * | 2011-05-09 | 2011-08-03 | 施勒智能建筑系统（上海）有限公司 | Methods for transmitting audio, video and data by using category-5 network cable |
| CN104023196A (en) * | 2013-10-16 | 2014-09-03 | 深圳市麦驰安防技术有限公司 | Coaxial cable unshielded twisted pair fiber intercom system hybrid networking method |
| CN107979484A (en) * | 2016-10-25 | 2018-05-01 | 北京佳讯飞鸿电气股份有限公司 | A kind of scheduling system and method with a variety of communication functions |
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Open date: 20090617 |