CN104918002A - Video transmission apparatus and method, and visual building intercom system - Google Patents
Video transmission apparatus and method, and visual building intercom system Download PDFInfo
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Abstract
The invention discloses a video transmission apparatus. The video transmission apparatus comprises a video acquisition module, a main control module, a video transceiver module and a video display module. The video transceiver module comprises a video conversion unit, a control unit, a transmission distance measurement unit, a video gain compensation unit, a communication unit and a video transmission unit. The video conversion unit is used for converting a video signal. The transmission distance measurement unit is used for sending a distance measurement signal to a purpose device or receiving a detection distance measurement signal sent by other devices. The communication unit is used for receiving a signal transmission distance returned by the purpose device. The control unit is used for calculating the signal transmission distance and confirming a gain compensation amount according to the signal transmission distance. The video gain compensation unit is used for carrying out automatic weighting gain compensation on a video signal. The invention also provides a video transmission method and a visual building intercom system. During video transmission, gain compensation can be automatically changed according to a transmission distance. Usage is simple.
Description
Technical field
The present invention relates to technical field of video communication, particularly relate to a kind of video frequency transmitter, method and storied building visible intercommunication system.
Background technology
Storied building visible intercommunication system is the mandatory auxiliary facility of Modern Residence, and the extensive use that the prosperity of real estate in recent years develops into storied building visible intercommunication system provides a good opportunity.
buildingvisible dialogue system refers to and building or groups of building such as being arranged on residential quarters, unit building, office building identifies visiting guest with image and sound, control door lock and run into emergency send to administrative center seek help, the integration of equipments of Call for assistance.
But in the practical application of building visual intercommunication, analog composite video signal (CVBS) long range propagation is all the time unsatisfactory, become a large factor of restriction visible dialogue system universalness.The gain of Video transmission system in the market controls to be divided into two kinds: a kind of is fixed gain transmission means, which exist transmission range near time vision signal excessively strong, long transmission distance time the shortcoming such as image diffusion; Another kind of for manually to arrange gain compensation, by manually adjusting gain potentiometer or gain toggle switch adjustment compensating gain, which needs to reset the shortcomings such as compensating gain after there is Installation and Debugging complexity, device location adjustment or transmission cable length adjustment, waste of manpower and financial resources.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of video frequency transmitter, method and storied building visible intercommunication system, and automatically can change gain compensation when transmission of video according to transmission range, image effect is good, uses simple.
In order to solve the problems of the technologies described above, the invention provides a kind of video frequency transmitter, comprise video acquisition module, main control module, video receiving module and video display module; Described video acquisition module is for gathering vision signal; Described video receiving module sends after being used for that the vision signal of collection is carried out different gain compensations according to different transmission ranges, and receives the vision signal of other devices transmission; The vision signal that described video display module sends for other devices showing the reception of described video receiving module; Described main control module for controlling described video acquisition module, described video receiving module and described video display module, and processes data;
Wherein, described video receiving module specifically comprises Video Quality Metric unit, control unit, transmission range measuring unit, video gain compensating unit, communication unit and Video Transmission Unit; Described transmission range measuring unit is used for by cable to destination device transmission range measuring-signal; The signal transmission distance that described communication unit returns for receiving described destination device, wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received; Described control unit is used for confirming gain compensation amount according to described signal transmission distance; Described Video Quality Metric unit, for changing the transmission mode of vision signal; Described video gain compensating unit is used for carrying out automatic weighted gain compensation according to described gain compensation amount to the vision signal after translative mode; Described Video Transmission Unit is used for the vision signal after being compensated by automatic weighted gain and sends, and receives the vision signal of other devices transmission; Described transmission range measuring unit is also for receiving the detecting distance measuring-signal that other devices send; Described control unit also calculates the signal transmission distance of other devices for the attenuation of the detecting distance measuring-signal sent according to described other devices; Described communication unit is also for being back to other devices described by the signal transmission distance of other devices described.
Present invention also offers a kind of video transmission method, described method passes transmission system based on the video comprising source apparatus and destination device, and described source apparatus and destination device are above-mentioned video frequency transmitter, then described method comprises:
Described source apparatus gathers vision signal;
Carry out gain compensation according to the vision signal of the different distance between described source apparatus and described destination device to transmission, and be sent to described destination device;
The vision signal that described destination device display receives;
Wherein, describedly carry out gain compensation according to the vision signal of the different distance between described source apparatus and described destination device to transmission, and be sent to described destination device, specifically comprise:
The transmission range measuring unit of described source apparatus is to described destination device transmission range measuring-signal;
The control unit of described source apparatus receives the signal transmission distance that described destination device returns, and wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received;
The control unit of described source apparatus confirms gain compensation amount according to described signal transmission distance;
The transmission mode of Video Quality Metric unit to the vision signal gathered of described source apparatus is changed;
The video gain compensating unit of described source apparatus carries out pre-lift according to described gain compensation amount to the HFS of the vision signal after translative mode;
The Video Transmission Unit of described source apparatus by the video signal transmission after promoting to the gain compensation unit of described destination device;
The gain compensation unit of described destination device carries out post-compensation according to the high and low frequency part of described gain compensation amount to the vision signal received;
The Video Quality Metric unit of described destination device is changed the signal that gain compensation unit passes over, then transfers to the display of described destination device video display module.
Present invention also offers a kind of storied building visible intercommunication system, comprise at least two above-mentioned video frequency transmitters, connected by cable between described video frequency transmitter.
The present invention can change gain compensation when transmission of video according to transmission range automatically, and to vision signal auto-compensation, therefore image is more clear and stable, can not become far away and fuzzy because of transmission range; In addition need not human intervention during transmission, reduce engineering difficulty, use simple, reduce cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of an embodiment of video frequency transmitter provided by the invention;
Fig. 2 is the concrete structure schematic diagram of video receiving module in Fig. 1;
Fig. 3 is the physical circuit figure of transmission range measuring unit in Fig. 2;
Fig. 4 is the connection layout of transmission range measuring unit;
Fig. 5 is the circuit diagram of pre-lift subelement;
Fig. 6 is the circuit diagram of post-compensation subelement;
Fig. 7 is the schematic flow sheet of an embodiment of video transmission method provided by the invention;
Fig. 8 is the flow chart of data processing figure of step S22 in Fig. 7;
Fig. 9 is the structural representation of an embodiment of storied building visible intercommunication system provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of an embodiment of video frequency transmitter provided by the invention, as shown in Figure 1, comprises video acquisition module 11, main control module 12, video receiving module 13 and video display module 14; Described video acquisition module 11 is for gathering vision signal; Described video receiving module 13 sends after the vision signal of collection is carried out different gain compensations according to different transmission ranges, and receives the vision signal of other devices transmission; The vision signal that described video display module 14 receives for showing described video receiving module; Described main control module 13 for controlling described video acquisition module 11, described video receiving module 13 and described video display module 14, and processes data.
As shown in Figure 2, described video receiving module 13 specifically comprises Video Quality Metric unit 131, control unit 132, transmission range measuring unit 133, video gain compensating unit 134, communication unit 135 and Video Transmission Unit 136; Described transmission range measuring unit 133 for by cable to destination device transmission range measuring-signal; The signal transmission distance that described communication unit 135 returns for receiving described destination device, wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received; Described control unit 132 is for confirming gain compensation amount according to described signal transmission distance; Described Video Quality Metric unit 131, for changing the transmission mode of the vision signal gathered; Described video gain compensating unit 134 is for carrying out automatic weighted gain compensation according to described gain compensation amount to the vision signal after translative mode; Described Video Transmission Unit 136 for the vision signal after automatic weighted gain compensation being sent, and receives the vision signal of other devices transmission; Described transmission range measuring unit 133 is also for receiving the detecting distance measuring-signal that other devices send; Described control unit 132 also calculates the signal transmission distance of other devices for the attenuation of the detecting distance measuring-signal sent according to described other devices; Described communication unit 135 is also for being back to other devices described by the signal transmission distance of other devices described.
Wherein, as shown in Figure 3, described transmission range measuring unit 133 specifically comprises:
Sine wave oscillation circuit 1331, for generation of the sine wave of a certain frequency, described sine wave is described distance measurement signals;
Push-pull circuit 1332, connects described sine wave oscillation circuit 1031, for improving driving force described distance measurement signals is carried out long range propagation;
Relay 1333, moved end does not connect described cable, first moved end connects described push-pull circuit 1332, second moved end connects magnitude demodulator circuit 1334, sending described distance measurement signals during for switching in the first moved end, when switching in the second moved end, making described magnitude demodulator circuit 1334 receive described detecting distance measuring-signal;
Magnitude demodulator circuit 1334, for receiving and detecting the amplitude of described detecting distance measuring-signal;
Follow circuit 1335, for improve the amplitude of described detecting distance measuring-signal driving force after be sent to described control unit;
Distance measuring signal commutation circuit 1336, connects described relay 1333, switches for the path controlling described relay 1333.The controlled unit 132 of distance measuring signal commutation circuit 1336 controls.
Concrete, as shown in Figure 4, the measuring process of transmission range measuring unit 133 is:
Source apparatus produces distance measurement signals by sine wave oscillation circuit and push-pull circuit, and by control RC1, distance measuring signal commutation circuit switches to transmission state, thus distance measurement signals is inputted transmission cable transmits;
Transmission line by controls RC1, switches and accepting state by destination device, and distance measurement signals is inputted magnitude demodulator circuit reception rectification circuit and carry out magnitude demodulator;
MCU control unit carries out AD collection to the amplitude voltage value that the distance measurement signals received exports, and according to the magnitude of voltage collected, is stored in the distance of MCU inside by comparison--and voltage matches table, judges the transmission range of cable; Cable distance and distance measuring signal amplitude voltage matching list are as shown in Table 1.
Table one
Wherein, described Video Quality Metric unit 131 specifically comprises:
Video single-ended transfer difference circuit, for being converted to difference video signal by the vision signal of the video acquisition module collection of self;
Video difference turns single-end circuit, is converted to single-end video signals to show for the difference video signal sended over by other devices received.
Wherein, by using Agilent E5071B network analyzer test cable attenuation, as shown in Table 2
Table two
Wherein, described video gain compensating unit specifically comprises:
Pre-lift subelement, the HFS for the described difference video signal that will send self according to described gain compensation amount carries out pre-lift, concrete, as shown in Figure 5, described pre-lift subelement specifically comprises the first pre-lift branch road in parallel, second pre-lift branch road and the 3rd pre-lift branch road, described first pre-lift branch road comprises the first control switching circuit, the first relay be connected with described first control switching circuit, the RC series circuit be connected with one end of described first relay, described second pre-lift branch road comprises the second control switching circuit, the second relay be connected with described second control switching circuit, two RC series circuits of the parallel connection be connected with one end of described second relay, described 3rd pre-lift branch road comprises the 3rd control switching circuit, the 3rd relay be connected with described 3rd control switching circuit, three RC series circuits of the parallel connection be connected with one end of described 3rd relay, described first control switching circuit, the second control switching circuit are connected described control unit respectively with the 3rd control switching circuit, described first relay, the second relay and the other end of the 3rd relay are connected the inverting feedback end of described video single-ended transfer difference circuit respectively, the other end of all RC series circuits connects the homophase feedback end of described video single-ended transfer difference circuit respectively, and the HFS for the difference video signal by described video single-ended transfer difference circuit conversion carries out pre-lift, wherein, FBP end and FBN end are gain feedback ends, for arranging gain, CTR5, CTR6, CTR7 are the inputs of control switching circuit, are controlled by control unit, concrete input table as shown in Table 3,
Table three
Post-compensation subelement, for carrying out rear gain compensation according to described gain compensation amount to the low frequency part of the difference video signal that other devices received send and HFS; Concrete, as shown in Figure 6, described post-compensation subelement specifically comprises the post-compensation branch road of some parallel connections, the RC circuit that post-compensation branch road described in each all comprises a control circuit and is connected with described control circuit, described RC circuit comprises two RC series circuits and a resistance series circuit, described two RC series circuits and a resistance series circuit parallel connection; Described control circuit also connects described control unit, and described RC circuit connects the feedback end FB that described video difference turns single-end circuit and holds, and carries out post-compensation for the difference video signal sent by other devices received.Wherein, FB end is feedback end, connects video difference and turns single-end circuit; CTR1, CTR2, CTR3, CTR4 are the inputs of control circuit, are controlled by control unit, concrete input table as shown in Table 4,
Table four
Fig. 7 is the schematic flow sheet of an embodiment of video transmission method provided by the invention, described method passes transmission system based on the video comprising source apparatus and destination device, described source apparatus and destination device are video frequency transmitter described above, wherein, described source apparatus is the destination device of other devices simultaneously.
Video transmission method of the present invention comprises:
S21, described source apparatus gather vision signal;
S22, carry out gain compensation according to the vision signal of the different distance between described source apparatus and described destination device to transmission, and be sent to described destination device;
The vision signal that the display of S23, described destination device receives.
Wherein, the handling process of the signal of step S22, respectively as shown in 2 ~ 13 in Fig. 8, is the signal transacting step between source apparatus and destination device, and indicating 1 in Fig. 8 is step S21.With reference to Fig. 8, step S22 specifically comprises:
The transmission range measuring unit of S221, described source apparatus, to described destination device transmission range measuring-signal, indicates 2 and 3 with reference in Fig. 8.
The control unit of S222, described source apparatus receives the signal transmission distance that described destination device returns, and wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received; 4,5,6 are indicated with reference in Fig. 8.
Indicating 4,5,6 concrete steps in Fig. 8 is:
4, the transmission range measuring unit of destination device receives detecting distance measuring-signal and reaches its control unit;
5, the control unit of destination device calculates signal transmission distance according to the attenuation of the detecting distance measuring-signal received, and sends to its communication unit;
6, signal transmission distance is sent to the communication unit of source apparatus by the communication unit of destination device.
The control unit of S223, described source apparatus confirms gain compensation amount according to described signal transmission distance.7 are indicated with reference in Fig. 8.
The transmission mode of Video Quality Metric unit to the vision signal gathered of S224, described source apparatus is changed.8 are indicated with reference in Fig. 8.
The video gain compensating unit of S225, described source apparatus carries out pre-lift according to described gain compensation amount to the HFS of the vision signal after translative mode.9 are indicated with reference in Fig. 8.
The Video Transmission Unit of S226, described source apparatus by the video signal transmission after promoting to the gain compensation unit of described destination device.10 are indicated with reference in Fig. 8.
The gain compensation unit of S227, described destination device carries out post-compensation according to the high and low frequency part of described gain compensation amount to the vision signal received.11 are indicated with reference in Fig. 8.
The Video Quality Metric unit of S228, described destination device is changed the signal that gain compensation unit passes over, then transfers to the display of described destination device video display module.12,13 are indicated with reference in Fig. 8.
Fig. 9 is the structural representation of an embodiment of storied building visible intercommunication system provided by the invention, comprises at least two above-mentioned video frequency transmitters 31, is connected between described video frequency transmitter 31 by cable 32.
Wherein, described cable 32 is coaxial cable or twisted-pair feeder.
The present invention can change gain compensation when transmission of video according to transmission range automatically, and to vision signal auto-compensation, therefore image is more clear and stable, can not become far away and fuzzy because of transmission range; In addition need not human intervention during transmission, reduce engineering difficulty, use simple, reduce cost.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. a video frequency transmitter, is characterized in that, comprises video acquisition module, main control module, video receiving module and video display module; Described video acquisition module is for gathering vision signal; Described video receiving module sends after being used for that the vision signal of collection is carried out different gain compensations according to different transmission ranges, and receives the vision signal of other devices transmission; The vision signal that described video display module sends for other devices showing the reception of described video receiving module; Described main control module for controlling described video acquisition module, described video receiving module and described video display module, and processes data;
Wherein, described video receiving module specifically comprises Video Quality Metric unit, control unit, transmission range measuring unit, video gain compensating unit, communication unit and Video Transmission Unit; Described transmission range measuring unit is used for by cable to destination device transmission range measuring-signal; The signal transmission distance that described communication unit returns for receiving described destination device, wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received; Described control unit is used for confirming gain compensation amount according to described signal transmission distance; Described Video Quality Metric unit, for changing the transmission mode of vision signal; Described video gain compensating unit is used for carrying out automatic weighted gain compensation according to described gain compensation amount to the vision signal after translative mode; Described Video Transmission Unit is used for the vision signal after being compensated by automatic weighted gain and sends, and receives the vision signal of other devices transmission; Described transmission range measuring unit is also for receiving the detecting distance measuring-signal that other devices send; Described control unit also calculates the signal transmission distance of other devices for the attenuation of the detecting distance measuring-signal sent according to described other devices; Described communication unit is also for being back to other devices described by the signal transmission distance of other devices described.
2. video frequency transmitter as claimed in claim 1, it is characterized in that, described transmission range measuring unit specifically comprises:
Sine wave oscillation circuit, for generation of the sine wave of a certain frequency, described sine wave is described distance measurement signals;
Push-pull circuit, connects described sine wave oscillation circuit, for improving driving force described distance measurement signals is carried out long range propagation;
Relay, moved end does not connect described cable, and the first moved end connects described push-pull circuit, and the second moved end connects magnitude demodulator circuit, sending described distance measurement signals during for switching in the first moved end, when switching in the second moved end, making described magnitude demodulator circuit receive described detecting distance measuring-signal;
Magnitude demodulator circuit, for receiving and detecting the amplitude of described detecting distance measuring-signal;
Follow circuit, for improve the amplitude of described detecting distance measuring-signal driving force after be sent to described control unit;
Distance measuring signal commutation circuit, connects described relay, switches for the path controlling described relay.
3. video frequency transmitter as claimed in claim 1, it is characterized in that, described Video Quality Metric unit specifically comprises:
Video single-ended transfer difference circuit, for being converted to difference video signal by the vision signal of the video acquisition module collection of self;
Video difference turns single-end circuit, is converted to single-end video signals to show for the difference video signal sended over by other devices received.
4. video frequency transmitter as claimed in claim 3, it is characterized in that, described video gain compensating unit specifically comprises:
Pre-lift subelement, the HFS for the described difference video signal that will send self according to described gain compensation amount carries out pre-lift;
Post-compensation subelement, for carrying out rear gain compensation according to described gain compensation amount to the low frequency part of the difference video signal that other devices received send and HFS.
5. video frequency transmitter as claimed in claim 4, it is characterized in that, described pre-lift subelement specifically comprises the first pre-lift branch road in parallel, second pre-lift branch road and the 3rd pre-lift branch road, described first pre-lift branch road comprises the first control switching circuit, the first relay be connected with described first control switching circuit, the RC series circuit be connected with one end of described first relay, described second pre-lift branch road comprises the second control switching circuit, the second relay be connected with described second control switching circuit, two RC series circuits of the parallel connection be connected with one end of described second relay, described 3rd pre-lift branch road comprises the 3rd control switching circuit, the 3rd relay be connected with described 3rd control switching circuit, three RC series circuits of the parallel connection be connected with one end of described 3rd relay, described first control switching circuit, the second control switching circuit are connected described control unit respectively with the 3rd control switching circuit, described first relay, the second relay and the other end of the 3rd relay are connected described video single-ended transfer difference circuit inverting feedback end respectively, the other end of all RC series circuits connects described video single-ended transfer difference circuit homophase feedback end respectively, and the HFS for the difference video signal by described video single-ended transfer difference circuit conversion carries out pre-lift,
Described post-compensation subelement specifically comprises the post-compensation branch road of some parallel connections, the RC circuit that post-compensation branch road described in each all comprises a control circuit and is connected with described control circuit, described RC circuit comprises two RC series circuits and a resistance series circuit, described two RC series circuits and a resistance series circuit parallel connection; Described control circuit also connects described control unit, and described RC circuit connects the feedback end that described video difference turns single-end circuit, carries out post-compensation for the difference video signal sent by other devices received.
6. a video transmission method, it is characterized in that, described method passes transmission system based on the video comprising source apparatus and destination device, and described source apparatus and destination device are for as the video frequency transmitter in claim 1-3 as described in any one, then described method comprises:
Described source apparatus gathers vision signal;
Carry out gain compensation according to the vision signal of the different distance between described source apparatus and described destination device to transmission, and be sent to described destination device;
The vision signal that described destination device display receives;
Wherein, describedly carry out gain compensation according to the vision signal of the different distance between described source apparatus and described destination device to transmission, and be sent to described destination device, specifically comprise:
The transmission range measuring unit of described source apparatus is to described destination device transmission range measuring-signal;
The control unit of described source apparatus receives the signal transmission distance that described destination device returns, and wherein, described signal transmission distance is that described destination device calculates according to the attenuation of the detecting distance measuring-signal received;
The control unit of described source apparatus confirms gain compensation amount according to described signal transmission distance;
The transmission mode of Video Quality Metric unit to the vision signal gathered of described source apparatus is changed;
The video gain compensating unit of described source apparatus carries out pre-lift according to described gain compensation amount to the HFS of the vision signal after translative mode;
The Video Transmission Unit of described source apparatus by the video signal transmission after promoting to the gain compensation unit of described destination device;
The gain compensation unit of described destination device carries out post-compensation according to the high and low frequency part of described gain compensation amount to the vision signal received;
The Video Quality Metric unit of described destination device is changed the signal that gain compensation unit passes over, then transfers to the display of described destination device video display module.
7. video transmission method as claimed in claim 6, it is characterized in that, described source apparatus is the destination device of other devices simultaneously.
8. a storied building visible intercommunication system, is characterized in that, comprises at least two as the video frequency transmitter in claim 1-3 as described in any one, is connected between described video frequency transmitter by cable.
9. storied building visible intercommunication system as claimed in claim 8, it is characterized in that, described cable is coaxial cable.
10. storied building visible intercommunication system as claimed in claim 8, it is characterized in that, described cable is twisted-pair feeder.
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| CN201510068235.9A CN104918002B (en) | 2015-02-10 | 2015-02-10 | Video frequency transmitter, method and storied building visible intercommunication system |
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| CN2938187Y (en) * | 2006-08-02 | 2007-08-22 | 深圳达实智能股份有限公司 | Building controller based on Enthernet |
| CN102821265A (en) * | 2012-08-09 | 2012-12-12 | 厦门狄耐克电子科技有限公司 | Video transmission method and building video doorphone system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2720732Y (en) * | 2004-01-17 | 2005-08-24 | 卢俊 | Wide-band modulator, demodulator and intelligent housing estate system |
| CN1953546A (en) * | 2006-06-08 | 2007-04-25 | 中山市奥敏电子有限公司 | Visual building conversation system |
| CN2938187Y (en) * | 2006-08-02 | 2007-08-22 | 深圳达实智能股份有限公司 | Building controller based on Enthernet |
| CN102821265A (en) * | 2012-08-09 | 2012-12-12 | 厦门狄耐克电子科技有限公司 | Video transmission method and building video doorphone system |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Video transmission apparatus and method, and visual building intercom system Effective date of registration: 20190426 Granted publication date: 20160330 Pledgee: Xiamen finance Company limited by guarantee Pledgor: Xiamen xingtel intelligent Polytron Technologies Inc Registration number: 2019990000366 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20190730 Granted publication date: 20160330 Pledgee: Xiamen finance Company limited by guarantee Pledgor: Xiamen xingtel intelligent Polytron Technologies Inc Registration number: 2019990000366 |