CN118075415A - Audio and video data transmission system in elevator based on power transmission line - Google Patents
Audio and video data transmission system in elevator based on power transmission line Download PDFInfo
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- CN118075415A CN118075415A CN202410480402.XA CN202410480402A CN118075415A CN 118075415 A CN118075415 A CN 118075415A CN 202410480402 A CN202410480402 A CN 202410480402A CN 118075415 A CN118075415 A CN 118075415A
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Abstract
The invention provides an elevator inner audio and video data transmission system based on a power transmission line, which comprises a shielding cable arranged in the power transmission line, wherein an audio and video signal receiving unit and a car control board in an elevator car are respectively connected through the shielding cable, the car control board is connected with the car audio and video unit, the car audio and video unit collects audio and video data in the car and then sends the data into the car control board, the collected audio and video data is sent to the audio and video signal receiving unit through the car control board, and the car control board carries out differential signal transmission through the shielding cable; the elevator car control board receives triggering signals of the signal triggering units after the elevator car passes through the signal triggering units, amplifies audio and video data through a signal amplifier in the elevator car control board, and monitors received differential signals in real time.
Description
Technical Field
The invention belongs to the field of elevator data transmission, and particularly relates to an audio/video data transmission system in an elevator based on a power transmission line.
Background
In modern society, elevators have become indispensable vehicles in high-rise buildings. In order to ensure safety and comfort of passengers, elevators are often equipped with an audio-visual system for playing background music, broadcasting information, or real-time monitoring. However, the transmission of audiovisual data within an elevator faces some special challenges.
There is a significant amount of electromagnetic interference within the elevator hoistway, which may come from elevator motors, lighting equipment, communication equipment, etc. These disturbances may affect the transmission of the audio-visual signal, resulting in a reduced signal quality and even in the event of a signal interruption.
The space of the elevator hoistway is limited and often cannot accommodate a large number of cables. Accordingly, audio and video data within an elevator is typically required to be transmitted over existing power lines. However, power lines are not designed for data transmission, they may not provide sufficient bandwidth, or may not provide consistent signal quality.
The operating state of the elevator may also have an influence on the transmission of audio and video data. For example, when an elevator is in operation, fluctuations in the supply voltage may be caused due to acceleration and deceleration of the elevator, which may have an influence on the transmission of the audio-visual signal.
The audio and video data in the elevator usually need to be transmitted in real time, which puts high demands on the stability and real-time performance of data transmission. However, existing powerline-based audio-video data transmission systems often fail to meet these requirements. Therefore, there is a need for an audio/video data transmission system in an elevator based on a power line.
To solve these problems, developers seek innovative technical solutions. One possible approach is to integrate a shielded cable in the transmission line, which can effectively isolate electromagnetic interference, improving the stability and anti-interference capability of the signal. The shielded cable adopts metal shielding layer, such as aluminium foil or copper mesh etc. to wrap up outside insulating material, can absorb or reflect interference signal to the audio/video signal of protection inside does not receive the interference.
In addition, the use of differential signaling techniques is an effective means of improving the quality of the signal transmission. The differential signal transmits signals with opposite phases through two lines, and the receiving end restores the original signal by comparing the difference of the two signals. The transmission mode has strong anti-interference performance on external interference, because the signals on the two lines are generally affected by the interference possibly received in the transmission process, and the interference signals are eliminated when the differential comparison is carried out at the receiving end.
In addition, in order to solve the signal attenuation problem, a signal amplifier or a repeater can be added in the system for enhancing the signal attenuated in the transmission process, so as to ensure that the audio and video data can be clearly transmitted to a destination. The arrangement of the signal amplifier is of particular importance for high-rise elevators, since the signal needs to remain stable over a long vertical distance.
In order to further improve the intelligent level of the system, a real-time monitoring mechanism can be arranged in the audio/video signal receiving unit, and when the fluctuation of the differential signal is monitored to exceed a preset safety interval, the system can automatically feed back and adjust the output parameters of the amplified signal, so that the dynamic signal quality control is realized. The intelligent self-adaptive adjustment mechanism can maintain the transmission quality of audio and video data in real time in the rapid operation process of the elevator, and ensure that the communication inside the elevator is unobstructed.
The novel system for transmitting the audio and video data in the elevator based on the power transmission line obviously improves the transmission quality of the audio and video data and the overall performance of the system by integrating the shielding cable, adopting a differential signal transmission technology, adding the signal amplifier, realizing intelligent monitoring and adjusting and a series of innovative measures, and effectively overcomes various defects in the prior art.
Disclosure of Invention
The invention provides an elevator inner audio/video data transmission system based on a power transmission line, which solves the electromagnetic interference problem in the elevator inner audio/video data transmission process through a shielding cable and differential signal transmission, solves the signal attenuation and noise interference problem through a signal amplifier and a real-time monitoring mechanism, and ensures stable transmission and high-quality output of signals. .
The technical scheme of the invention is realized as follows: the elevator inner audio and video data transmission system based on the power transmission line comprises a shielding cable arranged in the power transmission line, an audio and video signal receiving unit and an elevator car control board in an elevator car are respectively connected through the shielding cable, the elevator car control board is connected with the elevator car audio and video unit, the elevator car audio and video unit collects audio and video data in the elevator car and then sends the audio and video data into the elevator car control board, the collected audio and video data is sent to the audio and video signal receiving unit through the elevator car control board, and the elevator car control board carries out differential signal transmission through the shielding cable; the elevator car control board receives triggering signals of the signal triggering units after passing through the signal triggering units, amplifies audio and video data through a signal amplifier in the elevator car control board, monitors received differential signals in real time, sets a signal denoising interval, detects differential signal fluctuation intervals, and feeds back amplified signal output parameters to the elevator car control board when monitoring exceeds the set interval.
The prior art generally relies on unshielded conventional power lines for transmission of audio and video data within an elevator, which is susceptible to electromagnetic interference in the special environment of the elevator, resulting in degradation of audio and video signal quality. In addition, existing systems often lack the necessary signal amplification and real-time monitoring functions for signals are easy to attenuate and distort when transmitted long distances in the elevator hoistway, and when encountering interference, the systems are difficult to quickly adapt, which affects the transmission effect.
In the present technique, shielded cables are used as part of the transmission line, which is one major difference from the prior art. The shielding cable is provided with the built-in shielding layer, so that electromagnetic interference in an elevator hoistway can be effectively resisted, and the stability of signals is improved. The shielding design is particularly important in an environment with more electromagnetic interference, and can ensure that audio and video data are clearly transmitted to a receiving unit without noise; the technology adopts a differential signal transmission mode, and the signal stability and anti-interference performance in the transmission process are enhanced by sending two signals with opposite voltages in the transmission mode. When these two opposite signals are compared at the receiving end, the interfering signals from the environment tend to be cancelled, as these interference typically affect both lines simultaneously. This significantly improves the reliability of the signal compared to conventional single-ended signal transmission. The present technique provides signal triggering units within the elevator shaft that activate the signal amplifier as the car passes, providing the necessary enhancement of the signal. Meanwhile, the real-time monitoring function of the audio and video signal receiving unit can detect whether the differential signal exceeds a preset fluctuation interval, and once abnormality is detected, the system can feed back and adjust the output parameters of the amplified signal to realize self-adaptive signal quality control. The intelligent feedback and self-adaptive adjustment mechanism is lacking in the prior art, and can improve the stability and the anti-interference capability of the whole audio and video data transmission system. Compared with the prior art, the technology has the remarkable advantages in improving the stability, reliability and intelligent level of audio and video data transmission in the elevator by integrating the shielded cable, differential signal transmission, signal trigger unit and real-time monitoring and self-adaptive adjusting mechanism. These improvements enable the audio and video data to maintain high quality transmission in complex elevator environments, meeting the high standard requirements of modern elevator systems for communication technology.
As a preferred embodiment, the shielded cable adopts a shielded twisted pair, two copper wires covered by insulation are tightly twisted and are individually wrapped with a shielding layer on the outer layer of each twisted pair, and the shielding layer is wrapped outside the twisted pair wires to shield electromagnetic interference and radio frequency interference.
As a preferred embodiment, the shielding layer covers and wraps the outer layer of the stranded wires by using an aluminum foil or a metal woven net, and the line crosstalk between the two stranded wires is reduced by using the aluminum foil or the metal woven net.
As a preferable implementation mode, the outer shielding layer adopts a metal foil braided shielding layer, a polyvinyl chloride insulating sleeve is sleeved outside the metal foil braided shielding layer, external electromagnetic interference and radio frequency interference are shielded through the metal foil braided shielding layer, and shielding twisted pair wires are insulated and physically protected through polyvinyl chloride.
As a preferred embodiment, the car audio-video unit comprises at least one camera and at least one microphone, which are used for respectively acquiring video and audio data in the car; the camera and the microphone are both connected to the car control board and connected with the shielding cable through the car control board, and the camera and the microphone are used for collecting data and feeding back to the audio/video signal receiving unit through the car control board.
As a preferred embodiment, the signal amplifier is provided with an automatic gain control function, which is used for adjusting the amplification factor according to the intensity of the received differential signal and the feedback data of the car control panel, so as to ensure the transmission quality and the signal stability of the audio/video data.
As a preferred embodiment, the signal triggering unit comprises an infrared sensor or a radio frequency identification device, and when the car passes through, the triggering unit matched with the infrared sensor or the radio frequency identification device in the car receives a triggering signal and sends the signal to and informs the car control board, so that the signal amplification process is started.
After the technical scheme is adopted, the invention has the beneficial effects that: the use of the shielding cable obviously improves the electromagnetic interference resistance of the system, ensures the stability of audio and video data transmission in the elevator, and can maintain good signal quality even in an elevator shaft with more electromagnetic interference. The introduction of differential signal transmission further improves the stability of the signal, reduces the attenuation and noise of the signal in the transmission process, and provides a more reliable data transmission mode. By monitoring the signal quality in real time and automatically adjusting the signal amplification parameters when the signal quality is monitored to be reduced, the technology can realize the self-adjustment and optimization of the signal quality, and ensures the definition and accuracy of audio and video data in the transmission process. The technology utilizes the existing power transmission line structure, reduces the need of extra wiring, simplifies the installation process, and reduces the difficulty and cost of system maintenance and updating. The signal triggering unit in the system activates signal amplification when the car passes through, so that the amplification of invalid signals is reduced, energy is saved, and the efficiency of the whole communication system is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of the system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the system for transmitting audio and video data in an elevator based on a power transmission line comprises a shielding cable arranged in the power transmission line, an audio and video signal receiving unit and an elevator car control board in the elevator car are respectively connected through the shielding cable, the elevator car control board is connected with the elevator car audio and video unit, the elevator car audio and video unit collects audio and video data in the elevator car and then transmits the audio and video data to the elevator car control board, the collected audio and video data is transmitted to the audio and video signal receiving unit through the elevator car control board, and the elevator car control board carries out differential signal transmission through the shielding cable; the elevator car control board receives triggering signals of the signal triggering units after passing through the signal triggering units, amplifies audio and video data through a signal amplifier in the elevator car control board, monitors received differential signals in real time, sets a signal denoising interval, detects differential signal fluctuation intervals, and feeds back amplified signal output parameters to the elevator car control board when monitoring exceeds the set interval.
The working principle of the system is mainly based on transmission lines for transmitting audio and video data. First, an audio/video signal receiving unit is connected to a car control board in an elevator car by providing a shielded cable in a power line. The car control board is connected with the car audio and video unit, and the car audio and video unit is responsible for gathering the audio and video data in the car to send these data to in the car control board. And then, the acquired audio and video data are sent to the audio and video signal receiving unit through the car control panel, and the data are transmitted in a differential signal mode through the shielded cable. In the actual workflow, the audio and video signal receiving units are arranged at the top or bottom of the elevator shaft, and a plurality of signal triggering units are vertically arranged in the elevator shaft at intervals. After the car passes through the signal triggering unit, the car control board receives the triggering signal of the signal triggering unit, and the audio and video data are amplified through a signal amplifier in the car control board. The audio and video signal receiving unit monitors the received differential signals in real time, sets a signal denoising interval and detects the fluctuation interval of the differential signals. If the monitored fluctuation exceeds the set interval, the audio/video signal receiving unit feeds back to the car control panel to adjust the amplified signal output parameters. Compared with the prior art, the system has the advantages that by using the shielded cable and differential signal transmission, signal interference can be effectively reduced, and the transmission quality of audio and video data is improved. Meanwhile, by setting the signal triggering unit and monitoring the differential signals in real time, the real-time monitoring of the audio and video data can be realized, and the possible problems can be found and processed in time. In addition, through setting up the signal denoising interval, can further improve audio and video data's transmission quality, improve the operational safety and the passenger's of elevator and take experience.
The shielding cable adopts a shielding twisted pair, two copper wires covered by insulation are tightly twisted and are individually wrapped with a shielding layer on the outer layer of each twisted pair, and the outer layer of each twisted pair is wrapped with an outer shielding layer to shield electromagnetic interference and radio frequency interference. Compared with the prior art, the shielding twisted pair design adopted by the system is more unique and efficient. In traditional cable design, only one layer of insulation cover is usually adopted, and the system closely twists two copper wires covered by insulation and individually wraps a shielding layer on the outer layer of each stranded wire, so that signal interference can be effectively prevented, and the stability of signal transmission can be improved. In addition, the system is wrapped with the outer shielding layer after the twisted pair wires, and the design can shield electromagnetic interference and radio frequency interference, so that the quality and stability of signal transmission are further improved. Such designs are not common in the prior art, and therefore the present system has significant advantages in terms of signal transmission quality and stability.
The shielding layer adopts an aluminum foil or a metal woven net to cover and wrap the outer layer of the stranded wires, and the line crosstalk between the two stranded wires is reduced through the aluminum foil or the metal woven net. Conventional cable designs often do not have a specialized shield or the shield material is not ideal and does not effectively reduce crosstalk between the lines. However, the system adopts the aluminum foil or the metal woven mesh to cover and wrap the outer layer of the stranded wires as a shielding layer, and the design can effectively reduce the line crosstalk between the two stranded wires and improve the quality and stability of signal transmission. The aluminum foil or the metal woven mesh is used, so that the shielding layer has better conductivity and shielding effect, and has remarkable advantages in the aspects of reducing line crosstalk and improving signal quality compared with the prior art.
The outer shielding layer adopts a metal foil braided shielding layer, a polyvinyl chloride insulating sleeve is sleeved outside the metal foil braided shielding layer, external electromagnetic interference and radio frequency interference are shielded through the metal foil braided shielding layer, and shielding twisted pair wires are insulated and physically protected through polyvinyl chloride. Compared with the prior art, the system has more innovation and practicability in the design of the outer shielding layer. In conventional cable designs, there is often no specialized outer shielding layer, or the outer shielding layer material and design is not effective in shielding external electromagnetic and radio frequency interference. However, the system adopts the metal foil woven shielding layer as the outer shielding layer, and the design can effectively shield external electromagnetic interference and radio frequency interference and improve the quality and stability of signal transmission. In addition, the system is sleeved with the polyvinyl chloride insulating sleeve outside the metal foil braided shielding layer, and the design can insulate the shielding twisted pair and also can physically protect the shielding twisted pair, so that signal transmission is prevented from being influenced by external force damage. Such designs are not common in the prior art, and therefore the present system has significant advantages in terms of signal transmission quality, stability, and durability of the cable.
The car audio and video unit comprises at least one camera and at least one microphone and is used for respectively acquiring video and audio data in the car; the camera and the microphone are both connected to the car control board and connected with the shielding cable through the car control board, and the camera and the microphone are used for collecting data and feeding back to the audio/video signal receiving unit through the car control board. In conventional elevator systems there is typically only one camera or microphone and these devices are typically connected directly to the main control system of the elevator, not through the car control panel. However, the car audio-video unit of the system comprises at least one camera and at least one microphone, and the equipment is connected to the car control board and is connected with the shielding cable through the car control board, so that the acquisition quality and the transmission efficiency of audio-video data can be effectively improved through the design. In addition, the data collected by the camera and the microphone are fed back to the audio and video signal receiving unit through the car control board, so that the real-time monitoring of the situation in the car can be realized, and the running safety of the elevator is improved. This design is not common in the prior art, and therefore, the system has significant advantages in terms of audio and video data acquisition and transmission, and elevator operation safety.
The signal amplifier is provided with an automatic gain control function and is used for adjusting the amplification factor according to the intensity of the received differential signal and the feedback data of the car control panel, so as to ensure the transmission quality and the signal stability of the audio and video data. In conventional cable transmission in an elevator shaft, the signal amplifier usually has only a fixed amplification factor, and cannot be dynamically adjusted according to the received signal strength and feedback data, which may cause the signal to be too strong or weak, and affect the transmission quality and signal stability of the audio/video data. However, the signal amplifier of the system is provided with an automatic gain control function, the amplification factor can be dynamically adjusted according to the intensity of the received differential signal and the feedback data of the car control panel, and the design can effectively ensure the transmission quality and the signal stability of the audio and video data. This design is not common in the prior art, and therefore the system has significant advantages in terms of signal amplification and adjustment, audio-video data transmission quality and stability.
The signal triggering unit comprises an infrared sensor or a radio frequency identification device, and when the car passes through, the triggering unit matched with the infrared sensor or the radio frequency identification device in the car receives a triggering signal and sends the signal to and informs the car control board, so that the signal amplifying process is started. In the current elevator system, a special signal triggering unit is not usually provided, or the design and the function of the signal triggering unit are simpler, and accurate and real-time signal triggering cannot be realized. However, the signal triggering unit of the present system includes an infrared sensor or a radio frequency identification device, which can receive a triggering signal when the car passes and transmit and notify the car control board, thereby starting the signal amplification process. The design can realize accurate monitoring of the position of the car, timely start signal amplification and improve the transmission quality and stability of audio and video data. In addition, by using an infrared sensor or a radio frequency identification device, the non-contact signal triggering can be realized, and the service life and the reliability of the system are improved. This design is not common in the prior art, and therefore the system has significant advantages in terms of signal triggering and amplification, audio-video data transmission quality and stability, system life and reliability.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The elevator inner audio and video data transmission system based on the power transmission line is characterized by comprising a shielding cable arranged in the power transmission line, an audio and video signal receiving unit and an elevator car control board in an elevator car are respectively connected through the shielding cable, the elevator car control board is connected with the elevator car audio and video unit, the elevator car audio and video unit collects audio and video data in the elevator car and then sends the audio and video data to the elevator car control board, the collected audio and video data is sent to the audio and video signal receiving unit through the elevator car control board, and the elevator car control board carries out differential signal transmission through the shielding cable; the elevator car control board receives triggering signals of the signal triggering units after passing through the signal triggering units, amplifies audio and video data through a signal amplifier in the elevator car control board, monitors received differential signals in real time, sets a signal denoising interval, detects differential signal fluctuation intervals, and feeds back amplified signal output parameters to the elevator car control board when monitoring exceeds the set interval.
2. An audio/video data transmission system in an elevator based on a power line as claimed in claim 1, wherein: the shielding cable adopts a shielding twisted pair, two copper wires covered by insulation are tightly twisted and are individually wrapped with a shielding layer on the outer layer of each twisted pair, and the outer layer of each twisted pair is wrapped with an outer shielding layer to shield electromagnetic interference and radio frequency interference.
3. An audio/video data transmission system in an elevator based on a power line as claimed in claim 2, wherein: the shielding layer adopts an aluminum foil or a metal woven net to cover and wrap the outer layer of the stranded wires, and the line crosstalk between the two stranded wires is reduced through the aluminum foil or the metal woven net.
4. A transmission line-based audio/video data transmission system in an elevator as claimed in claim 3, wherein: the outer shielding layer adopts a metal foil braided shielding layer, a polyvinyl chloride insulating sleeve is sleeved outside the metal foil braided shielding layer, external electromagnetic interference and radio frequency interference are shielded through the metal foil braided shielding layer, and shielding twisted pair wires are insulated and physically protected through polyvinyl chloride.
5. An audio/video data transmission system in an elevator based on a power line as claimed in claim 1, wherein: the car audio and video unit comprises at least one camera and at least one microphone and is used for respectively acquiring video and audio data in the car; the camera and the microphone are both connected to the car control board and connected with the shielding cable through the car control board, and the camera and the microphone are used for collecting data and feeding back to the audio/video signal receiving unit through the car control board.
6. An audio/video data transmission system in an elevator based on a power line as claimed in claim 1, wherein: the signal amplifier is provided with an automatic gain control function and is used for adjusting the amplification factor according to the intensity of the received differential signal and the feedback data of the car control panel, so as to ensure the transmission quality and the signal stability of the audio and video data.
7. An audio/video data transmission system in an elevator based on a power line as claimed in claim 1, wherein: the signal triggering unit comprises an infrared sensor or a radio frequency identification device, and when the car passes through, the triggering unit matched with the infrared sensor or the radio frequency identification device in the car receives a triggering signal and sends the signal to and informs the car control board, so that the signal amplifying process is started.
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| CN202410480402.XA CN118075415B (en) | 2024-04-22 | 2024-04-22 | Audio and video data transmission system in elevator based on power transmission line |
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- 2024-04-22 CN CN202410480402.XA patent/CN118075415B/en active Active
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| JP2010275095A (en) * | 2009-06-01 | 2010-12-09 | Mitsubishi Electric Corp | In-car security camera device for elevator |
| CN106210671A (en) * | 2016-09-13 | 2016-12-07 | 成都创慧科达科技有限公司 | A kind of lift car video signal transmission system and method |
| CN206610655U (en) * | 2017-02-21 | 2017-11-03 | 江苏天诚智能集团有限公司 | Mobile monitor built in elevator and conversational system cable |
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