KR20150015777A - Image system for elevator - Google Patents

Image system for elevator Download PDF

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Publication number
KR20150015777A
KR20150015777A KR1020130091593A KR20130091593A KR20150015777A KR 20150015777 A KR20150015777 A KR 20150015777A KR 1020130091593 A KR1020130091593 A KR 1020130091593A KR 20130091593 A KR20130091593 A KR 20130091593A KR 20150015777 A KR20150015777 A KR 20150015777A
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KR
South Korea
Prior art keywords
wireless transceiver
signal
video signal
elevator
unit
Prior art date
Application number
KR1020130091593A
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Korean (ko)
Inventor
이훈희
서석장
정원석
Original Assignee
옵티시스 주식회사
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Priority to KR1020130091593A priority Critical patent/KR20150015777A/en
Publication of KR20150015777A publication Critical patent/KR20150015777A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
    • B66B3/002—Indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H04N21/43635—HDMI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)

Abstract

The purpose of the present invention is to provide an imaging system for an elevator, which is capable of solving the fundamental problem that a communication error occurs frequently due to damage to cables or the like in an imaging system for an elevator using wired communications. An imaging system for an elevator is provided. The imaging system includes first to fourth wireless transceivers. The first wireless transceiver is installed as a wireless communication interface of a controller on an upper outer surface of the elevator. The second wireless transceiver is installed as a wireless communication interface of the controller on a lower outer surface of the elevator. The third wireless transceiver is installed as a wireless communication interface of a host device on the ceiling of a moving area of the elevator to communicate with the first wireless transceiver. The fourth wireless transceiver is installed as a wireless communication interface of the host device on the bottom of the moving area of the elevator to communicate with the second wireless transceiver.

Description

[0001] Image system for elevator [0002]

The present invention relates to a video system for an elevator, and more particularly, to a video system for an elevator, in which a display device and a camera are installed in an elevator to transmit a first video signal from the camera to a host device, And transmits the signal to the display device.

Here, the video signal is generally used as a concept including a video signal and a voice signal. Therefore, in the following, a description of the audio signal dependent on the video signal is omitted.

In a typical image system for an elevator, a display device and a camera are installed inside the elevator, and a first video signal from the camera is transmitted to the host device by wire, and a second video signal (for example, Content video signal) to the display device by wire. Here, the host device may be connected to an upper host device via a communication network.

According to the video communication system of the elevator of the wired communication, there is a fundamental problem that frequent communication errors occur due to cable damage or the like due to the characteristics of the elevator.

In order to solve the problem of the wired communication, wireless communication has been introduced. However, due to the characteristics of the elevator, communication disconnection due to electromagnetic wave shielding and the like are becoming fundamental problems.

U.S. Patent No. 6,471,011 (Applicant: Mitsubishi Electric Co., Ltd., entitled Elevator Communication Controller and Communication Control Method).

The embodiments of the present invention are fundamentally problematic in that a communication error frequently occurs due to a cable damage or the like in a video communication system for an elevator of a wired communication and a fundamental problem that communication disconnection frequently occurs due to electromagnetic wave shielding or the like in a wireless video communication system The present invention is to provide a video system for an elevator which can be improved.

A video system for an elevator according to an aspect of the present invention includes a host device, a display device, a camera, a controller, a first wireless transceiver, a second wireless transceiver, a third wireless transceiver, and a fourth wireless transceiver.

The display device and the camera are installed inside the elevator.

The control device is provided in the elevator, and transmits a first video signal from the camera to the host device, receives the second video signal from the host device, and inputs the second video signal to the display device.

The first radio transceiver is installed on the upper outer surface of the elevator as a wireless communication interface of the control device.

The second radio transceiver is installed on a lower outer surface of the elevator as a wireless communication interface of the control device.

The third wireless transceiver is installed in the ceiling of the moving area of the elevator for communication with the first wireless transceiver as a wireless communication interface of the host device.

And the fourth wireless transceiver is installed at the bottom of the moving area of the elevator for communication with the second wireless transceiver as a wireless communication interface of the host device.

Preferably, an ethernet cable, an optical cable, or an HDMI (High Definition Multimedia Interface) cable is connected between the control device and the first wireless transceiver to transmit and receive a video signal.

Also, an ethernet cable, an optical cable, or an HDMI cable is connected between the control device and the second wireless transceiver, and video signals are transmitted and received.

An ethernet cable, an optical cable, or an HDMI cable is connected between the host device and the third wireless transceiver to transmit and receive a video signal.

An ethernet cable, an optical cable, or an HDMI cable is connected between the host device and the fourth wireless transceiver to transmit and receive a video signal.

Preferably, the host apparatus transmits the second video signal to the first wireless transceiver and the second wireless transceiver through the third wireless transceiver and the fourth wireless transceiver, respectively.

Also, the controller may compare the second video signals received through the first wireless transceiver and the second wireless transceiver with each other, and determine a communication state between the first wireless transceiver and the third wireless transceiver, Receiving the second video signal from the wireless transceiver selected as a better communication condition among the first wireless transceiver and the second wireless transceiver into the display device And outputs the first video signal to the selected wireless transceiver.

Preferably, the communication state includes at least one of a Received Signal Strength Indicator (RSSI), a Signal to Noise Ratio (SNR), a Bit Error Ratio (BER), and a Packet Error Ratio ). ≪ / RTI >

Preferably, the control device includes a selection signal transmission / reception unit, a signal detection unit, a signal comparison unit, a control unit, and a video signal input / output unit.

The selection signal transmission / reception unit inputs the second video signals Sr1 and Sr2 received through the first wireless transceiver and the second wireless transceiver to the signal detection unit, and the selection control signal Ssc Receiving the second video signal from the selected radio transceiver to the control unit, and transmitting the first video signal from the control unit to the first wireless transceiver by selecting one of the first wireless transceiver and the second wireless transceiver, To the selected radio transceiver.

The signal detecting unit detects state signals (Sr1a, Sr2a) for obtaining a communication state in each of the second video signals (Sr1, Sr2) from the selection signal transmitting / receiving unit.

Wherein the signal comparator compares a state of communication between the first radio transceiver and the third radio transceiver and a state of communication between the second radio transceiver and the fourth radio transceiver using the state signals Sr1a, Sr2a from the signal detector, And inputs the comparison result signal Scr to the control unit.

Wherein the control unit inputs the first video signal from the video signal input / output unit to the selection signal transmission / reception unit, inputs the second video signal from the selection signal transmission / reception unit to the video signal input / output unit, And inputs the selection control signal Ssc to the selection signal transmission / reception section in accordance with the comparison result signal Scr from the comparison section.

The video signal input / output unit inputs the first video signal from the camera to the control unit, and inputs the second video signal from the control unit to the display device.

Preferably, the selection signal transmission / reception unit includes a first transmission / reception signal input / output unit, a second transmission / reception signal input / output unit, a digital switch, and a data input / output unit.

The first transmission / reception signal input / output unit inputs the second video signal (Sr1) received through the first wireless transceiver to the digital switch and the signal detection unit, and outputs the first video signal To the first wireless transceiver.

The second transmission / reception signal input / output unit inputs the second video signal (Sr2) received through the second wireless transceiver to the digital switch and the signal detection unit, and outputs the first video signal To the second wireless transceiver.

Wherein the digital switch selects one of the first and second transmission / reception signal input / output units from the first transmission / reception signal input / output unit and the second transmission / reception signal input / output unit according to a selection control signal (Ssc) from the control unit, Output unit, and outputs the first video signal from the data input / output unit to the selected transmission / reception signal input / output unit.

The data input / output unit inputs the first video signal from the control unit to the digital switch, and inputs the second video signal from the digital switch to the control unit.

According to an embodiment of the present invention, the controller, the first radio transceiver, and the second radio transceiver move together with the elevator. Also, the third radio transceiver is fixed to the ceiling of the moving area of the elevator, and the fourth radio transceiver is fixed to the bottom of the moving area of the elevator. Therefore, a fundamental problem of frequent communication errors due to cable damage or the like in a video system for an elevator of a wired communication may be improved.

According to an embodiment of the present invention, the first radio transceiver installed on the upper outer surface of the elevator communicates with the third radio transceiver provided on the ceiling of the moving region of the elevator. In addition, the second radio transceiver installed on the lower outer surface of the elevator communicates with the fourth radio transceiver installed on the bottom of the moving area of the elevator.

That is, the wireless communication in the upper space of the moving elevator and the wireless communication in the lower space can be selectively used.

Therefore, a fundamental problem of frequent communication disconnection due to electromagnetic wave shielding or the like in a video system for an elevator of a wireless communication can be improved.

For example, the host device may transmit the second video signal to the first wireless transceiver and the second wireless transceiver through the third wireless transceiver and the fourth wireless transceiver, respectively.

Wherein the control device compares the second video signals received through the first wireless transceiver and the second wireless transceiver with each other to determine a communication state between the first wireless transceiver and the third wireless transceiver, Receiving a second video signal from a wireless transceiver selected as a better communication condition among the first wireless transceiver and the second wireless transceiver to the display device And output the first video signal to the selected wireless transceiver.

1 is a view showing a video system for an elevator according to an embodiment of the present invention.
2 is a view showing a signal flow in the elevator image system of FIG.
FIG. 3 is a view showing the internal configuration of the control device in FIGS. 1 and 2. FIG.
FIG. 4 is a diagram illustrating an internal configuration of the selection signal transmitting / receiving unit in FIG. 3. FIG.
5 is a flowchart illustrating an operation of the controller in FIG.
FIG. 6 is a flowchart illustrating an operation procedure of the host apparatus in FIG. 1;

The following description and accompanying drawings are for understanding the operation according to the present invention, and parts that can be easily implemented by those skilled in the art can be omitted.

Further, the specification and drawings are not provided for the purpose of limiting the present invention, and the scope of the present invention should be determined by the claims. The terms used in the present specification should be construed to mean the meanings and concepts consistent with the technical idea of the present invention in order to best express the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 shows a video system for an elevator according to an embodiment of the present invention. Fig. 2 shows the signal flow in the elevator video system of Fig. In FIGS. 1 and 2, the same reference numerals denote objects having the same function. 2, Srt1 denotes a first transmission / reception signal between the host device 18 and the control device 141, and Srt2 denotes a second transmission / reception signal between the host device 18 and the control device 141, respectively.

1 and 2, an image system for an elevator according to an embodiment of the present invention includes a host device 18, a display device 161, a camera 151, a control device 141, a first wireless transceiver 131, A second wireless transceiver 132, a third wireless transceiver 133, and a fourth wireless transceiver 134. Here, the host device 18 may be connected to the host host apparatus via the communication network 19. [

The display device 161 and the camera 151 are installed inside the elevator 11.

The control device 141 is provided in the elevator 11 and transmits the first video signal Sic from the camera 151 to the host device 18 and the second video signal Sic from the host device 18 Sid), for example, and inputs the content video signal to the display device 161. [

The first wireless transceiver 131 is installed on the upper outer surface of the elevator 11 as a wireless communication interface of the controller 141.

The second wireless transceiver 132 is installed on the lower outer surface of the elevator 11 as a wireless communication interface of the controller 141.

The third wireless transceiver 133 is installed in the ceiling 12u of the moving region of the elevator 11 for communication with the first wireless transceiver 131 as a wireless communication interface of the host device 18. [

And the fourth wireless transceiver 134 is installed at the bottom 121 of the moving area of the elevator 11 for communication with the second wireless transceiver 132 as the wireless communication interface of the host device 18. [

The control device 141, the first wireless transceiver 131, and the second wireless transceiver 132 move together with the elevator 11. In the elevator image system, The third wireless transceiver 133 is fixed to the ceiling 12u of the moving area of the elevator 11 and the fourth wireless transceiver 134 is fixed to the bottom 121 of the moving area of the elevator 11. [ Therefore, a fundamental problem of frequent communication errors due to cable damage or the like in a video system for an elevator of a wired communication may be improved.

The first wireless transceiver 131 installed on the upper surface of the elevator 11 is connected to the third wireless transceiver 133 installed on the ceiling 12u of the moving region of the elevator 11, Lt; / RTI > The second wireless transceiver 132 provided on the lower outer surface of the elevator 11 communicates with the fourth wireless transceiver 134 provided on the floor 121 of the moving area of the elevator 11. [

That is, the wireless communication in the upper space of the moving elevator 11 and the wireless communication in the lower space can be selectively used.

Therefore, a fundamental problem of frequent communication disconnection due to electromagnetic wave shielding or the like in a video system for an elevator of a wireless communication can be improved.

An Ethernet cable or an optical cable is connected or a HDMI (High Definition Multimedia Interface) cable is connected between the controller 141 and the first wireless transceiver 131 to transmit and receive a video signal .

An ethernet cable, an optical cable, or an HDMI cable is connected between the controller 141 and the second wireless transceiver 132 to transmit and receive a video signal.

An ethernet cable, an optical cable, or an HDMI cable is connected between the host device 18 and the third wireless transceiver 133 to transmit and receive a video signal.

An ethernet cable, an optical cable, or an HDMI cable is connected between the host device 18 and the fourth wireless transceiver 134 to transmit and receive a video signal.

Here, the host apparatus 18 transmits the second video signal to the first wireless transceiver 131 and the second wireless transceiver 132 via the third wireless transceiver 133 and the fourth wireless transceiver 134, respectively do.

The control device 141 compares the second video signals received through the first wireless transceiver 131 and the second wireless transceiver 132 with each other and transmits the second video signals to the first wireless transceiver 131 and the third wireless transceiver 133 And a communication state between the second wireless transceiver 132 and the fourth wireless transceiver 134 and determines the communication state between the first wireless transceiver 131 and the second wireless transceiver 132 as a better communication state Inputs the second video signal from the wireless transceiver to the display device 161, and outputs the first video signal to the selected wireless transceiver.

Here, the communication state includes a received signal strength indicator (RSSI), a signal to noise ratio (SNR), a bit error ratio (BER), and a packet error ratio (PER) And the like.

Fig. 3 shows the internal configuration of the control device 141 in Figs. 1 and 2. Fig. In Fig. 3, the same reference numerals as those in Fig. 2 denote objects having the same function. 3, reference numeral Scd denotes a transmission / reception signal between the video signal input / output unit 302 and the control unit 301, Srt denotes a transmission / reception signal between the control unit 301 and the selection signal transmission / reception unit 303, Srt1 denotes a selection signal transmission / 1 and 2), and Srt2 denotes a transmission / reception signal between the selection signal transmission / reception unit 303 and the second radio transceiver (132 in FIGS. 1 and 2), and Srt2 denotes a transmission / reception signal between the transmission / reception unit 303 and the first radio transceiver Respectively.

The internal configuration of the control device 141 will be described with reference to FIGS. 2 and 3. FIG.

The control device 141 includes a selection signal transmission / reception unit 303, a signal detection unit 304, a signal comparison unit 305, a control unit 301, and a video signal input / output unit 302.

The selection signal transmission and reception unit 303 inputs the second video signals Sr1 and Sr2 respectively received through the first wireless transceiver 131 and the second wireless transceiver 132 to the signal detection unit 304. [

The selection signal transmitting and receiving section 303 selects either one of the first radio transceiver 131 and the second radio transceiver 132 according to the selection control signal Ssc from the control section 301 and selects (Sr1 or Sr2) from the wireless transceiver to the control unit 301 and outputs the first video signal from the control unit 301 to the selected wireless transceiver.

The signal detection unit 304 detects state signals Sr1a and Sr2a for obtaining the communication state in each of the second video signals Sr1 and Sr2 from the selection signal transmission and reception unit 303. [

The signal comparator 305 uses the state signals Sr1a and Sr2a from the signal detector 304 to determine the communication state between the first radio transceiver 131 and the third radio transceiver 133, Compares the communication states between the wireless transceiver 132 and the fourth wireless transceiver 134 and inputs the comparison result signal Scr to the controller 301. [

The signal comparator 305 compares the received signal strength indicator (RSSI), the signal-to-noise ratio (SNR), the bit error rate (BER) : Bit Error Ratio) and a packet error ratio (PER: Packet Error Ratio).

The control unit 301 inputs the first video signal from the video signal input / output unit 302 to the selection signal transmission / reception unit 303 and outputs the second video signal from the selection signal transmission / reception unit 303 to the video signal input / 302).

The control unit 301 also inputs the selection control signal Ssc to the selection signal transmission / reception unit 303 in accordance with the comparison result signal Scr from the signal comparison unit 305. [

The video signal input / output unit 302 inputs the first video signal Sic from the camera 151 to the control unit 301 and outputs the second video signal Sid from the control unit 301 to the display device 161 ).

FIG. 4 shows an internal configuration of the selection signal transmission / reception unit 303 in FIG. In Fig. 4, the same reference numerals as those in Figs. 2 and 3 denote objects having the same function. The internal configuration of the selection signal transmission / reception unit 303 will be described with reference to FIGS. 2 to 4. FIG.

The selection signal transmission / reception unit 303 includes a first transmission / reception signal input / output unit 403a, a second transmission / reception signal input / output unit 403b, a digital switch 401, and a data input / output unit 402.

The first transmission / reception signal input / output unit 403a inputs the second video signal Sr1 received through the first wireless transceiver 131 to the digital switch 401 and the signal detection unit 304, respectively.

Also, the first transmission / reception signal input / output unit 403a outputs the first video signal from the digital switch 401 to the first wireless transceiver 131. [

The second transmission / reception signal input / output unit 403b inputs the second video signal Sr2 received through the second wireless transceiver 132 to the digital switch 401 and the signal detection unit 304, respectively.

Further, the second transmission / reception signal input / output unit 403b outputs the first video signal from the digital switch 401 to the second wireless transceiver 132. [

The digital switch 401 selects one of the first transmission / reception signal input / output unit 403a and the second transmission / reception signal input / output unit 403b in accordance with the selection control signal Ssc from the control unit 301. [

The digital switch 401 inputs the second video signal from the selected transmission / reception signal input / output section 403a or 403b to the data input / output section 402 and outputs the first video signal from the data input / To the selected transmission / reception signal input / output unit 403a or 403b.

The data input / output unit 402 inputs the first video signal from the control unit 301 to the digital switch 401 and inputs the second video signal from the digital switch 401 to the control unit 301. [

FIG. 5 shows the operation of the control unit 301 in FIG. The operation of the controller 301 will be described with reference to FIGS. 3 and 5. FIG.

The control unit 301 inputs the selection control signal Ssc to the selection signal transmission / reception unit 303 in accordance with the comparison result signal Scr from the signal comparison unit 305 in step S501.

After the execution of step S501, if the first video signal is input from the video signal input / output unit 302 (step S502a), the control unit 301 determines whether or not compression is set (step S502b). If compression is set, the control unit 301 compresses the input first video signal (step S502c). Next, the control unit 301 outputs the compressed or uncompressed input first video signal to the selection signal transmission / reception unit 303 (step S502d).

Conversely, if the second video signal has been input from the selection signal transmitting / receiving unit 303 after the execution of step S501 (step S503a), the control unit 301 determines whether restoration is set (step S503b). If the restoration is set, the control unit 301 performs restoration on the compressed input second video signal (step S503c). Next, the control unit 301 outputs the input second video signal to the video signal input / output unit 302 (step S503d).

All the above steps are repeatedly performed until a termination signal is generated (step S504).

Figure 6 shows the operation of the host device 18 in Figures 1 and 2. The operation of the host device 18 will now be described with reference to FIGS. 1, 2 and 6. FIG.

In step S61, the host device 18 determines which of the third wireless transceiver 133 and the fourth wireless transceiver 134 is the wireless transceiver to input the first video signal (step S61).

When the third wireless transceiver 133 inputs the first video signal, the host apparatus 18 processes the first video signal from the third wireless transceiver 133 and outputs the second video signal to the third and fourth To the wireless transceivers 133 and 134 (step S63).

When the fourth wireless transceiver 134 inputs the first video signal, the host device 18 processes the first video signal from the fourth wireless transceiver 134 and outputs the second video signal to the third and fourth To the wireless transceivers 133 and 134 (step S65).

All the above steps are repeatedly performed until a termination signal is generated (step S67).

As described above, according to the embodiment of the present invention, the control device, the first radio transceiver and the second radio transceiver move together with the elevator. Also, the third radio transceiver is fixed to the ceiling of the moving area of the elevator, and the fourth radio transceiver is fixed to the bottom of the moving area of the elevator. Therefore, a fundamental problem of frequent communication errors due to cable damage or the like in a video system for an elevator of a wired communication may be improved.

Meanwhile, according to the embodiment of the present invention, the first radio transceiver provided on the upper outer surface of the elevator communicates with the third radio transceiver provided on the ceiling of the moving region of the elevator. The second radio transceiver installed on the lower outer surface of the elevator also communicates with the fourth radio transceiver installed on the bottom of the moving area of the elevator.

That is, the wireless communication in the upper space of the moving elevator and the wireless communication in the lower space can be selectively used.

Therefore, a fundamental problem of frequent communication disconnection due to electromagnetic wave shielding or the like in a video system for an elevator of a wireless communication can be improved.

For example, the host device may transmit the second video signal to the first wireless transceiver and the second wireless transceiver, respectively, via the third wireless transceiver and the fourth wireless transceiver.

Here, the control device compares the second video signals received via the first wireless transceiver and the second wireless transceiver with each other to determine a communication state between the first wireless transceiver and the third wireless transceiver, and a communication state between the second wireless transceiver and the second wireless transceiver, Receiving a second video signal from a wireless transceiver selected as a better communication condition among the first wireless transceiver and the second wireless transceiver into the display device and transmitting the first video signal to the selected wireless transceiver .

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments should be considered in a descriptive sense rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and the inventions claimed by the claims and the inventions equivalent to the claimed invention are to be construed as being included in the present invention.

There is a possibility of being used also in reciprocating devices.

11: elevator, 12u: ceiling of moving area of elevator,
12l: floor of the moving area of the elevator, 131: first radio transceiver,
132: second wireless transceiver, 133: third wireless transceiver,
134: fourth wireless transceiver, 141; controller,
151: camera, 161: display device,
18: host device, 19; communications network,
301: control unit, 302: video signal input / output unit,
303: selection signal transmission / reception unit, 304: signal detection unit,
Sr1, Sr2: second image signals, Sr1a, Sr2a: status signals,
Scr: comparison result signal, Ssc: selection control signal,
305: signal comparing unit, 401: digital switch,
402: Data input / output unit, 403a: First transmission / reception signal input / output unit,
403b: second transmission / reception signal input / output section.

Claims (6)

A host device;
A display device and a camera installed inside the elevator;
A control device installed in the elevator for transmitting a first video signal from the camera to the host device and receiving a second video signal from the host device and inputting the second video signal to the display device;
A first wireless transceiver provided on an upper outer surface of the elevator as a wireless communication interface of the control device;
A second wireless transceiver provided on a lower outer surface of the elevator as a wireless communication interface of the control device;
A third wireless transceiver installed on a ceiling of a moving region of the elevator for communicating with the first wireless transceiver as a wireless communication interface of the host device; And
And a fourth wireless transceiver installed at the bottom of the moving area of the elevator for communication with the second wireless transceiver as a wireless communication interface of the host device. The method according to claim 1,
An ethernet cable, an optical cable, or an HDMI cable is connected between the control device and the first wireless transceiver to transmit / receive a video signal,
An ethernet cable, an optical cable, or an HDMI cable is connected between the controller and the second wireless transceiver to transmit and receive a video signal,
An ethernet cable, an optical cable, or an HDMI cable is connected between the host device and the third wireless transceiver to transmit / receive a video signal,
Wherein an Ethernet cable, an optical cable, or an HDMI cable is connected between the host device and the fourth wireless transceiver, and a video signal is transmitted and received. The method according to claim 1,
Wherein the host apparatus transmits the second video signal to the first wireless transceiver and the second wireless transceiver through the third wireless transceiver and the fourth wireless transceiver,
The control device includes:
A first wireless transceiver and a second wireless transceiver, wherein the first wireless transceiver and the second wireless transceiver are configured to compare the second video signals respectively received through the first wireless transceiver and the second wireless transceiver with each other to determine a communication state between the first wireless transceiver and the third wireless transceiver, 4 wireless transceiver and inputs the second video signal from the selected wireless transceiver as a better communication condition among the first wireless transceiver and the second wireless transceiver to the display device, To the selected radio transceiver. The communication system according to claim 3,
Including at least one of a Received Signal Strength Indicator (RSSI), a Signal to Noise Ratio (SNR), a Bit Error Ratio (BER), and a Packet Error Ratio (PER) Image system for elevator. The control apparatus according to claim 1,
A selection signal transmission / reception unit, a signal detection unit, a signal comparison unit, a control unit, and a video signal input / output unit,
The selection signal transmitting /
The first video signal Sr1 and the second video signal Sr2 received through the first wireless transceiver and the second wireless transceiver are input to the signal detector, Receiving the second video signal from the selected wireless transceiver by selecting one of the wireless transceiver and the second wireless transceiver and outputting the first video signal from the controller to the selected wireless transceiver In addition,
Wherein the signal detecting unit comprises:
(Sr1a, Sr2a) for obtaining a communication state is detected in each of the second video signals (Sr1, Sr2) from the selection signal transmitting / receiving unit,
Wherein the signal comparing unit comprises:
A state of communication between the first radio transceiver and the third radio transceiver and a state of communication between the second radio transceiver and the fourth radio transceiver using the state signals Sr1a and Sr2a from the signal detector, Compares them, inputs a comparison result signal Scr to the control unit,
Wherein,
The first video signal from the video signal input / output unit is input to the selection signal transmission / reception unit, the second video signal from the selection signal transmission / reception unit is input to the video signal input / output unit, The selection control signal Ssc is input to the selection signal transmission / reception unit according to the comparison result signal Scr,
The video signal input /
Inputting the first video signal from the camera to the control unit and inputting the second video signal from the control unit to the display device. 6. The apparatus of claim 5, wherein the selection signal transmitting /
A first transmission / reception signal input / output unit, a second transmission / reception signal input / output unit, a digital switch, and a data input / output unit,
The first transmission / reception signal input /
Receiving the second video signal (Sr1) received through the first wireless transceiver to the digital switch and the signal detecting unit, and outputting the first video signal from the digital switch to the first wireless transceiver ,
The second transmission / reception signal input /
Receives the second video signal (Sr2) received through the second wireless transceiver to the digital switch and the signal detecting unit, and outputs the first video signal from the digital switch to the second wireless transceiver ,
The digital switch includes:
Output section and the second transmission / reception signal input / output section from among the first transmission / reception signal input / output section and the second transmission / reception signal input / output section according to the selection control signal Ssc from the control section, And outputs the first video signal from the data input / output unit to the selected transmission / reception signal input / output unit,
The data input /
Inputting the first video signal from the control unit to the digital switch and inputting the second video signal from the digital switch to the control unit.
KR1020130091593A 2013-08-01 2013-08-01 Image system for elevator KR20150015777A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017042414A1 (en) * 2015-09-10 2017-03-16 Rec.Videovigilancia, S.L. Video surveillance equipment for elevator cars

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017042414A1 (en) * 2015-09-10 2017-03-16 Rec.Videovigilancia, S.L. Video surveillance equipment for elevator cars

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