JP2005035738A - Information transmitting method of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information transmitting method for an elevator capable of constructing a good data transmitting environment between an elevator car and its outside without being restricted by the existing condition of the equipment. <P>SOLUTION: An information transmitting device 5 according to the invention is structured so that a talk voice transmission channel 4a of an intercom tying the car 1 with the outside is used as a transmission channel and a high frequency band different from the intercom talk voice band is used as the frequency band of the carrier wave, wherein an inductance component, for example a ferrite core 8, is installed in the neighborhood of a connection part of a master unit 2 of the intercom and the talk voice transmission channel 4a, and also in the neighborhood of a connection part of a slave unit 3 of the intercom and the transmission channel 4a, and the line impedance for the signal input to the master unit 2 and the slave unit 3 is heightened. This prevents the carrier wave from damping and allows accomplishing good data transmission using the transmission channel 4a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elevator information transmission method, and more particularly to an elevator information transmission method for transmitting information such as video, audio, and control data between a passenger car and the outside.

  Conventionally, a pair of information transmission devices installed outside the elevator car and the outside, for example, an elevator machine room, are connected by a tail cord, and the information is provided in the tail cord. There are some which transmit information through a transmission line.

  In addition, an apparatus has been proposed in which video, audio, control data, and the like are converted into optical signals, and information is transmitted by an optical receiver installed in a car and an optical transmitter provided in an elevator hoistway. (For example, refer to Patent Document 1).

Further, there has been proposed an apparatus that converts video, audio, control data, and the like into radio signals and transmits information via an antenna installed in a car and an antenna installed in a hoistway. (For example, refer to Patent Document 2).
JP 2000-335840 A (paragraph number 0020-0031, FIG. 1) JP 2001-341951 A (paragraph numbers 0017-0051, FIG. 1)

  By the way, in the case of using the above-described conventional tail cord, when an information transmission function such as video, audio and control data is newly added to an existing elevator, it is checked whether or not an empty transmission line remains in the tail cord. In addition to this, there is a problem that additional equipment is required when there is no available transmission line. In addition, in the case of high-rise buildings, if a new tail cord is added, the total weight of the tail cord becomes heavy, so there is a problem that the capacity of the existing hoisting machine becomes insufficient and cannot be handled. It was.

  Further, in the conventional one that converts data into an optical signal, the difficulty of adjusting the optical axis of the optical transmitter increases as the elevator hoistway stroke becomes longer. For this reason, an apparatus for adjusting the optical axis has been invented, but there is a problem that costs are involved. In addition, if the lens surfaces of the optical transmitter and the optical receiver are contaminated with dust, the transmission energy of the optical signal is reduced and communication becomes impossible. Therefore, there is a problem that the lens surface needs to be periodically cleaned.

  Furthermore, conventional data conversion into radio signals cannot be said to be sufficient as a means of defense against jamming radio waves such as interference with other radio waves or illegal radio waves that emit strong radio waves, and communication reliability is lacking. There was a problem.

  In addition, the intercom call audio that connects the elevator car and the outside by synthesizing video, audio, control data, etc., with a carrier wave in a high frequency band different from the interphone audio band to create a high frequency band that does not affect the interphone audio band. Although some transmission lines are used as data transmission lines, there is a problem that the line impedance of the interphone is low, and a high-frequency signal that modulates video, audio, control data, and the like is attenuated.

  The present invention has been made in view of such a situation in the prior art, and its purpose is not to be limited to the existing state, but to construct a good data transmission environment between the car and the outside. It is to provide an elevator information transmission method.

  In order to achieve this object, the present invention provides a transmitter having modulation means for digitally modulating digital data, and a signal combining means for multiplexing a carrier wave on the output of the modulation means and sending it to a transmission line, and the transmission A pair of information transmission devices having a signal separation unit that separates a modulation signal from a carrier wave received via a channel, and a reception unit that includes a demodulation unit that demodulates digital data from the modulation signal output from the signal separation unit. In the elevator information transmission method in which the intercom call voice transmission path connecting the passenger car and the outside is used as the transmission path, and the high frequency band different from the interphone call voice band is used as the frequency band of the carrier wave, Near the connection between the interphone master unit and the call voice transmission path, and the interphone slave unit and the call voice transmission The connecting part is disposed an inductance component in each neighborhood, it is increasing the line impedance for the signal input to the base unit and the handset.

  According to the present invention, the transmitting side digitally modulates digital data such as video, audio and control data by the modulating means, multiplexes the carrier wave by the signal synthesizing means, and then intercom calls connecting the car and the outside. Send to voice transmission path. On the other hand, the receiving side separates the modulated signal from the carrier wave received via the call voice transmission path by the signal separating means, and demodulates digital data such as video, audio and control data from the modulated signal by the demodulating means. The carrier wave set in a high frequency band different from the intercom call voice band is caused by inductance components arranged in the vicinity of the connection part between the master unit and the call voice transmission path and in the vicinity of the connection part between the slave unit and the call voice transmission path. The line impedance with respect to the signal input to the master unit and the slave unit is increased, and accordingly, the carrier wave is prevented from being attenuated, and good data transmission can be realized. Therefore, the call voice transmission path of the interphone normally provided in the elevator can be used as a transmission path for transmitting other data in a favorable environment.

  According to the present invention, since the line impedance for the signal input to the interphone main unit and the sub unit is increased and the carrier wave is prevented from being attenuated, other data is transmitted to the intercom call voice transmission path normally provided in the elevator. It can be set as the transmission line for transmitting in a favorable environment. Thereby, in particular, it becomes possible to easily construct a digital network in an existing elevator.

  Embodiments of an elevator information transmission method according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram showing an embodiment of an elevator information transmission method, FIG. 2 is an overall configuration diagram showing an elevator to which the information transmission method of FIG. 1 is applied, and FIG. 3 is a configuration of an information transmission device provided in the elevator. FIG. 4 is an explanatory diagram showing the frequency band and spectrum of the call voice transmission path.

  As shown in FIG. 2, the elevator includes an elevator car 1, an interphone master unit 2 provided outside, for example, a machine room, an interphone slave unit 3 provided in the elevator car 1, and the elevator car 1 and the outside. An electric transmission line extending between them and connecting the parent device 2 and the child device 3, that is, a tail cord 4 having a call voice transmission path 4a is provided.

  Further, as shown in FIG. 3, a pair of information transmission devices 5 connected to the call voice transmission path 4a near the base unit 2 and the other to the call voice transmission path 4a near the handset 3 are, for example, video, audio and A modulation unit 6a that performs digital modulation on the digital data of the control data to form multi-level QAM, and a transmission unit 6 that includes a signal synthesis unit 6b that multiplexes a carrier wave to the output of the modulation unit 6a and sends it to the transmission line; A receiving unit 7 including a signal separating unit 7a for separating a modulated signal from a carrier wave received via the call voice transmission path 4a, and a demodulating unit 7b for demodulating digital data from the modulated signal output from the signal separating unit 7a; It has the coupling | bond part 9 which couple | bonds the transmission part 6 and the receiving part 7, and the telephone call transmission path 4a, and the transmitter 10 connected to the transmission part 6 and the receiving part 7. FIG.

  As shown in FIG. 1, the interphone master unit 2 and the slave unit 3 are connected to each other by two call voice transmission paths 4a provided in the tail cord 4, and the master unit 2 and the call voice are connected to each other. An inductance component, for example, a ferrite core 8 is disposed in the vicinity of the connection portion of the transmission line 4a and in the vicinity of the connection portion of the handset 3 and the voice communication line 4a, and the line impedance for the signal input to the base unit 2 and the handset 3 Is supposed to be high. The reciprocating call voice transmission path 4a is wound around the ferrite core 8, but the winding direction of one call voice transmission path 4a and the winding direction of the other call voice transmission path 4a are reversed. It is good to make it. That is, the normal mode impedance is increased rather than the common mode impedance is increased. As a result, the line impedance from the information transmission device 5 to the master unit 2 and the line impedance from the information transmission device 5 to the slave unit 3 are increased, and the attenuation of the signal voltage level transmitted and received between the information transmission devices 5 is reduced. And good transmission is possible.

  In this embodiment, for example, when control data is transmitted from an external device (not shown) installed in the machine room to an internal device of the car 1, the modulation means 6a of the information transmission device 5 of the machine room 1 is used. The control data is digitally modulated into multi-level QAM, for example, 64-level QAM, and a carrier wave having a high frequency of several MHz is multiplexed on this by the signal synthesizing unit 6b, and sent to the voice communication line 4a via the coupling unit 9 To do. On the other hand, when the information transmission device 5 of the car 1 on the receiving side receives the carrier wave via the coupling unit 9, the signal separating unit 7a separates the modulated signal from the carrier wave, and the demodulating unit 7b controls the modulated signal from the modulated signal. Data is demodulated and this control data is sent to the internal equipment of the car 1. Although the case where control data is transmitted from an external device (not shown) installed in the machine room to the internal device of the car 1 has been described here, the reverse, that is, the internal device of the car 1 is installed in the machine room. It goes without saying that the same processing is performed when data is transmitted to an external device (not shown).

  Here, each frequency band and spectrum on the call voice transmission path 4a when data is transmitted by the pair of information transmission devices 5 during a call between the parent device 2 and the child device 3 will be described with reference to FIG. As shown in FIG. 4, the call voice band between the parent device 2 and the child device 3 is generally several hundred Hz to several kHz, and the frequency band of the carrier wave of the information transmission apparatus 5 of the present embodiment is set to several MHz. Thus, data transmission is performed without interfering with each other.

  In the embodiment configured as described above, the line impedance for the signal input to the base unit 2 and the handset 3 of the interphone is increased to prevent the carrier wave from being attenuated. 4a can be used as a transmission path for transmitting other data in a favorable environment.

  5 and 6 are explanatory diagrams showing fractional bands and spectrums of a carrier wave transmitted by another method.

  In the above-described embodiment, the carrier wave uses one frequency as shown in FIG. 4, but the present invention is not limited to this, and separate frequencies are used on the transmission side and the reception side as shown in FIG. Can also be used. Further, as shown in FIG. 6, a plurality of carriers can be used by a method called OFDM (Orthogonal Frequency Division Multiplexing).

It is a block diagram which shows one Embodiment of the information transmission method of an elevator. It is a whole block diagram which shows the elevator with which the information transmission method of FIG. 1 is applied. It is a block diagram which shows the structure of the information transmission apparatus with which an elevator is equipped. It is explanatory drawing which shows the fractional band and spectrum of a call voice transmission path. It is explanatory drawing which shows the fractional band and spectrum of the carrier wave transmitted with the other method. It is explanatory drawing which shows the fractional band and spectrum of the carrier wave transmitted with the other method.

Explanation of symbols

1 Car 2 Parent machine (intercom)
3 cordless handset (intercom)
4 Tail code 4a Call voice transmission path 5 Information transmission device 6 Transmitter 6a Modulator 6b Signal combiner 7 Receiver 7a Signal separator 7b Demodulator 8 Ferrite core (inductance component)

Claims (2)

Modulation means for performing digital modulation on digital data, and a transmission unit comprising signal combining means for multiplexing a carrier wave on the output of the modulation means and sending it to a transmission line, and a modulation signal from the carrier wave received via the transmission line A pair of information transmission devices having a signal separating means for separating, and a receiving section provided with a demodulating means for demodulating digital data from the modulation signal output from the signal separating means, wherein the intercom connecting the car and the outside In an elevator information transmission method in which a call voice transmission path is used as the transmission path and a high frequency band different from an intercom call voice band is used as the frequency band of the carrier wave,
An inductance component is arranged in the vicinity of the connection portion between the interphone main unit and the call voice transmission path, and in the vicinity of the connection portion between the interphone slave unit and the call voice transmission path, and An elevator information transmission method comprising increasing line impedance with respect to a signal input. 2. The elevator information transmission method according to claim 1, wherein the inductance component comprises a ferrite core attached to the call voice transmission path.

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