Communication system

Abstract

To provide a communication system capable of achieving intercommunication with large altitude difference without exerting an adverse effect on other equipment without arranging a relay system, and efficiently constructing a private communication network with simple work.SOLUTION: A communication system for achieving voice communication between workers with an existing cable rack 1 (a magnetic structure) extending in a height direction at a construction site of a high rise building as a transmission medium comprises: a plurality of communication adapters 4 installed at a plurality of places in a height direction and including a transmission coil 2 and a reception coil 3; and a plurality of headsets 5 undergoing pair connection to each of the communication adapters 4 by radio communication. The communication system generates electromotive force by electromagnetic induction in a reception coil 3 of the other communication adapter 4 through the cable rack 1 by performing frequency modulation of a signal received by a communication adapter 4 of a pairing partner from a certain headset 5 and passing the signal to the transmission coil 2, and performs detection demodulation of the electromotive force and transmits the electromagnetic force to the other headset 5 of the pairing partner.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a communication system used at a construction site of a high-rise building.

Background Art

[0002] In recent years, with large-scale urban redevelopment progressing mainly in the center of Tokyo, the construction of super high-rise buildings has become essential. In the construction of such super high-rise buildings, especially for the high-voltage and low-voltage main line laying in the power receiving and transforming equipment, it is inevitable to lay the main line cables from the underground floor to the above-ground floors, and there are also sites where the cable length exceeds 200 m.

[0003] Conventionally, the communication means during the laying of the main line cables generally mainly uses transceivers. However, for the communication from the underground floor to the above-ground floors within a super high-rise building, when the distance exceeds a certain length, the communication becomes impossible. Therefore, the introduction of a new communication system to replace the conventional communication means using transceivers is required.

[0004] In addition, as prior art document information related to the communication system at the construction site in the past, for example, there is the following Patent Document 1 and the like.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] More specifically, in an actual construction case where it was necessary to lay 297 m of high-voltage cables from the third basement floor to the 48th floor above ground, although business radio was used as the transceiver for the communication means, communication from the basement floors was interrupted above the 25th floor, and it became necessary to arrange relay personnel on the intermediate floors. It was difficult to allocate relay personnel from the limited number of workers, and thus faced this problem.

[0007] On the other hand, if an attempt was made to cope by increasing the output of the transceiver, there was a concern that it would affect the malfunction of other devices. In particular, there was an actual past case of causing a mis-trip regarding the circuit breaker. Therefore, an attempt was also made to carry out the construction by newly preparing a construction pocket communication device as the communication means during the trunk laying. However, since this type of construction pocket communication device uses wired communication, it is necessary to perform the work of laying a wired cable in advance, and as a result, the working range is limited to the vicinity of the wired cable, and there was a problem that the work efficiency was reduced due to these circumstances.

[0008] The present invention has been made in view of the above circumstances, and an object thereof is to provide a communication system that can realize intercommunication with a large height difference without arranging relay personnel, without adversely affecting other devices, and can efficiently construct an in-site communication network with simple work.

Means for Solving the Problems

[0009] The present invention is a communication system that realizes voice communication between workers using an existing magnetic structure extending in the height direction of a high-rise building as a transmission medium at a construction site of the high-rise building, a plurality of communication adapters installed at a plurality of locations at required intervals in the height direction of the magnetic structure and having built-in transmission coils and reception coils, and a plurality of headset devices wirelessly paired and connected to each of the communication adapters. The communication adapter includes a transmitter function unit that frequency-modulates a signal received via wireless communication from a paired headset and passes the modulated signal through its own transmission coil, thereby generating an electromotive force by electromagnetic induction in the receiving coil of another communication adapter via the magnetic structure; and a receiver function unit that demodulates the detected electromotive force generated in its own receiving coil by electromagnetic induction from the transmission coil of another communication adapter and transmits the demodulated signal to the paired headset via wireless communication.

[0010] Thus, when a worker wears a headset on each floor where each communication adapter is installed at a construction site of a high-rise building, and a worker on a certain floor speaks using the headset, the signal from the headset is received by the communication adapter of the paired party installed on that floor via wireless communication. Here, the signal is frequency-modulated and passed as an electric current through the transmission coil, thereby generating an interlinking magnetic flux by electromagnetic induction in the space around the transmission coil. The generated interlinking magnetic flux passes through the magnetic structure and generates an electromotive force by electromagnetic induction in the receiving coil of the communication adapter on another floor. The generated electromotive force is detected, demodulated, and transmitted to the paired headset, resulting in voice conversion. As a result, it becomes possible for workers on different floors separated in the height direction to have a voice call.

[0011] At this time, since an existing magnetic structure extending in the height direction of the high-rise building is used as a transmission medium at the construction site of the high-rise building, there is no need to arrange a relay operator on the intermediate floors, nor is there a need to perform the work of laying a wired cable in advance. The problem that the working range is limited to the vicinity of the wired cable is also solved.

[0012] That is, workers on each floor can freely work without being restricted by wired cables within a wide range where the wireless communication of the headset paired with the communication adapter on that floor can reach. In addition, the personnel previously assigned as relay operators can be redirected to the construction work. Therefore, it becomes possible to significantly improve the work efficiency compared to the conventional method.

[0013] In addition, since it is possible to efficiently construct an in-house communication network with a simple operation of installing communication adapters on each floor at the construction site of a high-rise building, it will greatly contribute to shortening the construction period. Moreover, since there is no need to use a high-output transceiver, the concern of adversely affecting other devices is eliminated.

[0014] Furthermore, in the communication system of the present invention, the transmitter function unit in the communication adapter preferably includes a receiving circuit that receives a microphone signal via wireless communication from a paired headset and converts it into an audio signal, a modulation circuit that narrows the band of the audio signal converted by the receiving circuit with a band-pass filter, and an output circuit that adds a carrier frequency to the audio signal whose band has been narrowed by the modulation circuit, performs AM modulation and amplification, and then sends it to its own transmission coil.

[0015] Also, in the communication system of the present invention, the receiver function unit in the communication adapter preferably includes an input circuit that removes and amplifies the portion other than the carrier frequency band of the received signal composed of the electromotive force generated in its own receiving coil by electromagnetic induction and creates an audio signal that is dropped to an intermediate frequency, a demodulation circuit that converts the audio signal created by the input circuit into an audible frequency, amplifies it, and then narrows the band with a band-pass filter, and a transmission circuit that transmits the audio signal whose band has been narrowed by the demodulation circuit to the paired headset via wireless communication.

[0016] Furthermore, in the communication system of the present invention, the magnetic structure forming the transmission medium may be a cable rack for wiring and binding a cable extending in the height direction of a high-rise building.

Advantages of the Invention

[0017] According to the communication system of the present invention described above, since it is possible to realize voice calls between workers by using an existing magnetic structure at the construction site of a high-rise building as a transmission medium, it is possible to realize mutual communication with a large height difference without arranging a relay person and without adversely affecting other devices. Moreover, it is possible to achieve an excellent effect of efficiently constructing an in-house communication network with a simple operation.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] FIGS. 1 to 3 show an embodiment of the present invention. A communication system that realizes voice calls between workers using an existing magnetic structure extending in the height direction of a high-rise building as a transmission medium at a construction site of a high-rise building will be described in detail below. In the example shown here, a case where a cable rack 1 for wiring and binding a cable extending in the height direction of a high-rise building is used as a transmission medium is described as an example.

[0021] This type of cable rack 1 must be constructed before laying cables between upper and lower floors. Generally, it has an appropriate material property of being made of iron which is a ferromagnetic material, and it is also preferable in terms of its structural suitability of being connected without interruption between upper and lower floors. Adopting the cable rack 1 as the existing magnetic structure to be used as a transmission medium in this embodiment is an extremely effective choice.

[0022] As shown in FIG. 1, in the communication system of the present embodiment, a plurality of communication adapters 4 are installed at a plurality of locations (specifically, each floor of a high-rise building) at required intervals in the height direction in the cable rack 1 and incorporate a transmission coil 2 and a reception coil 3, and a plurality of headsets 5 are provided which are paired and connected to each of the communication adapters 4 by wireless communication. As shown in FIG. 2, the communication adapter 4 includes a transmitter function unit 6 that frequency-modulates a signal received from a paired headset 5 via wireless communication and causes an electromotive force due to electromagnetic induction to be generated in the reception coil 3 of another communication adapter 4 via the cable rack 1 by flowing the signal through its own transmission coil 2, and a receiver function unit 7 that detects and demodulates the electromotive force generated in its own reception coil 3 due to electromagnetic induction from the transmission coil 2 of another communication adapter 4 and transmits the result to the paired headset 5 via wireless communication.

[0023] The transmitter function unit 6 in the communication adapter 4 includes a reception circuit 8 that receives a microphone signal from a paired headset 5 via wireless communication and converts it into an audio signal, a modulation circuit 9 that narrows the band of the audio signal converted by the reception circuit 8 using a band-pass filter, and an output circuit 10 that amplifies the audio signal with the narrowed band by the modulation circuit 9, adds the carrier frequency from a carrier oscillation circuit, performs AM modulation and amplification, and then flows the result through its own transmission coil 2.

[0024] The receiver function unit 7 in the communication adapter 4 includes an input circuit 11 that removes, using an RF filter, a frequency band other than the carrier frequency band of a reception signal composed of the electromotive force generated in its own reception coil 3 due to electromagnetic induction, amplifies the remaining signal, and mixes it with an intermediate frequency from a local oscillation circuit using an oscillation mixing circuit to create an audio signal that has been shifted to the intermediate frequency, a demodulation circuit 12 that converts the audio signal created by the input circuit 11 into an audible frequency, amplifies it, and then narrows the band using a band-pass filter, and a transmission circuit 13 that transmits the audio signal with the narrowed band by the demodulation circuit 12 to a paired headset 5 via wireless communication.

[0025] Furthermore, in the communication system of this embodiment, a power source 14 such as a dry battery is built into each communication adapter 4, enabling it to be used without particularly wiring a power cable or the like. Moreover, a mask signal for temporarily turning off the input circuit 11 is output from the output circuit 10 during transmission.

[0026] Thus, in this way, at each floor where each communication adapter 4 is installed at the construction site of a high-rise building, a worker wears a headset 5. For example, when worker A on a certain floor speaks with the headset 5, the signal from the headset 5 is received by the communication adapter 4 of the pairing partner installed on that floor via wireless communication, frequency-modulated here, and passed as a current to the transmission coil 2, generating an interlinking magnetic flux 15 by electromagnetic induction in the space around the transmission coil 2. The generated interlinking magnetic flux 15 passes through the cable rack 1 and generates an electromotive force by electromagnetic induction in the receiving coil 3 of the communication adapter 4 on other floors. The generated electromotive force is detected, demodulated, and transmitted to the headset 5 of the pairing partner, worker B, resulting in voice conversion, making it possible for workers A and B on different floors separated in the height direction to conduct a voice call.

[0027] At this time, since the existing cable rack 1 extending in the height direction of the high-rise building is used as a transmission medium at the construction site of the high-rise building, there is no need to arrange a relay operator on the intermediate floors, nor is it necessary to perform the work of laying a wired cable in advance, and the problem that the working range is limited to the vicinity of the wired cable is also solved.

[0028] That is, the workers on each floor can freely work without being restricted by the wired cable within a wide range where the wireless communication of the headset 5 paired with the communication adapter 4 on that floor reaches, and it is also possible to transfer the personnel assigned to the relay operator to the construction work, so it is possible to significantly improve the work efficiency compared to the past.

[0029] In addition, since it is possible to efficiently construct an in-site communication network with a simple operation of installing the communication adapter 4 on each floor at the construction site of a high-rise building, it will greatly contribute to shortening the construction period. Furthermore, since there is no need to use a high-output transceiver, the concern of having an adverse effect on other devices is eliminated.

[0030] Therefore, according to the above-described embodiment, since it is possible to realize voice calls between workers by using the existing cable rack 1 at the construction site of a high-rise building as a transmission medium, it is possible to realize mutual communication with a large height difference without arranging a relay person and without adversely affecting other devices. Moreover, it is possible to efficiently construct an in-site communication network with a simple operation.

[0031] Note that the communication system of the present invention is not limited only to the above-described embodiment. For the magnetic structure forming the transmission medium, in addition to using a cable rack for wiring and binding cables extending in the height direction of a high-rise building, it is possible to use a steel frame, a construction scaffold, LGS: Light Gauge Steel (lightweight steel frame used as a base material for walls and ceilings), etc. extending in the height direction of a high-rise building. Of course, various modifications can be made without departing from the gist of the present invention.

Explanation of Reference Numerals

[0032] 1 Cable rack (magnetic structure) 2 Transmitting coil 3 Receiving coil 4 Communication adapter 5 Headset 6 Transmitting function unit 7 Receiving function unit 8 Receiving circuit 9 Modulation circuit 10 Output circuit 11 Input circuit 12 Demodulation circuit 13 Transmitting circuit 14 Power supply 15 Linking magnetic flux

Claims

1. A communication system that realizes voice calls between workers using an existing magnetic structure extending in the height direction of a high-rise building as a transmission medium at a high-rise building construction site, comprising a plurality of communication adapters installed at a plurality of locations spaced at required intervals in the height direction of the magnetic structure and incorporating a transmission coil and a reception coil, and a plurality of headsets wirelessly paired and connected to each of the communication adapters, wherein the communication adapter includes a transmitter function unit that frequency-modulates a signal received via wireless communication from a headset of a pairing partner and sends it to its own transmission coil, thereby generating an electromotive force by electromagnetic induction in the reception coil of another communication adapter via the magnetic structure, and a receiver function unit that demodulates and detects an electromotive force generated in its own reception coil by electromagnetic induction from the transmission coil of another communication adapter and transmits it to the headset of the pairing partner via wireless communication. The communication system is characterized by this.

2. The transmitter function unit in the communication adapter includes a reception circuit that receives a microphone signal via wireless communication from a headset of a pairing partner and converts it into an audio signal, a modulation circuit that narrows the band of the audio signal converted by the reception circuit with a band-pass filter, and an output circuit that adds a carrier frequency to the audio signal with a narrowed band by the modulation circuit, performs AM modulation and amplification, and then sends it to its own transmission coil. The communication system according to claim 1 is characterized by this.

3. The receiver function unit in the communication adapter includes an input circuit that removes and amplifies a frequency band other than the carrier frequency band of a reception signal composed of an electromotive force generated in its own reception coil by electromagnetic induction and creates an audio signal dropped to an intermediate frequency, a demodulation circuit that converts the audio signal created by the input circuit into an audible frequency, amplifies it, and then narrows the band with a band-pass filter, and a transmission circuit that transmits the audio signal with a narrowed band by the demodulation circuit to the headset of the pairing partner via wireless communication. The communication system according to claim 1 or 2 is characterized by this.

4. The communication system according to claim 1, 2, or 3, characterized in that the magnetic structure forming the transmission medium is a cable rack for wiring and binding a cable extending in the height direction of a high-rise building.

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