JP2010109557A - Wireless intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless intercom system wherein a plurality of wireless systems of different communication systems or different frequency bands are loaded and antennas are collected to one. <P>SOLUTION: The wireless intercom system transmits and receives data wirelessly between the terminal antennas of a plurality of wireless terminals of the same or different using frequency band and the same or different communication system (except the case that the using frequency band is the same and that the communication system is the same) and the master unit antenna of a master unit. In the master unit antenna, a pair of different radiation elements corresponding to the using frequency band and the communication system are disposed symmetrically by a coaxial cable, and a trap circuit for obtaining tuning mutually between the different radiation elements is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless intercom system, and more particularly, to a wireless intercom system capable of responding to visitors, monitoring indoors at a plurality of locations, sensor monitoring, and the like.

  An intercom system using a wireless system has been used in the past. For example, a radio signal from a portable wireless transmitter is received by a wireless receiver built in the interphone master unit, and when this radio signal is received, it is shared. A technique capable of unlocking the electric lock at the entrance is known (for example, see Patent Document 1).

  In the wireless intercom system described in Patent Document 1, a slot antenna is used, but as a type of antenna, for example, a dipole antenna can be used (for example, refer to Patent Document 2).

  By the way, in order to further add a plurality of functions such as indoor monitoring and sensor monitoring functions in the wireless intercom system, it is necessary to newly install radio systems having different frequency bands and different communication systems. In this case, it is usually necessary to mount an antenna for each individual wireless system.

JP-A-5-236553 JP-A-6-188610

  As described above, a wireless intercom system has been conventionally known. When a plurality of wireless systems are mounted, it is necessary to mount an antenna for each wireless system.

  However, since the antenna takes a very large mounting area, there is a problem that it is extremely difficult to accommodate a plurality of antennas in one casing. Therefore, mounting a plurality of antennas in one housing has been an impediment to demands for reducing the size and thickness of intercom systems.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a wireless intercom system in which a plurality of radio systems having different communication methods or different frequency bands are mounted and antennas are integrated into one. It is said.

  In order to solve the above problem, in the first aspect of the wireless intercom system according to the present invention, the terminal antennas of a plurality of wireless terminals having the same or different use frequency bands and the same or different communication methods (however, the use frequency bands are the same). Wireless intercom system that transmits and receives data wirelessly between the base unit antenna and the base unit antenna, except for the case where the communication method is the same). A pair of different radiating elements are arranged symmetrically by a coaxial cable, and a trap circuit for obtaining tuning between different radiating elements is provided.

  Further, in the second aspect of the wireless intercom system according to the present invention, in the first aspect, the base unit includes a wireless communication unit connected to the base unit antenna via a coaxial cable, and the wireless communication unit includes Is a distribution circuit for distributing different data transmission / reception units corresponding to the used frequency band and / or communication method and received data received by the main unit antenna corresponding to the used frequency band and / or communication method And a filter for passing only the predetermined frequency band corresponding to the used frequency band and / or the communication system for the reception data distributed by the distribution circuit and the transmission data from the data transmission / reception unit. And

  Further, in the third aspect of the wireless intercom system according to the present invention, in the second aspect, when the data transmission / reception unit having a different communication method and the same use frequency band is applied to the radio communication unit, the use frequency is A coaxial switch circuit for preventing interference between transmission data from any one of the data transmission / reception units having the same band and transmission data from the other data transmission unit is provided. And a filter connected in series.

  In the fourth aspect of the wireless intercom system according to the present invention, in the third aspect, the wireless communication unit detects a part of the traveling wave power of transmission data from the data transmission / reception unit to the master antenna. A directional coupler and a control circuit for controlling the coaxial switch circuit based on part of the traveling wave power detected by the directional coupler are provided.

  According to the wireless intercom system of the present invention, even when a plurality of wireless systems corresponding to visitor correspondence, indoor monitoring at a plurality of locations, sensor monitoring, and the like are mounted in a single housing, a base unit is configured by a single antenna. Therefore, the intercom system can be reduced in size and thickness.

  Hereinafter, preferred embodiments of the wireless intercom system of the present invention will be described with reference to the drawings. In the present embodiment, operations such as a call by a normal visitor and a response by a resident are the same as in the prior art, and thus description thereof is omitted.

  FIG. 1 is a configuration diagram of a wireless intercom system according to the present invention. In FIG. 1, the wireless intercom system of the present invention comprises a master unit 1, a camera-equipped cordless handset 2, and wireless terminals 3, 4, and 5. The master phone 1 and the camera-equipped cordless cordless handset 2 are connected to a communication line (interphone). Line) 2a.

  The wireless terminal 3 is composed of, for example, an interphone extension base unit, and the wireless terminal 4 is composed of, for example, a UHF band sensor wireless terminal. Further, the wireless terminal 5 is composed of, for example, a 2.4 GHz band sensor wireless terminal. The base unit 1 and each wireless terminal transmit and receive signals via the base unit antenna 1a of the base unit 1, the terminal antenna 3a of the wireless terminal 3, the terminal antenna 4a of the wireless terminal 4, and the terminal antenna 5a of the wireless terminal 5, respectively. Done.

  FIG. 2 shows a block diagram of the wireless intercom system of the present invention. In FIG. 2, the master unit 1 is connected to a power source unit 101 connected to an external AC power source terminal, a master unit CPU 102 connected to the power source unit 101 and controlling the operation of each component in the master unit 1, and the master unit CPU 102. There was a visitor who was connected to a master unit sound unit 105 having a function of making a call between a visitor and a resident via a master unit microphone (MIC) 103 and a master unit speaker (SP) 104, and also a master unit CPU 102. In order to transmit / receive data to / from each of the wireless terminals 3, 4 and 5 via the master LCD monitor 106, the master antenna 1a, and the master CPU 102, master sound unit 105, and master antenna 1a. The wireless communication unit 100 is configured.

  In addition, as described above, the main unit 1 is connected to the camera-equipped entrance slave unit 2. The camera-equipped handset 2 has a control unit 202 for operating a camera 201 that images a visitor, and a call between a visitor and a resident via a handset microphone (MIC) 203 and handset speaker (SP) 204. The slave unit acoustic unit 205 has a function to perform the above function. The camera 201 and the slave unit acoustic unit 205 are connected to the operation unit 202, respectively.

  Furthermore, the wireless intercom system of the present invention is composed of, for example, a radio terminal 3 and sensor radio terminals 4 and 5 as interphone expansion master units. The wireless terminal 3 is connected to the battery 301, the terminal CPU 302 connected to the battery 301 for controlling the operation of each component in the wireless terminal 3, the terminal microphone 302 (MIC) 303 connected between the visitor and the resident, and the terminal A terminal sound unit 305 having a function of making a call via a speaker (SP) 304, a terminal LCD monitor unit 306, which is also connected to the terminal CPU 302, and displays a video when there is a visitor, a terminal antenna 3a, and a terminal CPU 302, It comprises a terminal radio unit 300 for transmitting / receiving to / from the base unit 1 via the terminal acoustic unit 305 and the terminal antenna 3a.

  The wireless terminal 4 is connected to the battery 401, the terminal CPU 402 connected to the battery 401 for controlling the operation of each component in the wireless terminal 4, and the terminal sound connected to the terminal CPU 402 and having a function for reporting from the terminal speaker 404 (SP). Unit 405, sensor unit 406 connected to terminal CPU 402 for sensing external information, terminal antenna 4a, and sensor radio for transmitting / receiving to base unit 1 via terminal CPU 402, terminal acoustic unit 405 and terminal antenna 4a Part 400.

  Since the wireless terminal 4 may only need to notify the information from the base unit 1, it is only necessary to have a speaker at least, and it is not always necessary to install a microphone, but a microphone may be installed as necessary. There is no problem. The wireless terminal 5 has the same configuration as that of the wireless terminal 4, and thus the description thereof is omitted.

  Here, the wireless communication unit 100 has a configuration as shown in FIG. That is, the wireless communication unit 100 includes a plurality of data transmission / reception units. For example, the data transmission / reception unit 6 is a UHF band specific low power wireless system wireless unit, and the data transmission / reception unit 7 is a 2.4 GHz band wireless LAN wireless system. The data transmitter / receiver 8 is a 2.4 GHz band IEEE 802.15.4 wireless unit. Each of these data transmission / reception units is integrated into one master antenna 1a.

  Since the main unit antenna 1a needs to resonate with the respective frequencies of the respective data transmission / reception units, as shown in FIG. 4, the UHF band radiating element 12 which is a different radiating element corresponding to the used frequency band or the communication system, and A pair of 2.4 GHz band radiating elements 13 are arranged symmetrically by the coaxial cable 14. In addition, trap circuits 11a and 11b for obtaining tuning between different radiating elements 12 and 13 are provided. By providing the trap circuits 11a and 11b as described above, the high frequency side is blocked, and it is possible to create two or more resonance points with one radiating element.

  The wireless communication unit 100 is provided with a distributor 9 for distributing signals in order to share one master antenna. Furthermore, since each data transmission / reception unit is connected to one base unit antenna, if a data transmission / reception unit receives a signal from the antenna 1a during transmission, the receiving side may receive radio wave interference. Therefore, in order to prevent this, a band-pass filter is provided between each data transmitter / receiver and the distributor 9, and the frequency during transmission of the data transmitter / receiver is blocked to prevent radio interference on the receiving side. Specifically, a low-pass filter (LPF) 15 is provided in the data transmission / reception unit 6 which is a radio unit of the UHF band specific low power radio system, and a high-pass filter is provided in the data transmission / reception unit 7 which is a radio unit of the 2.4 GHz band wireless LAN system. (HPF) 16a is provided, and a high-pass filter (HPF) 16b is also provided in the data transmission / reception unit 8 which is a radio unit of the 2.4 GHz band IEEE 802.15.4 system.

  Further, the radio communication unit 100 is provided with coaxial switch circuits 10a, 10b, 10c, and 10d in order to consolidate the antennas into one and share the master antenna. This is because, for example, when a plurality of data transmission / reception units 7 and 8 having different communication methods using the same frequency, such as 2.4 GHz band, are connected to one master unit antenna, one data transmission / reception unit is transmitting. When the antenna 1a receives a signal, there is a risk of receiving radio wave interference. In some cases, a serious failure such as damage may occur on the receiving side. Therefore, when a plurality of data transmission / reception units using the same frequency band are mounted, since blocking by the bandpass filter cannot be performed, when one data transmission / reception unit receives a signal during transmission, the other data transmission / reception unit The line is cut using a coaxial switch circuit, the other data transmission / reception unit is set in a receivable state, and a circuit configuration that prevents transmission is formed to prevent radio wave interference.

  Here, when the line is cut using only one coaxial switch circuit, especially when microwaves are used, there is a possibility that isolation may not be completely obtained due to wraparound at the switch section. Therefore, a plurality of coaxial switch circuits may be connected in series to enhance and ensure isolation. That is, in FIG. 3, coaxial switch circuits 10a and 10c are connected in series for the data transmitter / receiver 7, and coaxial switch circuits 10b and 10d are connected in series for the data transmitter / receiver 8. By adopting such a configuration, it is possible to increase isolation more reliably than when one coaxial switch circuit is used.

  In addition, the wireless communication unit 100 includes directional couplers 17a and 17b for detecting and extracting a part of the traveling wave power of transmission data from the data transmission / reception units 7 and 8 to the master antenna 1a. Further, control circuits 18a and 18b are provided for controlling and driving the coaxial switch circuit using a part of the traveling wave power extracted by the directional couplers 17a and 17b. That is, the coaxial switch circuits 10a and 10c and the directional coupler 17a are connected to the data transmission / reception unit 7, and the coaxial switch circuits 10b and 10d and the directional coupler 17b are connected to the data transmission / reception unit 8. A control circuit 18a is connected to the directional coupler 17a, and a control circuit 18b is connected to the directional coupler 17b. For example, when the data transmitting / receiving unit 7 receives a signal from the antenna 1a during transmission. The control circuit 18a controls the coaxial switch circuits 10b and 10d to disconnect the line so that the data transmission / reception unit 8 is in a reception state so that transmission is not possible. On the contrary, the data transmission / reception unit 8 is shifted to a reception state by the antenna 1a during transmission. In this case, the control circuit 18b controls the coaxial switch circuits 10a and 10c to cut the line so that the data transmitting / receiving unit 7 is in a receiving state so that transmission is not possible. By adopting such a configuration, the control can be easily performed with a closed circuit in the wireless communication unit.

  In this embodiment, when a plurality of data transmission / reception units having different communication methods using the same frequency band are mounted in the wireless communication unit of the base unit, an example of controlling the coaxial switch circuit in the wireless communication unit will be described. However, the coaxial switch circuit can also be controlled by the master CPU.

It is a block diagram of the wireless intercom system of this invention. It is a block diagram of the wireless intercom system of this invention. It is a block diagram of the radio | wireless communication part of the wireless intercom system of this invention. It is an example of the main | base station antenna used for the wireless intercom system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main | base station 1a Main | base station antenna 2 Entrance terminal 3 Wireless terminal 3a Terminal antenna 4 Wireless terminal 4a Terminal antenna 5 Wireless terminal 5a Terminal antenna 6 Data transmission / reception part 7 Data transmission / reception part 8 Data transmission / reception part 9 Divider 10a Coaxial switch circuit 10b Coaxial Switch circuit 10c Coaxial switch circuit 10d Coaxial switch circuit 11a Trap circuit 11b Trap circuit 12 Radiation element 13 Radiation element 14 Coaxial cable 15 LPF
16a HPF
16b HPF
17a Directional coupler 17b Directional coupler 18a Control circuit 18b Control circuit 100 Wireless communication unit

Claims (4)

Terminal antennas (3a, 3a, 4a, 5a) of a plurality of wireless terminals (3, 3, 4, 5) having the same or different use frequency bands and the same or different communication methods (however, communication methods having the same use frequency bands) Wireless intercom system that performs wireless data transmission / reception between the base unit antenna (1a) and the base unit antenna (1a),
In the master antenna, a pair of different radiating elements (12, 13) corresponding to the used frequency band and the communication method are arranged symmetrically by a coaxial cable (14), and between the different radiating elements. A wireless intercom system comprising a trap circuit (11a, 11b) for obtaining tuning. The base unit includes a wireless communication unit (100) connected to the base unit antenna via the coaxial cable,
The wireless communication unit includes different data transmitting / receiving units (6, 7, 8) corresponding to the used frequency band and / or the communication method, and the parent frequency corresponding to the used frequency band and / or the communication method. A distribution circuit (9) for distributing the reception data received by the machine antenna, and the received frequency band and / or the transmission data from the data transmission / reception unit distributed by the distribution circuit. The wireless intercom system according to claim 1, further comprising a filter (15, 16a, 16b) for allowing passage of only a predetermined frequency band corresponding to the communication method. When the data transmission / reception unit having the same use frequency band is applied to the wireless communication unit, the transmission data from any one of the data transmission / reception units having the same use frequency band is applied. And a coaxial switch circuit (10a, 10b, 10c, 10d) for preventing interference with transmission data from the other data transmission unit,
The wireless intercom system according to claim 2, wherein the coaxial switch circuit is connected in series between the data transmitting / receiving unit and the filter.   The wireless communication unit includes a directional coupler (17a, 17b) for detecting a part of traveling wave power of the transmission data from the data transmitting / receiving unit to the master antenna, and the directional coupler. The wireless intercom system according to claim 3, further comprising: a control circuit (18a, 18b) for controlling the coaxial switch circuit based on a part of the traveling wave power detected in this way.

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