JPH10271469A - Private branch cordless image communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install pluralities of cordless image transmitters to the system, where image reception terminals are movable and remote monitoring using a public channel network is attained. SOLUTION: This system is provided with a single exchange connecting to a public telephone line network, pluralities of cordless image transmitters 15 installed in a private radio communication enable area, one radio connection device 12 or over capable of radio connection to the transmitters 15, and a base station equipment 4 that controls connection of a signal exchanged between the exchange and the cordless image transmitters. That is, since the system is the private branch cordless image communication system consisting of the cordless image transmitters 15 and image reception terminals 14 able to exchange signals the transmitters through channels, the image receivers 14 are movable in the area and remote monitoring using a public channel network is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cordless image communication system suitable for connecting an image receiving terminal capable of exchanging signals with a cordless image transmitter.

[0002]

2. Description of the Related Art As a conventional cordless image communication system having a plurality of cameras, there is a system having a configuration as shown in FIG. A camera unit 31 for acquiring an image, an image encoding unit 32 for converting the acquired image into a code suitable for a transmission method, a spread spectrum transmitter 33 for wirelessly transmitting encoded data, and a spread spectrum receiving a transmission signal. A receiver 34, a switcher 35 capable of selecting signals from a plurality of cameras, and an image receiving terminal 36 which is connected to the switcher and decodes and displays encoded image data, eliminates wiring to the plurality of cameras. A cordless system can be built. In addition, in a private image communication system having a plurality of cameras connected to a line, a system in which a camera unit and a switcher unit are connected by wire, and an image receiving terminal similarly transmits and receives an image signal by wire connection. Is common.

[0003]

However, in the above-described wireless image communication using the spread spectrum method, since the number of spread spectrum receivers must be equal to the number of installed cameras, the image receiving terminal is installed in a fixed place. Then, the image of the camera selected from the terminal is monitored. That is, there is a problem that the image receiving terminal cannot be moved and cannot be monitored at a desired place at any time. In addition, there is a problem that monitoring from a remote place cannot be performed because it is not connected to a public line. In a system having a wired camera, connection to a public line is easy and monitoring from a remote location is possible. However, there is a problem that an installation place is limited because the camera is wired. . Further, similarly to the spread spectrum system, there is also a problem that it is difficult to move the terminal because the image receiving terminal is connected by wire.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a single exchange connected to a public telephone network and a wireless communication system installed in a wireless communication area of the premises. A plurality of cordless image transmitters, one or more wireless connection devices wirelessly connectable to the plurality of cordless image transmitters, connected between the single exchange and the one or more wireless connection devices, A cordless image communication system comprising a base station device for controlling connection of signals exchanged between an exchange and the cordless image communication device, and an image receiving terminal capable of exchanging signals through a line with the cordless image transmitter. A system, wherein the image transmitter comprises:
A camera unit for acquiring an image, an image encoding unit for encoding the acquired image, and a transmission unit for wirelessly transmitting the encoded image data, wherein the image receiving terminal transmits data from the image transmission unit. , An image decoding unit that decodes the received image data, and an image display unit that displays the decoded image. Further, the base station apparatus has a line connection device for connecting to a line of the exchange, an interface circuit for exchanging digital signals with the wireless connection device, the line connection circuit and the interface circuit. And connection means for selecting and connecting a call signal, and control means for controlling operations of the line connection circuit, the interface circuit, and the connection means.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of an embodiment of a private cordless image communication system according to the present invention. 1 is a private branch exchange (P) connected to a public line network.
BX), the private branch exchange 1 outputs a plurality of cordless image transmitters and a plurality of lines 2 for connecting to a plurality of existing image receiving terminals in addition to a line for connecting to the accommodation terminal 3. Each of the plurality of lines 2 is connected to each of a plurality of line connection circuits 6 in the base station device 4.
The base station device 4 is provided with a plurality of interface circuits 8, each of which is connected to the same number of wireless connection devices 12 via a connection cable 11. Between each of the plurality of line connection circuits 6 and the interface circuit 8, there is provided a connection means 7 for selecting and connecting communication from an external terminal and communication from an internal terminal. To each of the connection means 7 and the interface circuit 8, a control means 9 for controlling each operation of the connection means 7, the interface circuit 8, and the line connection circuit 6 is connected. The interface circuit 8 is connected to a power supply unit 10 that supplies power to the base station device 4 and also supplies power to the wireless connection device 12 via a connection cable 11.

[0006] Each of the wireless connection devices 12 forms a wireless zone (wireless communicable area) 5 at a different location from one another, and one or a plurality of cordless image transmitters 15 existing in each wireless zone 5 and an image. Set the receiving terminal 14 to the wireless channel 1
3 for wireless communication. In the connection cable 11, the image data and the command data are exchanged by time-divided digital signals, and the exchange of the command data is possible even when the image data communication path is connected. When time-division wireless control is performed as in a PHS communication device, one wireless connection device 12
Thus, wireless connection with a plurality of cordless image transmitters 15 becomes possible. Then, image data when a plurality of cordless image transmitters 15 are connected is also transmitted as time-division digital data between the base station apparatus 4 and the wireless connection apparatus 12 via the connection cable 11.

As shown in FIG. 3, the wireless zone of the wireless connection device 12 is previously overlapped with an adjacent wireless zone as indicated by an arrow D, so that the image receiving terminal 14 is moved to a certain wireless zone B. From the wireless zone A to the wireless zone A adjacent to the wireless zone B by the command from the base station apparatus 4 or the automatic recall process from the image receiving terminal 14 to the base station apparatus 4 Can be switched to the one in the wireless zone A, and it is possible to move to another wireless zone without interruption of image communication.

Therefore, this cordless image communication system can provide the same function as a handover of a generally used mobile phone. Further, since the private branch exchange 1 of the private cordless image communication system of the present invention is connected to the public line network, the private branch cordless image transmitter can be connected to the private line cordless image transmitter by calling from the public line network by an image receiving terminal corresponding to the system. It becomes possible. That is, image monitoring from a remote place using the public line network can be performed.

Next, the configuration of the cordless image transmitter will be described with reference to FIG. The image conversion unit 2 converts the image acquired by the camera unit 21 into an input format to the image encoding unit 23.
Convert by 2. The image encoding unit 23 performs an encoding process on a signal that can be transmitted through a line. For example, communication image coding H.264. 261 and still image coding JPEG. The image data encoded by the data communication unit 24 and the RF communication unit 25 is wirelessly transmitted. The system control unit 26 performs coding control such as a quantization parameter for image coding, and performs call control of the data communication unit and the RF communication unit and control of data transmission errors. Further, by preparing the sensor input at the end of the day, the image can be transmitted to the receiving terminal holder who does not know where it is when the set event occurs. This event is
For example, there are a timer, an infrared human detection sensor, a moving object detection sensor by image processing, a push button, and the like, and it is possible to automatically transmit an image to a receiving terminal determined at a set time, such as once a hour. .

In the embodiment of the present invention, a system in which one private branch exchange 1 is connected to one base station apparatus 4 has been described. However, in the present invention, a plurality of base station apparatuses 4 are connected, and It goes without saying that the present invention is also applied to a system in which a zone is constructed. Further, the indoor cordless image communication system can be applied both indoors and outdoors.

[0011]

As described above, according to the cordless image communication system of the present invention, since there is no wiring for the cordless image transmitter, it is easy to install a plurality of units on the premises. In addition, since the image receiving terminal can be handed over on the premises, monitoring can be performed by selecting a place anywhere. The timer and sensors set in the cordless image transmitter and the automatic calling function enable the image to be transmitted to the receiving terminal holder who does not know where it is. Further, since the image receiving terminal can be connected to the cordless image transmitter using the public line network in the present system, monitoring can be performed from a remote place.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a local cordless image communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a detailed configuration of a cordless image transmitter 15 of the local cordless image communication system of FIG.

FIG. 3 is a conceptual diagram illustrating an operation of the image receiving system when moving between different wireless zones in the private cordless image communication system of FIG. 1;

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 private branch exchange 2 communication line 3 accommodation terminal 4, 41 base station device 5 wireless zone 6 line connection circuit 7 connection means 8 interface circuit 9 control means 10 power supply unit 11, 35, 42 connection cable 12, 43, 45 wireless connection device 13 Wireless channel 14, 37, 44 Image receiving terminal 15 Cordless image transmitter 21, 31 Camera unit 22 Format conversion unit 23, 32 Image encoding unit 24 Data communication unit 25 RF communication unit 26 Cordless image transmitter system control unit 33 Spread spectrum Transmitter 34 Spread spectrum receiver 36 Switcher

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04Q 7/34 H04Q 7/04 B

Claims (3)

[Claims] An exchange connected to a public telephone network;
A plurality of cordless image transmitters installed in a wireless communicable area of the premises, one or more wireless connection devices wirelessly connectable to the plurality of cordless image transmitters, and the exchange and the one or more wireless connection In a premises cordless image communication system comprising a base station device connected between devices and controlling connection of signals transferred between the exchange and the cordless image transmitter, the image is taken by the cordless image transmitter. Wherein the image receiving terminal receives the voice and image data through the wireless connection device and the base station device. 2. The image transmitter includes a camera unit for photographing an image, an image encoding unit for encoding the photographed image, and a transmission unit for wirelessly transmitting the encoded image data. Wherein the image receiving terminal includes a receiving unit that receives transmission data from the image transmitting unit, an image decoding unit that decodes the received image data, and an image display unit that displays a decoded image. The local cordless image communication system according to claim 1. 3. The base station device is connected to the exchange, and performs a line connection control with the exchange, a line connection device, an interface circuit for performing wireless communication control with the wireless connection device, and 2. The local cordless image communication system according to claim 1, further comprising control means connected between a line connection circuit and said interface circuit for controlling the operation thereof.