FR2677833A1 - Remote surveillance installation with slow-scanning using the mobile radio communications system - Google Patents

Abstract

The installation comprises - a first unit (1) including a view-taking video camera (3) and a slow-scanning television transmitter (5), and - a second unit (2) comprising a slow-scanning television receiver (9) and a monitor (8) linked to the output of this receiver (9). <??>These units (1, 2), at least one of which is a mobile unit, further comprise respective link means (6; 10, 11) able to allow them to communicate with each other over a preexisting telecommunications system (7, 12) which includes the telephone network (7) and at least one linking channel of the mobile radio type (12).

Description

The present invention relates to installations

Slow scan monitoring stations.

The subject of the invention is more precisely a remote monitoring installation comprising a first station comprising a video camera and a slow-scan television transmitter connected to the output of the video camera, and

a second station including a remote

slow scan television and a video monitor connected to the output of said receiver; at least one of said stations being mobile; said stations further comprising means

respective connections capable of enabling communication

cation through a pre-

existing, including the telephone network and at least

a mobile radio type link channel.

Other features and advantages of the ins-

telesurveillance installation according to the invention will be

better understood from reading the detailed description

which will follow, of several exemplary embodiments, with reference to the accompanying drawings in which Figures 1 to show five different embodiments of a

remote monitoring installation according to the invention.

In the embodiment shown in Figure 1, a remote monitoring installation according to

the invention comprises two positions designated in their en-

appears by 1 and 2.

The station 1 includes a television camera 3 for shooting The baseband video signal generated in the operation of the television camera 3 is carried by means of a coaxial cable 4 to the input of a

slow-scanning transmitter 5 of a type known per se This

deny scans the image taken in a time

variable, for example between 5 and 20 seconds, and trans-

forms the composite video signal into a speech signal in the band 1000 to 3000 Hz, compatible with

normal telephone circuits.

The output of slow scan transmitter 5 is

connected to a subscriber telephone set 6.

In the embodiment according to FIG. 1, the apparatus

telephone line 6 is intended to provide virtually no

that the device function for calling the station re-

receiver 2.

In operation, the signals from the device

such telephone 6 reach, via the subscriber's line, the telephone exchange (PABX) on

closer, indicated in 7.

The station 2 is mobile and it is installed, for example on board a motor vehicle It comprises a television monitor 8 whose input is connected to the output of a slow-scanning television receiver 9 of a type known per se. The input of this receiver 9 is connected to the output of a cellular mobile radio terminal 10 of

type known per se, provided with an antenna 11.

In operation, the call signal from subscriber telephone 6 reaches the telephone exchange on

closest 7 which forwards the call over the

Hertzian radio-electric sounds from the communication system

cellular cation The call signal is broadcast by the

relay pylons in this network until the end of

called mobile terminal 10, by answering the call, establishes a duplex type link Thus, the signal transmitted by the

nearest relay pylon 12 is received by the anten-

ne 11 of terminal 10 When this terminal has recognized its own call code, it enables the ringtone with which it is equipped, by warning the subscriber of mobile station 2 of the call Lifting the handset of terminal 10 establishes the link, by actually connecting the output of the terminal to the input of slow-scanning receiver 9 When this link has been established, the slow-scanning transmitter 5 of station 1 sends to receiver 9 of mobile station 2 a start signal followed by the signals image tablets

in the 1000-3000 Hz band The receiver 9, which is typically

equipped with its own image memory, stores incoming information and allows presentation

on the monitor 8 images of which the quality and definition

tion are a direct function of the refresh period of the image A short refresh times will correspond to a low definition and, conversely, to longer refresh times, will correspond

better definition.

The operating mode described above is based on a manual calling mode which can moreover be automated in a manner known per se, for example by combining the subscriber's telephone 6 with an alarm indicator or a monitoring device. control, and substituting

to the manually-selected telephone set 6, a device

automatic memory telephone ringing In this case, when an alarm situation occurs, for example of theft or fire, at the place monitored by the fixed station 1, the telephone device of this station automatically calls the number of remembered subscriber and, when

the link with the mobile radio terminal 10 of the mobile station

bile has been carried out, it automatically enables the

slow scan tor 5 to the transmission of image signals. The installation described above for the

Figure 1 allows remote monitoring of a remote station

mobile cepteur, a stationary objective that is

protect such as a bank, a jewelry store, an apartment

ment, etc. In Figure 2, there is shown a variant

implementation of the remote monitoring installation

according to the invention, in which the fixed station 1 is the

receiving station while mobile station 2 is the pos-

you transmitter.

In Figure 2, we have again assigned the

same reference numbers to identical parts or elements

ticks or corresponding to parts or elements already described.

In the installation of figure 2, the mo-

bile 2 includes a television camera 3 which, through

to a coaxial cable 4, provides a baseband image video signal to the input of a scanning transmitter

slow 5 The output of this transmitter is connected to the input

input of a cellular mobile radio terminal 10.

Fixed station 1 includes a television monitor.

sion 8, the input of which is connected to the output of a

slow-scan video player 9, in turn having its

connected to a subscriber telephone set 6 connected

to the nearest telephone exchange 7 through

diary of a subscriber line.

In the embodiment according to FIG. 2, the transmitter

slow-scanning sensor 5 of mobile station 2 performs a basal

layage of the image taken, in a time which may vary

between 2 and 40 seconds and transforms the video signal

posite into a sound signal in the 1000-3000 Hz band, compatible with normal telephone circuits.

transmitter output 5 is connected to the control console

the and control of the terminal 10, which performs the function of a selection and transmission / reception device The

signal at the output of terminal 10 is radiated by the an-

antenna 11 until reaching the relay pylon 12 closest to the cellular mobile radio telecommunications system.When a free channel is available, a duplex link is automatically established between the

terminal 10 of mobile station 2 and the cellular system.

Through the network of radio-electric links of

Vice, the call signal, preceded by the selection code of the destination sector, reaches the urban exchange (PABX) 7 closest to the landline 1 The signal reaches the

subscriber telephone 6 through the urban network and the re-

ringing of this device warns of the incoming call Lifting the handset of telephone 6, the connection is established and, at this time, sender 5 of the

mobile station 2 sends a start signal over the network

ge, tracking the compressed image signal in the band

1000-3000 Hz.

The receiver 9 of the fixed station 1, equipped with its

own image memory, stores incoming information

signals and outputs a composite video signal to monitor 8

te whose quality or definition depends on the

refresh period of the image itself.

Also in the case of FIG. 2, the operating mode described above is based on a manual calling mode which can be automated by combining the mobile radio terminal 10 with an alarm indicator or a control device and, in using the memories of

the control console of this terminal Thus, in practice

that, when an alarm situation occurs, the

sole of terminal 10 automatically calls the number

stored subscriber and, when the connection with the telephone

subscriber 6 of the fixed set is established, enables automatic

only the receiver 9.

The embodiment described above with regard to

figure 2 is particularly indicated for the over-

remote monitoring of means and moving objects and, in any case, in all cases in which

the transmitter cannot be connected to a telephone line.

than normal (truck, armored van, slip detection

elements of land, etc.).

In Figure 3, there is shown another embodiment of the installation according to the invention, in

which the two positions, shooting and surveillance

remote, are mobile The shooting station of the installation according to Figure 3 has substantially the same

configuration that the shooting station of the installation

tion shown in Figure 2 and it comprises a camera

TV ra 3, a slow scan transmitter 5, a

cellular mobile radio terminal 20 and a cor-

respondent 21.

Receiver station 2 has substantially the same con-

figure that the receiving station of the installation is

lon Figure 1 and it therefore comprises a monitor 8, connected to a slow-scanning receiver 9 to the input of which is coupled a cellular mobile radio terminal 10 provided

an antenna indicated in 11.

In operation, the baseband video signal from TV camera 3 at station 1 reaches transmitter 5 which slowly sweeps through.

the image in variable time and the transformation of the

gnal composite video a sound signal in said band

between 1000 and 3000 Hz The control console

tr 8 the and control of the mobile radio terminal 20 ensures

the function of selection device and transmission / re-

ception The signal from this terminal is radiated into the ether through the antenna 21 until it reaches the relay pylon 22 of the nearest cellular mobile radio system As soon as a

free channel, the call signal launched in the at- ether

dyes the relay pylon 12 closest to the terminal

mobile radio 10 from station 2 through the link network

cellular system service radio sounds.

Lifting the handset from the control console of the

terminal 10 establishes the link between the two stations.

Transmitter 5 of station 1 then sends a signal over the network.

start-up signal, followed by the compressed image signal in

the 1000-3000 Hz band.

The slow-scanning receiver 9 of station 2 emma-

stores the incoming information in memory and then

te, outputs a composite video signal to monitor 8

the quality or definition of which depends on the

Image refresh period.

The operating mode of the installation

described above is based on a manual calling mode, which

can also in this case be automated.

The installation described above next to

Figure 3 is particularly indicated in situations

tions in which it is necessary to be able to exchange

management between mobile stations or stations which are not connected by the telephone network, especially for

surveillance and security reasons.

The configurations described above opposite

Figures 1 to 3, are of the unidirectional type.

will now write in relation to figures 4 and 5 two modes

realization of the installation which are suitable for

be a two-way type communication.

In the embodiment according to FIG. 4, the station 1 is stationary while the station 2 is mobile The stationary station 1 comprises a television camera 3 connected by a coaxial cable 4 to a slow-scanning transmitter 5 This station further comprises a monitor 28 connected to the output of a slow-scanning receiver 29 The output of transmitter 5 and the input of receiver 9 of station 1

are connected to a switching device 40, for example

ple of the type known as a "fork", connected to

a subscriber telephone device 6 This device is

linked to the nearest exchange (PABX) 7 of the telephone network

fuck.

Mobile station 2 includes a television camera

sion 23 connected by a coaxial cable 24 to the input of a

slow-scan transmitter 25 Station 2 includes in or-

be a monitor 8, connected to the output of a

slow layage 9 The output of the transmitter 25 and the input of

slow-scan receiver 9 of station 2 are connected closely

pectively the transmit channel and the receive channel

a cellular mobile radio terminal 10 with which is associated

an antenna 11.

In figure 4, we have once again indicated

in 12 the relay pylon of the cellular mobile radio system

area which is closest to mobile station 2.

The installation in figure 4 makes it possible to send

image signals from fixed station 1 to mobile station 2 and

payment In the event of simultaneous transmission, the connection

carried out by time division, for example with periods of emission of 20 seconds, alternately in one direction and in the opposite direction, spaced apart by pauses, of 2 seconds for example for a possible change of the switching commands and for the reversal of the direction of emission. The embodiment shown schematically in FIG. 5 is also of the bidirectional type, and allows the transmission in both directions of image signals between two stations 1 and 2, both of the mobile type. The two stations therefore have the same structure, in in particular the structure already described with regard to the mobile station 2 of the system according to

figure 4.

In operation, the transmission channel between mobile stations 1 and 2 of FIG. 5 is busy in

one direction, for example, for 20 seconds (period of

image refresh) for transmitting an image from the cellular mobile radio terminal 20 to the cellular mobile radio terminal 10 After a 2 second pause to allow the possible exchange of switching commands

and for reversing the direction of transmission, the transmission channel

tion is occupied for a further 20 seconds for the

see an image in the opposite direction, and therefore the terminal

mobile radio 10 to the mobile radio terminal 20.

The installation according to the invention makes it possible to

play a television transmission from a distance, at

slow layage, using a mixed transmission channel (radio and telephone network) to replace the network

normal telephone The installation which associates the

already existing slow scan TV positives

new mobile cellular communication systems

telephony, is particularly well suited for applications in the security sector, and

for the creation of flexible networks.

Of course, other modifications and variations

can be made by those skilled in the art to the dis-

positive which have just been described only as a

of non-limiting example without departing from the scope of the invention.

tion.

Claims (5)

R E V E N D I C A T I O N S 1 Remote monitoring installation comprising a first station (1) comprising a video camera camera (3) and a slow-scan television transmitter (5) connected to the output of the video camera (3), and a second station (2) comprising a slow-scan television receiver (9) and a video monitor (8) connected to the output of said receiver; at least one (1) of said stations (1, 2) being mo- bile; said stations (1, 2) further comprising respective connection means (6; 10, 11) suitable for allow communication through a telephone system pre-existing communication (7, 12), including the telephone network (7) and at least one connecting channel of the mobile radio (12). 2 Installation according to claim 1, charac- terized in that the first station (1) is fixed and the outlet its slow-scanning transmitter (5) is connected to a device subscriber telephone line (6) or equivalent, connected to the telephone network; and in that the second station (2) is mobile and the input of its slow-scanning receiving apparatus (9) is connected to a cellular mobile radio terminal (10) equipped with an- antenna (11) and capable of receiving signals from the tele- audio through the mobile radio communication system. 3 Installation according to claim 1, charac- terized in that the first station (2, figure 2) is mobilized the and the output of its slow-scanning transmitter (5) is connected to a cellular mobile radio terminal (10) provided with an antenna (11) and able to transmit signals to the telephone network through a communication system it mobile radio communication and in that the second station (1, figure 2) is fixed and the input of its slow-scanning receiver device (9) is connected to a subscriber telephone device (6) or equivalent, connected to the telephone network. 4 Installation according to claim 1, charac- terized in that the first station (1, figure 3) is moved bile and the output of its slow-scanning transmitter (5) is connected to a first cellular mobile radio terminal (20) equipped with an antenna (21) and able to emit signals general to the telephone network through the mobile radio communication system (12, 22); and in that the second station (2, figure 3) is also mobile and the input of its slow-scanning receiver (9) is connected to a second cellular mobile radio terminal. re (10) equipped with an antenna (11) and able to receive signals from the telephone network through the mobile radio communication (12, 22). Installation according to claim 1, characterized in that the first station (1, figure 4) is fixed and further comprises a slow-scanning receiver (29). and a monitor (28) connected to this receiver (29); the sor- tie of the transmitter (5) and the input of the receiver (29) of the said first post (1) which can selectively be delivered connected to a subscriber telephone set (6) or equivalent slow, connected to the telephone network; and in that the second station (2, Fig. 4) is movable and further comprises a pick-up video camera (23) and a slow-scan transmitter (25) connected to the output of said video camera (23); the output of the transmitter (25) and the input of the receiver (9) of said second station (2) being respectively connected to the transmission channel and to the reception channel of a cellular mobile radio terminal (10) equipped with an antenna (11) and capable of transmitting / receiving view signals to the telephone network / telephone network through the radio communication system mobile (12). 6 Installation according to claim 1, charac- terized in that the first station and the second station (1, 2, figure 5) are both movable and each include a video camera (3, 23) connected to a slow-scan transmitter (5, 25) and a monitor ( 8, 28) connected to a slow scan receiver (9, 29); however, in each station the output of the slow-scan transmitter (5, 25) and the input of the slow-scan receiver (9, 29) are coupled to the transmit channel and the receive channel, respectively. a cellular mobile radio terminal (10, 20) equipped with an antenna (11, 21) and able to transmit / receive signals to / from the telephone network through the mobile radio communication system.