Patent
1983-08-29
1986-04-01
Brady, W. J.
179 5R, H04M 1100
Patent
active
045800081
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a simple remote control device which uses the public telephone network as a transmission medium.
2. Description of the Prior Art
In addition to radio remote control devices, several remote control installations using telephone lines are known, in particular those described in the following documents: US-A-4 206 444, GB-B-1 235 481, FR-A-2 074 678 and FR-A-2 138 217.
U.S. Pat. No. A-4,206,444 relates more particularly to a computer power-supply control which even requires a special telephone line. For this reason, this device is intended for a different purpose from that covered by the present invention.
The object of the device described in British Patent B-1 235 481 also differs from that of the present invention. Moreover, its design and its mode of operation are liable to produce many interfering harmonic vibrations which risk giving rise to incorrect commands.
The documents FR-A-2 074 678 and FR-A-2 138 217 have disclosed remote control devices which use the telephone network as a transmission medium and which make it possible to transmit signals in both directions between two stations. However, these devices, the first of which incorporates a manual reversing key, have a design tending to produce harmonic vibrations which risk giving rise to incorrect commands. Moreover, the system for coding the instructions is such that the least distortion of the message results in an incorrect interpretation of the instruction. This type of device is therefore unsuitable for uses where high operating reliability is required.
Centralized remote control devices are also known which use the high-voltage and low-voltage network as a transmission medium. Because of their operating principle and their basis of construction, these devices do not allow signals to be transmitted in the opposite direction.
It is therefore established that there is a need for providing remote control devices which work with good operating reliability to allow uses, such as, for example, the remote control of valves or circuit-breakers, whilst using a public telephone line. The aim is, therefore, to avoid the need to use one or more private or special telephone lines intended for the transfer of complex and numerous data, such as, for example, an interconnection between computers.
SUMMARY OF THE INVENTION
The object of the present invention is consequently to provide a simple remote control device which uses the ordinary telephone network as a transmission medium and which makes it possible to transmit signals in both directions between two locations equipped with conventional telephone stations.
The object of the present invention is achieved by means of a remote control device which uses the telephone network as a transmission medium and which makes it possible to transmit signals in both directions between two stations, and which consists of a master station giving instructions and connected to a first telephone station and of a subordinate station which receives and executes the instructions and signals the execution of the instructions and which is connected to a second telephone station, the communication between these two stations making use alternately of only a single telegraph channel for outgoing transmission and for incoming transmission, and wherein the telephone line connecting the two stations is an ordinary telephone line serving for conversation between two persons.
The device according to the invention has the advantage that it is simple and therefore inexpensive. It can also be installed by beinq connected to any telephone station and can be used both on an industr1al scale and 1n the private sector, that is to say in the home, to control operations such as, for example, the heating of a second residence.
According to an advantageous embodiment of the present invention, the master station comprises a suitable number of control switches connected to a multiplexer and an address coder, a frequency generator producing two frequency level
REFERENCES:
patent: 4095050 (1978-06-01), Beachem et al.
patent: 4121053 (1978-10-01), Dick
patent: 4174064 (1979-11-01), Pratt, Jr.
patent: 4206444 (1980-06-01), Ferlan
patent: 4266097 (1981-05-01), Cannon et al.
Association Intercommunale d'Electricite du Sud du Hainaut
Brady W. J.
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