RADIO SYSTEM WITH UNIVERSAL COMMUNICATION INTERFACE

Abstract: A radio system comprises a radio (1) having a transmit mode activated by a press to talk (PTT) switch (16) mounted on a universal communication interface (12) for mounting on a radio interface (6) associated with the radio (1). The radio interface (6) may or may not form part of the radio (1) and a plurality of radio interfaces may be provided for different applications, such that a standard universal communication interface (12) can be used with different types of equipment.

Description: RADIO SYSTEM WITH UNIVERSAL COMMUNICATION INTERFACE The present invention relates to a radio system and particularly, but not exclusively, to a system employing what are commonly known as a personal role radios as typically carried by members of the armed forces or organisations such as the police. Here there is often a requirement for an individual to have a personal role radio to permit two way communication. Conventional two way radios operate in either duplex or simplex mode, the duplex mode is similar to a telephone system where the receive and transmit paths are both open and both parties can speak to each other with no other requirement. The more common operation is simplex where the transmit path of each radio only works when the transmitter is keyed by the operation of a "press to talk switch" (PTT). The types of switch used vary and can be either part of a microphone as in the case of the hand held types in common use, or a switch box in a lead between the radio and a headset, as used in commercial and operational headsets. Operators often have to operate a radio transmit switch while using their hands to do other things and certain systems incorporate voice activation where the radio is switched at the detection of the users voice from the microphone. This technique is not reliable with some applications and the need for a switch actuated by the user is still the only reliable means of controlling the radio. According to the present invention there is provided a radio system comprising a radio having a transmit mode and a press to talk (PTT) switch to set the radio to a transmit mode, wherein the system further comprises a radio interface associated with the radio and a universal communication interface (UCI) in which the PTT switch is located, the radio interface being arranged to releasably mount said UCI and provide communication between the UCI and radio when mounted thereon. By employing the present invention and having a universal communication interface (UCI), on which the PTT switch is located and which UCI can be releasably mounted on a radio interface, it is possible to utilise a standard UCI and associated PTT switch for several applications. This is particularly advantageous in applications, for example with the Police or Military, where it enables one single switch type to be common to a number of applications. This simplifies provision of the UCI, spares for the UCI, the number of lead termination types required on auxiliary equipment, such as headset, and the amount of training required for operators, for regardless of what radio they may be using if it has a UCI the control principles are the same. More importantly once an operative has trained on the UCI and that UCI type is common to all radios, there is less likelihood of incorrect PTT switch operation caused by being unfamiliar with an equipment type as may occur whilst the operative is concentrating on objectives other than operation of the radio. Preferably the system comprises a variety of radio interfaces which can each receive the UCI, whereby interfaces can be modified to particular applications. Particular mountings maybe required for certain types of vehicle or for where a radio is to be worn by the operator. Radio interfaces may be of different types, being application specific and arranged to connect to different types of radio or to be mounted in different locations. That is to say the interface to the UCI is common whilst the mounting of the radio interface or any leads from the radio interfaces can be application specific. The radio interface may be mounted directly on the housing of the radio, which is particularly advantageous where the radio is a personal role radio carried, normally by being strapped, to an operative. Here the radio and UCI may form one complete unit with no need for any auxiliary wiring between the two. A headset and lapel microphone or similar may be connected to the UCI in the normal manner. In an alternative embodiment the radio interface may be a remote interface located away from the radio but connect thereto by a physical communication link, either a wire or optical fibre. This may be of particular advantage if the radio is for example a large radio mounted in a vehicle for this enables the radio to be mounted at any location within the vehicle. The operative may then have the UCI mounted on its remote radio interface at a location convenient to the operative, or the radio interface may even be worn by the operative. In certain applications, particularly military applications, there is a requirement for a personal role radio to communicate locally by two way radio, but the operative may also need to be connected to a different radio network, for example a combat network radio. In this scenario the UCI is particularly advantageous if arranged to be connected to a personal role radio by means of the radio interface and to be connected to a second radio by means of a wire or optical link. It is then particularly advantageous that the UCI has two PTT switches mounted thereon, one associated with each radio network. In some applications it is required that there is no possibility of cross-communication between different radio networks. The UCI may thus contain circuitry to ensure no cross- communication can occur between at least one transmission and one reception signal associated with different radio networks by closing one channel (normally a transmit channel when a receive channel is in use). The system of the invention may additionally comprise a wired remote PTT module having a PTT switch, which module is small relative to the UCI, the UCI having a connection for the wire to the remote PTT switch. This enables the function of the PTT switch of the UCI to be operated remotely of the UCI, enabling the remote PTT module and associated switch to be mounted at a location convenient to the operative, for example on the handlebars of a motorbike. As an alternative to, or in addition to, the small wired remote PTT module the system may further comprise a cordless remote PTT module comprising a PTT switch, the remote module additionally comprising a short range, relative to the radio, cordless transmitter. The UCI then additionally comprises a receiver for receiving signals from the remote module to remotely activate the function of the PTT switch of the UCI. This is particularly advantageous for no matter whether the UCI is mounted to a personal role radio or to a remote radio interface, possibly mounted to a vehicle, the operative has the means of operating that UCI and the associated radio remotely by means of the remote module. The short range transmission may be infra-red but preferably is by way of a radio transmitter. Preferably where the UCI has two PTT switches associated with two different radio networks the remote module comprises two PTT switches associated with the two radio networks. Advantageous the signal transmitted from the remote module comprises a code to which the receiver of the UCI is responsive thereby ensuring the correct signal is received by the UCI avoiding inadvertent operation when a number of remote modules are operated by respective individuals in close proximity. The receiver of the UCI is advantageously responsive to a variety of codes associated with different remote modules. This may be particularly advantageous where the UCI is associated with an operative who may operate several pieces of equipment each fitted with a remote module. The operative can thus operate any piece of equipment associated with a remote module and effectively activate the PTT switch of his UCI via the remote module associated with a respective piece of equipment. Advantageously the receiver of the UCI has a 'learn' mode in which the UCI can learn a code associated with a remote module. This is particularly advantageous for if the operative loses a remote module, or a remote module is damaged the module can be replaced by a new module having a different pre-programmed code which can then be learnt by the UCI. It is preferable that the UCI learn the code of the module rather than the remote module learn any code associated with the UCI for in this way no receiver is required by the remote module as it only needs to transmit code. Preferably the UCI of the system comprises a magnetically operated switch and the remote module comprises a magnet, the magnet and magnetically operated switch being arranged such that the magnetically operated switch is caused to adopt a 'learn' mode position when the remote module, including said magnet, is held in an appropriate position relative to the magnetically sensitive switch, in which position activation of the PTT switch on the remote module causes the UCI to learn the code transmitted by the remote module. By pressing the PTT switch on the remote module a number of times or for period in excess of a predetermined period one or more codes can be removed from the UCI so that the UCI is no longer responsive to those codes. Typically such action would clear all the codes from the UCI which would then re-learn the desired code. One embodiment of the present invention will now be described by way of example only with reference to the accompanying figures of which: Figure 1A is a perspective view of a personal role radio in accordance with the present invention; Figure IB is a perspective view of a universal communication interface (UCI) in accordance with the present invention; Figure 2 is a perspective view of a remote radio interface; Figure 3 shows the assembled apparatus of Figure IB and 2; Figure 4 shows the assembled apparatus of Figures 1A and Figure IB with auxiliary components; Figure 5 illustrates an alternative universal communication interface with self-contained speaker and microphone; Figure 6 illustrates the various communications equipment that interfaces with the universal communication interface of Figure IB; Figure 7A schematically illustrates the primary components within the remote module illustrating Figure 6; and Figure 7B illustrates the primary components of the UCI of Figure IB and Figure 6 which relate to remote operation of the UCI by means of the remote module of Figure 7A. Referring now to Figure 1, a personal role radio is illustrated generally as 1, having a casing 2, a battery compartment cover 3, operating controls 4 and 5, and an end face constituting a radio interface 6. The interface 6, has a fitting slot 7, fitting thread 8 and electrical interconnects 9, 10 and 11. The personal role radio 1 comprises an aerial, (which is internal on the embodiment illustrated), a transmitter and receiver by which it may send and receive radio signals. The personal role radio is designed to be carried by an operative and would typically be carried on a belt or could be mounted in close proximity to the operative, for example on a vehicle associated with the operative. The radio interface 6 is designed to receive the universal communication interface (UCI) indicated generally as 12 in Figure IB. The UCI 12 comprises a stud not shown and screw 13 which co-operate respectively with fitting slot 7 and fitting thread 8 to hold the UCI housing 14 in position. The UCI 12 comprises a headset connector 15, push to talk (PTT) buttons 16 and 17 respectively associated with two different radio networks and two slots , only one 18 of which is shown, for receiving optional cable connections. The switches 16 and 17 are depressed in order to talk to respective communication networks through respective radios, one button 16 is associated with the personal role radio 1 of Figure 1A, while button 17 is associated with a external radio network, which may be a combat network radio where the radio system is employed in a military application. The universal communication interface comprises circuitry to ensure that when a signal is being received on one communication network the press to talk function controlled by the button associated with the other network cannot be activated. This ensures that a radio signal being received and transmitted to a user, possibly by means of a headset, cannot inadvertently be picked up by the open microphone and simultaneously transmitted on the other radio network. When the radio of Figure 1A is mounted to the UCI of Figure IB and an appropriate headset or speaker/microphone are connected to the UCI there is a self-contained personal role radio which may be carried by an operative, the radio interfacing with the universal communication interface via contacts 9 and corresponding contacts (not shown) on the universal communication interface 12. There are applications where it is not convenient for the operative to carry the personal role radio, or where the operative may wish to use another radio, perhaps mounted in a vehicle. Indeed the operative may wish to mount his personal role radio within a vehicle. This is facilitated by the remote radio interface 19 of Figure 2 which is identical to the interface 6 on the personal role radio on Figure 1 A, but instead of being part of that personal role radio is now a stand alone interface which may be connected to another radio which could be mounted on board a vehicle, aircraft, boat etc, or a large man-pack infantry radio, by means of connection lead 20. The remote radio interface 19 comprises the same physical and electrical connections as the interface 6 and thus the UCI can be mounted to the remote radio interface 19 as shown in Figure 3. Referring now to both Figures IB and Figure 3, slot 18 in the UCI 12 may receive a cable with contacts on a spade which connect to contacts 10. A corresponding slot (not shown) on the other side of the UCI permits a similar cable with contacts to connect with the contacts 11 on the interface 6 or 19. These additional leads are illustrated in Figure 4, lead 21 being connected and lead 22 shown disconnected in order to illustrate contact spade 23 which connects to contacts 11 of figures 1A and 2. In the arrangement shown in Figure 4, the UCI 12 is mounted on the personal role radio 1 but could equally be connect to the remote radio interface 19 of Figure 2, as shown in Figure 3. Lead 21 may be connected to an auxiliary radio depending on the application, whilst leads 22 connects remote switches 24 and 25, corresponding to press to talk switches 16 and 17 to the UCI 12. The additional switches 24 and 25 may be located at a position convenient to an operative for example, on the handlebars of a motorcycle or quad bike or on the stock of a rifle. This permits the radio to be operated without the operative needing to remove his hands from the controls of the vehicle or from a gun he his carrying. Alternatively, depending on the application, this function may be satisfied simply by having the UCI 12 mounted on the remote radio interface 19 as shown in Figure 3 and having the complete unit then mounted at an appropriate location, either on a vehicle or perhaps on a chest holster worn by an operative. It will be realised that there are any number of permutations which a remote universal communication interface 12 permits. Referring now to Figure 5, there is illustrated a variation of the universal communication interface of Figure IB. Here UCI 26 incorporates a microphone 27 and speaker 28 such that it can be operated without a headset. In the embodiment illustrated there is only a single push to talk switch 29 but this is a matter of design choice. The UCI 26 interfaces with the personal role radio 1 of Figure 1A, or the remote radio interface as illustrated in Figure 2, in exactly the same manner as the UCI 12 illustrated in Figure IB. Both UCI's 12 and 26, illustrated respectively in Figures IB and Figure 5, incorporate a radio receiver, (which could equally be an infra-red receiver). The function of this receiver is described below with reference to Figure 6 where, for illustrative purposes only, the UCI 12 of Figure IB is shown connected to a headset, illustrated generally as at 30 having headphones 31 and a microphone 32 located on a stalk which when worn by an operative is in front of the operatives mouth. In the embodiment illustrated in Figure 6 the UCI 12 is mounted on the remote radio interface 19 previously described with reference to Figure 2. The radio system additionally comprises a cordless remote press to talk (PTT) module 33 having a PTT switch 34 thereon and a magnet 35, located adjacent the wall of the casing 36 of the remote module 33. The remote module 33 comprises a low power transmitter arranged such that operation of the PTT switch 34 causes a signal 37 to be transmitted to the UCI 12 which when received by the receiver (not shown) of the UCI 12 the UCI functions as though the PTT switch (16) had been depressed. The function of the remote module is described below in more detail with reference to Figures 7A and 7B, however it should be noted that although only one PTT switch 34 is illustrated on the remote module 33, in order to simplify the description, the module 33 could comprise two switches corresponding to the switches 16 and 17 of the UCI if the module is desired to be used with a UCI designed to operate with two networks. Referring to Figure 7A the remote module 33 is shown schematically to comprise a battery 37 connected by PTT switch 34 to transmit circuit 38. When the switch 34 is depressed the battery is connected to the transmit circuit which retrieves a code from EPROM 39. This code is effectively unique to the remote module and is transmitted in a signal via antenna 40 to receiving antenna 41 housed within the UCI 12 illustrated schematically in Figure 7B, with the function of only one PTT switch 16 illustrated for clarity. Referring to Figure 7B the PTT switch 16 connects the microphone 32 to the personal role radio 1. (The communication path to the headphones 31 has been omitted for clarity). Although the headset is shown connected via UCI 12 to personal role radio 1 the radio could be any radio. The microphone 32 may be connected to the personal role radio 1 by means of switch 16 or by means of signal received by receiver 42 via antenna 41. The receiver 42 when receiving the correctly coded signal closes switch 43. It should be noted here that although Figure 7, and description thereof, talks about opening and closing switches and the switches are illustrated as being physical switches contained within the UCI 12, in practice this function may be achieved electronically and indeed may be achieved by generating an appropriate signal to the transmitter contained within the radio 1. In order that the receiver 42 may learn the code which the remote module 33 will transmit, the remote module 33 may be held adjacent the UCI 12 with magnet 35 adjacent a magnetically sensitive reed switch 44 in the receiver. With the magnet 35 adjacent the reed switch 44, the reed switch closes setting the receivers circuit to a 'learn' mode. An operative depressing the PTT switch 34 of the remote module 33 causes the code stored therein to be transmitted from the remote module 33 to the receiver 42, which code is then stored in memory in the receive circuit 42 and subsequently recognised as an appropriate code. The receiver 42 may learn a number of codes such that it is responsive to signals from a corresponding number of remote units. To reset the receiver and wipe out all stored codes the magnet is held adjacent the reed switch and the PTT switch 34 of the remote module 33 pressed five times in quick succession. The receiver circuit 42 is programmed to recognise this as a 'clear all codes' signal. Alternatively the receiver could be programmed to recognise a signal lasting longer than a set duration. It will be realised that apparatus in accordance with the invention may have any number of applications and the particular applications are outside the scope of the present specification. However for illustrative purposes a brief reference to one application of the invention is given below with reference to a rider of a Police motorcycle. The Police rider would typically have a personal role radio mounted upon his person complete with a headset and UCI, the UCI either being mounted directly to the radio or perhaps strapped to his chest. The advantage of this is that whether on the bike or dismounted the Police rider carries his complete radio system with him. However whilst riding the bike it is not desirable to let go of the controls and therefore the remote module 33 may be mounted at a convenient location on the handlebars of the bike. Thus when the rider wishes to reply to a communication he can simply push the button 34 and speak into the microphone. On leaving the bike he leaves the remote module 33 on the bike but can communicate by pressing PTT button 16 on the UCI 12. The rider may ride a number of bikes and a particular bike may be ridden by a number of riders. Here the rider can program the receiver of his UCI with the code of all the bikes or vehicles he rides (cars he drives) so that a remote module mounted on any one of those vehicles will operate his particular radio. When he gets on to a bike he has not ridden before, he simply places his UCI 12 adjacent the remote module 33 of that bike such that the code of that remote module is then stored in the receiver of his UCI. It would be possible for the remote module 33 to have a receiver and receive codes transmitted from the UCI, however this requires an extra receiver in the remote module 33 and transmitter in the UCI 12. Also it will be realised that a learning mode may be generated other than by magnet 35 for example a screwdriver could be placed in a small hole to operate a switch equivalent to the magnet 35 operating reed switch 43. The above describes one way in which the present invention may be employed. However numerous other implementations and applications will occur to those skilled in the art which are within the scope of the appended claims.

Claims: CLAIMS 1. A radio system (1, 12, 19, 33) comprising a radio (1) having a transmit mode and a press to talk (PTT) switch (16) to set the radio to a transmit mode, characterised in that the system further comprises a radio interface (6, 19) associated with the radio and a universal communication interface (UCI) (12) in which the PTT (16) switch is located, the radio interface (6, 19) arranged to releasably mount said UCI (12) and provide communication between the UCI (12) and radio (1) when mounted thereon. 2. A system as claimed in claim 1 comprising a plurality of radio interfaces (6, 19) which can each receive the UCI (12). 3. A system as claimed in claim 2 wherein the plurality of radio interfaces (6, 19) are of different types, being application specific and arranged to connect to different radio types and/or be mounted in different locations. 4. A system as claimed in any preceding claim wherein the radio interface (6) is on the housing of the radio (1). 5. A system as claimed in any one of claims 1 to 3 wherein the radio interface (19) is a remote interface located away from the radio (1) but connected thereto by a physical communication link (20), either a wire or optical fibre. 6. A system as claimed in claim 5 wherein the radio interface (19) is arranged to be worn by the operator. 7. A system as claimed in any preceding claim wherein the radio (1) is a personal role radio arranged to be worn by the operator. 8. A system as claimed in one of claims 1 to 6 wherein the radio (1) is arranged to be mounted on a vehicle. 9. A system as claimed in any preceding claim wherein the UCI (12) is arranged to be connected to said radio (1) by means of the radio interface (6, 19) and to be connected to a second radio by means of a wire or optical link (21). 10. A system as claimed in claim 9 wherein said wire or optical link (21) is arranged to terminate in a manner such that mounting the UCI (12) on the radio interface maintains the wire or optical link in contact with the UCI (12). 11. A system as claimed in claim 9 or 10 wherein said radio is a personal role radio (1) and said second radio is a network radio. 12. A system as claimed in any preceding claim wherein the UCI (12) has two PTT switches (16, 17) mounted thereon, one associated with a first radio (1) and the second associated with a separate radio network. 13. A system as claimed in claim 12 wherein the UCI (12) contains circuitry to prevent cross connection between at least one transmission and one reception signal associated with different radios. 14. A system as claimed in claim 12 or 13 wherein the first radio (1) is a personal role radio and the second radio is a combat network radio. 15. A system as claimed in any preceding claim wherein the UCI (12) comprises a connection (15) for an operator headset. 16. A system as claimed in any preceding claim further comprising a wired remote PTT module having a PTT switch (24, 25) which module is small relative to the UCI (12), the UCI having a connection for the wire (22) of the remote PTT switch so that the function of the PTT switch (16) of the UCI can be operated remotely of the UCI (12). 17. A system as claimed in any preceding claim further comprising a cordless remote PTT module (33) comprising a PTT switch (34), the remote module (33) comprising a short range, relative to the radio, transmitter (38), the UCI (12) comprising a receiver (42) for receiving signals from the remote module (33) to remotely activate the function of the PTT switch (16) of the UCI (12). 18. A system as claimed in claim 17 wherein the short range transmitter (38) is a radio transmitter. 19. A system as claimed in claim 17 wherein the short range transmitter is an infra-red transmitter. 20. A system as claimed in any one of claims 17 to 19 wherein the remote module (33) comprises two PTT switches associated with different radio networks. 21. A system as claimed in any one of claims 17 to 20 wherein a signal (37) transmitted from the remote module (33) comprises a code and the receiver of the UCI is responsive to the code. 22. A system as claimed in claim 21 wherein the receiver (42) of the UCI (12) is responsive to a plurality of codes associated with different remote modules (33). 23. A system as claimed in claim 21 or 22 wherein the receiver (42) has a learn mode in which it can learn the codes of a remote module. 24. A system as claimed in claim 23 wherein the UCI (12) comprises a magnetically operated switch (43) and the remote module (33) comprises a magnet (35), the magnet and magnetically operated switch being arranged such that the magnetically operated switch is caused to adopt a learn mode position when the remote module including said magnet is held in an appropriate position relative to the magnetically sensitive switch, in which position activation of the PTT switch (34) on the remote module (33) causes the UCI (12) to learn the code of the remote module. 25. A system as claimed in any one of claim 24 wherein depressing the PTT switch on the remote module (33) a number of times or for a period in excess of a predetermined period causes one or more codes to be removed from the UCI (12) so that the UCI is no longer responsive to those codes. 26. A Universal communications interface (UCI) (12) for a system as claimed in any preceding claim. 27. A personal role radio (1) comprising a radio interface (6) for a system of any preceding claim. 28. A cordless remote module (33) for a system as claimed in any one of claims 17 to 25. 29. A radio system substantially as hereinbefore described and/or as illustrated in one or more of the accompanying figures.

Inventors: DAVIES JOHN, DAVIES, JOHN
Applicants: DAVIES IND COMM LTD, DAVIES JOHN, DAVIES INDUSTRIAL COMMUNICATIONS LIMITED, DAVIES, JOHN
Application year: 2000
Main classification: H04B1
IPC codes: H04B1, H04B7, H04M1