Communication apparatus
First Claim
Patent Images
1. A communication system, comprising:
- a plurality of transmitters, each transmitter being activatable to broadcast any selected one of a plurality of different predetermined coded service request messages along a communication channel;
message selector means associated with each transmitter for selecting any one of the plurality of predetermined coded service request messages, and activating the associated transmitter to broadcast the selected service request message;
a plurality of portable slave receivers, each slave receiver being configurable to receive only from a selected subset of said plurality of transmitters said broadcast predetermined coded service request messages transmitted along the communication channel from said selected subset of transmitters; and
portable display means associated with each slave receiver, the display means being arranged to display indicia representative of codes contained in the coded service request messages received by the slave receiver.
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Abstract
A communication apparatus comprises a network of transmitters and receivers communicating with each other by means of UHF radio frequency signals. Each transmitter is linked to one or more associated receivers and can be individually activated to transmit a selected one of a number of different predetermined messages to its associate receivers along a corresponding communication channel. Each transmitter is activatable by means of a respective message selector which enables a user thereof to select the predetermined message to be transmitted by the transmitter.
15 Citations
24 Claims
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1. A communication system, comprising:
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a plurality of transmitters, each transmitter being activatable to broadcast any selected one of a plurality of different predetermined coded service request messages along a communication channel;
message selector means associated with each transmitter for selecting any one of the plurality of predetermined coded service request messages, and activating the associated transmitter to broadcast the selected service request message;
a plurality of portable slave receivers, each slave receiver being configurable to receive only from a selected subset of said plurality of transmitters said broadcast predetermined coded service request messages transmitted along the communication channel from said selected subset of transmitters; and
portable display means associated with each slave receiver, the display means being arranged to display indicia representative of codes contained in the coded service request messages received by the slave receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of communication, comprising the steps of:
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selecting, by means of a message selector means, a selected one of a plurality of different predetermined coded service request messages to be transmitted from a transmitter;
establishing an association between said transmitter and at least one receiver such that messages transmitted from said transmitter are received only by said at least one receiver;
activating said transmitter to broadcast the selected service request message along a communication channel;
receiving the broadcast coded service request message at each receiver associated with said transmitter; and
displaying, on a portable display means associated with said receiver, indicia representative of codes contained in the coded service request message received by the slave receiver. - View Dependent Claims (19, 20, 21, 22, 23, 24)
receiving the broadcast coded service request message at a master receiver; and
displaying, on a display means associated with the master receiver indicia representative of codes contained in the coded service request message received by the master receiver.
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23. A method as claimed in claim 18 which includes the further step of buffering in the slave receiver codes contained in a plurality of broadcast coded service request messages received by the slave receiver from the transmitters to which the slave receiver is responsive.
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24. A method as claimed in claim 22 which includes the further step of buffering in the master receiver codes contained in a plurality of broadcast coded service request messages received by the master receiver from all of the plurality of transmitters.
Specification