Digital radio telephone system
First Claim
1. A telephone key system to operate a plurality of radio handsets, said system connecting to an external telephone system for telephonic communications with telephone systems and users external to the telephone key system, said telephone key system operating at predetermine frame rate at which voice is transmitted to the external telephone system, said telephone key system comprising:
- a central control unit (CCU) comprising;
an external telephone interface which connects to the external telephone system;
at least one radio frequency (RF) interface comprising at least one radio transceiver to transmit voice and command data between the radio handsets and the CCU;
a time slice bus which interconnects devices connected to the bus comprising the external telephone interface and RF interface to provide the transfer of voice data between devices and the transmission of voice data between the external telephone system and the handsets,bus controlling means for controlling the operation of the bus, said bus controlling means comprising,a clock means for dividing the frame into a plurality of slots whereby a unit of voice data can be transferred between a source device which outputs voice data onto the bus during a slot and a destination device, which receives voice data output onto the bus during a slot;
source and destination device identification means for identifying the source and destination devices for each time slot used; and
bus processing means for reading the identification of source and destination devices for each time slot and enabling the corresponding source and destination devices such that the source device puts data onto the bus and the destination device latches the data from the bus during the corresponding time slot;
wherein the bus controlling means controls the operation of the time slice bus of the CCU such that the radio handsets communicate to the external telephone system through the CCU on a real time basis.
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Accused Products
Abstract
The telephone system of the present invention is realized by a unique dynamic time slice architecture which allows for up to 480 transfers of data. A dual port RAM is utilized in which are stored two pages of data, containing time slice information identifying the sending and receiving devices for each time slice slot within the frame. The time slice configuration can be easily modified to accommodate a change in the current system configuration, for example, a handset connecting or disconnecting from a central office line, or the initiation of a conference call. The time slice configuration is modified by updating the second page and swapping the two pages at the beginning of the next frame so that the time slice controller accesses the second page and the configurations specified therein. Thus the system can be updated and controlled in real time with no delays to the users of the telephone system. The telephone system of the present invention further provides a dynamic conferencing capability which can accommodate a large number of users with no additional circuitry and little additional system overhead. The conferencing circuit linearly combines digitized audio data received from different sources over successive time slice slots in a single frame on a real time basis wherein parties can be added or removed simply by adding or removing the connections to the time slice slots.
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Citations
19 Claims
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1. A telephone key system to operate a plurality of radio handsets, said system connecting to an external telephone system for telephonic communications with telephone systems and users external to the telephone key system, said telephone key system operating at predetermine frame rate at which voice is transmitted to the external telephone system, said telephone key system comprising:
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a central control unit (CCU) comprising; an external telephone interface which connects to the external telephone system; at least one radio frequency (RF) interface comprising at least one radio transceiver to transmit voice and command data between the radio handsets and the CCU; a time slice bus which interconnects devices connected to the bus comprising the external telephone interface and RF interface to provide the transfer of voice data between devices and the transmission of voice data between the external telephone system and the handsets, bus controlling means for controlling the operation of the bus, said bus controlling means comprising, a clock means for dividing the frame into a plurality of slots whereby a unit of voice data can be transferred between a source device which outputs voice data onto the bus during a slot and a destination device, which receives voice data output onto the bus during a slot; source and destination device identification means for identifying the source and destination devices for each time slot used; and bus processing means for reading the identification of source and destination devices for each time slot and enabling the corresponding source and destination devices such that the source device puts data onto the bus and the destination device latches the data from the bus during the corresponding time slot; wherein the bus controlling means controls the operation of the time slice bus of the CCU such that the radio handsets communicate to the external telephone system through the CCU on a real time basis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. In a telephone key system to operate a plurality of radio handsets, said system connecting to an external telephone system for telephonic communications with telephone systems and users external to the telephone key system, said telephone key system operating at a predetermine frame rate at which voice is transmitted to the external telephone system, said telephone key system comprising a central control unit (CCU) having an external telephone interface which connects to the external telephone system and at least one radio frequency (RF) interface comprising at least one radio transceiver to transmit voice and command data between the radio handsets and the CCU, a method for communicating comprising the steps of:
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providing a time slice bus which interconnects devices connected to the bus comprising the external telephone interface and RF interface dividing the frame into a plurality of slots; identifying the source and destination devices for each time slot used; enabling the corresponding source and destination devices such that the source device puts data onto the bus and the destination device latches the data from the bus during the corresponding time slot; transferring data between a source device which outputs voice data onto the bus during a slot and a destination device, which receives voice data output onto the bus during a slot; and wherein voice data is transmitted between devices and the voice data is transmitted between the external telephone system and the handsets on a real time basis. - View Dependent Claims (18, 19)
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Specification