Time-division multiplex communications control system

• US 4,630,263 A
• Filed: 07/07/1983
• Issued: 12/16/1986
• Est. Priority Date: 07/07/1983
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Scavezze, Daniel C., Marten, Russell A., Henderson, James A. Jr., Townsend, Greg M.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Scutch, III, Frank M.
• Application Number:
  US06/511,692
• Time in Patent Office: 1,258 Days
• Field of Search: 370/85, 370/92, 370/96, 340/825.08, 340/825.5
• US Class Current: 370/449
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

Method and apparatus are provided for bi-directional audio and data communications enabling a time-division multiplex control center system and distributed system intelligence enabling efficiency and reliability.

Claims

1. A communications control center system for bi-directional audio and data transfer on a TDM bus coupled between a plurality of nodes comprising:

(a) means for receiving analog audio signals from each of a plurality of sources coupled to the respective nodes, said receiving means including means for converting said analog audio signal to a digital audio signal;

(b) time-division multiplex means coupled to each of the respective nodes for sending said digital audio signals to designated sources and for defining recurrent time slots with one of said recurrent time slots corresponding to each of the respective nodes and at least one recurrent time slot being uniquely dedicated for data transfer between each of the respective nodes;

(c) outputting means at each of said respective nodes coupled to said time-division multiplex means for removing said digital audio signal from said time slot and means for converting said digital audio signal to analog audio signal; and

(d) means for controlling data transfer on said dedicated data slot, wherein said means for controlling data transfer on said dedicated data slot including means for sequentially polling the plurality of nodes, means for receiving a data request signal from a requesting node, means for granting control of said dedicated slot and means for simultaneously disabling said means for sequentially polling for a predetermined period of time, means for enabling said means for sequentially polling at the next slot following said requesting node whereby each of the nodes is provided equal access to said dedicated data slot.

2. The apparatus according to claim 1 wherein said means for receiving analog audio signals from each of a plurality of sources includes separate receiver means corresponding to each of the plurality of nodes.

3. The apparatus according to claim 1 wherein said means for converting analog audio signal to a digital audio signal further comprises time slot control means.

4. The apparatus of claim 1 wherein said time-division multiple means includes timing means to define each of the time slots and address means relating each of the nodes to a particular time slot.

5. The apparatus as claimed in claim 1 including control means and memory means.

6. The apparatus as claimed in claim 5 wherein said control means and memory means include at least one microprocessor unit, random access memory means and read only memory means.

7. The apparatus according to claim 1 wherein said means for receiving said digital audio signal at designated nodes includes means for enabling selected nodes.

8. The apparatus as claimed in claim 1 wherein said means for controlling data transfer on said dedicated data slot includes microprocessor means and memory means.

9. A method for bi-directional audio and data transfer between a plurality of nodes comprising:

(a) receiving an analog audio signal from any of the plurality of sources, each separately coupled to a respective one of the plurality of nodes;

(b) generating recurrent time slots and assigning each of the plurality of nodes to a respective recurrent time slot with at least one time slot assigned exclusively for data transfer between the plurality of nodes;

(c) converting said analog audio signal to a digital audio signal and inputting the same to said time-division multiplex means;

(d) outputting said digital audio signal from said time-division multiplex means and converting said digital audio to an analog audio signal;

(e) sending said converted signal to designated sources; and

(f) controlling said dedicated data slot to provide each of the nodes equal access to transfer data between the nodes on said dedicated data slot for predetermined periods of time, wherein each node is granted access to its dedicated data slot for the predetermined period of time.

10. The method as claimed in claim 9 wherein the steps of sending said digital audio signal to designated sources:

(a) includes enabling receiver means at designated nodes to receive said digital signal.

11. The method as claimed in claim 9 wherein the step of controlling said dedicated data slot to provide each of the nodes equal access to transfer data between the nodes on said dedicated data slot includes:

(a) sequentially polling the plurality of nodes;

(b) receiving a data request signal from a requesting node;

(c) granting control of said dedicated data slot and simultaneously inhibiting said polling for a predetermined period of time;

(d) resuming sequentially polling with the next node following said predetermined period of time.