Digital multi-channel simulcast system with centralized timestamping device
First Claim
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1. A digital simulcast communication system supporting multiple radio channels, comprising:
- a plurality of transmitters;
a primary centralized simulcast launch timestamp server including a single time reference source for assigning launch timestamps to inbound packets to generate a corresponding number of timestamped outbound packets, each inbound packet corresponding to a given one of said multiple radio channels;
a communication packet-switched network for distributing each of the timestamped outbound packets to predetermined ones of said plurality of transmitters on the basis of the radio channel corresponding thereto; and
a comparator site network coupled to said packet-switched network for generating said inbound packets;
wherein said comparator site network includes a plurality of packet voting servers, each for voting inbound source signals over a corresponding one of said multiple radio channels to generate a respective one of said inbound packets, and a voting controller for sourcing said inbound packets to said packet-switched network.
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Abstract
In a digital multi-channel simulcast system, a redundant centralized timestamping device acts as a simulcast controller for multiple channels simultaneously. All packets within a regional multi-channel system which require simulcast transmission are sent to a central timestamping device which determines the appropriate launch timestamp for each packet and attaches it thereto. The timestamping device is able to support concurrent timestamping sessions for each channel of a multiple channel system and can be dynamically assigned (trunked) to service any given radio channel on a packet by packet, call by call, or less frequent basis.
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Citations
12 Claims
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1. A digital simulcast communication system supporting multiple radio channels, comprising:
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a plurality of transmitters; a primary centralized simulcast launch timestamp server including a single time reference source for assigning launch timestamps to inbound packets to generate a corresponding number of timestamped outbound packets, each inbound packet corresponding to a given one of said multiple radio channels; a communication packet-switched network for distributing each of the timestamped outbound packets to predetermined ones of said plurality of transmitters on the basis of the radio channel corresponding thereto; and a comparator site network coupled to said packet-switched network for generating said inbound packets; wherein said comparator site network includes a plurality of packet voting servers, each for voting inbound source signals over a corresponding one of said multiple radio channels to generate a respective one of said inbound packets, and a voting controller for sourcing said inbound packets to said packet-switched network. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12)
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6. A digital simulcast communication system supporting multiple radio channels, comprising:
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a plurality of transmitters; a primary centralized simulcast launch timestamp server including a single time reference source for assigning launch timestamps to inbound packets to generate a corresponding number of timestamped outbound packets, each inbound packet corresponding to a given one of said multiple radio channels; a communication packet-switched network for distributing each of the timestamped outbound packets to predetermined ones of said plurality of transmitters on the basis of the radio channel corresponding thereto; and a comparator site network coupled to said packet-switched network for generating said inbound packets, said comparator site network including a plurality of packet voting servers, each for voting inbound source signals over a corresponding one of said multiple radio channels to generate a respective one of said inbound packets, and a voting controller for sourcing said inbound packets to said packet-switched network. - View Dependent Claims (7, 8, 9)
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Specification