Browse Prior Art Database

DIGITAL AUDIO INTERCONNECTING SYSTEM

IP.com Disclosure Number: IPCOM000006239D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-17
Document File: 1 page(s) / 61K

Publishing Venue

Motorola

Related People

Vijay Nadkarni: AUTHOR [+3]

Abstract

A requirement of the new generation of Smart Repeater trunking systems is for repeaters in a net- work to be able to freely exchange their audio signals, with minimal call set up time or effort.

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MOTOROLA INC. Technical Developments Volume 13 July 1991

DIGITAL AUDIO INTERCONNECTING SYSTEM

by Vijay Nadkarni, Mark Shaughnessy and Lynn Monica

  A requirement of the new generation of Smart Repeater trunking systems is for repeaters in a net- work to be able to freely exchange their audio signals, with minimal call set up time or effort.

  The network invented to accomplish this consists of N repeaters (N usually being 30 or less) that are linked to one another, as shown in the accompanying figure. Two serial buses connect the repeaters, in a point-to-point chain, carrying signals in opposing directions. These buses carry a continuous stream of time-division-multiplexed frames (usually 2.048 Mb/s or 1.544 Mb/s) and allow pairs of repeaters to commu- nicate their audio in a full duplex fashion. A frame travelling from left to right originates with the left- most repeater in the chain. This repeater places its outbound audio in its designated time slot (digitized at 64 kbh). Successive repeaters in the chain add their digitized audio streams in their designated time slots and propagate the frame. The same type of audio transfer occurs in the right-to-left travelling frame.

For communication between two repeaters, A and 8, each would transmit audio in its designated time slot travelling in opposite directions. Reception would OCCUT with repeater A recovering time slot B, and repeater B recovering time slot A. With this inven- tion, N/2 pairs or repeaters can comm...