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Browse Prior Art Database

SIMULCAST SYSTEM USING TRANSLATED AUDIO

IP.com Disclosure Number: IPCOM000007749D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-18
Document File: 1 page(s) / 67K

Publishing Venue

Motorola

Related People

Chris Wilson: AUTHOR

Abstract

Expensive, special transport equipment is needed to carry a composite analog signal consisting of voice and sub-audible signaling from the prime site of a simulcast system to the remote site of the simulcast system. The portion of the audio band spectrum (within the transport equipment), which is carrying the sub-audible signaling modulation, must be gain stable and with a repeatable amplitude response. The simulcast repeater also has same gain and ampli- tude response constraints. These constraints, stable and accurate frequency response below 5 Hz, place performance requirements on the system that are difficult to maintain and measure. Most audio measurement equipment is not accurate at these frequencies.

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M-LA Technical Developments

8

SIMULCAST SYSTEM USING TRANSLATED AUDIO

by Chris Wilson

BACKGROUND

would lower the cost ofthe system.

SOLUTION

  Expensive, special transport equipment is needed to carry a composite analog signal consisting of voice and sub-audible signaling from the prime site of a simulcast system to the remote site of the simulcast system. The portion of the audio band spectrum (within the transport equipment), which is carrying the sub-audible signaling modulation, must be gain stable and with a repeatable amplitude response. The simulcast repeater also has same gain and ampli- tude response constraints. These constraints, stable and accurate frequency response below 5 Hz, place performance requirements on the system that are difficult to maintain and measure. Most audio measurement equipment is not accurate at these frequencies.

  These performance constraints currently require the use of special, proprietary equipment which pro- vides a solution but at high cost. The problem is the low end frequency response constraints. If these con- straints were removed, then the low end frequency response required for the transport equipment could be removed. Equipment with standard frequency response (300 to 34000 Hz) could then be used which

  The low end frequency response constraint can be removed from the transport equipment by up-translating the composite modulation signal before it is sent to the transport equipment and simul- cast repeater. A block diagr...