The paper reviews the early uses of microprocessors to control signal routing, input selection, and zone selection in building paging systems; and the early uses of computers with video displays to control signal-delay selection, loudspeaker selection and levels, signal routing, and power amplifier monitoring in sound-reinforcement systems for arenas, stadiums, and convention centers.
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https://aes2.org/publications/elibrary-page/?id=6230
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