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Consumer Electronics by S. P. Bali

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PUBLIC ADDRESS SYSTEMS

A public address (PA) system consists basically of a microphone, amplifier and speaker(s) to facilitate the communication of intelligible speech to groups of people. Coverage of large groups may be the chief purpose of providing communication over outdoor areas or of providing sound reinforcement indoors with sufficient fidelity so that the sound system is unobtrusive.

Acoustic problems differ considerably for outdoor and for indoor installations. Directional horns, Fig 26.11, are often employed in outdoor systems to concentrate sound energy efficiently over the areas served. Intelligibility is the usual performance criterion and the system frequency response is typically limited to a range of300 Hz to 5,000 Hz. Intelligibility ...

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