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Sound System Engineering 4e, 4th Edition by Don Davis, Eugene Patronis, Pat Brown

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Chapter 21

Signal Delay and Signal Synchronization

by Don Davis

21.1  Signal Delay

What Is Time?

Why Signal Delay?

Definitions

Useful Values to Keep in Mind

21.2  Useful Signal Delay Equations

Temperature Effect on the Speed of Sound

Time

Travel Equations

Conventional Distance, Velocity, and Time Equations

Delay

A More Accurate Velocity Equation

Finding the Velocity of Sound with an Analyzer

The Henry, Fay-Hall, Haas Effect

A Typical Case

Setting Signal Delay

Signal Synchronization, Alignment and Convergence Defined

21.3  Synchronization and Alignment of Arrays

The High-Frequency Units

21.4  Finding Acoustic Origins of Unlike Devices

A Church Loudspeaker Missynchronization

Removal of the Reflected Energy

Polar Response

21.5  Conclusion

Bibliography ...

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