Infrasonic Frequency

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Infrasonic Frequency

</dt>
A frequency below the audiofrequency range. </dd>
The word infrasonic may be used as a modifier to indicate a device or system intended to operate at an infrasonic frequency. The term subsonic was once used in acoustics synonymously with infrasonic; such usage is now discourages. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use