Ultrasonic: frequencies above 20,000 Hz.
Infrasonic: frequencies below 20 Hz.
Body, Mind and Voice, Leon Thurman, Ed & Graham Welch, PhD,co-editors.
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February 2010Ultrasonic: frequencies above 20,000 Hz. Body, Mind and Voice, Leon Thurman, Ed & Graham Welch, PhD,co-editors. Comments are closed. |
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